Sr. Software Engineer, Frontend

Senior Product Engineer – Fullstack and Frontend - San Francisco, CA (Onsite)We are looking for a Senior Product Engineer who thrives in a fast-paced, in-person environment and takes pride in owning features end to end. This role is for engineers who combine strong technical fundamentals with a passion for building products that scale, perform, and make a meaningful impact.Location: San Francisco, California What you will doArchitect, build, and ship features across the stack, from backend systems to polished user interfaces, with iteration cycles measured in hours.Partner directly with founders to design systems where AI must make real-time decisions balancing precision, speed, and user trust.Scale the product into new industries and workflows through rapid pilots, live demos, and customer-facing iterations. Contribute to the core platform fundamentals engineered to support billions of users. Operate with urgency and ownership, ensuring every project reflects high standards of craft and accountability.Technical environmentFrontend: React, Next.js, TypeScript Backend: MySQL, ClickHouse, Python AI/ML: Large Language Models integrated into real-time decision systems Preferred exposure: Event sourcing, stream processing, Elixir, Rust, ScalaWhat we are looking forDeep technical expertise with React, Next.js, TypeScript, MySQL, and ideally ClickHouse.Proven ability to deliver complex, high-impact products beyond internal tools or simple dashboards. Startup experience or strong signals such as top-tier schools, open-source contributions, or tenure at leading technology companies. Strong fundamentals in system design, scalability, and code quality, with clear opinions about your craft.Bonus points for experience in event-driven architectures, distributed systems, or advanced programming languages such as Elixir, Rust, or Scala.What is not a fitFrequent job changes or unexplained employment gaps. Consulting-heavy backgrounds without product ownership. Long-time managers or CTOs seeking to return to individual contributor roles.Primarily infrastructure or DevOps-focused experience without product engineering depth.CultureOwnership and urgency: a team that values accountability and speed. Craft and debate: spirited discussions, bold ideas, and building products we are proud of. In-person collaboration: close, hands-on work in San Francisco for faster iteration and deeper alignment.Compensation and benefitsSalary range: 130,000 to 210,000 depending on experience, interview performance, and location.Relocation assistance: available.