Tech Lead - Product

FortyFive; Mountain View (CA); On-site; USD 150,000 - 200,000; Full time

Job summary

FortyFive in Mountain View, California, is seeking a Tech Lead to architect and lead the development of their GenAI-powered simulation and visualization platform. This role involves making critical technical decisions, mentoring engineers, and integrating ML models into products. Applicants should have 7+ years of software engineering experience, strong product intuition, and experience with 3D graphics and simulation systems. The company values communication and proactive collaboration across diverse teams.

Qualifications

• 7+ years of software engineering with 2+ years in technical leadership.
• Deep product intuition regarding tool usability.
• Strong ML fundamentals and product integration skills.

Responsibilities

• Lead technical architecture for simulation and visualization products.
• Make build-vs-buy decisions and technology selection.
• Mentor and grow a team of graphics and simulation engineers.
• Drive ML solution architecture that bridges research and product.
• Hands-on coding for critical systems and complex integrations.

Skills

Software engineering

Technical leadership

3D graphics

ML model integration

Communication

Tools

MuJoCo

Isaac Sim

Physics engines

Job description

Join Us in Building the Future of Physical AI

We build the simulation infrastructure for physical AI. We develop GenAI-powered tools that enable robotics teams to create unlimited, diverse training data and realistic evaluation environments. Our team spun out of MIT CSAIL, where we pioneered techniques that trained robots using only synthetic data. We’re helping robotics companies transition to AI-native development workflows.

We’re a lean team of researchers and engineers from DeepMind, OpenAI, FAIR, and top universities including MIT, Berkeley, Caltech, Harvard, and Yale. We’ve published best papers at top robotics conferences, won International Olympiad medals, and built core systems at leading AI labs. We believe in building complex systems that bring simplicity to our customers.

Global Team: We operate across US and China time zones. We value people who communicate proactively, document thoroughly, and take ownership of smooth handoffs across teams.

What to Expect

As Tech Lead for our Product team, you will architect and lead development of our GenAI-powered simulation and visualization platform. You’ll make critical technical decisions, mentor engineers, and ensure we’re building systems that scale.

What You’ll Do

• Lead technical architecture for simulation and visualization products
• Make build‑vs‑buy decisions and technology selection
• Mentor and grow a team of graphics and simulation engineers
• Drive ML solution architecture that bridges research and product
• Hands‑on coding for critical systems and complex integrations

What You’ll Bring

• 7+ years of software engineering with 2+ years in technical leadership
• Deep product intuition—you understand what makes tools usable
• Experience with 3D graphics, game engines, or simulation systems
• Strong ML fundamentals; ability to integrate ML models into products
• Excellent communication and ability to translate technical concepts

Nice to Have

• Experience at game studios, simulation companies, or graphics vendors
• Background in robotics visualization or digital twins
• Familiarity with MuJoCo, Isaac Sim, or physics engines

We believe diverse teams build better products. Even if you don’t meet every requirement listed, we encourage you to apply if you’re excited about this role and our mission.