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I will integrate any third party API into your node js backend
Yaroslav Z
About this gig
Need a third-party API integrated into your backend - cleanly, reliably, and without breaking in production? That's what I do.
I'm a full-stack engineer with 3 years of production experience and 8+ API integrations shipped on a live ad-tech SaaS, plus two open-source AI tools built end-to-end.
WHAT I CAN INTEGRATE:
- Any REST or GraphQL API
- AI / LLM providers (OpenAI, Claude, Gemini)
- Payment, CRM, analytics, or ad-network APIs
- Webhooks and data-sync flows
WHAT YOU GET:
- Clean, well-structured Node.js / NestJS / TypeScript code
- Proper authentication, error handling, retries, and rate-limit management
- Tests so the integration holds up
- Source code included
HOW I WORK: I use AI tools to move fast, but I'm careful about what ships - especially anything touching security or data integrity. If I can't explain a line, it doesn't go in.
Not sure which package fits? Message me with your use case and I'll tell you honestly what's realistic - before you order.
Let's build something reliable.
Get to know Yaroslav Z
Yaroslav Z
FullStack Engineer
- FromPoland
- Member sinceJun 2026
- Avg. response time1 hour
Languages
English, Russian, Ukrainian, Slovak
I'm a Full-Stack Engineer with 3 years of production experience in TypeScript, Node.js/NestJS, and React. I specialise in third-party API and AI/LLM integrations — connecting external services, payment/CRM/ad APIs, and AI providers (OpenAI, Claude, Gemini) into real applications.
I spent 3 years building an ad-tech SaaS product with 8+ API integrations, and recently shipped two open-source full-stack AI tools end-to-end. I focus on clean, reliable integration work that holds up in production.
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FAQ
Can you integrate an API that isn't listed?
Almost certainly yes. If it has REST or GraphQL endpoints and documentation, I can integrate it. Message me the API and I'll confirm before you order.
Do I need to provide API keys or credentials?
Yes - you'll provide the API keys/credentials for the services being integrated. I handle them securely and never hard-code secrets.
Can you work with my existing codebase?
Yes. I can integrate into an existing Node.js / NestJS / TypeScript project, or build the integration as a standalone module.
