
Closed
Posted
Paid on delivery
I'm rebuilding the entire server side of my Android and iOS apps in Node.js. The current apps talk exclusively to a set of RESTful endpoints, and those endpoints handle three critical jobs for me right now: authenticating users, processing payments (using the CCAvenue gateway), and keeping local data in sync with the cloud. We also use WooCommerce custom REST API and its database for other core functions (products, orders, etc.) — but payments go through CCAvenue, not WooCommerce. I want every one of those workflows reproduced in Node so I can move faster with new features and scale without the legacy overhead. You'll have full freedom to modify the back-end codebase, database schemas, and deployment scripts as needed. All existing REST routes must remain available (or be cleanly proxied) so the mobile clients continue to work while we test the new stack. Once the Node service passes integration tests and the apps run error-free against it, we'll decommission the old API. I'll provide the current API documentation, sample requests, test accounts, and direct access to the staging servers the apps already point to. Your deliverable is a production-ready Node.js backend — well-structured, documented, and unit-tested — that mirrors the functionality of the existing service and is ready for me to drop into our CI/CD pipeline.
Project ID: 40401284
338 proposals
Remote project
Active 4 days ago
Set your budget and timeframe
Get paid for your work
Outline your proposal
It's free to sign up and bid on jobs
338 freelancers are bidding on average $481 USD for this job

Hello, I will rebuild your server side in Node.js to mirror every workflow from authentication to payments via CCAvenue and data sync with the WooCommerce REST API, while keeping existing routes accessible during the migration. You’ll get a production-ready backend with clean architecture, clear docs, and solid unit tests, designed to drop into your CI/CD pipeline. I’ll redesign schemas only where needed for scale, ensure secure token handling, implement robust payment flows, and provide a clean proxy layer for any deprecated routes. I’ll deliver a well-documented codebase with automated tests and a deployment script that fits into your staging to production rollout, so your mobile apps stay stable as we test the new stack. The deliverable will be production-ready, maintainable, and ready for feature expansion with minimal risk. What are the top three pain points you want the Node backend to solve first, and what must-have tests do you require for authentication, CCAvenue payments, and WooCommerce data sync? Best regards,
$750 USD in 12 days
9.0
9.0

Hello, I have over 12+ years in backend engineering and API migrations, we can replicate your existing system in Node.js while keeping all current mobile endpoints fully functional during transition. Approach: We’ll reverse-engineer your current REST APIs, rebuild them in a modular Node.js architecture, and maintain backward compatibility via route parity or proxying—ensuring zero disruption to your Android/iOS apps. Core Modules: • Authentication (secure, token-based) • Payment integration (CCAvenue – auth, capture, callbacks) • Data sync engine (real-time/queued sync logic) • WooCommerce API integration (products, orders, users) Workflow: Analyze existing APIs → Rebuild endpoints in Node → Map DB/schema → Integrate CCAvenue + WooCommerce → Parallel testing → Switch to new backend Tech Stack: Node.js (Express/NestJS), PostgreSQL/MySQL, Redis (caching/queues), REST APIs, CI/CD ready structure Key Focus: • 100% API compatibility (no app changes needed) • Clean, scalable architecture • Secure payment handling • Unit + integration testing • Smooth migration with zero downtime Thanks
$350 USD in 7 days
8.4
8.4

Hi, This is Elias from Miami. I checked your project description and understand you need to rebuild the existing mobile backend in Node.js while preserving current REST routes for auth, CCAvenue payments, cloud sync, and WooCommerce custom API/database workflows. I’ve worked on backend migrations where the key was matching existing API behavior, keeping mobile apps stable, and safely moving from legacy services to a cleaner Node.js architecture. My approach would be to document and mirror all current endpoints first, build the Node service with tests around existing request/response flows, then run staging integration before switching traffic fully. I’d be happy to review your API docs and suggest a clean migration plan. I have a few questions to get a better understanding: Q1 – What is the current backend built with, and how many REST endpoints need to be migrated? Q2 – Should Node.js connect directly to the existing WooCommerce database, or only through WooCommerce custom REST APIs? Q3 – Do you already have CI/CD and test coverage in place, or should that be set up as part of this rebuild? Looking forward to hearing from you.
$500 USD in 7 days
8.3
8.3

Hello, I’ve gone through your requirement and understand you’re looking to build a modern, sleek construction website with a strong focus on lead generation rather than just a visual presence. I have worked on similar projects in the past as well where the focus was on creating clean, conversion-focused websites. My approach would be to create a structured and trustworthy layout that clearly presents your services, builds credibility, and guides visitors toward action through a strategically placed, easy-to-use contact form. I would also ensure the design is fully responsive, fast-loading, and built with proper SEO structure so the website performs well in both user experience and search visibility. I can start immediately and deliver a clean, modern, and conversion-focused website within the agreed timeline.
$700 USD in 7 days
7.4
7.4

Hi there, We can help you with rebuilding your entire backend in Node.js while keeping your existing apps stable during the transition — that part is very important and we’ll handle it carefully. From what I understand, your apps are tightly coupled with current REST endpoints handling auth, CCAvenue payments, and data sync, along with WooCommerce APIs for products and orders. Instead of breaking anything, we’ll mirror the same routes in Node (or proxy where needed) so the mobile apps continue to work while we gradually shift traffic to the new service. We will start by going through your current API docs and staging setup, mapping each endpoint and its logic. Then we’ll rebuild them in Node with a clean structure, better performance, and proper separation of modules (auth, payments, sync, integrations). CCAvenue flow will be handled carefully since it’s critical, and WooCommerce integration will remain intact. We’ll also make sure the new backend is well-tested, documented, and easy to plug into your CI/CD, so once everything passes integration testing, switching off the old system becomes smooth. When you share the API documentation, sample requests, and staging access, I can quickly review and outline the exact migration plan. Thanks, Rahul A.
$260 USD in 7 days
7.4
7.4

Hey, I will build your production-ready Node.js backend — user authentication, CCAvenue payment processing, and cloud data sync — while keeping existing REST routes live through a proxy layer so your mobile clients never break during migration. For the CCAvenue integration, I will implement request signing and response decryption server-side with proper HMAC validation, and wrap it in a retry-safe idempotency layer. This prevents duplicate charges if a mobile client retries a timed-out payment request — a common issue when migrating payment flows to a new stack. Questions: 1) Is the current backend PHP-based, and are the WooCommerce custom REST APIs staying on their existing server or also moving to Node? 2) What database are you using for auth and sync — MySQL tied to WooCommerce, or a separate store? Looking forward to discussing further. Best regards, Kamran
$270 USD in 10 days
7.4
7.4

Hi - the real risk here is not rewriting APIs in Node, it is preserving mobile behavior while auth, CCAvenue payments, WooCommerce custom REST data, and cloud sync move behind the scenes. I’d start with route parity so the iOS and Android apps can switch to the new backend without client-side disruption. App logs in - token is issued - product/order data flows through WooCommerce custom APIs - payment goes through CCAvenue - callback updates order state - sync pushes local changes to cloud. Looks correct, but fails when payment callbacks or sync retries behave differently than the legacy API. Duplicate callbacks can cause wrong order status in real use, so I handle it with idempotent payment handling and integration tests. Input - existing REST calls. Processing - Node services. Output - same app behavior. The part to get right early is endpoint compatibility.
$500 USD in 7 days
7.0
7.0

Hi, We can rebuild your complete mobile app backend in Node.js while keeping your Android and iOS apps fully operational during migration. Our approach: • Recreate all existing REST endpoints for seamless app compatibility • Maintain or proxy current routes while testing new services • Rebuild core flows: user authentication, data sync, and CCAvenue payment integration • Integrate existing WooCommerce custom REST APIs + database for products, orders, and related functions What we’ll deliver: • Clean, scalable Node.js architecture • Updated database schemas where needed • Unit-tested, documented codebase • CI/CD-ready deployment setup • Smooth transition from legacy API to Node stack Migration plan: We’ll work in stages—replicate endpoints, run integration tests, verify apps error-free, then decommission old services safely. We have strong experience with Node.js APIs, payment gateways, WooCommerce integrations, and zero-downtime migrations. Ready to start after reviewing your docs and staging access. Regards Interconnect Team
$500 USD in 7 days
6.8
6.8

Hello, With a proven track record of creating scalable and efficient web services, our team at MySoftware understands the importance of maintaining the functionality while upgrading the technology. Your project requires replicating crucial endpoints that handle authentication, payments, and data syncing. Drawing on years of experience in Mobile App Development, we have gained intimate knowledge of RESTful architecture combined with Node.js that is perfect for this task. Moreover, you have specified the need for modifying the back-end codebase, database schemas, and deployment scripts - our expertise extends to all these areas effectively. We are adept at utilising existing technologies like WooCommerce and CCAvenue while transitioning into new ones like Node.js. While strictly following your existing API documentation, we ensure thorough testing to make sure every route is available or proxied cleanly for seamless client functionality. Our deliverable will not be limited to just recreating a functioning backend; we are staunch believers in well-structured codebases with proper documentation and unit tests. Our approach aligns with your vision of speeding up deployment cycles and ensuring prompt scalability without legacy constraints. By choosing us for this project, you can expect a highly professional and skilled team putting their best efforts into making your goals a reality Thanks!
$350 USD in 4 days
6.7
6.7

Hi there, We’ve built several production-level Node.js backends that handle user authentication, payment processing, and data synchronization. One of our recent projects involved creating a complete Node.js backend for a mobile app, where we integrated CCAvenue and Stripe for payments, along with Firebase for notifications. We also have extensive experience with WooCommerce, having developed custom plugins and integrated it with multiple systems. This means we can efficiently manage product and order data while ensuring seamless payment workflows. Let’s schedule a quick 10-minute call to discuss your project in more detail and see if I’m the right fit. I usually respond within 10 minutes. I’m eager to learn more about your exciting project. Best, Adil
$496.32 USD in 7 days
6.7
6.7

Hi, I’m Abhishek Rathore, a senior full-stack engineer. You’re rebuilding your mobile API layer in Node while keeping existing REST contracts intact—covering auth, CCAvenue payments, and WooCommerce-backed data sync. I can replicate this cleanly without breaking your apps during transition. ? Approach I’ll build a modular Node.js service using NestJS (structured, testable) with PostgreSQL. Existing endpoints will be mirrored or proxied via an API gateway layer to ensure zero client disruption during rollout. ✅ Core Features - Full replication of current REST endpoints (auth, payments, sync) - Secure CCAvenue integration with checksum handling and callbacks - WooCommerce API + DB integration for products/orders - Token-based auth (JWT) with refresh flow - Data sync layer with conflict handling and audit logs - Backward-compatible routing or proxy layer ☁️ Reliability / Performance Idempotent payment handling, retry-safe webhooks, and structured logging. I’ll isolate payment flows and use queueing (BullMQ) for async tasks to avoid blocking APIs. ? Deliverables Production-ready Node backend, unit/integration tests, API docs, deployment scripts, and staging validation. ? Why Me Built similar API migrations for mobile apps with payment gateways and WooCommerce sync (incl. Rhythm platform). Quick question: do you want WooCommerce reads cached locally or always fetched live?
$562.50 USD in 5 days
6.6
6.6

Hi, Doomshell Software Pvt. Ltd. brings 20+ years of experience in scalable backend development and API modernization, and we’d be glad to support your Convert Mobile APIs to Node project with a secure, production-ready migration approach. Our approach: API Migration & Backend Rebuild • Recreate existing REST endpoints in Node.js while maintaining backward compatibility • Migrate authentication, cloud sync workflows, and core mobile API logic • Support clean proxying or phased endpoint replacement during testing Payments & Integrations • Rebuild CCAvenue payment workflows, callbacks and transaction logic • Maintain WooCommerce custom REST API and database integrations • Optimize schema, backend structure and deployment scripts where needed Testing & Deliverables • Unit-tested Node.js backend ready for CI/CD pipeline • Integration testing against existing mobile apps and staging servers • Technical documentation and structured handoff support Why us: • Strong expertise in Node.js, REST API migration and payment integrations • Focus on secure, scalable and maintainable backend architecture • Fast turnaround with milestone-based collaboration Quick question: Would you like the Node architecture designed from the start to support versioned APIs and microservice-ready modules for future feature scaling beyond the legacy workflows? We’d be happy to review your API documentation and start promptly. Best regards
$500 USD in 7 days
6.2
6.2

Hello 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 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 , java spring boot and php CodeIgniter mvc. Please consider me and initiate a chat for further detailed discussion. Regards, Anju
$400 USD in 7 days
6.5
6.5

With over 248 successful projects completed, including numerous instances of API integration and mobile app development, my team at Einnovention is no stranger to the complexity and vastness of tasks like converting mobile APIs to Node.js. We are more than prepared to tackle this project head-on and provide an efficient, high-quality solution. Additionally, we have a comprehensive understanding of WooCommerce's custom REST API as well as the CCAvenue payment gateway. This means that we can adeptly handle your payments while ensuring that essential functions centred around products and orders operate seamlessly via WooCommerce. Lastly, our expertise extends to CMS systems such as WordPress, demonstrating our capability in not just creating but also scaling enterprises. This aligns perfectly with your request for a new backend system that can facilitate faster feature releases and scalable growth. At the end of the journey is a production-ready Node.js backend that mirrors your existing service but with improved efficiency and functionality – a task I am ready to take on with dedication, diligence, and determination. It would be my pleasure to serve you!
$500 USD in 7 days
6.5
6.5

Hi, I’m excited to propose rebuilding your server-side in Node.js while keeping everything running smoothly. Here’s what I plan to do: 1. Rebuild RESTful Endpoints: I’ll recreate the authentication, payment processing (using CCAvenue), and local data sync functionalities using Node.js. 2. Maintain Compatibility: All existing REST routes will be preserved or cleanly proxied so that your mobile clients continue to function seamlessly during transition. 3. Enhance Scalability & Speed: The new stack will allow for faster development of new features and easier scaling. 4. Full Codebase Freedom: I’ll have the freedom to modify the back-end code, database schemas, and deployment scripts as needed. 5. Documentation & Testing: The Node.js backend will be well-structured, documented, and thoroughly unit-tested. This includes integration tests to ensure everything works as expected before decommissioning. I’ll leverage my decade of experience in this field to deliver a high-quality product. You can review my portfolio at <https://www.freelancer.com/u/reedsystems> for more details on past projects. Looking forward to the opportunity! Reed
$550 USD in 10 days
6.1
6.1

Hello! I understand you're looking to rebuild the server-side of your Android and iOS apps in Node.js, maintaining key functionalities such as user authentication, payment processing through CCAvenue, and syncing local data with the cloud. I can help you replicate your current API workflows with a production-ready Node.js backend, making sure to maintain full compatibility with the existing mobile clients while transitioning to the new stack. I'll ensure the backend is scalable, well-structured, documented, and fully tested with unit tests to ensure reliability.
$500 USD in 7 days
6.6
6.6

Hello There!!! ★★★★ (Node.js backend rebuild for mobile APIs with payment + WooCommerce sync ready) ★★★★ Project understanding: I understand you want to rebuild your existing Android/iOS backend into Node.js while keeping all current REST APIs working for authentication, CCAvenue payments, and WooCommerce-based product/order sync. The new system must stay backward compatible during migration and be production ready. ⚜ Rebuild full REST API layer in Node.js (modular architecture) ⚜ Recreate authentication & session management securely ⚜ Integrate CCAvenue payment gateway flow in Node backend ⚜ Sync WooCommerce products/orders via REST API ⚜ Maintain backward compatibility / proxy existing endpoints ⚜ Design scalable DB schema improvements if needed ⚜ Add unit tests + clean deployment (Docker/CI ready) I’ve worked on Node.js migrations from legacy PHP/Python APIs and handled payment + eCommerce integrations before. I’ll first mirror current endpoints, then gradually replace services so mobile apps never break during transition. Code will be clean, documented and easy to extend for future scaling. Let’s discuss and I can start immediately after reviewing your current API structure. Warm Regards, Farhin B.
$256 USD in 10 days
6.6
6.6

Hi I can rebuild your existing mobile app backend in Node.js while keeping the current REST API behavior stable for Android and iOS. The main technical challenge is migrating authentication, CCAvenue payments, WooCommerce custom REST/database logic, and cloud sync without breaking existing mobile clients. I would structure the backend with Node.js, Express/NestJS, REST controllers, service layers, database migrations, and clear API compatibility mapping. For CCAvenue, I can reproduce the payment initiation, checksum/encryption flow, callbacks, status verification, and error handling outside WooCommerce. I’ll also handle WooCommerce custom API integration, product/order data access, sync workflows, staging deployment, unit tests, and integration test coverage. The final backend will be documented, CI/CD-ready, and built so legacy endpoints can remain active through direct implementation or clean proxy routing. Thanks, Hercules
$500 USD in 7 days
6.3
6.3

Hello! As per your project post, you’re looking to rebuild and migrate your existing mobile backend (Android + iOS APIs) into a modern Node.js architecture while maintaining full backward compatibility with your current REST endpoints. The goal is to replace legacy backend logic without disrupting live mobile apps, while improving scalability, maintainability, and deployment efficiency. My focus will be on delivering a clean, production-ready Node.js backend that replicates and enhances your current system while ensuring zero downtime for existing mobile clients during the transition phase. I will carefully mirror all existing REST endpoints so that your Android and iOS applications continue functioning seamlessly while the new Node service is tested in parallel. I specialize in backend modernization and API migration projects where legacy systems need to be safely transitioned into scalable Node.js architectures without breaking existing mobile or production dependencies. Let’s connect to review your current API structure and staging setup so we can design a safe migration strategy and define the rollout phases. Best regards, Nikita Gupta.
$300 USD in 10 days
5.9
5.9

Hi I am excited about the opportunity to rebuild your server-side infrastructure in Node.js for your Android and iOS apps. With extensive experience in backend development and RESTful API design, I am well-prepared to create a scalable and efficient Node.js backend that mirrors your current functionality while allowing for future enhancements. I will ensure that the new Node.js service handles user authentication, payment processing through the CCAvenue gateway, and data synchronization with the cloud, replicating the existing workflows seamlessly. I will maintain all current REST routes or implement clean proxies to ensure the mobile clients continue functioning without interruption during the transition. The deliverable will include a well-structured, documented, and unit-tested Node.js backend, ready for integration into your CI/CD pipeline. I will utilize the provided API documentation, sample requests, and access to staging servers to ensure a smooth migration process. I estimate that the project will take approximately [insert timeline] to complete, and I look forward to discussing any additional requirements or features you may want to include in this rebuild. Best, Justin
$500 USD in 7 days
5.9
5.9

Dubai, United Arab Emirates
Payment method verified
Member since Aug 15, 2018
₹1500-12500 INR
₹600-1500 INR
₹37500-75000 INR
$250-750 USD
₹600-1500 INR
₹600-1500 INR
₹600-1500 INR
₹1500-12500 INR
$750-1500 USD
$30-250 USD
€8-80 EUR
$30-250 AUD
$250-750 USD
$10-30 USD
$30-250 USD
₹12500-37500 INR
$250-750 USD
€250-750 EUR
$30-250 USD
$8-15 AUD / hour
£250-750 GBP
₹12500-37500 INR
₹100000-550000 INR
$250-750 USD
$150 USD