Back End Developer

Lead Backend Engineer Remote (US) - hubs in SF and Boston - hybrid encouraged. Up to $230,000 Base + Equity I'm working with a well-funded engineering company building software that helps deploy complex algorithms across heterogeneous compute environments for defence, aerospace, semiconductors, and edge computing. This role sits within the Modelling & Simulation team, building backend systems that represent complex real-world entities, operational workflows, and decision logic for mission-critical software. This is not a full-stack role. It's not an AI tooling position. It's a backend engineering role for someone who enjoys building robust Python systems that model complex domains and operate reliably in production. You'll work on problems such as: • Designing backend systems for modelling and simulation platforms • Building Python services, APIs, and distributed backend systems • Defining domain models, data contracts, and service boundaries • Debugging complex production systems across services, databases, and infrastructure We're looking for engineers who have: • Strong production Python backend engineering experience • Experience building modelling, simulation, defence, geospatial, gaming, logistics, planning, or other operationally complex systems • Owned backend services, APIs, data models, and distributed systems from design through production • Experience leading technical direction while remaining hands-on • Strong software engineering fundamentals and a track record of shipping reliable production systems Nice to have: • Defence, government, or security-cleared experience • Experience supporting mission-critical or regulated software • Experience leading small engineering teams • Exposure to heterogeneous compute or embedded systems If you're a backend engineer who enjoys solving complex modelling problems and building production systems with real-world impact, I'd love to chat.