Synthetic Data Engineer

Department: Engineering

Location: San Francisco Office

Employment Type: FullTime

TypeSafe is a frontier model lab. We build reliable and general AI systems to power economically valuable automation. Our mission is to usher in a new era of Transformative Artificial Intelligence (TAI): technology with the power to drive a societal shift on the scale of the agricultural and industrial revolutions.

While others chase benchmarks and academic puzzles, we’ve been quietly rethinking the LLM stack from first principles — building a new kind of general frontier model designed for real-world reliability, decision-making, and autonomy in production.

We’re a small, fast-moving team from OpenAI, Google Brain and Meta/FAIR, backed by top-tier investors. Since mid-2024, we’ve been engineering the foundation for what comes after the current “state-of-the-art” — a model that actually gets things done.

About the Role

As a technical prompt engineer, you will support the core training stack of our models with a combination of data science, creativity, and engineering skills. You’ll be part of the real ‘secret sauce’ of TypeSafe, figuring out how our models can provide production-ready reliability in the real world.

Responsibilities: On a day to day level, you might

• Design and build reliable, production-grade AI systems that integrate large language models and our proprietary models into real-world workflows

• Create high-leverage datasets, products, and user interfaces that unlock new capabilities and use cases on top of our model

• Run rigorous analyses and experiments to understand how data, training choices, and targeted interventions impact model behavior and performance

• Develop and own evaluation frameworks to measure quality, reliability, and emergent characteristics across model iterations

• Partner closely with product managers and customers to translate real-world needs into concrete model and system improvements

• Continuously iterate, learn, and co-discover new techniques for building exceptional, trustworthy AI product

Our tech stack is primarily Python. We also use TypeScript, Next.js, and Tailwind CSS for frontend, with Kubernetes for orchestration. We empower developers to use any tooling they find helpful for getting their job done, including Claude Code and Cursor.

We are looking for people who:

• Have 5+ years of professional software engineering, or equivalent professional expertise

• Have strong coding ability and product intuition

• Enjoy thinking beyond the code to how systems are used in the real world

• Maintain high attention to detail and a strong bar for quality

• Can describe complex problems succinctly and clearly

• Care deeply about our mission and are driven to translate it into real-world impact

• Thrive in ambiguous problem spaces and take satisfaction in finding creative solutions

• Have hands-on experience implementing LLMs and understand their capabilities and limitations

Life at TypeSafe

We’re a small, flat, close-knit team dedicated to real-world impact preparing the world for Transformative AI. Our team works fully in-person in our San Francisco office near Embarcadero station. We love what we do and care about our work a lot.

We strive for excellence and craftsmanship and won't stop until we get there. When the team wins, we all win, and we enjoy collaborating and inspiring each other to grow as a team and as individuals.

We also value emotional honesty, kindness, and bringing your whole self to work. We build machines; we don't try to be machines.

We want you to be able to do the most impactful work of your career at TypeSafe and help define our future as a company.

We provide

- Competitive salary and equity

- 100% covered health insurance

- Daily lunch and dinner

- Visa sponsorships

- 401K plans