You will get a custom REST API built with Node.js, Express, and TypeScript
Rising Talent
Project details
I build custom REST APIs with Node.js, Express, and TypeScript — the same stack I used to build Spring (getspring.io), a production SaaS platform for sales commission management. Every API I deliver comes with clean, typed code, PostgreSQL database with Prisma ORM, proper error handling, input validation, and documentation. I've built OAuth integrations with QuickBooks and Google, JWT authentication systems, and role-based access control — all running in production on AWS. You get production-quality code, not a prototype.
Programming Languages
JavaScript, TypeScriptCoding Expertise
Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$150
|
Standard
$350
|
Advanced
$750
|
|---|---|---|---|
| Delivery Time | 4 days | 7 days | 14 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.
Additional Revision
+$25Frequently asked questions
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UO
Uri O.
Apr 10, 2026
AI Developer for Financial and Customer Management Tools
Fabulous brilliant hard working and diligent fullstack engineer will work with Sos again soon.
About Sos
Node.js/TypeScript API Developer | SaaS Backends, REST APIs & OAuth
Lviv, Ukraine - 4:27 pm local time
I'm the founder and sole developer of Spring — a SaaS platform for sales commission management. I built the entire backend from scratch: REST APIs with Express.js and TypeScript, PostgreSQL database with Prisma ORM, JWT + OAuth authentication, role-based access control, and integrations with QuickBooks, Google Sheets, Notion, and CRM systems. The platform runs in production on AWS.
What I'm best at:
→ Backend development: Node.js, Express.js, TypeScript, PostgreSQL, Prisma
→ API design and third-party integrations (CRM, payment, productivity tools)
→ Authentication systems (JWT, OAuth 2.0, RBAC)
→ Database architecture and optimization
→ Deployment on AWS (EC2, PM2, custom deploy pipelines)
I also work across the full stack when needed — my product's frontend runs on Next.js 14, React, Redux Toolkit, and Tailwind CSS.
What makes me different: I come from a professional design background (4+ years), so I don't just write code that works — I build products that make sense to users. I understand UI/UX deeply and can bridge the gap between design and development.
I hold a Bachelor's degree in Computer Science from European University in Lviv.
Languages: English (fluent), Spanish, German, Russian, Ukrainian, Armenian.
I'm responsive, detail-oriented, and I treat every project like it's my own product.
Steps for completing your project
After purchasing the project, send requirements so Sos can start the project.
Delivery time starts when Sos receives requirements from you.
Sos works on your project following the steps below.
Revisions may occur after the delivery date.
Project scoping
Review requirements, clarify endpoints, define database schema, agree on timeline
Database and project setup
Set up TypeScript project, configure PostgreSQL with Prisma, create migrations