Edit Backend for Crypto Transactions

@mascotindia123

Hello, I have carefully read your project requirements, and it would be an honor to work with you. With over 14 years of experience in full-stack development and blockchain integration, I have worked on secure cryptocurrency transaction systems, wallet integrations, payment gateways, and scalable backend architectures. I will quickly diagnose the root cause of the transaction failures, refactor the backend modules while keeping your existing API endpoints intact, validate transactions on both testnet and mainnet, add clear code comments, update the README, and ensure all automated tests pass before deployment. I understand the urgency of your project and can begin immediately, providing regular progress updates and a smooth handover session to ensure you can confidently maintain the codebase going forward. The budget and timeline can be discussed further after reviewing your existing codebase and the complexity of the required fixes. Please check my profile to see my excellent reviews and ratings from satisfied clients. I would also be happy to share relevant blockchain project experience during our discussion. I am ready to start immediately and look forward to working with you. Warm Regards, Harpreet Singh

@kamran2012

Hi there, I will dig into your transaction modules, trace why payments fail or hang, and fix the signing and broadcast logic so every transfer completes cleanly on both testnet and mainnet. I will also add inline comments and update the README for easy maintenance. The first place I will check is the error handling around transaction building and the RPC responses, where most hanging issues originate. Questions: 1) Which blockchain(s) and libraries are involved? 2) Do you have logs from the failing transactions? I am available to start today and do the handover call once everything passes. Looking forward to discussing further. Best regards, Kamran

@durgesh8527

: As a full-stack development team with over 12 years of experience, we have the comprehensive skills and expertise you need to diagnose, refactor, and enhance the back-end logic powering your cryptocurrency transactions. Our specialized knowledge in PHP and MySQL, particularly for transaction-based systems, makes us an ideal fit for your project. Previous clients have praised our ability to troubleshoot complex codebases swiftly and effectively, and we’re confident we can deliver the same results for you. In addition to fixing the problematic code, we understand the importance of providing comprehensive documentation so that you can maintain and build upon our work in the long-term. That means not just fixing the issues but also adding clear inline comments and updating your README file to provide a thorough account of what we've done. We believe in clear communication from the outset till project completion. You’ll be provided with a timeline of how quickly we can dive into your project, as well as an estimated completion time. Time is of the essence for this task, and given our experience dealing with similar issues at scale before, we're confident that we can rectify any problems on both testnet and mainnet promptly. Let's talk about how we can ensure your backend is working flawlessly- let's start right away.

@krupnovdenis

Hello! We can dive into your backend and fix the transaction flow under the existing API. 1. Which part fails most often: build, sign, or broadcast? 2. Do you already have testnet and mainnet access ready? — About us We are dZENcode – a full-cycle IT company for digital product development: from design and programming to integrations and post-release support. We build projects from scratch and also work on existing solutions that need further development, improvements, or technical support. You can find detailed information about our services and rates on our official website: https://dzencode.com. Please review it – after that, we can discuss the details and agree on the next step. ⚠️ After clarifying all details, we will define the scope, the suitable cooperation format – task-based, outsourcing, or outstaffing – and the final cost. Projects are guaranteed to reach release with us: • 10+ years providing IT services; • 90+ in-house specialists; • 250+ public reviews since 2015; • We support products under SLA after launch; • We work under NDA and a company contract!

@samarhabib

Greetings, I'm a full stack developer with 10+ years of experience, I can quickly diagnose and fix your blockchain backend, ensuring transactions are built, signed, and broadcast reliably while preserving your existing API endpoints. I'll deliver clean, well-documented code, comprehensive testing, and can start immediately to get your platform production-ready. Why work with me? ★ Proven track record: 75 successful projects with 5-star reviews ★ Expertise in Node.js, Angular, React, Express, Python, Django, Flask, PHP, WordPress, Laravel, Codeigniter and more ★ Responsive, deadline-focused, and committed to results ★ 3 months of free post-launch support Let’s schedule a quick chat to discuss your preferred tech stack, timelines, and launch goals. I’m confident I can bring your vision to life. Best regards, Samar H.

@yuliussmayoru

I WILL FIX THE TRANSACTION LAYER WITHOUT BREAKING YOUR EXISTING FRONT END OR API CONTRACTS. Hello! This sounds like a classic case where the UI is fine, but the backend transaction flow has weak points around nonce handling, signing, gas estimation, RPC reliability, chain config, or broadcast confirmation logic. I can jump into the existing codebase, trace the full payment and transfer flow, and isolate exactly why transactions fail or hang. I would start by reproducing the issue on testnet, checking how transactions are built, signed, submitted, retried, and confirmed. Then I would refactor the affected modules while keeping your current API endpoints unchanged, so the frontend continues working as it does now. I would also verify balance queries, mainnet and testnet configuration, error handling, timeout handling, and RPC fallback behavior. After the fix, I will add or update tests for successful transfers, failed broadcast cases, and balance reads, then document the changes with clear inline comments and a short README update. I can work quickly, commit everything to your private repo, and walk you through the result on a handover call. Warm regards, Yulius Mayoru

@techsty2014

Hi there, We will diagnose and fix your server-side transaction layer so wallet payments, transfers, and balance queries complete reliably on both testnet and mainnet. The first step is tracing where transactions hang. Common causes include nonce mismanagement, gas estimation failures, or broadcast timeouts with no retry logic. We will isolate each failure path, fix it, and add tests to confirm. A couple of quick things to confirm: 1) Which blockchain(s) and signing library does the backend use? 2) Are the failures consistent, or do they occur intermittently under load? The number quoted here is a starting estimate. The exact cost and timeline will be confirmed after we go through the full scope together. Looking forward to discussing further. Best regards, Faizan

@codefusion53

Hi I can jump into your existing codebase quickly, diagnose the transaction failures at the server layer, and stabilize the crypto flow without changing the front end API contract. My focus will be on isolating where the process breaks across transaction build, signing, broadcast, balance queries, and network specific handling for both testnet and mainnet. I will refactor or rewrite only the affected backend modules, preserve your current endpoints, and add clear inline comments plus a concise README update so the changes are maintainable. I also include validation through end to end transaction testing and either fixing your current automated tests or adding coverage where it is missing. Once complete, I will commit the working code to your private repo and walk you through the changes in a short handover call so you can reproduce the results confidently. I can start immediately and provide a realistic completion estimate as soon as I review the stack, failing cases, and repo structure. Best, Justin

@Yunsoft

Hey , I just saw your project regarding Edit Backend for Crypto Transactions. I've been building scalable web apps and custom integrations for a while, and this fits right into my wheelhouse. I'm a full-stack developer with hands-on experience in AI (custom LLMs, RAG, workflow automation), SaaS architectures (React, Node.js), and Web3 integrations. Instead of just delivering basic scripts, I focus on building secure, production-ready solutions that actually scale. I've launched multiple real-world products and know how to avoid the common technical pitfalls in these areas. Let's hop on a quick chat so we can go over your exact needs. I can share some of my recent work so you can see the code quality firsthand. Best, Emre

@chiragpipal

⚠️ If you're not happy, you don’t pay. ⚠️ Hi there, Thank you for sharing the detailed project brief. I can fix your cryptocurrency transaction back-end using my blockchain expertise for seamless payments and transfers. I will deliver: • Diagnose and fix transaction failures • Ensure successful payments on testnet and mainnet • Add detailed comments and README updates • Conduct a hand-over call for easy maintenance • Ensure end-to-end wallet transactions with no errors • Keep existing API endpoints intact • Pass all automated tests with added ones You will also receive: • Comprehensive documentation for future reference I am confident I can execute your vision professionally and efficiently. Looking forward to discussing timeline and next steps. Best regards, Chirag.

@MIndlabsAi6

Hey there! I'm really pumped about this opportunity! I recently led a project with similar challenges and nailed it. Drawing from my experience in PHP, Java, Software Architecture, MySQL, Blockchain, Full Stack Development, API Development, Cryptocurrency, I’m ready to dive into your project. Please initiate a chat for further discussion. Cheers, Vishal Maharaj

@demivision

Hi there, Thank you for sharing the details of your project. At Demivision LLC, we are a dedicated team of full-stack developers with extensive experience in blockchain integration, cryptocurrency transaction handling, and robust back-end architecture. We understand that your current challenge lies within the server-side logic that manages transaction construction, signing, and broadcasting, and we appreciate the importance of ensuring every transaction is both reliable and secure. Our team has successfully delivered crypto transaction modules for a variety of platforms, handling everything from wallet operations to high-throughput payment services. We have hands-on expertise with PHP, Java, MySQL, and modern blockchain frameworks, ensuring seamless integration without disrupting your stable front-end or existing API endpoints. To tackle your requirements, our approach would be to begin with a thorough audit of your back-end transaction flows to identify bottlenecks and failure points. We will then refactor or rewrite the affected modules, ensuring compatibility with both testnet and mainnet environments. Comprehensive inline documentation and a succinct README update will be provided to make ongoing maintenance straightforward. All enhancements will be committed to your private repository, and we’ll be happy to guide you through the updates to guarantee you can replicate and maintain these improvements independently. We are confident that our background in scalable crypto integrations and full-stack development will help you achieve reliable, end-to-end wallet transactions with zero disruption to your front-end. Looking forward to collaborating and bringing your project to completion.

@cliftonc20

Hello, your frontend being stable while the backend fails around transaction build, signing, and broadcast points to a state-management and network-finality problem more than a UI issue, and that’s usually where these systems get brittle. The real engineering risk is inconsistent transaction state across signing, submission, and confirmation paths, which is what causes hangs, false failures, and duplicate-send edge cases. I usually start by tracing the full lifecycle, isolating deterministic failures from network-dependent ones, and locking down invariants before refactoring modules. The closest work I’ve done here is Enterprise ProxyTool Client App and Dent-Cloud, where reliability depended on separating orchestration from execution, preserving existing APIs, and making failure states observable enough to fix without destabilizing the rest of the product. I’d approach this by separating transaction assembly, signing, broadcast, and status reconciliation into distinct layers, then adding tests around nonce/sequence handling, retry behavior, and balance-query edge cases across testnet and mainnet. That tends to produce a backend that is maintainable, debuggable, and safe to operate long-term rather than just patched until the next failure. If useful, I can first map the transaction flow and identify the exact failure boundary before touching the public endpoints. Clifton

@ahmaddar2970

With extensive experience in blockchain development and API integration, I am well-equipped to diagnose and optimize your backend for cryptocurrency transactions. My background includes troubleshooting transaction failures, refactoring blockchain modules, and ensuring seamless operation on both testnet and mainnet environments. I will add comprehensive inline comments and update your README to facilitate future maintenance. I understand the urgency and am confident I can deliver a reliable, well-documented solution within 7 days, ensuring minimal disruption to your front-end API and preserving existing functionalities. Looking forward to helping you achieve a robust, scalable crypto transaction backend.

@nowars

Hello, Our team has experience with PHP and MySQL, having successfully built reliable transaction systems for e-commerce platforms that require high levels of data accuracy and secure processing. We have effectively implemented features such as user authentication, transaction logging, and API integrations to facilitate secure communication between front-end users and back-end systems. For your project involving the fix of the back-end layer that powers cryptocurrency transactions, we can develop a robust solution by assessing your existing codebase, isolating problematic areas, and optimizing the logic that handles transaction building and broadcasting. Our approach will involve diagnosing current server-side inefficiencies, restructuring database queries to enhance performance, and implementing comprehensive testing routines to ensure reliability. Thanks, PureCode Company

@josep438

Hi I understand your backend needs to reliably build, sign, and broadcast cryptocurrency transactions without failures or hangs. With deep experience in PHP, MySQL, and blockchain integrations, I can diagnose and fix the transaction flow efficiently. I'll start by tracing the transaction lifecycle—from request to broadcast—using logs and testnet runs to isolate where failures occur. Once identified, I'll refactor the affected modules, ensuring all wallet operations complete successfully while leaving your front-end endpoints untouched. A key risk is mainnet broadcast failure due to incorrect signing or nonce handling, which I'll address by adding robust error handling and fallback logic. I'll validate every change against your acceptance criteria: end-to-end transaction success, passing tests, and documented code with a README update. I can commit directly to your private repo and schedule a hand-over call to ensure you're comfortable replicating the results. Looking forward to hearing from you. Best regards, Jose

@artemb35

I understand you're looking for a seasoned full-stack developer to diagnose and fix the back-end logic for your cryptocurrency transactions. I can help you pinpoint transaction failures and ensure every payment, transfer, and balance query completes successfully on both testnet and mainnet. Here’s how I’ll tackle this: - **Diagnose the back-end issues**: Analyze the existing codebase to identify the root causes of transaction failures. - **Refactor or rewrite modules**: Improve the affected modules to enhance transaction reliability while keeping existing API endpoints intact. - **Add inline comments and update README**: Ensure maintainability by documenting changes clearly within the code and the README file. - **Commit to your private repo**: I’ll push the working code to your repository and prepare for a hand-over call. - **Run tests**: Ensure all automated tests pass, including any new ones I add, to guarantee functionality. I can start immediately and aim to complete this within [insert estimated time based on your assessment]. Do you have any specific tools or libraries you prefer for testing? Looking forward to your response. Best, Artem

@sihalaths9

Hello, I’m glad to have found your project, it aligns perfectly with my skills and professional interests. I’m very interested in debugging and stabilizing your blockchain transaction backend. I understand the frontend is working, and the issue is specifically in the server-side logic where transactions are signed, built, and broadcast across testnet and mainnet. I have strong experience in full-stack development and backend systems involving cryptocurrency workflows, including transaction handling, API design, and debugging complex failure cases in payment and blockchain integrations. I focus on isolating failure points quickly, refactoring only what’s necessary, and ensuring backward compatibility with existing APIs. My approach is to first trace the transaction flow end-to-end, identify where failures or hangs occur, then refactor or rebuild the affected modules while maintaining your existing API structure. I’ll also add clear documentation, inline comments, and update the README so the system remains maintainable. I’d like to go over a few points: Which blockchain network(s) are currently integrated (e.g., Ethereum, BSC, custom chain)? Are there existing logs or error patterns I can review to speed up diagnosis? I’m confident I can make this project a success. Thank you for considering my proposal, and I hope we can collaborate soon.

@jay8mac

Lets chat, a free consultation and no obligation. I understand you need a clean, professional, and user-friendly solution for your "Edit Backend for Crypto Transactions" project. My skills in PHP, Java, JavaScript are a perfect fit for this project. While I am new to freelancer.com, my extensive experience delivers integrated, automated solutions. Regards, Jason McLachlan