Simulation Engineer

Please note that this is a hybrid position with a mixture of in-office (required) and home-based working (optional).

While we welcome all applications, this role does not offer relocation assistance. We encourage applications from candidates who are local to New York State or are able to relocate independently.

Part of the Rocket Science Group, Atomic Theory is a multinational team of seasoned AAA veterans with roots extending from Blizzard, PUBG, Epic, and Unity. We have a track record of delivering player‑centric, AAA-quality experiences, and we're unwavering in our commitment to performance, accessibility, and the engineering frameworks that underpin exceptional gameplay.

Atomic Theory is more than just a studio — it's a collaborative space where diverse experiences intersect to solve the toughest challenges in modern game development. With offices in Albany NY, Cardiff UK, and Brighton UK, we thrive at the opportunity to Get Sh!t Done on a global scale.

We are seeking a C++ / Simulation Engineer to drive the performance, architecture, and migration efforts of our simulation projects. In this role, you will migrate existing systems to C++, implement Flecs ECS patterns, and optimise simulation performance to support large‑scale, multi‑server environments. You will be responsible for the core simulation logic that powers our partners’ interactive experiences.

An ideal candidate is passionate about games, enjoys tackling a wide range of technical challenges, and has a track record of delivering great player and customer experiences across different areas of game development.

• C++ Migration: Identify and migrate under‑performing GDScript systems to C++ for improved performance and maintainability.
• ECS Implementation: Design and implement simulation logic using the Flecs ECS framework, ensuring efficient data locality and scalability.
• Performance Optimization: Profile simulation workloads, identify bottlenecks, and apply multithreading techniques to optimise frame time.
• Serialization & State: Develop robust serialization and state replication systems for distributed simulation support.
• Technical Design: Collaborate with the team to break down complex simulation requirements and deliver practical, high‑performance solutions.

• Strong C++ Skills
  :
  Professional experience with modern C++ (C++17/20), with a focus on performance and memory management.
• ECS Experience
  :
  Proficiency with Entity Component System architectures, preferably with Flecs.
• Mathematical Fundamentals
  :
  Solid understanding of linear algebra, physics, and simulation mathematics.
• Engineering Excellence
  : A commitment to writing clean, testable, and efficient code.
• Problem Solving
  :
  Ability to debug complex state issues and optimise performance‑critical code paths.

• Breadth of
  
  Experience:
  
  Comfort working across different systems and disciplines within game development, with a generalist mindset.
• Team
  
  Collaboration:
  
  Strong communication skills and the ability to work collaboratively with engineers, designers, producers, and project leads.
• Problem Solving: A proactive and thoughtful approach to identifying, diagnosing, and resolving technical challenges.
• Passion for Gaming: A genuine enthusiasm for games and a desire to help create engaging, high‑quality experiences for players.
• Interest in Learning: Curiosity and eagerness to learn new technologies, engines, and practices to remain adaptable and effective.

• GDScript Experience
  :
  Familiarity with Godot/GDScript to assist in migration efforts.
• Distributed Simulation
  :
  Experience with networking, state synchronization, or multi‑server architectures.
• Multithreading
  :
  Advanced knowledge of concurrency, lock‑free data structures, and parallel processing.
• Mentorship Skills
  :
  Experience supporting or mentoring less experienced developers as they build new skills.
• Stakeholder Communication
  :
  Experience working with internal or external partners to gather feedback, provide technical input, and solve problems collaboratively.

• Hybrid Working Arrangement: As a member of our team, you’ll have the flexibility to work at home and collaborate with your fellow…