Member of Technical Staff (Models)
About Jarmin
Jarmin builds AI Employees for human-level roles. An AI Employee learns its responsibilities, understands your data, embeds into your systems, and becomes part of your team's day-to-day workflow. Companies hire AI ML Engineers, Account Executives, Paralegals, Financial Analysts, Compliance Analysts, and more.
Our founding team is from Meta Superintelligence Labs (Staff Engineers), Apple (Machine Learning), AWS (scaling infrastructure), Lockheed Martin (Research), and JPMorganChase, with experience building AI and ML systems and automating the complex work of researchers, data scientists, and ML engineers.
We are a Y Combinator Fall 2025 company in San Francisco.
About the role
As a Member of Technical Staff on Models, you'll own the post-training loop that improves the performance of our AI Employees. You will be defining how we train models to do mission critical work in the real world.
Areas you may work in
Post-training and fine-tuning
Turning agent traces and expert feedback into training data
Reward modeling and graders for non-verifiable outcomes
Distillation into smaller, faster, cheaper models
Designing and running training experiments
You may be a good fit if you
Have trained or fine-tuned models and shipped the result into a product
Have hands-on experience with SFT, preference optimization, or RLHF
Can read traces and tell whether a metric measures the thing that matters
Have strong software engineering fundamentals alongside ML depth
Want to work in person in San Francisco
Even better
You've adapted open-weight models to a specialized domain
You've built training data or evaluation infrastructure
You contribute to open source projects
How we work
Our core team is in person, resourceful, and building the future we want to live in.
We give feedback early and often, so you always know where you stand and where you're headed.
Interested?
If you have a question before applying, write to careers@jarmin.ai.