YC Work at a Startup - United States, On-site work

Join Keystone as a Founding Engineer in San Francisco. Shape the future of autonomous software engineering using TypeScript, React, Python, and AWS. Own the core product and culture while receiving significant equity, full benefits, and a wellness-focused environment.

Join as a Founding Engineer to build autonomous AI agents for e-commerce support. You'll own full-stack features using Next.js, Python, and AWS, working in rapid build-measure loops. This New York-based role offers significant equity to a developer who ships quality code and leverages AI tools da...

Join Parametric in San Francisco as a Senior ML Infrastructure Engineer. Build the core systems powering our robotics autonomy stack from the ground up. You'll design production-grade infrastructure for the full ML lifecycle, enabling rapid iteration. This early-stage role requires expertise in c...

Join our team in San Francisco as a Software Engineer for the Data Engine. You will build robust systems and tools to collect, process, and manage large-scale robotic training datasets. This role requires expertise in Rust/C++ and involves hands-on work across hardware, software, and data pipelin...

Join Channel3 in NYC to build the database powering AI commerce. Develop backend systems using computer vision and multimodal models to understand billions of products. This role focuses on building reliable, cost-efficient search and deduplication at scale. Enjoy team dinners and a fully stocked...

Join Channel3 as a Fullstack Engineer in New York to build the definitive internet product database. You'll leverage Python, TypeScript, and React to shape merchant-facing tools and pioneer agentic commerce UX. This role offers ownership of frontend architecture in a fast-paced environment with t...

Join Hypercubic as a Founding Software Engineer in San Francisco. Shape AI systems that analyze and rearchitect critical legacy enterprise applications. You'll work directly with the CTO, owning architecture and product direction from prototype to production. This role demands strong fundamentals...

Join as a Founding GPU Kernel Engineer in San Francisco. Hand-tune and optimize low-level GPU kernels for ML workloads, pushing hardware limits. Deep expertise in CUDA/ROCm, profiling tools, and GPU assembly is essential. Receive equity, bonus, benefits, and relocation assistance in this pivotal ...

Join as a Founding Engineer to architect the Unity mobile app for Pax Historia from scratch. You will build the core gameplay loop, optimize for mobile performance, and integrate with backend services. This role requires 3+ years of experience shipping polished Unity apps to iOS/Android stores. B...

Join Truth Systems as a Founding Full-Stack Engineer in San Francisco. You'll build our core trust & safety platform from 0→1 using React, TypeScript, Next.js, and Python. We seek a product-focused, empathetic builder with strong full-stack skills. Receive meaningful equity (0.3-1%) and comprehen...

Join Verne as a founding Robotics Data Infrastructure Engineer in San Francisco. Architect and deploy critical AWS and edge data pipelines for real-world robots. You'll manage large-scale multimodal datasets and build MLOps tooling, directly impacting production systems. Requires strong Python, A...

Join Idler in San Francisco as a Software Engineer. Build agentic systems and tooling for cutting-edge AI coding environments used by leading labs. We seek passionate developers, including new grads (US only), to ship features fast. Enjoy full benefits, latest tech, PTO, and team events.