Dual-Platform Crypto Wallet & Card

@corpmember29

Hello, I HAVE COMPLETED SIMILAR MOBILE APPS, SECURE FINANCIAL PLATFORMS, AND ADMIN PANELS, AND I CAN SHOW YOU RELEVANT WORK. I have carefully reviewed your requirements and understand that you need a secure crypto wallet for iOS and Android with wallet management, exchange, fiat purchases, and a card linked directly to the wallet balance. I can develop the mobile apps, secure backend, wallet functionality, biometric authentication, encrypted local storage, send/receive, fee calculation, exchange integration, fiat on-ramp, and the card module with balance, authorisations, and transaction history. I can also build the admin dashboard for KYC, card activation, limits, and user support. Security will be a key focus throughout development, including secure key handling, authentication, transaction validation, encrypted data, and proper separation of wallet and card services. I can also integrate your existing card-issuing partner and work with their APIs and requirements. I have 13+ years of experience in mobile and full-stack development, API integrations, secure applications, payment systems, and cloud-based platforms. I can take the project from development through testing, integration, deployment, and handover. I WILL PROVIDE 2 YEARS OF FREE ONGOING SUPPORT AND COMPLETE SOURCE CODE. WE WILL WORK WITH AGILE METHODOLOGY AND WILL ASSIST YOU FROM START TO SUCCESSFUL PROJECT DELIVERY. Thanks, Christina

@C0RETECHIES

Hello, I understand you're building a dual-platform crypto wallet where users not only manage assets but can spend their balance via a linked payment card. Operationally, when a card transaction occurs, your backend will receive an authorization request from the issuer, perform a real-time check and hold on the user's crypto balance, confirm the transaction, and liquidate the necessary assets, all while the app shows a unified transaction history. Technical approach: A secure Spring Boot backend API with a PostgreSQL database. We'd use Flutter for a single, performant codebase on iOS and Android. On-device key management will leverage native Keychain/Keystore. Integrations will include your card issuer's API, a fiat on-ramp like Stripe, and a liquidity aggregator API for swaps. Core modules: A non-custodial wallet with client-side transaction signing. A real-time swap engine fetching quotes from a liquidity provider. A card linkage service to sync balances and handle authorization webhooks. An admin dashboard for KYC processing, card lifecycle management, and setting user limits. Relevant systems: We developed SecureCom, a communication app using military-grade 512-bit ECC encryption, proving our security expertise. We also built Bison360, a complex ERP with a Spring Boot backend, Flutter app, and multiple financial integrations (Stripe, Square). We would follow an MVP-first strategy, starting with the core wallet and backend. Next, we would integrate the fiat on-ramp, then the exchange, and finally the card functionality, allowing security audits at each stage. Regards, Rohit

@vladang

Card authorisation holds and wallet balances must stay consistent before the mobile UI is built around them. I’d start by confirming custody, supported chains, card-issuer APIs, and compliance flows, then define one ledger shared by transfers, swaps, fiat purchases, and card activity. The iOS/Android apps would use biometric access, encrypted local storage, real-time network fees, and a guided onboarding flow. The backend would handle KYC, limits, support controls, and testnet/mainnet configuration. The main integration risk is duplicate or out-of-order card webhooks. I’d use idempotent processing and model pending authorisations separately from settled transactions, so reversals and partial captures don’t corrupt spendable balances. Which card issuer are you working with, and can you share its API documentation and authorisation flow?

@DrSyafiq

For a Dual-Platform Crypto Wallet & Card, the key is not just the screens but keeping the API and platform-specific behavior stable across devices. I have handled similar systems where the important part was turning a broad brief into a reliable working version. My approach would be to first separate the real-time engine, wallet ledger, and admin controls, then prove latency and transaction safety before adding broader UI polish. For this project, I would focus especially on: - Real-time event flow, latency targets, and state synchronization - Wallet ledger, deposits/withdrawals, and audit-safe transaction handling - Admin controls, risk limits, monitoring, and secure deployment If helpful, I can sketch the real-time and wallet architecture I would validate first. Best, Dr. Syafiq

@ahmadayaz

I am excited about the prospect of partnering with you on developing a cutting-edge crypto wallet tied to payment cards. Your vision aligns perfectly with my expertise in creating robust and user-centric mobile solutions. To ensure success, I'd like to discuss: 1. User experience flow for card ordering and spending crypto at merchant terminals. 2. Compliance and regulatory requirements, especially concerning KYC and card activation. 3. Scalability considerations for potential user base growth and market demands. With a strong track record in secure mobile applications and integrating payment card functionalities, I am confident in delivering a quality solution that exceeds expectations and sets new standards in digital finance. Let's collaborate on this groundbreaking project together.

@pinkeegupta

Hi I will be able to help you. Please message me so that we will have detail technical discussion. I have 9+ years of combined experience in Mobile Application development, Website development, Desktop application development, 3rd party Artificial Intelligence api, AR/ VR, Chatbot, Blockchain- Cryptocurrency, CRM & ERP, Game Development and any other Software development. I am having expertise in Native on Android Java, kotlin and IOS Swift, and For Hybrid Cross platform on Flutter Dart & React- Native, and for web and backend on react js and node js, Python Django. Please consider me and initiate a chat for further detailed discussion. Regards, Anju

@TeamGTW

Hello! Based on your project description, you are looking to build a secure crypto wallet for iOS and Android that combines wallet management, crypto transfers, integrated exchange, fiat purchases, and a linked virtual or physical payment card. The platform will need secure key management, biometric authentication, encrypted storage, real-time fees, liquidity integration, KYC administration, card controls, transaction history, and reliable wallet-to-card balance synchronisation. I will focus on creating a secure cross-platform mobile experience with a hardened backend, encrypted key management, biometric access, blockchain integrations, third-party exchange and fiat on-ramp services, and card-issuer APIs. I will also build the admin dashboard for KYC, limits, card activation, transactions, and support while prioritising security testing, accurate transaction settlement, and App Store and Google Play readiness. I specialize in mobile, fintech, and backend development with 7+ years experience and I have done similar work in past please open the chat window so I can share with you. Thank you for considering my proposal. I look forward to hearing from you soon. Best regards, Nikita Gupta.

@toriquldev123

Hello There! I’m Md Toriqul Islam, an experienced mobile and full-stack developer specializing in secure fintech applications, cross-platform development, API integrations, payment systems, and scalable backend architecture. I understand you need a production-ready crypto wallet for iOS and Android with secure key management, token transfers, integrated exchange, fiat on-ramp, and virtual/physical card functionality linked to wallet balances. I can build the mobile apps, secure backend, card integration, and admin dashboard. I am skilled in Flutter/React Native, Node.js/Laravel, REST APIs, encrypted storage, biometric authentication, real-time transactions, third-party integrations, and cloud deployment. I’m ready to discuss your card-issuing partner and technical requirements, then define the architecture and development roadmap. Looking forward to hearing from you. Best regards, Md Toriqul Islam

@invoketech

Hi, I’m a strong fit for this project. I understand you need a secure iOS/Android crypto wallet with exchange, fiat on-ramp, and integrated virtual/physical card functionality backed by a secure API and admin dashboard. Key features: Crypto Wallet – Send / Receive Secure Key Management Biometric Authentication Encrypted Local Storage Token & Network Fee Integration In-App Crypto Exchange Fiat On-Ramp Virtual & Physical Card Integration Real-Time Card/Wallet Balance Sync Transaction History KYC & User Management Card Limits & Activation Admin Dashboard iOS & Android Deployment I can use Flutter for a scalable cross-platform app, with a secure backend and modular integrations for the liquidity provider, fiat gateway, and your existing card-issuing partner. Flow: KYC → Wallet Setup → Buy/Swap Crypto → Card Linking → Card Transaction → Real-Time Balance & History I have 10+ years of experience in mobile, backend/API development, payment integrations, and secure transaction-based platforms. Let’s chat and discuss your card issuer API, supported assets, and preferred exchange/on-ramp providers. Thanks, Invoke Tech

@mughiraaa

Hello, I have already completed similar crypto wallet and fintech projects involving mobile apps, secure APIs, transactions, exchange integrations, and scalable software solutions. I can quickly understand your requirements and deliver exactly what is needed across iOS, Android, backend, and the card integration. I can handle secure wallet and key management, biometric login, crypto transfers, exchange and fiat on ramp, KYC, and the card module with balance synchronization, authorizations, and transaction history. Do you already have the card issuing partner API and technical documentation available, or should I review the integration requirements with your partner first? I would be happy to review the architecture, share relevant experience, and schedule a quick meeting to discuss the project. I will share my portfolio in chat I look forward to hear from you. Thanks Best Regards, Mughira

@cliftonc20

Hello, this is really two systems that have to behave as one: a consumer wallet and a card-linked spending platform, and the hard part is not the UI but keeping ledger state, card authorizations, and on-chain settlement consistent under failure conditions. I’ve built several production systems where client apps, secure backends, and third-party transaction providers had to stay in sync under real operational load. In a project like this, I usually treat the wallet, exchange/on-ramp, card processor, and admin controls as separate domains with explicit reconciliation paths rather than one merged application flow. The closest relevant work in my background is Enterprise ProxyTool Client App for control-plane/data-plane separation and Dent-Cloud for production backend and admin architecture. Different domain, but similar architectural pressure around reliability, state sync, and operational tooling. I would typically design this around a canonical ledger service, isolated key-management boundaries, asynchronous settlement workers, and a reconciliation layer for card events, swaps, and fiat purchases. That is what keeps balances trustworthy when partner APIs lag or partially fail. This kind of platform has to be designed for auditability, app review constraints, and long-term production support, not just first release. If useful, I can sketch the wallet-card settlement architecture and identify the main failure paths before build-out. Clifton

@sanjana22kr

hello there , I can build your production-grade crypto wallet for iOS and Android, including secure wallet infrastructure, exchange, fiat on-ramp, and card integration. my approach would cover: iOS/Android app using Flutter or React Native Secure key management, biometric authentication, encrypted local storage Crypto send/receive with real-time network fees Third-party liquidity/exchange API integration Fiat on-ramp with card payments Virtual/physical card ordering and wallet balance synchronization Card authorization, limits, transactions, and history Secure backend and admin dashboard for KYC, card activation, limits, and support Comprehensive testing across testnet and mainnet environments Security-focused architecture and audit-ready code I understand that the critical part of this project is the wallet ,card ,transaction authorization flow, so I will design the backend and ledger carefully to ensure balances and settlements remain accurate and auditable. I can also work with your existing card-issuing partner and integrate their APIs/SDKs for card issuance, authorization, funding, and transaction data. If you have already shipped the card-issuing agreement/API documentation, we can review it first and provide a clear technical architecture and delivery plan. discuss the security and compliance requirements before development begins. thanks

@shubhi8982

With my extensive experience in mobile app development for both iOS and Android, I am confident that I can build a top-notch dual-platform crypto wallet and card for you. My skills using languages like Python, Node.js, Java, React Native, Flutter, and Ionic resonate well with your project requirements. I have a strong grasp on building secure key management systems, encrypted local storage, as well as biometric login- crucial elements in ensuring your user's privacy. Securing the listing of your app on App Store and Google Play is also something I'm well versed at. One of my notable strengths lies in successfully delivering end-to-end solutions for complex systems with smooth performance - as your project demands. The fact that you’ve already established a partnership for the payment card integration gives me confidence in delivering the mobile application, secure back-end, and card-wallet linkage with utmost finesse.

@SkillCrafts

Your vision for a dual-platform crypto wallet with integrated exchange and card functionality is precisely the kind of challenging, high-impact project my expertise is built for. I've successfully developed robust, secure financial applications with complex transaction flows and seamless third-party integrations, similar to the payment card element you've outlined. My experience with blockchain APIs and mobile development ensures a fluid user experience across both iOS and Android. My technical approach would leverage React Native for efficient cross-platform development, enabling faster iteration and a unified codebase. For the wallet backend, I'd propose a secure, scalable architecture using Node.js with a PostgreSQL database, incorporating industry-standard encryption protocols. Integration with your chosen card-issuing partner would be handled via their provided APIs, ensuring secure transaction processing and compliance. I'd implement a phased development plan, starting with core wallet features, followed by exchange functionality, and finally, the card integration. To ensure we're perfectly aligned, could you elaborate on the specific cryptocurrencies you intend to support initially for swaps and card spending? Also, what are your primary security concerns regarding user funds and transaction integrity? I’m eager to discuss how my technical proficiency can bring your innovative crypto wallet to life.

@Visharaa2024

Hello, I can develop your iOS and Android crypto wallet with secure key management, biometric access, multi-token transfers, integrated swaps, fiat on-ramp, card-wallet linkage, and a KYC dashboard. I recommend React Native for the mobile apps, a Python and Node.js backend, audited wallet infrastructure, and compliant third-party providers for liquidity, fiat purchases, blockchain monitoring, and card issuing. Security, transaction accuracy, regulatory compliance, and store approval will be addressed from the architecture stage. Before committing, please confirm: ✔️ Will the wallet be custodial, non-custodial, or hybrid? ✔️ Which countries, blockchains, tokens, and fiat currencies are required? ✔️ Who is your card-issuing partner, and is API documentation available? ✔️ Which entity manages KYC/AML, custody, and transaction monitoring? ✔️ Do you already have legal approval for the targeted regions? ✔️ What are your expected timeline and budget? Due to the financial and compliance scope, I suggest starting with a technical discovery phase covering provider APIs, security architecture, regulatory responsibilities, and a detailed feature matrix. Best regards, VD Infotech

@venplura

Hi there! Quick question - are you planning to support staking or yield features on held assets, or keeping it strictly to wallet, swap, and card spend functionality? Regardless, this is definitely something that I feel confident delivering on, given my past experience. I would love to discuss your project further! Looking forward hearing from you. kind regards, Corné

@aakaashberi

I will be straight rather than agreeable: what you have described - wallet, in-app exchange, fiat on-ramp, issued cards, KYC and an admin console - is not a $750-1,500 project. Anyone bidding the whole scope at this budget is either misreading it or will disappear at 60 percent. So my $750 buys Phase 1, and I will name exactly what that is: the wallet core on iOS and Android in Flutter - non-custodial key generation, seed backup, biometric unlock, encrypted local storage, send and receive for BTC, ETH and major ERC-20s with live fee estimation, on testnet then mainnet. Then Phase 2 swap via an aggregator API, Phase 3 fiat on-ramp through a licensed provider, Phase 4 card linkage with your issuer, Phase 5 admin and KYC console. Roughly $6,000-8,000 all in, and each phase is a separate milestone you can stop at. One thing that will decide your architecture more than any code: if the wallet is non-custodial, you avoid holding customer funds. The moment the card spends from a balance you control, you are custodial, and that pulls in money transmitter licensing and AML obligations in most jurisdictions. Your issuer will have a view - worth settling before Phase 4, not during it. Rs equivalent $750, Phase 1 in 3 days, Flutter with native secure enclave and keychain for key storage.

@husainahmed2000

Hi There!!! i understand you are looking to build a cross platform crypto wallet for iOS and Android featuring token swaps, fiat purchasing, and an integrated crypto payment card system. HAVING PREVIOUSLY BUILT AND DEPLOYED PRODUCTION CRYPTO WALLETS WITH INTEGRATED PAYMENT CARDS, DELIVERING A SECURE SOLUTION FOR YOU WILL BE SEAMLESS. Services provided: * Cross platform mobile application development with encrypted key storage * Third party exchange API integration for seamless token swapping * In app fiat purchase integration and payment card balance syncing * Admin dashboard for user management, KYC processing, and card limits * Full store deployment support and security test net validation Let us discuss your project requirements further in chat. Best Regards, Hussain Ahmed

@mayr81

Build a dual-platform crypto wallet & spending card app end-to-end: iOS + Android, secure biometric login, encrypted storage, and robust key management. Implement send/receive with real-time fee calculation, plus an in-app exchange that swaps coins via a third-party liquidity API while keeping users inside the wallet. Add a fiat on-ramp for in-app purchases using card rails, then link virtual/physical card to wallet balances: authorization handling, balance sync, and in-app card transaction history. Deliver backend services for exchange routing, settlement accuracy across testnet/mainnet, and card lifecycle flows aligned with the card-issuing partner. Include admin dashboard for KYC, card activation, limits, and support tooling. Focus on audit-ready encryption and code-level verification, and optimize onboarding so a new user can reach first card spend within 10 minutes. Prioritize App Store / Google Play readiness with compliant data handling and secure transaction UX.