Cryptocurrency Project: Full-Stack Developer Needed

@Microlent

Hello, I am Dr. Rajesh Rolen, PhD in Computer Science & Engineering, with experience of over 20+ years in API Development, Flutter, PHP, Vue.js, JavaScript, MySQL, Node.js As a preferred freelancer in the top 1%, I have done 400+ projects here on freelancer.com, I have 4.9 ratings out of 5 on average, which showcases my quality of work and timely delivery. Key Highlights: - Free Hosting Support on the Cloud or any desired platform. - Free 3 months of post-delivery support to ensure that our client doesn’t face any challenges after the launch of the project. - Free Dedicated tester on projects to ensure quality delivery, so clients don’t need to act as a tester. - 10+ Years experience UI/UX team to ensure intuitive UI. Portfolio: https://www.freelancer.com/u/Microlent Please open the chat and send me a message, so we can have a more detailed discussion about the project to give you the project timeline and cost. Thank you for considering my services. I look forward to engaging in a productive conversation and understanding how I can be of assistance in bringing your project to life. Regards Rajesh Rolen

@webbookstudio

Hi there, We understand you're looking for a reliable full-stack developer to take over your existing cryptocurrency project, focusing on debugging, deploying to Google Play, developing new features, and thoroughly testing each task. With our expertise in PHP, Laravel, Node.js, Flutter, React, Vue.js, MySQL, API development, and WebSocket/real-time functionality, we're confident in our ability to deliver. Our similar experience includes building a music voting mobile app using React Native and Node.js, and we've worked on multiple e-commerce projects with integrated payment systems. Can you tell us more about the current state of the project and what specific cryptocurrency and blockchain aspects you'd like us to focus on? Feel free to message us to discuss the details! — Webbook Studio

@shivmirthyusl

Hi, As the head of a reputable web and mobile app development company clocking in a whopping 19+ years in this realm, let me confidently endorse my expertise and pledge my dedication to your cryptocurrency project. Our illustrious 483+ successful projects manifest our capability to transform ideas into concrete digital solutions for clients worldwide just like the challenges your project presents. The proficiencies required for your project read like second nature to us - PHP, Laravel, Node.js, Flutter, React, Vue.js, MySQL, API Development and Integration, WebSocket. To system-wide testing and delivering deployable results on Google Play—charged by your genuine interest in cryptocurrency—I affirm that tackling bugs, completing unfinished functionalities, and even troubleshooting unanticipated issues will not only be done but done meticulously. Give me the gains of working with a seasoned professional in a long-term mode. Let's negotiate terms that's beneficial for both of us. Challenge accepted! Thanks, SBM

@a4logic

Hello, With my extensive 15+ years of experience in JavaScript and PHP, I am well-equipped to take on your cryptocurrency project and fix any lingering bugs and incomplete functionalities. My proficiency in various frameworks such as Laravel, Flutter, React, and Node.js is sure to be an asset when it comes to improving the existing codebase and developing new features. While I understand the importance of completing tasks on time, my topmost priority is to deliver excellent work that has been thoroughly tested. I take immense pride in my ability to find even the most obscure bugs from the depths of a codebase and ensure each task functions flawlessly before deeming it complete. Moreover, being the founder of A4Logic, quality and long-term commitment are values that resonate deeply with me. I genuinely believe in understanding projects inside and out, contributing meaningfully, and taking full responsibility for their success. Together, let's Create something truly impactful in the world of cryptocurrencies! Thanks!

@tangramua

Dear ,   We carefully studied the description of your project and we can confirm that we understand your needs and are also interested in your project. Our team has the necessary resources to start your project as soon as possible and complete it in a very short time.   We are 25 years in this business and our technical specialists have strong experience in PHP, JavaScript, MySQL, Node.js, Laravel, Vue.js, Flutter, API Development and other technologies relevant to your project.   Please, review our profile https://www.freelancer.com/u/tangramua where you can find detailed information about our company, our portfolio, and the client's recent reviews.   Please contact us via Freelancer Chat to discuss your project in details.    Best regards, Sales department Tangram Canada Inc.     

@techplusintl

★★★ PHP & Laravel SPECIALIST ★★★ Hi, I can debug and fix issues for your cryptocurrency project. I will investigate all bugs and ensure every feature works well before marking it complete. I will maintain the codebase and communicate clearly about progress and any problems. Let’s discuss how I can help you with this project. Thanks!

@ykarora26

With experience in PHP, Laravel, and React, I specialize in fixing bugs and enhancing functionality, ensuring a seamless user experience. Could you provide more details on the specific bugs and features that need attention in your existing cryptocurrency app? Regards, Yogesh Kumar

@asifalimzd

Hi there, We can take over your existing crypto project, investigate and fix current bugs, develop unfinished features, handle API/WebSocket functionality, and deploy the Flutter app to Google Play. We’ll test every fix properly before marking it complete and provide clear, consistent progress updates throughout the project. Can you share the existing codebase and a list of the current bugs/unfinished features so we can review the project and get started? Kindly send me message to discuss more or directly award me. Thank you!

@rizwange4

As a skilled full-stack developer, I am confident in tackling all your project requirements- from debugging and deploying to incorporating new functionalities. My technical background includes proven competence with PHP, Laravel, Node.js, MySQL, and API development; not to mention my proficiency in the deployment aspect on Google Play. Moreover, I am experienced in working with real-time technologies like WebSockets which might come in handy for any runtime functionality your cryptocurrency app might require. Lastly, I share your passion for the cryptoworld! Beyond just token enthusiasm, my strong interest and knowledge in the blockchain industry including crypto wallets means that I understand the specific intricacies involved in creating a successful cryptocurrency application. With me on board, expect more than just performance — anticipate strategic insights and innovative solutions to aid in fine-tuning and propelling your cryptocurrency venture forward. Let's connect and discuss how our mutual interest can intersect for the success of your project!

@corpmember29

HELLO, I HAVE CAREFULLY REVIEWED YOUR REQUIREMENTS AND UNDERSTAND THAT YOU NEED A DEVELOPER TO TAKE OWNERSHIP OF AN EXISTING CRYPTOCURRENCY APPLICATION, NOT JUST COMPLETE INDIVIDUAL TASKS. I HAVE 10+ YEARS OF EXPERIENCE WITH PHP, LARAVEL, NODE.JS, FLUTTER, REACT, VUE.JS, MYSQL, REST APIs, WEBSOCKETS, AND MOBILE APP DEVELOPMENT. I AM COMFORTABLE WORKING WITH EXISTING CODEBASES, DEBUGGING COMPLEX ISSUES, INTEGRATING NEW FEATURES, AND HANDLING GOOGLE PLAY DEPLOYMENT. MY APPROACH → Codebase Review → Reproduce Issues → Identify Root Cause → Implement Fix → Unit/Functional Testing → End-to-End Verification → Deployment → Monitoring & Maintenance. FOR EACH TASK, I WILL TEST THE ACTUAL WORKFLOW BEFORE CONSIDERING IT COMPLETE AND CLEARLY COMMUNICATE PROGRESS, ISSUES, AND EXPECTED TIMELINES. I CAN ALSO WORK WITH CRYPTO WALLETS, BLOCKCHAIN/API INTEGRATIONS, AND REAL-TIME TRANSACTION FUNCTIONALITY. I WILL FOLLOW AGILE METHODOLOGY, PROVIDE COMPLETE SOURCE CODE, 2 YEARS OF FREE ONGOING SUPPORT, AND ASSIST FROM DEVELOPMENT THROUGH GOOGLE PLAY DEPLOYMENT. I AM INTERESTED IN A LONG-TERM WORKING RELATIONSHIP AND CAN START IMMEDIATELY. I EAGERLY AWAIT YOUR POSITIVE RESPONSE. THANKS

@SBITServices

Hi, I have strong experience with Php, Laravel and Code ignitor. I’ll develop robust and secure web application just the way you want. I can handle any updates you need. You can check my reviews to see the quality of my work, I will share my previous application in private chat. Lets connect in chat so that We discuss further. With Regards, Sai

@onkarkulkarni8

Hello, I your "Cryptocurrency Project: Full-Stack Developer Needed" project description in detail and undertood your requirements. I've worked on many PHP projects in recent times. So I am confident on achieving your expected Goals. Please initiate a communication thread to discuss further and start with the project. ⭐ 5.0/5 from a recent client: "A more professional version: “Excellent work! The job was completed within the committed timeline. Great quality, professionalism, and timely delivery. Highly appreciated and recommended.”" Final timeline and cost will be confirmed in chat after a complete understanding and documentation of the project expectations in detail.

@ozbas

As a seasoned full-stack developer with over a decade of experience, I firmly believe that I am the perfect fit for your cryptocurrency project. My diverse skill set of PHP, Laravel, Node.js, Flutter, React, Vue.js, MySQL, API development and integration aligns perfectly with your project requirements. Moreover, my proficiency in handling WebSocket and real-time functionalities ensures efficient debugging and feature development. Being a passionate developer who takes pride in her work, I understand the importance of thorough testing and verification before marking any task complete. Your dedication to ensuring functionality resonates with me greatly and I can assure you that my commitment towards producing top-notch results is unwavering. Furthermore, I have a genuine interest in the cryptocurrency world as evidenced by my extensive experience in developing Web and Mobile applications within this realm. In addition to my technical expertise, my good communication skills will keep you informed about the progress of the project at every step. It will be an honor to understand your project deeply and contribute to its success long-term rather than taking up isolated tasks without accountability. Let me bring reliability, integrity and exemplary problem-solving abilities to maximize the potential of your cryptocurrency project!

@DeveloperStation

Hi, Taking over a half-finished app usually means the first real task is not writing code, it's mapping what's actually broken. Before I touch a fix I'd do a short audit pass, reproduce each bug, and confirm behaviour against what you expect, so nothing gets marked done on a guess. I work daily in Laravel with Vue and Node backends, and clients keep me on for following directions and shipping tested work. One left this: "follows directions well and needs less guidance, good work." We've also shipped Laravel apps with real-time updates and payment flows, plus Flutter and React Native mobile builds through to store deployment. One question to start: what's the single most blocking bug right now? I'll reproduce it first and report back before anything else. Adil

@C0RETECHIES

Hi there, It sounds like you need a developer to stabilize an existing crypto platform. This means diagnosing issues across the Laravel/Node.js backend and Flutter app, likely related to wallet operations, real-time data, and transaction processing. The priority is to fix bugs to create a reliable foundation before adding new features. Technical approach: My first step is to set up a dedicated staging environment. The backend (Laravel/PHP) and real-time services (Node.js/WebSocket) will be audited. The Flutter app will connect to staging for all debugging and development, keeping production stable. All API endpoints will be documented and rigorously tested. Core modules: User Wallet Management (creation, balance sync), Transaction Engine (deposits/withdrawals), Real-time Market Data (WebSocket), and an Admin Panel for oversight. Relevant systems: We've built complex Flutter/Laravel systems like StepOut Live (a 4-app ecosystem) and real-time apps like Fanhut (using WebSockets), which aligns directly with your stack and functional requirements. My strategy starts with a code audit and bug triage. We'll prioritize fixes, which I'll deploy to staging for your verification. Every task is only marked complete after thorough testing. This process ensures stability and a predictable path for new features. Regards, Rohit

@anjalihooda

Hi, I can take over your existing cryptocurrency project, understand the current codebase, fix the existing issues, and continue improving the application long-term. I have experience working with existing applications built with PHP/Laravel, Node.js, React, Vue.js, Flutter, MySQL, APIs, and real-time functionality. A big part of my work is joining projects that are already in development, understanding how everything is connected, and making changes without breaking existing features. My approach is simple: first understand the current implementation, reproduce the issues, fix them properly, and test the complete flow before considering the task finished. I can help with: - Debugging and fixing existing issues - Laravel/PHP backend improvements - API development and integrations - Flutter app updates and Google Play deployment - Database and performance improvements - New feature development - Testing and verification after every change I am comfortable working on long-term projects where reliability and communication are important. I do not consider a task complete just because the code change is done; it needs to work correctly from the user’s side. I can start by reviewing the current application, setup, and pending issues to understand the best way forward. Thanks, Anjali

@giaphung2k1

Hello I can dive into your codebase to identify those bugs and stabilize the existing functionality before we move forward with the remaining features. I have extensive experience managing full-stack crypto applications and navigating the Google Play deployment process. Do you have a list of the specific errors you're encountering right now? Giáp Văn Hưng

@seospider

Hello, Your existing crypto app needs careful takeover: reproduce each bug, fix the root cause, test every flow properly, and deploy only after verification—not just mark tickets “done.” I have strong experience with Laravel/PHP, Node.js, React, MySQL, REST APIs, WebSockets, production debugging, and maintaining existing codebases with multiple services. I’m comfortable working long-term, documenting changes, and handling new features alongside fixes. What is the current Flutter/Laravel/Node architecture, and which issues are most critical now—wallet transactions, real-time prices, authentication, or Play Store deployment? Best Regards Hasan

@vishal1145

Your Flutter app will fail Google Play review if the WebSocket connections aren't properly handling reconnection logic during network drops. Most crypto apps get rejected because real-time price feeds freeze when users switch between WiFi and mobile data. Quick questions - are you currently rate-limited by any exchange APIs during high-volume trading periods? And what's your rollback strategy if a deployment introduces a critical bug in production? Here is the architectural approach: - FLUTTER + GOOGLE PLAY: Implement proper lifecycle management for WebSocket reconnection, configure ProGuard rules to prevent obfuscation errors, and set up staged rollouts to catch crashes before full release. - LARAVEL + NODE.JS: Refactor the backend to use queue workers for blockchain transaction processing so API timeouts don't block user requests, and add Redis caching to reduce database load during price updates. - API + MYSQL: Build a transaction audit log that tracks every state change in crypto wallets, add database indexes on high-frequency queries, and implement API versioning so mobile updates don't break older app versions. I've debugged similar crypto platforms where "fixed" features still failed under load because developers didn't test edge cases like partial transaction confirmations. Let's schedule a 30-minute code review so I can identify the highest-risk bugs before you waste budget on surface-level fixes.