Multiplayer Systems Engineer – Studio Sirens

About Studio Sirens  Founded in 2024 under Snail Games, Studio Sirens is a development team focused on prototyping innovative gameplay systems, crafting bold new IP, and co-development projects. Blending technical precision with narrative ambition, the studio brings immersive worlds to life through a gameplay-first approach, supporting major releases while forging its own creative path within the Snail Games portfolio.

About the Role  We are seeking an engineer who builds the online systems that enable multiplayer games. You will work across C++ and Blueprints in Unreal Engine, and C# for backend services, to implement features such as matchmaking, session flows, player data, and the logic that drives dynamic dedicated server instances.

This role centers on building the online systems that power multiplayer gameplay and integrating those systems into Unreal Engine. You will design and implement multiplayer features, connect them to backend services, and ensure smooth, reliable communication between clients, servers, and the services that support gameplay.

Job Type: Full-Time 

Location: Hybrid in Loveland, Colorado (preferred 4 days/week onsite). 

Responsibilities

• Implement multiplayer features and client-server logic in C++ and Blueprints within Unreal Engine.

• Build backend services in C# to support matchmaking, sessions, authentication, and player data.

• Develop REST endpoints for communication between services and clients.

• Implement logic for dynamic dedicated server instancing, including session allocation and region selection. 

• Integrate backend features into Unreal Engine gameplay systems.

• Store and retrieve player data using NoSQL databases such as MongoDB or Redis.

• Ensure data integrity, efficient access patterns, and secure handling of user data.

• Debug, profile, and resolve complex gameplay and performance issues across the full multiplayer path between client, server, backend, and data stores to ensure shipping-readiness

• Collaborate with design, engineering, QA, and other disciplines to maintain smooth online feature integration.

• Proactively identify opportunities to improve stability, resilience, and overall online player experience.

Minimum Requirements

• Bachelor’s degree in Computer Science or a related field.

• Strong CS fundamentals: data structures, algorithms, concurrency, memory management.

• 4+ years of experience building multiplayer games or connected online systems.

• Strong proficiency in C++, Blueprints, and C#.

• Hands‑on experience with Unreal Engine 4 or 5, including client–server communication.

• Solid understanding of multiplayer networking fundamentals (client‑server models, replication, matchmaking, latency mitigation).

• Experience integrating backend services with game clients and dedicated servers.

• Familiarity with REST APIs.

• Experience with NoSQL databases such as MongoDB or Redis.

• Ability to debug issues across distributed systems and network boundaries.

• Comfortable collaborating with distributed teams and communicating clearly across disciplines.

Nice to Have

• Experience shipping games built with Unreal Engine.

• Experience working on games‑as‑a‑service and live operations.

• Experience managing dynamically spawned Unreal Engine dedicated server instances.

• Familiarity with matchmaking algorithms or session‑based multiplayer games.

• Exposure to cloud‑hosted game server fleets.

• Experience with multiplayer load testing or traffic simulation.

• Knowledge of authentication systems.

• Familiarity with telemetry, analytics, and observability for online systems    

Salary Range: $125,000 – $155,000 Annually

 Why Join the Studio Sirens Team?

• True focus on work/life balance

• Paid company holidays, vacation, and separate sick leave

• Medical, dental, vision, and Life/LTD

• 401k with company match

Work Authorization

Applicants must be legally authorized to work in the United States at the time of application. This position does not offer visa sponsorship now or in the future (including H-1B).

Additional Information

As part of the Company’s activities in video game development, publishing, and short-form video content creation, certain projects, discussions, or creative materials may include themes, visuals, language, or subject matter that some individuals could find mature, violent, sexual, graphic, or otherwise sensitive in nature (collectively referred to as “Mature Content”). Examples may include, but are not limited to, depictions or descriptions of combat, violence, adult themes or relationships, suggestive or satirical humor, or strong language. Employees are expected to engage with such material in a professional and creative context as part of their job duties.