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I will integrate the openai or anthropic API into your app
Matheus L
About this gig
Already have an app and want to add AI? I integrate the OpenAI (GPT) or Anthropic (Claude) API into your existing product cleanly, securely, and with cost control.
Senior software engineer (8+ yrs) with real production experience in LLM integrations.
WHAT YOU GET:
- AI feature integrated into your backend (Python/FastAPI, Java/Spring, Node)
- Prompt orchestration + error handling + retries
- Usage and cost monitoring
- Streaming responses (optional)
- Clean, documented code you fully own
WHY ME:
Production experience, not just demos. I focus on secure, maintainable integrations and keeping your API costs under control.
Message me with your stack and goal before ordering I'll confirm scope and timeline. All work handled in writing, no calls needed.
Get to know Matheus L
Matheus L
Senior Software Engineer AI Specialist
- FromBrazil
- Member sinceJun 2026
- Avg. response time1 hour
Languages
English, Portuguese
I am a software engineer with over 8 years of experience working at the intersection of software engineering and AI. I specialize in building robust systems with Java/Spring Boot and integrating AI via RAG pipelines, autonomous agents, and LLM automation. I have a strong analytical background in Electrical Engineering and currently lead ALTOSOFT to help companies modernize legacy systems and implement intelligent digital products.
Other AI Development Services I Offer
FAQ
Do we need a call?
No. Everything is handled here in writing, so we always have a clear record. Send me your stack and goal in the chat and I'll confirm scope before we start.
Which API do you integrate — OpenAI or Anthropic?
Both. I'll recommend the best fit for your use case and budget (GPT or Claude). You keep your own API key and pay provider costs directly.
Are the API usage costs included?
No. My price covers the integration work. The AI provider bills usage to your own account. I set things up to keep your costs low and predictable.
What stacks do you work with?
Python/FastAPI, Java/Spring Boot, and Node. If you're unsure, tell me your setup and I'll confirm compatibility before you order.
Do I own the code?
Yes, 100%. You get the source code and full access — no lock-in, no dependency on me to keep it running.
Can you add AI to an app that already exists?
Yes — that's exactly what this service is for. I integrate into your current backend without rewriting what already works.
