Senior Software Engineer, Simulation Platform

Seattle · Costa Mesa, CA (OC-00) · USD 191,000-253,000 · 3+ years experience · Full-time · Posted Oct 14, 2026

At a glance

The Simulation Platform team owns the core architecture and infrastructure of Anduril's high-fidelity, multi-domain military mission simulator.
Mission Sim is a large, mature C++20 codebase with an Entity-Component-System architecture, a stable C ABI plugin system, embedded scripting, and a variety of physics-based models.

Model authoring tools - extend the Sim frontend with UI for authoring and tuning Mission Sim models
Negotiate extension APIs with the GUI team and build an ergonomic UI atop them, working alongside Simulation Modeling engineers
Develop custom Entity-Component-System architecture that underpins the entire simulator: entity lifecycle, component storage, and the update loop
Plugin and SDK development - maintaining a versioned C ABI, which enables external teams to extend the simulator
Performance and scale - keeping the simulation loop fast enough for real-time and faster-than-real-time execution with hundreds of concurrent entities
Reason about memory layout, cache behavior and contention, as entity counts grow
Integration architecture - gRPC services, DIS protocol interoperability, networking messaging, and file recording for analysis and playback
Support domain experts in integrating new and enhancing existing capability models

3 years of professional experience with C++20 and strong C++ skills
Experience designing internal APIs and frameworks that other engineers build on, with focus on backwards-compatibility and ergonomics
Solid understanding of systems programming fundamentals: memory management, shared libraries, ABI stability, linking, interfacing with the operating system
Comfort with linear algebra and applied math
Familiarity with Linux-based C++ development toolchains
Ability to reason about performance-sensitive code - cache behavior, memory layout, algorithmic complexity
Clear technical communication and ability to work in a large, shared codebase and negotiate architectural decisions that affect a growing team
Eligibility to obtain and maintain an active U.S. Government Secret security clearance

5+ years of professional experience with C++20
Experience leading or mentoring engineers on a project - setting technical direction and bringing others along
Comfort operating in ambiguity - scoping the problem, the approach, and the interfaces when none exist yet, and driving them to a decision
Experience with military simulation, defense modeling & simulation, or related domains
Experience with Entity-Component-System architectures or game engine design patterns
Experience in designing and implementing GUI-supported workflows
Familiarity with gRPC, DIS (IEEE 1278.1) distributed simulation standard
Experience with Python/C++ interop (pybind11, embedded interpreters)

Highly competitive equity grants
Top-tier benefits for full-time employees, including comprehensive, competitive benefits package available at little to no cost to employees