Full-Stack Software Engineer

About Tacit

We are an early-stage, deep tech startup based in San Francisco, developing innovative hardware that rethinks human-computer interaction. We are backed by General Catalyst, Khosla Ventures, and Greylock Partners, with a founding team from Stanford, BrainGate, Oculus, and Tesla. While we can’t reveal too much just yet, our team is tackling cutting-edge engineering challenges to bring revolutionary products to life.

ABOUT THE ROLE

We are looking for a full-stack software engineer to turn whiteboard ideas into magical, user-facing product experiences! You’ll own features end-to-end: from idea → prototype → user feedback → iteration → deployment, and work across our software stack.

WHAT YOU'LL DO

• Develop the internal product stack that powers our workflows and prototype experiences across devices and companion clients.
• Build and expand our internal application for demos and data collection — the platform we’ll use to test ideas, validate UX, and refine product direction.
• Prototype new features for novel HCI, iterate with in-house test users and external participants, and polish until it feels like magic.
• Design and run product experiments (A/B tests, instrumentation, qualitative feedback loops) to learn quickly and make confident product decisions.
• Streamline data collection pipelines and participant experiences (setup flows, session reliability, metadata capture, monitoring, labeling hooks).
• Build demo features that showcase real-time sensing and inference in compelling, reliable ways.
• Identify high-leverage integrations into existing workflows (how we use the system day-to-day; internal tools that make the team faster).
• Create and extend automated testing + release infrastructure (CI/CD, smoke tests, regression checks) to support frequent iterations.
• Collaborate daily with ML, hardware, and industrial design; own requirements and deliver high-quality results; debug, optimize performance, and ensure reliability.

REQUIREMENTS

• Strong proficiency in Python (FastAPI, Pydantic; comfort with pandas/numpy) and modern TypeScript/React.
• Experience building production backends (APIs, data models, reliability/observability) and shipping user-facing features.
• Have shipped multiple 0→1 products or ambitious side projects that real people use. Bonus points if involving real-time data, experiments, or analytics.
• Independent work ethic, flexibility, and resourcefulness.
• Effective communication and collaboration skills.
• Comfortable in a fast-moving startup environment; excited to build independently and iterate rapidly.

STRONG CANDIDATES MAY HAVE

• Experience designing experiments / instrumentation (events, funnels, metrics, dashboards) and using results to drive product iteration.
• Familiarity with CI/CD and automated testing practices for fast iteration cycles.
• Experience with performance optimization and systems thinking (bonus: C/C++ for targeted native improvements, data encoding/transfer, drivers).
• A strong product/design mindset and user-centered thinking.
• 2+ years of experience in a Software Engineering role and a Bachelor’s degree or higher in a relevant field.

COMPENSATION RANGE

$120,000 - $180,000/year

BENEFITS

• Competitive equity package
• Comprehensive medical, dental, and vision insurance
• Company size: 20-30 people
• Unlimited PTO
• Visa sponsorship
• 4% 401k matching