You will get Third-Party API Integration for Your Node.js Backend
Rising Talent
Project details
I connect third-party APIs to your existing backend — payment systems, CRMs, Google Sheets, QuickBooks, scheduling tools, or any service with a REST API.
I built Spring (getspring.io), a production SaaS platform that integrates with QuickBooks, Google Sheets, and Google OAuth. So this isn't theory — I've built, deployed, and maintained real API integrations that handle live data every day.
Every integration includes secure authentication setup, proper error handling, retry logic for failed requests, rate limiting to stay within API limits, and clear documentation so your team knows exactly how everything works.
Stack: Node.js, TypeScript, Express, PostgreSQL
I built Spring (getspring.io), a production SaaS platform that integrates with QuickBooks, Google Sheets, and Google OAuth. So this isn't theory — I've built, deployed, and maintained real API integrations that handle live data every day.
Every integration includes secure authentication setup, proper error handling, retry logic for failed requests, rate limiting to stay within API limits, and clear documentation so your team knows exactly how everything works.
Stack: Node.js, TypeScript, Express, PostgreSQL
Programming Languages
JavaScript, TypeScriptCoding Expertise
SecurityWhat's included
| Service Tiers |
Starter
$150
|
Standard
$300
|
Advanced
$500
|
|---|---|---|---|
| Delivery Time | 3 days | 5 days | 7 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
+$50 - $100Frequently 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
Dos Hermanas, Spain - 5:33 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.
API Review & Planning
I review the API docs, define which endpoints we need, map out the data flow, and confirm everything with you before writing any code
Authentication & Connection
Set up secure authentication (OAuth, API keys, or tokens depending on the service) and verify the connection is working