You will get a production-ready REST API with Node.js and NestJS
Top Rated
Project details
I build production-grade REST APIs that handle real traffic without breaking. With 30 completed contracts and a 100% Job Success Score, I specialize in NestJS and Node.js backends with proper error handling, idempotency, and documentation. You get clean, maintainable code with a full explanation of every decision made.
Programming Languages
PHP, JavaScript, PythonCoding Expertise
Localization, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$299
|
Standard
$599
|
Advanced
$999
|
|---|---|---|---|
| Delivery Time | 1 day | 3 days | 5 days |
Number of Revisions | 1 | 2 | 3 |
Design Customization | |||
Content Upload | |||
Responsive Design | |||
Source Code |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$100 - $300
Additional Revision
+$200
Additional Page
(+ 5 Days)
+$200
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CM
Crystal M.
Aug 1, 2026
Educational Feature Pointers Platform Quick-Reply Buttons
Olyad did an excellent job developing and improving our platform. He handled complex automation, support-chat workflows, API integrations, and gaming-platform features with great attention to detail. He communicated clearly, understood our requirements, and remained solution-oriented whenever challenges came up. He was accountable for the final results and committed to delivering quality work. I highly recommend Olyad to anyone looking for a dependable and skilled developer.
CM
Crystal M.
Jul 31, 2026
Tournaments
Olyad did an excellent job. He was professional, dependable, and committed to delivering quality work. He communicated clearly, paid close attention to details, and worked hard to find solutions whenever an issue came up. I appreciate his accountability and dedication throughout the project and would recommend him to other clients.
JS
Jacob S.
Jul 30, 2026
NearUS – Security Fixes & Bug Fixes (Pre-Launch)
CM
Crystal M.
Jul 18, 2026
Spend the wheel
Olyad was a pleasure to work with from start to finish. He communicated clearly throughout the project, paid attention to every detail, and consistently delivered high-quality work. He was responsive to feedback, solved problems quickly, and made sure everything was completed exactly as requested. His technical skills and professionalism exceeded my expectations, and I would not hesitate to hire him again for future projects. I highly recommend Olyad to anyone looking for a reliable, talented, and dedicated developer.
CM
Crystal M.
Jul 16, 2026
Pawnshop Trade Restrictions & Video Upload Compression
Olyad was excellent to work with from start to finish. Communication was clear, they paid close attention to detail, and consistently delivered high-quality work. They were responsive, solution-oriented, and took ownership of the project to make sure everything was completed correctly. I would definitely work with Olyad again and highly recommend them to anyone looking for a reliable and skilled freelancer.
About Olyad
Senior Backend Engineer | Node.js, NestJS, Payment API Integration
100%
Job Success
Addis Ababa, Ethiopia - 3:00 am local time
Node.js, NestJS, TypeScript, PostgreSQL, React, JavaScript, Supabase, AWS Certified DevOps Engineer Professional
WHERE BACKENDS QUIETLY BREAK
A webhook fires twice and you charge the customer again. A provider times out mid-transaction and your PostgreSQL database and theirs disagree about what happened. A rate limit hits during your busiest hour.
Most backends handle the happy path and hope. I build the failure path first: idempotency keys, retries with exponential backoff, dead letter queues, and reconciliation jobs that catch what slipped through. Your Node.js or NestJS system degrades gracefully instead of losing state.
30+ five-star contracts completed on Upwork across fintech, healthcare, and SaaS platforms.
PAYMENT AND API INTEGRATION
Reduce failed transactions and make every payment auditable.
Stripe integration, subscriptions, webhooks, and reconciliation
Ledger logic and auditable transaction flows
OAuth2, Google Sign-In, and social authentication
REST and GraphQL API design and API integration
CRM, messaging, and cloud storage integrations
BACKEND AND FULL STACK ENGINEERING
Ship faster now without paying for it in maintenance later.
NestJS and Node.js backend development
React and Next.js frontend integration
Multi-tenant SaaS architecture with RBAC and JWT auth
PostgreSQL schema design, query optimization, and Redis caching
MongoDB and MySQL database design
PHP and Laravel backend development
Microservices and event-driven systems with Kafka and RabbitMQ
Real-time features with WebSockets and background job queues
AWS deployment, Docker, and CI/CD pipelines
Vercel and Supabase deployment
AI INTEGRATION
Add AI features to a web application already in production, without destabilizing it.
OpenAI API and Anthropic Claude API integration
AI chatbots and assistant backends
Streaming responses, function calling, and tool use
Token cost control and prompt management
Retrofitting AI into an existing Node.js or NestJS application
CREDENTIALS
AWS Certified DevOps Engineer Professional
AWS Certified Developer Associate
AWS Certified Cloud Practitioner
Software Engineer at a production payment processor, 2025 to 2026
WHO I WORK WITH
Fintech teams needing secure payments and auditable transaction flows
SaaS companies whose API layer or web application has become a maintenance problem
Startups adding AI features or new API integrations to an existing product
CTOs and technical leads who want tested code, clear updates, and a clean handover
Available for ongoing engagements and long-term backend ownership, not just one-off tickets.
TECH STACK
Backend: Node.js, NestJS, Express, TypeScript, PHP, Laravel, Python, FastAPI
Frontend: React, Next.js, JavaScript, TypeScript, Tailwind CSS
Databases: PostgreSQL, MongoDB, MySQL, Redis
ORM and BaaS: Prisma, TypeORM, Supabase
Payments: Stripe, Paystack, Flutterwave
APIs: REST, GraphQL, Webhooks, API Integration
Auth: JWT, OAuth2, RBAC
Cloud and DevOps: AWS, Docker, CI/CD, Vercel
AI: OpenAI API, Anthropic Claude API
Testing: Unit, integration, end to end
LET'S TALK
Send me a short description of what you are building and the constraints you are working under. I respond within four hours and will tell you honestly whether I am the right fit.
Steps for completing your project
After purchasing the project, send requirements so Olyad can start the project.
Delivery time starts when Olyad receives requirements from you.
Olyad works on your project following the steps below.
Revisions may occur after the delivery date.
Requirements Review
Review your requirements, existing codebase if any, and define the API endpoints and data models before writing any code.
Architecture Design
Design the database schema, API structure, authentication flow, and folder structure so everything is planned before implementation begins.