Startups and enterprises migrating from legacy OpenAI Assistants threads to the new OpenAI Responses API, OpenAI Agents SDK, Structured Outputs, Realtime WebRTC Audio API, and `o3-mini` / `gpt-4o` reasoning pipelines frequently search to hire a freelance OpenAI API programmer. I am Aldian Fazrihady, a Senior Freelance AI Application Engineer and Full Stack Programmer.
Core OpenAI Platform & Agent Engineering Capabilities
- OpenAI Responses API & Agents SDK Orchestration: Building multi-agent handoffs, input/output guardrails, built-in web/file search tools, and OpenTelemetry tracing in Python and TypeScript.
- 100% Deterministic Structured Outputs (`strict: true`): Enforcing constrained context-free grammar decoding so every LLM response conforms 100% to your Pydantic or Zod schema.
- OpenAI Realtime API over WebRTC: Engineering browser and mobile voice companions with sub-400ms speech-to-speech latency and live tool calling.
Frequently Asked Questions
Should we migrate from the OpenAI Assistants API to the new Responses API or custom pgvector RAG?
Yes. Migrating to the Responses API or a PostgreSQL `pgvector` pipeline gives you full control over chunking, hybrid BM25 + vector ranking, metadata filtering, and substantially lower per-query storage and retrieval costs.
How do I hire you as a freelance OpenAI programmer?
Hire me via Upwork.