Senior Unity Mobile Game Engineer - AI-Driven & Live Ops

Lego; Greater London; Hybrid; GBP 65,000 - 90,000; Full time

Job summary

LEGO is seeking a Senior Client Developer with deep Unity expertise to join Offroad Games, the mobile studio within LEGO Digital Play. This role focuses on hands‑on development, extending an established Unity base and leveraging AI‑assisted tools as part of a fast‑paced workflow.

You'll work with engineering leadership to extend the Unity tech stack, and will ship features end‑to‑end on mobile while collaborating across disciplines.

Qualifications

• Substantial experience developing games in Unity with C#.
• Track record of shipping at least one mobile title.
• Experience with large, long‑lived codebases.
• Hands‑on use of AI‑powered coding assistants to speed up development, code review and testing.
• Strong knowledge of mobile device performance (CPU/GPU, memory, loading times, stability).
• Experience building systems/infrastructure that a game depends on.

Responsibilities

• Build game features end to end with designers from idea to players.
• Build, debug, ship and monitor features in the mobile client.
• Improve shared client code libraries with the wider client team.
• Create and maintain AI‑assisted automation for development workflows.
• Build supporting infrastructure including automated testing, live‑ops integration and performance metrics.
• Analyze and fix key areas of mobile client performance.
• Recommend improvements based on tooling metrics.
• Own the systems you build and maintain them over time.

Skills

Unity

C#

Mobile dev

AI tools

Performance

Tools

AI assisted coding tools

Job description

LEGO is seeking a Senior Client Developer with deep Unity expertise to join Offroad Games, the mobile studio within LEGO Digital Play. This role focuses on hands‑on development, extending an established Unity base and leveraging AI‑assisted tools as part of a fast‑paced workflow.

You'll work with engineering leadership to extend the Unity tech stack, and will ship features end‑to‑end on mobile while collaborating across disciplines.