You will get I will develop a 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 |
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DS
David S.
Jun 5, 2026
Mobile App Development for Android and iOS
Sergei has been terrific to work with. He has been able to problem solve when issues arise and had some great ideas to help shape the outcome of the project. I will happily continue working with Sergei on this project, and future projects. Sergei has been someone that can problem solve, bring fresh ideas to the table and holds himself accountable for the work he does.
IK
Igor K.
Jan 23, 2026
Simple Task Tracker App
Sergei was fantastic to work with! He delivered the task tracker app on time, with excellent quality and attention to detail. His proactive communication, clear explanations, and smart recommendations made the whole process seamless. The code is clean, well-structured, and maintainable. I truly appreciated his initiative and professionalism—highly recommend for any React Native project!
About Sergei
Full-Stack Developer | Web & Mobile Apps | US-Based
83%
Job Success
San Francisco, United States - 6:54 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