You will get Backend Node.js Developer | NestJS API & Scalable Database Design
Top Rated
Top Rated
Project details
Your product is only as steady as the backend under it. If your API is slow, your data model is a mess, or you are scaling past what the current setup can take, that is what I fix.
I led a zero-downtime migration of a NASDAQ-listed company's ERP from legacy VB to Node.js/NestJS, and scaled a fintech product (StockPe) past 300K users.
WHAT YOU GET
✅ REST or GraphQL APIs built on Node.js / NestJS / Express
✅ Clean database design and indexing (PostgreSQL, MongoDB)
✅ Auth done right: JWT, OAuth, role-based access
✅ Caching, queues and background jobs (Redis, BullMQ, Kafka)
✅ Deployment, CI/CD and monitoring on AWS or DigitalOcean
✅ Readable, tested code your team can take over
WHY ME
Top Rated Plus, 100% JSS, 2,215+ hours, 12+ production apps shipped.
This is a monthly hire, not a quick gig. Book the Starter, tell me what you are building, and you get a clear plan and cost before any commitment.
I led a zero-downtime migration of a NASDAQ-listed company's ERP from legacy VB to Node.js/NestJS, and scaled a fintech product (StockPe) past 300K users.
WHAT YOU GET
✅ REST or GraphQL APIs built on Node.js / NestJS / Express
✅ Clean database design and indexing (PostgreSQL, MongoDB)
✅ Auth done right: JWT, OAuth, role-based access
✅ Caching, queues and background jobs (Redis, BullMQ, Kafka)
✅ Deployment, CI/CD and monitoring on AWS or DigitalOcean
✅ Readable, tested code your team can take over
WHY ME
Top Rated Plus, 100% JSS, 2,215+ hours, 12+ production apps shipped.
This is a monthly hire, not a quick gig. Book the Starter, tell me what you are building, and you get a clear plan and cost before any commitment.
Programming Languages
JavaScript, Python, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$50
|
Standard
$2,000
|
Advanced
$3,000
|
|---|---|---|---|
| Delivery Time | 1 day | 20 days | 30 days |
Number of Revisions | 0 | 1 | 2 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code | - | - | - |
Frequently asked questions
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DS
Daniel S.
Jun 30, 2026
AWS PWA Development and Deployment Expert Needed !ONLY SOLO Freelancer!
Jaykumar understands requirements fast and delivers in excellent quailty. If that would not yet the peak, he is self driving sees improvement opportunities and is 100% result driven. Thanks Jay for our exceptional contribution and perfect delivery.
EG
Eugene G.
Sep 22, 2025
Node.js Expert with 5+ years experience
Great work!!!
FM
Fuad M.
Apr 7, 2025
React Site Updates
My react project was delivered much faster than expected with higher quality than asked for.
About Jaykumar
Senior Backend Engineer | Node.js - NestJS | System Architecture
100%
Job Success
Ahmedabad, India - 7:05 am local time
I am a Senior Backend Engineer with over 6 years of experience building, scaling, and operating production systems across Fintech, E-commerce, Enterprise ERP, and AI platforms. I specialize in turning complex business requirements into high-performance, maintainable microservice architectures.
🚀 My Expertise Includes:
- Architectural Leadership: Led a zero-downtime migration of a legacy Visual Basic ERP to a NestJS and Oracle architecture for a NASDAQ-listed US company (inventory, rentals, warehouse, logistics, barcode, real-time sync, high-speed catalog search).
- Performance Engineering: Reduced API latency by 90-92% (from around 1.5s down to 50-150ms) through database indexing, schema design, and query optimization, and cut infrastructure cost by 50%+ via database normalization and server tuning.
- High-Throughput Systems: Built background job pipelines processing 10,000+ jobs every 10 minutes and 600,000 to 700,000 jobs per hour at near-zero error rate using Laravel Horizon.
- Financial Systems: Integrated major payment gateways (Stripe, Stripe Connect, Razorpay, Actum ACH, Cosmo, NetBilling, PayPal) with subscription billing and marketplace payouts, and built backend for StockPe, a fintech platform serving 300,000+ users, ranked #2 Product of the Day on Product Hunt.
- Integration & Scaling: Integrated 3rd party services (Twilio, SendGrid, Brevo, OpenAI, Gemini) and scaled a live creator platform to roughly 50,000 concurrent users on AWS.
- AI Systems: Built the backend and multi-agent orchestration for KitchenCloud.AI, routing requests across 6 specialized sub-agents on NestJS with vector search and persistent memory.
- Infrastructure & DevOps: Docker, serverless (AWS Lambda), AWS (EC2, S3, SQS, IVS, MediaConvert), DigitalOcean, and Vercel with zero-downtime deployments and CI/CD.
🛠 Technical Stack:
- Languages: TypeScript, Node.js,JavaScript, PHP.
- Frameworks: NestJS (Expert), Express.js, Laravel.
- Databases: PostgreSQL, Oracle, MySQL, MongoDB, Redis, DragonflyDB.
- Messaging & Real-Time: Kafka, RabbitMQ, BullMQ, Laravel Horizon, Socket io, gRPC, Event-Driven Architectures.
📊 Notable Achievements:
- Reduced API latency by 90-92% (from around 1.5s to 50-150ms) through indexing, schema design, and query optimization.
- Processed 600,000 to 700,000 background jobs per hour (10,000+ every 10 minutes) at near-zero error rate.
- Cut infrastructure cost by 50%+ through database normalization and server optimization.
- Delivered a zero-downtime Visual Basic to NestJS + Oracle ERP migration for a NASDAQ-listed company.
- Built backend for a fintech serving 300,000+ users (StockPe, #2 Product of the Day on Product Hunt).
- Top Rated Plus on Upwork with 100% Job Success and 2,215+ hours billed.
I thrive in remote, high-ownership environments and care about clean, maintainable code that holds up in production and aligns with long-term business goals.
Let's build scalable backend systems that help your business grow.
Steps for completing your project
After purchasing the project, send requirements so Jaykumar can start the project.
Delivery time starts when Jaykumar receives requirements from you.
Jaykumar works on your project following the steps below.
Revisions may occur after the delivery date.
Discovery and architecture
We get on a call, I map your data model, API surface and scaling needs, then send a written plan, timeline and cost.
API and data layer
I build the core APIs (REST or GraphQL), schema and auth (JWT/OAuth, role-based access) with clean, tested code.