Senior Software Engineer, Physical AI

Investment Profile Seed-stage infrastructure company in New York building core developer tooling for the next generation of physical AI systems. The company is developing an AI-native platform that enables engineering teams to model, validate, and iterate on complex real-world systems entirely in software before deployment. Their customers solve difficult engineering problems where correctness, fidelity, and iteration speed directly impact real-world outcomes. The founding team has deep experience building AI, autonomy, and large-scale software systems and is assembling an exceptionally technical, in-person engineering team in NYC. Summary This isn't a traditional simulation engineering role. The company is looking for engineers who enjoy taking messy, incomplete real-world systems and turning them into software that people can trust. You'll work across systems engineering, software infrastructure, sensing, calibration, developer tooling, performance, and customer problems. Some weeks you'll be building core platform capabilities. Others you'll be working directly with customers to understand why reality doesn't quite match the model and building the tooling needed to close that gap. If you enjoy difficult technical problems, high ownership, and building foundational technology from scratch, this is one of the more interesting opportunities we've seen in physical AI. What You'll Own Designing and building high-fidelity software models of complex physical systems Developing platform capabilities for modeling, calibration, validation, and testing Translating noisy real-world data into reliable software abstractions Improving system correctness, determinism, scalability, and performance Building engineering tooling that accelerates customer onboarding and deployment Working directly with customers to solve difficult technical problems Helping shape the technical direction of an early platform company You'll work closely with the founders and early engineering team across platform engineering, infrastructure, AI, and customer deployments. What We're Looking For You likely have experience with several of the following: Building simulation, robotics, perception, autonomy, computer vision, or other complex engineering systems Developing production software in Python (Rust or C++ is a plus) Working with physical systems, sensing technologies, calibration, system identification, or quantitative validation Building developer tooling, infrastructure, or platform software used by other engineers Shipping production-quality engineering systems rather than research prototypes Operating effectively in ambiguous, fast-moving startup environments Experience with modern robotics simulation platforms, digital twins, physics engines, or related technologies is highly relevant, but we're primarily looking for exceptional systems engineers who enjoy difficult technical problems and learning new domains. Prior startup experience is a strong plus. Our ideal candidate has high agency, cares deeply about engineering quality, and enjoys owning difficult technical problems from first principles through production. About Us Greylock is an early-stage investor in hundreds of remarkable companies including Airbnb, LinkedIn, Dropbox, Workday, Cloudera, Facebook, Instagram, Roblox, Coinbase, Palo Alto Networks, among others. Learn more at https://greylock.com/ How We Work We are full-time, salaried employees of Greylock and provide free candidate referrals and introductions to our active investments. This posting is for direct employment with one of our portfolio companies. We review every application and reach out directly when we believe there's a strong potential fit. Show more Show less