Soliditycông việc

...viết code bằng ngôn ngữ lập trình Sodility. 3. Có hiểu biết và kinh nghiệm trong phương thức lập trình TDD (Test-Driven Development) 4. Có hiểu biết rộng về công nghệ Blockchain, đặc biệt là Ethereum. 5. Quen thuộc với những lỗ hổng thông thường trong Hợp đồng thông minh (Smart Contract) ----------------------------- Yêu cầu: 1. Thiết kế, xây dựng ứng dụng phi tập trung bằng ngôn ngữ lập trình Solidity 2. Viết các tư liệu hướng dẫn liên quan và hỗ trợ kĩ thuật cho team. 3. Kiểm soát chất lượng và các lỗ hổng bảo mật, các đoạn mã code trong hợp đồng thông minh. 4. Tìm kiếm, nghiên cứu các giao thức sử dụng...

Need dev has experience on developing smart contracts in Solidity. Location HCM city, VN.

...token implementations and protocol-level logic. Our focus is security, clarity, and real-world usability — not hype. We are building a long-term freelancer pool and looking for engineers who can deliver clean, well-structured Solidity code independently. What You’ll Do Design and implement secure smart contracts using Solidity Work with EVM-compatible chains Review and improve existing smart contract code Follow best practices for documentation, testing, and security Collaborate asynchronously with a small technical team Required Skills Strong experience with Solidity and the EVM Ability to architect and deploy production-ready smart contracts High attention to detail and security Ability to write clean, readable, well-documented code Comfor...

Need a Solidity dev for a simple MVP: team-based NFT positions + monthly oracle update + reward claim. Contracts only (no frontend). Stack: Solidity + OpenZeppelin + Foundry. Must include tests, deployment script, and clean documentation.

I need a brand-new ERC-20 smart contract built from scratch, then deployed to the Ethereum network. The token must include minting, burning, and pausable functionality, implemented with clean, upgrade-friendly Solidity code that follows current best practices (OpenZeppelin libraries, Hardhat or Foundry for testing). Please create, test, and deploy the contract, then hand over everything required for future maintenance. Deliverables • Verified Solidity source code with mint, burn, and pause modules • Full test suite covering core logic and edge cases • Deployment scripts and step-by-step notes (addresses, gas used, etherscan verification) • Final token address on Ethereum mainnet or a clearly documented test deployment if mainnet is postponed Accep...

...to validate technical depth, architecture thinking, and clean execution. Scope (1-Hour Deliverable) One of the following (or similar complexity): - Build a minimal FastAPI endpoint with proper validation and auth stub - Implement a small OpenAI-powered endpoint (structured output, clean prompt design) - Create a basic RAG-style retrieval flow with mock data - Deploy a simple smart contract (Solidity or Rust) with clear structure - Wire a React/ frontend to a clean backend endpoint Requirements - Clean, modular code - Secure implementation (input validation, edge cases handled) - Clear structure and comments where needed - Production mindset, not hacky scripts - Fast communication and decisive execution What We Value - Ownership and low coordination overhead - Pragmatic engine...

...token implementations and protocol-level logic. Our focus is security, clarity, and real-world usability — not hype. We are building a long-term freelancer pool and looking for engineers who can deliver clean, well-structured Solidity code independently. What You’ll Do Design and implement secure smart contracts using Solidity Work with EVM-compatible chains Review and improve existing smart contract code Follow best practices for documentation, testing, and security Collaborate asynchronously with a small technical team Required Skills Strong experience with Solidity and the EVM Ability to architect and deploy production-ready smart contracts High attention to detail and security Ability to write clean, readable, well-documented code Comfor...

...platform, CritiQ, needs a suite of robust, reusable smart contracts. I already have the product vision, tokenomics draft, and high-level user flows; now I’m ready to turn that vision into audited code. Here’s what I expect from this engagement: • Architecture & specification – refine requirements with me and translate them into a concise technical spec. • Development – implement the contracts in Solidity using best-practice libraries such as OpenZeppelin, with comprehensive unit tests in Hardhat or Truffle. • Security & gas optimisation – apply industry-standard patterns, write clear modifiers, and run automated analysis (Slither, MythX, or similar) before handing the code over for an external audit. • Deployment &...

I have an almost–finished Web3 application running on BNB Smart Chain and need an experienced engineer to wrap up the last mile. The heavy lifting is on the contract side, but a clean hand-in demands tight coupling with the existing React/TypeScript frontend. What still needs doing • Write production-ready smart contracts for a referral & level system, staking and vesting mechanics, a level-gated NFT mint, and the accompanying ATA utility token. • Deploy, test, and wire those contracts into the current codebase through Wagmi / connectors. • Guarantee seamless Metamask, WalletConnect, and Trust Wallet interaction, including clear transaction states and error handling. • Close out a handful of UI bugs, polish the UX, and verify that every on-chain

I have an almost–finished Web3 application running on BNB Smart Chain and need an experienced engineer to wrap up the last mile. The heavy lifting is on the contract side, but a clean hand-in demands tight coupling with the existing React/TypeScript frontend. What still needs doing • Write production-ready smart contracts for a referral & level system, staking and vesting mechanics, a level-gated NFT mint, and the accompanying ATA utility token. • Deploy, test, and wire those contracts into the current codebase through Wagmi / connectors. • Guarantee seamless Metamask, WalletConnect, and Trust Wallet interaction, including clear transaction states and error handling. • Close out a handful of UI bugs, polish the UX, and verify that every on-chain

...experienced blockchain developer to guide and build the entire solution with me. Because the project is still early-stage, I’m open on the specific chain, tech stack, and even the exact feature set—we’ll define those details together during an initial discovery call. What I do know is that the end product will rely on smart contracts, a dApp front end, and secure wallet interaction, so familiarity with Solidity or similar contract languages, , and modern front-end frameworks is essential. Here’s how I’d like to structure our collaboration: – First, a short technical workshop where you assess my concept, recommend an appropriate blockchain (Ethereum, BSC, Polkadot, or another you feel fits), outline the contract architecture, and flag any c...

I’m preparing to launch a brand-new BEP-20 asset on the BNB Smart Chain that mirrors the technical discipline of USDT while remaining an entirely separate token. Here’s what I need from you: • A clean, audited-style smart contract written in Solidity that compiles under the latest stable version, adheres strictly to the BEP-20 interface, and defaults to 18 decimals. • Flexible placeholders for the name, symbol and total supply; I will confirm those values right before deployment. • Owner-controlled mint and burn functions so I can expand or contract supply as required. • A blacklist / whitelist mechanism to freeze or allow specific addresses when necessary. (Transfer-pause logic is nice to have, so feel free to wire it in behind a boolean fla...

... yet go beyond the basics by including three essential capabilities: easy transferability, an on-chain dividend-distribution function that lets me send BNB or BUSD to current holders, and a burn mechanism I alone can trigger when underlying gold is redeemed. Please write clean, well-commented Solidity, test it thoroughly with Hardhat or Truffle, and deploy first to the BSC testnet; after I confirm everything works, walk me through the mainnet deployment. Deliverables 1. Auditable BEP-721 Solidity contract with transferability, dividend payments, and burn controls implemented. 2. Unit tests proving each feature works end-to-end on the testnet. 3. Step-by-step deployment guide plus ownership-transfer instructions. 4. A concise README for future maintenance. The jo...

...basic AML heuristics), and then notifies the merchant’s backend via webhook or GraphQL subscription. Successful transactions should settle directly to the merchant’s wallet; failed or flagged payments must trigger a callback we can act on. I’m comfortable on the product side but need a Solidity/Web3 engineer who can deliver production-ready code, a lightweight Node.js or Python service that talks to the chain, and a small front-end demo so merchants can see it working end-to-end. Deliverables: • Audited Solidity smart contract(s) that handle consumer-to-business payments • Fraud-detection module integrated into the off-chain service • REST or GraphQL API with webhook callbacks for payment status • Minimal front-end demo and cle...

I am building a service that must accept one-time customer payments directly on a public blockchain. My preferred rail is Ethereum, so the core of the job is a production-ready smart-contract–plus–API stack that lets me generate unique payment addresses, confirm the transfer, and surface the confirmation back to my app in real time. Here’s what I need the finished package to do: • Solidity smart contract deployed on Ethereum mainnet (initially Kovan/Goerli for testing) that logs each payment, enforces one-time use, and emits an event my backend can listen to. • Lightweight Web3 interface or RESTful webhook that notifies my server once a transaction reaches a configurable confirmation depth. • Simple front-end snippet (HTML/JS) that shows the cli...

...whichever stack its engineers prefer. • Attack coverage baked into the dataset pipeline: the IDS must correctly classify Malware, Phishing, and DDoS patterns. Synthetic generation for edge cases is fine as long as the final validation shows clear detection rates for all three. • Smart-contract aggregator: the chain’s sole responsibility is aggregating model weights. I want a concise contract—Solidity for an Ethereum PoA test-network or chaincode for Hyperledger Fabric—that stores submissions, computes the federated average, and emits the new global state. No on-chain data other than floats and a small hash for versioning. • bridge: a lightweight Python client that listens for the latest global weights, injects them back into the local model, a...

Digital Chain of Custody for Forensic Evidence ​Concept: A system for police and legal teams to track digital evidence (logs, hard drive images, CCTV footage) without tampering. ​The Problem: In court, digital evidence is often dismissed because the defense claims it was tampered with after seizure. ​The Solution: When evidence is collected, a cryptographic hash (SHA-256) of the fil...out" or viewed by an officer, a transaction is recorded. If the file hash changes even by one bit, the Blockchain rejects it. ​Tech Stack: ​Frontend: React.js or Flutter. ​Blockchain: Ethereum (Sepolia Testnet) or Hyperledger Fabric (for private permissioned access). ​Storage: IPFS (InterPlanetary File System) to store the actual large files; Blockchain only stores the hash. ​Smart Contracts: Solidity...

... and IoT engineering. First, the AI-driven Smart Traffic System must ingest multi-sensor feeds, apply real-time reinforcement learning, and demonstrate measurable gains in a simulation such as SUMO—specifically a double-digit reduction in congestion and wait times across a 20-intersection grid. Second, the Blockchain Voting System needs an end-to-end verifiable ballot flow. I expect audited Solidity or Substrate contracts, mobile-friendly front-end, zero-knowledge vote secrecy, and a testnet demo with at least fifty dummy voters that passes a public audit script. Third, the Solar-Powered Smart Watering System will run on a low-power microcontroller (ESP32/Arduino acceptable), read soil and weather data, and autonomously schedule irrigation while managing a small photovol...

...quality our clients value most. Think of the quiet confidence you feel when you see brands such as SBI or HDFC; that same sense of stability, growth and reliability should come through here, only tailored to our own identity. The logo will be a combination mark: clean lettering for “DR Enterprises” paired with a subtle, memorable icon. I see squared or rectangular forms working well to communicate solidity, but I’m open to how you integrate them. Colour-wise, please explore refined blends of red, orange, yellow and pale green set against an ivory backdrop; I’d love to hear your reasoning on the exact palette you choose. What I expect from you: • 4-5 distinct concept directions (vector-based, created in Adobe Illustrator or equivalent) • Room ...

...logic and security best practices. • Build or integrate a Web3-enabled interface (React, Vue, or similar) so users can interact seamlessly. • Handle testnet deployment, iterative QA, and finally mainnet release, including clear documentation so I can maintain the codebase after hand-off. I’m open to your technical preferences as long as the stack fits smoothly with Binance Smart Chain (Solidity, Hardhat/Truffle, , MetaMask support, etc.). If you have examples of previous BSC projects, especially live DApps, please include them—seeing how you solved real-world challenges will help us hit the ground running. Timeline and milestones are flexible; what matters most is clean code, thorough testing, and a straightforward user experience. Let me know how ...

...metadata, and mints it as an NFT on Ethereum. The resulting token must permanently prove ownership, allow normal transfers, and embed a royalty mechanism. Alongside the minting process, I want a language model to process the same material—extract keywords, generate a concise summary, possibly produce embeddings—and write those insights back into the token’s metadata or a linked JSON file. Think Solidity (ERC-721 or ERC-1155 with OpenZeppelin), IPFS or Arweave for storage, plus a Python or Node script that calls GPT-4 / Llama via LangChain or similar. This person must also be familiar with setting up a blockchain and wallets. Specifically using AWS to start, but flexible on learing. Deliverables • Hyperledger smart contract with ownership, transferabil...

We are a Web3-focused product team building a modern, scalable NFT Marketplace on Polygon/Ethereum. Our goal is to transform an existing NFT marketplace into a production-ready, secure, and user-friendly platform using modern Web3 standards. The project already has: A working NFT Marketplace Smart contracts (Solidity) A + Tailwind frontend We are now entering the modernization phase to upgrade architecture, security, UX, and performance.

...metadata, and mints it as an NFT on Ethereum. The resulting token must permanently prove ownership, allow normal transfers, and embed a royalty mechanism. Alongside the minting process, I want a language model to process the same material—extract keywords, generate a concise summary, possibly produce embeddings—and write those insights back into the token’s metadata or a linked JSON file. Think Solidity (ERC-721 or ERC-1155 with OpenZeppelin), IPFS or Arweave for storage, plus a Python or Node script that calls GPT-4 / Llama via LangChain or similar. This person must also be familiar with setting up a blockchain and wallets. Specifically using AWS to start, but flexible on learing. Deliverables • Hyperledger smart contract with ownership, transferabil...

...workflows integrated with blockchain, backend, AI, and payments. • Backend automation triggered by blockchain events. • REST APIs with documentation. • AI model integration. • Payment gateway fully integrated. • Clean, production-ready source code. • Short technical documentation explaining system architecture and automation flows. ⸻ Skills Required • Blockchain Development (Ethereum, Solidity, Smart Contracts) • Web3 Integration (, ) • Automation & Workflow Orchestration (n8n) • Full-Stack Development (React.js, Node.js, , PHP, Laravel, Django) • Mobile App Development (Flutter) • AI Model Integration • API Development & Integration • Backend Development (Node.js, Python, Laravel) &bul...

...need an experienced Solidity developer to write, test, and deploy the core smart contract that will power the dApp. The contract must follow best practices for security and gas-efficiency and be ready for mainnet once we complete testing. You’ll start by defining the contract architecture with me, then move on to clean, well-commented Solidity code. I prefer a modern workflow—Hardhat or Truffle for compilation and testing, plus or for interaction scripts—but I’m open to alternatives if you have a strong preference. Unit tests that reach full branch coverage are essential, along with a brief technical write-up explaining the contract logic, deployment steps, and any upgrade or governance considerations. Deliverable • Audited, production-re...

...and include native token staking so holders can lock tokens and earn rewards. Key expectations • Develop and audit the BEP-20 smart contract with staking logic built in. • Configure total supply at exactly 100,000 tokens and deploy first on a BSC testnet, then on mainnet once we confirm functionality. • Provide clear deployment instructions, the verified contract address, and source code (Solidity). • Supply a brief README that explains how to initiate staking, unstake, and claim rewards through common wallets such as MetaMask or Trust Wallet. Nice to have but not mandatory • A lightweight web page or script that lets users stake and track rewards. • Guidance on adding the token to PancakeSwap. I will test the contract myself and will rele...

...project / Budget negotiable) Project Details: I am building my own blockchain called “EGoldChain” (an EVM-compatible fork derived from BSC/Polygon). I want to develop a domain name registration system similar to ENS (Ethereum Name Service), using the .gold suffix. Example: If a user registers the name nova, the system will generate as an NFT. --- Scope of Work Part 1: Smart Contract (Solidity) Deploy on EGoldChain (I will provide the RPC URL). 1. Core System: • Write contracts based on the ERC-721 (NFT) standard. • 1 domain name = 1 NFT. • Suffix: must always end with .gold. 1. Functions: • Register: Register new names (payment accepted in USDT, and USX in the future). • Renew: Extend domain registration (pricing based on number ...

...project / Budget negotiable) Project Details: I am building my own blockchain called “EGoldChain” (an EVM-compatible fork derived from BSC/Polygon). I want to develop a domain name registration system similar to ENS (Ethereum Name Service), using the .gold suffix. Example: If a user registers the name nova, the system will generate as an NFT. --- Scope of Work Part 1: Smart Contract (Solidity) Deploy on EGoldChain (I will provide the RPC URL). 1. Core System: • Write contracts based on the ERC-721 (NFT) standard. • 1 domain name = 1 NFT. • Suffix: must always end with .gold. 1. Functions: • Register: Register new names (payment accepted in USDT, and USX in the future). • Renew: Extend domain registration (pricing based on number ...

...events. • REST APIs with documentation. • AI model integration and data-driven functionality. • Payment Gateway integrated within the platform. • Clean, production-ready source code. • Short technical documentation explaining system architecture. -------------------------------------------------------------------------------------------- Skills Required • Blockchain Development (Ethereum, Solidity, Smart Contracts) • Web3 Integration (, ) • Full-Stack Development (React.js, Node.js, , PHP, Laravel, Django) • Mobile App Development (Flutter) • AI Model Integration • API Development & Integration • Backend Development (Node.js, Python, Laravel) • Frontend Development (React.js, JavaScript) • D...

...gateway, the transaction is written on-chain, and I receive an instantly checkable hash I can surface back to the user. Performance must remain within normal web-app latency, and the code needs to be clean enough for a future audit. When you reply, focus on the secure-transaction gateways you’ve built or maintained, any chains or libraries you know inside out (, , Hardhat, Truffle, Solidity, Golang, Rust, Hyperledger Fabric, etc.), and the challenges you solved around confirmations, gas optimisation, or key management. A concise outline of how you would approach this build will help me see whether your experience aligns with the project. Deliverables • Technical design and chain selection rationale • Smart contract or ledger code (if used) with tests • ...

I’m looking for someone who already understands the MEV game inside out and can turn that knowledge into a live, revenue-producing system. The scope spans both Ethereum and Solana, so you’ll be juggling Solidity, Rust, Flashbots, and Solana’s priority-fee mechanics in one coherent architecture. Core objectives • A single MEV bot that watches the mempool in real time, identifies opportunities, and automatically executes profitable front-running, arbitrage trading, and sandwich attacks. • On-chain components written in Solidity (for Ethereum) and Rust/Anchor (for Solana) that the bot can call to secure transactions, bundle them, and protect against re-ordering. • Robust monitoring, risk controls, and simple configuration so we can turn in...

...todas as funcionalidades de governança, compliance e listagem pré-configuradas. Requisitos Técnicos Obrigatórios 1. Blockchain Base - Utilizar Polygon PoS ou Polygon zkEVM (prioridade: zkEVM se viável). - Motivo: baixo custo, alta compatibilidade com Ethereum, suporte a exchanges e ferramentas de auditoria. 2. Smart Contract (ERC-20 Privado) O contrato inteligente deve ser desenvolvido em Solidity ≥0.8.20, usando OpenZeppelin Contracts como base, e conter: Funcionalidades obrigatórias: - Pausabilidade (`Pausable` + função `pause()`/`unpause()` restrita ao owner) - Whitelist (somente endereços autorizados podem transferir/comprar) - Minting controlado (apenas roles com permissão) - Supply total confi...

This task involves fixing a bug where blockchain transaction data is not displaying correctly on the web interface. The issue occurs after transactions are successfully recorded on the blockchain but fail to update on the UI. The fix will focus only on correcting the data fetch or rendering logic. No new features or redesigns are required. The work includes testing the fix to ensure transa...are successfully recorded on the blockchain but fail to update on the UI. The fix will focus only on correcting the data fetch or rendering logic. No new features or redesigns are required. The work includes testing the fix to ensure transactions display correctly after submission. Skills: JavaScript, React.js, Python, PHP, Artificial Intelligence, Typescript, Blockchain, Web Development, Rust, So...

...AirDrop coins for successful transactions, secure packaging, and uninterrupted delivery. Royalties: Automated royalty payments to Brands from every secondary sale. Technical Requirements (Note: Specific framework preferences like React or Node.js are not mentioned in the sources and should be verified based on your existing infrastructure preferences.) Smart Contract Development: Proficiency in Solidity (or similar) to handle NFT minting, ownership transfers, and royalty distributions. Web3 Integration: Experience connecting front-end interfaces with blockchain wallets and decentralized protocols. IoT/RFID Integration: Capability to develop or integrate systems that link physical RFID data to the digital ledger. E-commerce Backend: Robust architecture to handle high-value...

I’m about to launch an Ethereum-based DApp with its own native token and I need a thorough third-party review before we touch mainnet. The Solidity code is functionally complete; my primary concern is rooting out security vulnerabilities, then tightening optimisation and style where it makes sense. What I need from you • A full manual + automated security audit of all smart contracts using tools such as MythX, Slither, Echidna, or your preferred stack, followed by line-by-line human review for logic flaws. • A clear report that ranks every issue by severity, explains the exploit path, and supplies concrete, actionable fixes (bonus points for proof-of-concept tests). • Verification that the token contract complies with ERC-20: supply cap, mint/burn control...

...global leaderboard. All of this must feel instantaneous on mobile networks, so low-latency APIs and efficient data caching are crucial. Core tasks • Design and implement the API that serves puzzle data, records attempts, and manages leaderboards. • Write or integrate a puzzle generator that can produce endless logic puzzles of increasing difficulty. • Build and test the smart-contract layer (Solidity or similar) that handles badge minting and any token logic. • Connect the contract to the backend through so results are committed on-chain only when puzzles are successfully solved. • Set up secure wallet auth (WalletConnect or similar) and user-profile storage. • Provide clear documentation and Postman collections so my front-end team can...

...syncs from genesis on at least two clean servers. 2. Mining a block with the supplied software is demonstrably feasible in under five minutes on commodity hardware. 3. The explorer displays live block, transaction and address data. 4. All documentation allows a technically literate user to reproduce the entire setup without further assistance. If you’ve worked with Ethereum forks, Geth, Solidity and GPU mining before, this should feel familiar. I’m happy to iterate on tokenomics and branding as we move, but the core technical pieces above are the first milestone....

...hiring (It is a historical manifesto). • Allocate initial supply to the Treasury/Reserve wallets as specified. 2. Node Setup & Deployment: • Set up the initial Bootnodes and Validator Nodes. • Ensure the network achieves consensus (PoS/PoA) and produces blocks stably. • Connect the network to a basic RPC endpoint for connectivity. 3. Compatibility: • Ensure full EVM Compatibility (must support Solidity smart contracts, Metamask connection, etc.). • Experience with Geth (Go-Ethereum), Erigon, or Hyperledger Besu forks is highly preferred. 4. Documentation: • Provide clear documentation on how to run a node and connect to the network. Requirements: • Proven experience in launching Layer-1 blockchains or forking EVM chains (Portfolio requi...

Project Title: Blockchain Developer for Private TRC-20 Toke...On-Chain Validation: The token must be transferable on the Mainnet/Testnet with standard blockchain confirmations. 5. Automated Distribution: Set up a system for automated token transfers to designated receiving wallets upon trigger. 6. Longevity: The smart contract must remain active and the tokens must maintain state for a minimum of 90 days. Candidate Requirements: - Deep understanding of Solidity and TRON's Resource Model (Energy/Bandwidth). - Extensive experience with TronWeb and TronGrid. - Proven background in creating crypto tokens or custom blockchain solutions (please share portfolio or past work related to crypto tokens). This detailed scope will help you connect with freelancers specializing in blockcha...

...minimum 90 days 9. Optional minting/burning logic (admin-controlled, if required) 10. Clean, optimized, and well-documented smart contract code --- Compliance & Transparency (Important) * Token will use a new and original contract address * No impersonation of real USDT * No misleading explorer behavior * Clear distinction from official USDT --- Preferred Skills * TRON / TRC20 development * Solidity * TronWeb * Smart contract security best practices * Experience with Tronscan verification * Mainnet deployment experience --- To Apply, Please Share * Previous TRON/TRC20 projects * Smart contract samples or GitHub * Estimated cost & delivery timeline * Security approach (reentrancy, access control, etc.) --- Bonus (Optional) * Admin dashboard for mint/burn * R...

I’m building a browser-based Web3 gaming dApp and need a production-ready frontend written entirely with HTMX (and any companion libraries you normally pair with it, such as hyperscript or , if helpful). Solidity contracts and back-end APIs are already covered; your role is to craft the interactive layer that players will actually see and feel. Core gameplay revolves around multiplayer sessions, in-game purchases, a global leaderboard with achievements, rich social features (chat, friends/buddies lists, quick invites), and a dedicated poker room. Every screen—from lobby to live table—must load fast, degrade gracefully without JavaScript bloat, and interact seamlessly with on-chain calls (wallet connect, signature pop-ups, token approvals, etc.). What I expect you...

...order book, only the underlying asset is the sports outcome. • Odds and price movement must update live, so real-time data streams are essential. • Smart contracts handle escrow, settlement, and payouts on-chain; I’ll provide initial contract outlines, but I’m open to your best practices for security and gas efficiency. Key tech expectations React, , Node.js, or , Solidity for contract tweaks, plus any charting library you prefer for the live trading view. If you’ve shipped a DeFi or betting dApp before, you’ll feel right at home. Deliverables 1. Fully functional web app with wallet connect, trading UI, and sports-bet settlement on a testnet. 2. Well-commented, deploy-ready smart contracts. 3. Basic admin panel or scripts for listing n...

...proposition is radical transparency. Every contribution must be recorded on-chain in real time, and visitors should be able to verify where each token ends up without needing to trust a spreadsheet or a PDF report. I want this built from scratch in a clean VS Code workflow, so you are free to choose the stack that best supports smart-contract interaction (React or on the front end, Solidity or similar for the contracts, Node/TypeScript on the API layer—whatever you are most comfortable shipping and maintaining). The key is that the codebase remains fully open, readable, and ready for future audits. What matters most to me is proof that you have done this before. Point me to past work that shows live, working transparency dashboards or smart-contract-driven fundraisin...

...contract itself • Testing and debugging every function • Deploying the finished token to the network Parts of the codebase are there, parts are not; so expect to review what’s committed, refine or rewrite where needed, and then push clean, tested code back to the repo through standard pull-request flow. Blastpad integrates smoothly with typical EVM workflows, so if your toolkit includes Solidity, Hardhat or Foundry along with JavaScript/Python scripting for tests, you’ll feel at home. You’re free to recommend improvements to the current structure so long as everything remains version-controlled in GitHub and passes automated tests before merge. Deliverables 1. Final smart-contract code committed to the existing repository. 2. Comprehensive uni...

We’re a VC-backed Web3 scale-up participating in the UK Digital Securities Sandbox alongside the Bank of England, the FCA and HMT. Our next milestone is to ship production-grade sma...(Hardhat or Foundry), on-chain deployment and post-deployment verification. • Hand over clean documentation and a minimal example dApp that demonstrates every contract function. Acceptance criteria: contracts compile without warnings, achieve 90 %+ test coverage, pass static analysis (Slither, MythX or similar) and deploy successfully to BNB Chain testnet and mainnet. If you’ve previously shipped Solidity on BNB Chain, understand cross-chain nuances, and can work in an agile GitHub workflow with CI, let’s talk. *Payment will be in digital assets from the smart contract we&rs...

Project Title: Consultation for Token Launch & DApp Deployment (Ethereum Mainnet) Description: I am preparing to launch a new token and a decentralized application (DApp) on th...smart contracts and DApp are optimized for gas fees and scalability. Security & Best Practices: Advise on security measures and best practices for contract development, token distribution, and user interactions. If you have experience with Ethereum-based projects, smart contract audits, and DApp development, I would love to hear from you. Skills Required: Smart Contract Development & Auditing Solidity Ethereum Development Tokenomics / Frontend Integration (React, Web3 frontend) Looking forward to collaborating with an expert who can help make sure everything is in top shape before l...

...deployment of a custom token (smart contract creation, mint/burn, liquidity pool mechanics). Preparation for GemPad presale launch. Assistance with KYC & auditing processes (already arranged, but must liaise and ensure smooth integration). Coordination with marketing team to ensure visibility, investor confidence, and successful presale. Requirements: Strong experience in smart contract development (Solidity / Binance Smart Chain preferred). Previous work on presale launches (GemPad, PinkSale, or similar platforms). Knowledge of liquidity management, anti-bot measures, and tokenomics setup. Must be able to work collaboratively with auditors and marketing teams. Clear communication and ability to deliver within agreed timelines. Deliverables: Token smart contract (secure, aud...

...the standard (ERC-20); what I’m looking for now is your technical expertise and strategic insight to make sure the token is secure, gas-efficient, and positioned for growth. Here’s what I’ll need from you: • A concise tokenomics model that spells out supply, distribution, vesting and any fee logic, with clear reasoning behind each figure. • A well-audited, upgradable smart contract written in Solidity that reflects those economics, follows best practices (OpenZeppelin libraries, SafeMath where relevant) and passes standard security checks. • Deployment to the Polygon mainnet and a short hand-off guide covering contract address, ownership keys, and how to verify the code on Polygonscan. If you can also advise on optional extras—such a...

Experienced Solidity Developer (Part-Time Teaching Role – 3 Hours, Global Web3 Bootcamp) About the Project: We are Borderless Coding, a global tech education company helping developers transition into international blockchain and Web3 careers. Check out our bootcamp: We’re launching a new Solidity module in our Web3 Global Developer Bootcamp and looking for an experienced Solidity developer to teach a practical, project-based component focused on real-world dApp integration development. Your Role: As the Solidity Instructor, you’ll: Teach a 3-hour program for intermediate Web3 developers. Guide students through: - Solidity Interfaces - Send ETH from a contract - Token Standards - ERC-20, ERC-721, ERC-1155 - Bridges and cross-chain mes...

...withdrawal through a smart contract we can audit together. The work covers three functional pillars: wallet management, transaction processing, and precise fee calculation. Because everything rides on trust, I need solid best-practice security baked in from the start—strong data encryption, airtight user authentication, and verifiable transaction integrity. Deliverables I expect – Smart contract (Solidity or comparable) handling the fee split and transfer logic – Backend logic that plugs into my existing app to trigger the contract, confirm success, and update balances – Clear, human-readable documentation of the contract, API endpoints, and security measures – A brief hand-off session so I’m confident deploying it to mainnet when rea...