Senior Unity Game Developer

Location: REMOTE / Montreal, QuebecThis job allows you to work remotely.Our client is an AI-powered, mobile-first social sandbox where players don't just play stories, they build them. Think Minecraft meets The Sims meets Wattpad: a new genre of creative, social storytelling where AI helps players bring their imagination to life.With $6.5millions USD in Series Seed funding. Backed by top-tier investors who have invested in OpenAI, Unity, Supercell, and others, the client is building a platform that reimagines storytelling as play, combining intuitive creation tools, emotionally expressive characters, and collaborative world-building.This Role:We are looking for a Senior Unity Game Developer who excels at the intersection of client engineering and cloud-driven multiplayer systems.You’ll design and build features for the Unity front end that power the mobile experience, and stretch into the Go backend (following existing patterns) to own features end-to-end. From buttery-smooth rendering to cloud-native streamed gameplay, you’ll ensure players feel the magic—instantly and reliably.This is a senior individual contributor engineering role. You’ll lead through hands-on coding, collaborating closely with another senior Unity developer, backend, product, and design teams to deliver performant, testable, and maintainable features.The ideal candidate thinks like a full-stack engineer, loves high-quality codebases, and understands the nuances of a networked multiplayer game on mobile.What you will do:•Prototype and ship new gameplay features that showcase the AI-powered creation tools and social systems•Evolve the Unity client: design and implement new features, test and optimize performance, and integrate with mobile platforms (iOS & Android)•Integrate features with a websocket-based multiplayer layer, ensuring low-latency and state synchronization with the Go backend•Collaborate with backend engineers to design API contracts and occasionally contribute Go code using existing frameworks and patterns•Optimize rendering, memory, and bandwidth for cloud-streamed play and AI-driven features•Write testable, modular C# code and introduce/maintain automated tests (unit, integration, play-mode) in Unity•Mentor peers through thoughtful code reviews and technical guidance; champion engineering best practices•Monitor live metrics, debug production issues, and deliver rapid fixes without sacrificing code qualityMust Have Skills:•5+ years professional experience developing games in Unity/C#, including at least one shipped mobile or cross-platform live service game•AI-fluent or AI-literate: Excited to share how AI tools can accelerate your development workflows and learn to integrate gameplay with AI technology•Strong understanding of networked gameplay architectures (authoritative server, client prediction, reconciliation, websockets or similar)•Experience collaborating with backend teams and contributing full-stack. You can read and write basic server-side code using existing frameworks and patterns•Strong grasp of software architecture, design patterns, and automated testing strategies in Unity•Proven track record optimizing performance, memory, and build size for mobile devices and/or streamed game clients•Familiarity with CI/CD pipelines, and modern DevOps practices•Startup-ready: autonomous, adaptable, bias to action, and energized by rapid iteration•Prior startup experience or shipping a complete game on your ownNice to Have Skills:•Prior experience integrating ECS-style, data-oriented architectures in Unity•Experience with integrating LLMs or Diffusion models in production and/or assessing AI performance through evals•Experience with the Go programming language #J-18808-Ljbffr