You will get REST or GraphQL API for your application (17)
Project details
I will develop a professional REST or GraphQL API for your application with clean code and best practices. With expertise in Python, Node.js, and TypeScript, I create scalable and secure backend solutions. Services include database integration, authentication, API documentation, and comprehensive testing. Perfect for startups and established businesses needing reliable backend infrastructure.
Programming Languages
JavaScript, Python, TypeScriptCoding Expertise
Performance Optimization, Security, DesignWhat's included
| Service Tiers |
Starter
$49
|
Standard
$149
|
Advanced
$249
|
|---|---|---|---|
| Delivery Time | 5 days | 7 days | 10 days |
Number of Revisions | 2 | 3 | 5 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code |
7 reviews
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TL
Tanya L.
Aug 15, 2026
Tester needed with Android to submit closed testing in Google Play Store
FJ
Felix J.
Aug 15, 2026
Full-Stack Web Developer for New Features
I had a great experience working with this developer. They understood the new features I needed, communicated clearly throughout the project, and handled the work professionally. Everything was completed smoothly, and the final result worked exactly as expected. I’d definitely be happy to work with them again.
RB
Roberts B.
Aug 15, 2026
Mobile App Bug Fixer Needed (iOS/Android)
Working with Sergei was great, he's very detailed oriented and a creative person!
SJ
Specimen J.
Jul 13, 2026
Small fix in my mobile app (Expo / React Native)
Great experience overall. Responsive and beyond expectations. Thank you
FC
Feng Lin C.
Jul 7, 2026
Automate Daily Data Pull
Great experience! Clear communication, fast feedback, and a respectful collaboration throughout the project. I really appreciated the trust and the smooth workflow. Would definitely work together again!
About Sergei
Full-Stack Developer | Web & Mobile Applications | React Native
91%
Job Success
San Francisco, United States - 5:57 am local time
In the past year I've shipped 5 products end-to-end:
• ChekBack - a receipt-cashback app
• PhotoOffice - an AI passport-photo service
• ChessTourism - a chess-tournament platform
• Pluto - a field-service management system for home-service companies
• MotoSocial - a social network for motorcyclists
Each one went from concept to deployment, including auth, payments, integrations, and infrastructure.
Why clients work with me:
• US-based, real-time overlap with your business hours
• Native, clear English on calls and in writing
• Senior delivery - I ship working software, not just plans
• I stay with you until your app is published - I never leave you alone with your issues or concerns
• Warranty after delivery - if something breaks on my work, I fix it, no extra charge
Core stack: React, React Native, Next.js, TypeScript, Node.js, PostgreSQL.
Also: Python (FastAPI/Django), Expo, Redis, AWS/Hetzner/Cloudflare, CI/CD, REST & GraphQL, CRM and third-party integrations.
Best fit for: founders and startups who need an MVP or full product built right, the first time.
Send me your idea and I'll reply with a rough scope and timeline. No charge.
Steps for completing your project
After purchasing the project, send requirements so Sergei can start the project.
Delivery time starts when Sergei receives requirements from you.
Sergei works on your project following the steps below.
Revisions may occur after the delivery date.
Requirements gathering and planning