Senior Gameplay Systems Engineer (Contract) – ECS / StateTree / Unreal Engine

Mob Entertainment is a startup multimedia studio that is best known for our hit indie horror game "Poppy Playtime". This franchise is one of the hottest new properties in gaming, and our team is naturally expanding as our ambition expands. To give a taste of our brand's popularity, more than 100 billion YouTube views of Poppy Playtime related content have occured since the game's launch 4 years ago.

Mob Entertainment is seeking a Senior Gameplay Systems Engineer to join the team on a contract basis through October 15th, supporting the development of one of our upcoming Unreal Engine projects. This role is designed to expand engineering bandwidth, reduce pressure on existing senior staff, and bring core gameplay systems from MVP to production-ready quality.

You’ll be responsible for building, refining, and stabilizing gameplay systems built using a data-driven ECS architecture (Flecs + StateTree). This is a high-trust, high-autonomy role—ideal for an experienced engineer who can independently own complex systems, solve problems without heavy oversight, and work seamlessly with designers and technical collaborators.

Responsibilities:

• Design, implement, and maintain gameplay systems using Flecs ECS and StateTree in Unreal Engine 5.
• Author and manage ECS components, systems, and queries for scalable, data-driven gameplay features.
• Refactor and stabilize existing MVP systems, resolving crashes, edge cases, and performance issues.
• Collaborate with design and technical design teams to ensure systems are usable, extensible, and intuitive.
• Build debug tools, diagnostic hooks, and testable runtime logic to improve cross-discipline workflows.
• Take ownership of assigned systems from spec to final polish—without needing constant direction or support.
• Provide light engineering support for areas such as QA tooling, telemetry, or porting, where applicable.

Requirements:

• 5+ years experience in gameplay or systems engineering roles on Unreal projects.
• Deep familiarity with Flecs ECS or equivalent data-oriented frameworks.
• Strong working knowledge of StateTree, blackboard logic, and gameplay state machines.
• Proficiency in C++, especially within Unreal Engine’s gameplay architecture.
• Ability to work independently and contribute meaningfully in a small, fast-moving team.
• Strong problem-solving skills and experience improving system stability and clarity.

Pluses:

• Experience developing QA tools, cheats, or test harnesses in Unreal.
• Familiarity with crash reporting, telemetry, and analytics SDKs.
• Exposure to porting workflows and platform-specific requirements.
• Experience working on projects where systems needed to scale or evolve beyond MVP.

Performance Expectations:

• Deliver stable, scalable systems that are easy for others to use and extend.
• Reduce senior team support burden by working with minimal supervision.
• Improve engineering throughput by owning technical implementation end-to-end.
• Contribute to the overall efficiency, maintainability, and velocity of the project.

Role Details:

Position Type: Contract

Contract Duration: Now through October 15th, 2025

Reports to: Lead Engineer / Director of Technology

Works with: Gameplay Designers, Technical Designers, QA, Production

Primary Tech: Unreal Engine 5, Flecs, StateTree, C++, Perforce

If you're a senior-level engineer who’s ready to take ownership of meaningful gameplay systems and help a small team move faster and smarter—we’d love to hear from you.

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Mob Entertainment is an equal opportunity employer. We do not discriminate on the basis of race, color, religion or religious creed, sexual orientation, gender, gender identity, marital status, family or parental status, disability, military or veteran status, or any other basis protected by law. All employment decisions are based on a person’s merit, business needs, and role requirements. If you require further accommodations or have questions regarding accessibility of our roles, please reach out to info@mobentertainment.com