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 enginee r 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 3% 401k matching