OpenAI/GPT Development Partners
OpenAI's GPT-4o, o1, and o3 models are the most capable large language models available in 2026, powering everything from chatbots and code generation to complex reasoning systems. Building production AI applications with the OpenAI API requires expertise in prompt engineering, retrieval-augmented generation (RAG), function calling, and cost optimization. HyperNest Labs has shipped AI products using OpenAI APIs to production across healthcare, SaaS, and consumer applications. Hire senior OpenAI/GPT engineers and fractional CTOs who ship production-grade code and mentor your team.
What We Build with OpenAI/GPT
Production Applications
Ship production-grade OpenAI/GPT applications with proper architecture, testing, and deployment pipelines from day one.
API Development
Build scalable APIs and integrations with OpenAI/GPT that handle enterprise workloads and third-party systems.
Performance Optimization
Optimize existing OpenAI/GPT codebases for speed, reliability, and maintainability as you scale.
Architecture Review
Get expert review of your OpenAI/GPT architecture with recommendations for scaling and technical debt reduction.
Team Augmentation
Add senior OpenAI/GPT engineers to your existing team who mentor junior developers while shipping features.
Migration & Modernization
Migrate to OpenAI/GPT from legacy systems or modernize existing OpenAI/GPT applications.
OpenAI/GPT Engineering Services
From fractional CTO leadership to embedded OpenAI/GPT engineers, we scale with your needs.
Fractional CTO
Technical leadership with deep OpenAI/GPT expertise. Architecture, team building, and strategic guidance.
Learn more →⚡Founding Engineers
Senior OpenAI/GPT developers who embed in your team and ship production code from week one.
Learn more →🤖AI/LLM Integration
Add AI capabilities to your OpenAI/GPT application. Copilots, automation, and intelligent features.
Learn more →What We've Built
Rupa Health
$100K→$5M ARRFractional CTO from Seed to Series A, scaling ARR from $100K to $5M.
Read case study →
Dromo
0→1 to ScaleFounding engineer from 0→1 to enterprise-scale data platform.
Read case study →
OddsJam
AcquiredTechnical due diligence that unlocked acquisition by Gambling.com.
Read case study →“Aravind is in the top 1% of engineers I've hired. He supported us from $100K to $5M ARR, keeping us shipping through crazy growth and investor scrutiny.”
OpenAI/GPT Development FAQs
What OpenAI/GPT experience does HyperNest have?
Our engineers have shipped production OpenAI/GPT code at scale across healthcare, fintech, SaaS, and other industries. We bring senior-level expertise with years of hands-on OpenAI/GPT development experience.
Can you work with our existing OpenAI/GPT codebase?
Absolutely. We specialize in joining existing teams and codebases. Our engineers quickly get up to speed on your OpenAI/GPT architecture and start contributing value from week one.
Do you offer OpenAI/GPT consulting or full development?
Both. Our fractional CTOs provide OpenAI/GPT architecture guidance and technical leadership. Our founding engineers embed in your team for hands-on OpenAI/GPT development. Many engagements combine both.
How do your OpenAI/GPT engineers compare to freelancers?
Unlike freelancers, our OpenAI/GPT engineers embed as founding team members with outcome ownership. They attend your standups, join your Slack, and ship like your first 5 engineers—not hourly contractors.
Can you help us migrate to/from OpenAI/GPT?
Yes. We've helped companies migrate legacy systems to OpenAI/GPT and also transition away when needed. Our engineers bring experience with gradual migration strategies that minimize risk.
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Ready to build with OpenAI/GPT?
Let's discuss your OpenAI/GPT engineering needs and how we can help.
Not ready to book yet?
Send a quick note and we'll follow up within a few hours.