Principal Python Engineer (Modelling & Simulation)

About the role:We are hiring a hands-on Python engineer to build and operate production-grade modeling and simulation systems.You’ll take ownership across architecture, implementation, deployment, and ongoing operation—designing scalable software that performs reliably in complex, constrained environments. This is a backend and systems-focused role for an engineer who enjoys solving ambiguous problems, defining clean system boundaries, and shipping maintainable software.What you’ll do:Design, build, deploy, and operate Python systems for modeling and simulation.Develop robust APIs, data models, distributed workflows, queues, and state machines.Make thoughtful architectural decisions around performance, reliability, data structures, and system boundaries.Build resilient failure-handling, testing, observability, and CI practices.Debug complex production issues and improve system scale, performance, and reliability.Integrate Python services with C++ components and simulation platforms.At senior levels, mentor engineers and help shape foundational technical direction while remaining hands-on.What we’re looking for:Strong production Python backend engineering experience.Clear ownership of software from initial design through deployment and operation.Experience building APIs, distributed systems, workflow engines, queues, or stateful services.Strong software design, testing, CI, and production-debugging skills.Credible experience with C++.Exposure to AFSIM or comparable modeling and simulation platforms.Evidence of building scalable, reliable systems—not only scripts, notebooks, prototypes, or basic CRUD applications.The ability to explain technical trade-offs and your personal contribution to shipped systems.Experience in defense, autonomy, robotics, planning, logistics, geospatial systems, or similarly constrained technical domains is especially relevant.Location: Boston/HybridCompensation: Flexible for the right candidate, $200k+