Senior Core Engineer (C++/C#)

Location: San Francisco, CA, USA

Base salary: $135,800–$203,600, $153,400–$230,200, or $172,400–$258,600 USD gross annually, depending on the primary work location zone.

Company

A leading game engine and real-time 3D platform used for games, XR, web experiences, and 3D applications in automotive, manufacturing, and healthcare.

What you will do

• Own and evolve critical engine subsystems across low-level C++, high-level C# APIs, editor, build, and runtime code.
• Design high-performance APIs for embedded, cross-process, and networked configurations.
• Develop low-overhead systems for execution timing and resource contention across processes and networks.
• Orchestrate component and asset loading, change tracking, serialization, and synchronization in bandwidth- and latency-constrained environments.
• Build infrastructure that enables the engine to run as a guest within other processes, engines, and distributed systems.

Requirements

• Experience building or fundamentally extending game engine cores, middleware, or foundational systems such as serialization, build pipelines, or memory subsystems.
• Ability to design modular, testable systems and implement and debug them end to end.
• Strong C++ and C# skills with practical knowledge of CPU caches, branch behavior, memory layout, and profiling.
• Hands-on experience across multiple engine domains, such as physics, animation, input, and assets.
• Professional English proficiency is required for frequent written and verbal communication.
• Work visa and immigration sponsorship are not available.

Nice to have

• Experience with compression, streaming, replication, authority models, RPCs, state diffing, delta encoding, or real-time network protocols.
• Knowledge of determinism, replay systems, and simulation consistency.
• Deep knowledge of multithreading, job systems, lock-free techniques, or hirify.global DOTS.
• Experience with MCP-style tool interfaces, training data generation, machine learning, or agentic workflows.

Culture & Benefits

• Health, life, and disability insurance, with coverage depending on country and employment status.
• Employee stock ownership and retirement or pension plans.
• Vacation, personal days, parental leave, and family-care programs.
• Mental health support, employee resource groups, and a global employee assistance program.
• Training and development programs, volunteering support, office snacks, and commute subsidies.