Staff Unity Engineer

Senior Unity Engineer

Locations: Tokyo

About us:

Deep expertise. Personal and Industry evolution. Impeccable craft. These are Limit Break’s founding principles.

Limit Break is founded by global industry leaders in mobile gaming. We are unlocking its potential beyond games to transform digital markets into real-world economies and digital worlds into vibrant communities who will take gaming economies for both players and traders to new limits. We combine the power of technology, and creative vision to create experiences that connect people from all corners of the globe.

Limit Break is backed by leading investors that include Buckley Ventures & Paradigm Ventures. The adoption rate and a number of public and private partnerships is proving it to be the next wave of technology of the future and Gaming is leading the way.

About the Role:

Unleash your potential at Limit Break as we seek an exceptional Unity Engineer to spearhead an exciting new venture! We are embarking on a groundbreaking journey to develop a cutting-edge, mid-core, 3D mobile game from concept to reality.

At the outset, you'll collaborate closely with a small yet dynamic team to craft and refine the game's prototype, ensuring alignment with executive stakeholders. As the project gains momentum, you'll take charge of scaling the team from pre-production to full production, collaborating with leads and directors across various disciplines.

This role offers an inquisitive and driven individual a rare chance to shape the workflow and assemble a top-notch team for an ambitious gaming project. Join a passionate and experienced organization where bright minds thrive, and your dedication to gaming excellence will be celebrated.

You will have the opportunity to play an active role as a core member from the beginning of the team. Leave your mark on the gaming world and be part of an engaging, forward-looking team!

Responsibilities: What you’ll do

• Design, implement, and maintain robust Unity / C# gameplay, UI, and client systems for a live mobile game.
• Build modular, data-driven features that respond safely to live configuration, remote content, and backend-driven state.
• Own features from design through implementation, polish, release, telemetry, debugging, and post-launch iteration.
• Collaborate closely with design, art, backend, QA, and production to turn ambiguous feature goals into reliable player-facing experiences.
• Partner with backend engineers on API contracts, client-server flows, error handling, version compatibility, and production diagnostics.
• Improve client architecture, performance, tooling, and engineering quality through thoughtful code reviews and maintainable system design.
• Diagnose and fix production issues across devices, builds, content, networking, and unity lifecycle edge cases.

Qualifications: Who you are and what you’ve done

• 8+ years professional game development experience, including 5+ years with Unity and C#.
• Shipped multiple games, including at least one Unity title.
• Deep understanding of Unity lifecycle, MonoBehaviours, ScriptableObjects, Prefabs, Addressables, serialization, and asset/content loading.
• Strong C# engineering fundamentals, including async programming, cancellation/cleanup patterns, memory/performance awareness, and maintainable architecture.
• Experience building data-driven or live-service systems that support remote config, content updates, events, or backend-driven behavior.
• Comfortable owning complex features end to end, from ambiguous requirements to polished production behavior.
• Strong debugging instincts for mobile client issues, including logs, crashes, performance, networking, and device-specific behavior.
• Able to work autonomously while communicating clearly with engineers, designers, artists, QA, and production.
• Has built or shipped at least one game in a small-team environment, taking ownership across multiple major facets of development.
• Proficiency in English.

Nice to have. What an ideal candidate looks like

• Bilingual preferred in English and Japanese.
• Experience with Free-to-play titles.
• Familiarity with CI/CD pipelines.