You will get third-party REST API integrated into your React or Next.js app
Rising Talent
Rising Talent
Project details
Need to connect your React or Next.js app to a third-party API and don't want to spend a week reading docs? I'll handle it. Stripe, OpenAI, Anthropic Claude, Firebase, Supabase, Google APIs, Meta APIs, or any REST endpoint with public documentation.
What sets me apart: I integrate APIs every day as part of my work on multi-service AI systems. Aegis, my clinical AI platform, orchestrates four third-party services concurrently with automatic failover, Zod validation at every boundary, and structured error handling. That is the level of care I bring to your single integration.
You get: a clean typed API client, full error handling and loading states, environment variable setup with docs, one working example wired into your UI, and a short walkthrough of how to extend the integration later.
I handle the right auth pattern for your API (API key, OAuth, Bearer token), rate limits, edge cases, and the inevitable quirks that every real API has. If your API has gotchas, I will tell you upfront before writing code.
Fast delivery, production-quality work, and clear communication. I will not start coding if the scope is larger than the tier you picked. You will always get a quote first.
What sets me apart: I integrate APIs every day as part of my work on multi-service AI systems. Aegis, my clinical AI platform, orchestrates four third-party services concurrently with automatic failover, Zod validation at every boundary, and structured error handling. That is the level of care I bring to your single integration.
You get: a clean typed API client, full error handling and loading states, environment variable setup with docs, one working example wired into your UI, and a short walkthrough of how to extend the integration later.
I handle the right auth pattern for your API (API key, OAuth, Bearer token), rate limits, edge cases, and the inevitable quirks that every real API has. If your API has gotchas, I will tell you upfront before writing code.
Fast delivery, production-quality work, and clear communication. I will not start coding if the scope is larger than the tier you picked. You will always get a quote first.
Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$175
|
Standard
$350
|
Advanced
$650
|
|---|---|---|---|
| Delivery Time | 3 days | 5 days | 8 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
+$80 - $300
Additional Revision
+$75Frequently asked questions
About Giannis
Full-Stack Developer | React, Next.js, Node.js | FHIR
Athens, Greece - 8:20 pm local time
Full-stack development of PoCs and production-ready applications.
What you get is a developer who has shipped production-grade applications and will treat your $400 job with the same care as a $40,000 one.
Recent work:
Aegis (aegis-ai-cds.vercel.app) - A clinical AI decision support platform I built independently. Multi-model AI pipeline with automatic failover when one model hits its rate ceiling, RAG via Supabase pgvector for semantic search, live API evidence grounding, Zod validation on every boundary, structured audit logging. Built the Next.js version first, then rebuilt the entire backend in Ruby on Rails over a weekend to benchmark both architectures.
FHIR Pulse (fhir-dashboard-five.vercel.app) - Real-time data dashboard pulling live API data through a Node.js Express proxy on AWS with server-side transformation, reducing client payload by 30%.
Summarist (yiannis-summarist.vercel.app) - Full-stack SaaS with Firebase Auth, session management, Stripe-style subscription gating, and tier-based feature access.
What I do well:
React, Next.js, TypeScript, Node.js, Express
REST API integration (Google, Meta, Stripe, Firebase, Supabase, OpenAI, Anthropic Claude, Gemini)
AI integration: chatbots, RAG pipelines, LLM orchestration, prompt engineering
Supabase, Firebase, PostgreSQL
Rapid prototyping and MVP delivery
Production bug fixes and code reviews
Background: Ten years as an ICU and ER nurse before engineering, which means I understand what it costs when software fails under pressure. Dual US and Greek citizen operating through a US LLC, no sponsorship or contractor paperwork needed. Based in Athens, Greece, fully available during US Eastern business hours for async and live collaboration.
Available immediately. I respond to messages within a few hours during weekdays.
Steps for completing your project
After purchasing the project, send requirements so Giannis can start the project.
Delivery time starts when Giannis receives requirements from you.
Giannis works on your project following the steps below.
Revisions may occur after the delivery date.
Review project and API docs
Clone your repo, read the target API documentation, and confirm the integration approach before writing any code. I will flag any constraints or gotchas I see upfront.
Build the API client
Write a clean, typed API client with authentication, error handling, rate limit awareness, and loading state management. Tested against the live API.