Hire senior OpenAI developers for production apps and agents
Senior engineers who build on the OpenAI platform: the Responses API, function calling, structured outputs, the Agents SDK and realtime voice.
By the Ryz Labs team · Updated October 2026
Hiring OpenAI developers through Ryz gets you senior Latin American engineers who build production systems on the OpenAI platform, from function calling and structured outputs to agents and realtime voice. They are the top 1% of the engineers we interview, and they work on your team and in your repos, working within an hour of US time zones.
What our OpenAI developers work on
The OpenAI platform has moved quickly. The Responses API is now the main interface for model calls and built-in tools, the Assistants API was shut down in August 2026, and agents are built with the Agents SDK or your own orchestration. Our developers work across that surface, on OpenAI directly or through Azure. Typical projects:
- Migrating Assistants API code, threads and file search setups to the Responses and Conversations APIs.
- Customer support and internal help agents built with the Agents SDK, using handoffs between specialized agents, guardrails and tracing.
- Structured extraction from invoices, claims or forms with strict JSON schema outputs feeding downstream systems.
- Retrieval with the built-in file search tool or your own vector store, depending on control and data residency needs.
- Voice agents on the Realtime API over WebRTC, WebSocket or SIP.
- Bulk jobs on the Batch API and model routing that sends easy requests to cheaper models.
Skills we vet for
- Responses API. Stateful conversations with previous_response_id or the Conversations API, built-in tools, streaming events and background mode for long tasks.
- Function calling. Tool schemas with strict mode, parallel calls, validating arguments before execution and returning errors the model can use.
- Structured outputs. JSON schema design that the model can actually fill, and fallbacks when a field is genuinely unknown.
- Agents SDK. Agents, handoffs, guardrails, sessions and tracing, plus knowing when a plain loop is simpler.
- Remote MCP and built-in tools. Connecting MCP servers, web search, file search and code interpreter, with approval settings for risky tools.
- Cost and latency. Model selection, reasoning effort settings, prompt caching behavior, the Batch API and rate-limit handling with backoff.
- Fine-tuning tradeoffs. Supervised fine-tuning and distillation through the API, and the evidence needed before choosing it over better prompts.
- Safety. The Moderation API, prompt injection defenses and limiting what tools can touch.
How we vet OpenAI developers
Recruiters source engineers with production OpenAI work behind them, then our in-house ARC system ranks the pipeline. Candidates complete structured NTRVSTA AI interviews on API design, agent failure modes and cost tradeoffs. Recruiters review each candidate before and after and send you a curated shortlist. AI scores are advisory. Humans decide.
Sample interview topics
- You are migrating an Assistants API app with thousands of active threads. How do you move conversation state and file search to the Responses API without losing context for users?
- A function call returns arguments that pass the schema but reference a customer ID that does not exist. Where do you catch it, and what do you send back to the model?
- Design a triage agent that hands off to billing and technical agents. How do you keep context consistent across handoffs, and how do you test it?
- Your p95 latency doubled after switching to a reasoning model. What do you measure, and which levers do you try first?
- A stakeholder wants to fine-tune to fix tone. What evidence would you collect before agreeing?
Ways to hire OpenAI developers
| Option | Best for | Trade-offs |
|---|
| Freelance marketplace | A prototype chatbot or one integration | Many profiles predate the Responses API. You vet for current platform knowledge yourself. |
| Staffing or recruiting agency | Volume sourcing for a defined role | Screens tend to check keywords, not whether someone can debug an agent trace. |
| In-house recruiting | Long-term ownership of your AI platform | Long cycles in a competitive market, and your senior engineers run the interviews. |
| Ryz Labs staff augmentation | Adding OpenAI experience to a team that already ships product | You set priorities and review the code. Works best with a clear roadmap. |
| Ryz Labs AI pod team | A complete OpenAI-based system built inside your cloud | A dedicated pod with a tech lead and ML and backend engineers, scoped up front, with weekly demos. |
Skip Ryz if you want self-serve hourly freelancers you can book without a call, or a licensed AI platform instead of engineers. Teams that need people in European or Asian time zones should look at global networks.
Why hire OpenAI developers from Latin America
OpenAI ships platform changes often, and every change raises a decision: migrate now, test the new model, or wait. Engineers who work your hours can run the comparison, show results in the afternoon review and get a decision the same day instead of a week of async back-and-forth.
Latin America has a deep bench of senior backend engineers who have worked with US product teams for years. Most of an OpenAI integration is API design, queues, retries and data handling, which is exactly where that experience pays off. They communicate in English and are used to explaining tradeoffs to product and legal reviewers.
Related roles
FAQ
We still have code on the Assistants API. Can you help?
Yes. The Assistants API was shut down on August 26, 2026, so any remaining calls need to move. Our developers port assistants, threads and file search to the Responses and Conversations APIs and test the results against your old outputs.
Do you work with OpenAI directly or through Azure?
Either. Many enterprises use OpenAI models through Azure for network and identity controls. The code is largely the same; the deployment and governance setup differs.
What does it cost?
We give a custom quote, scoped per team. You see a plan, a price and the names of the engineers before you sign anything.
How much time-zone overlap do we get?
They keep hours within an hour of US time zones, including New York hours. Ryz engineers work on your team, reporting to your leads. Talk to us to scope your team.
Questions we didn't answer? Email info@ryzlabs.com.