Top Tech Jobs & Startup Jobs in London

Leads and develops a Western Europe Client Partner team supporting strategic advertising and mobile gaming clients. Oversees account strategy, revenue growth, retention, expansion, forecasting, pipeline reviews, and business planning. Coaches team members, resolves escalations, improves client engagement, and identifies upsell and cross-sell opportunities across Unity solutions. Partners with leadership and cross-functional stakeholders to strengthen commercial impact, operating processes, and long-term client relationships.

Design and implement unified, cross-platform APIs for Unity, contribute implementations and unit tests to the codebase, refactor and maintain high-quality C# and C++ code, collaborate across teams, and drive stable, testable platform abstractions.

Design, implement, and maintain a high-performance cross-platform shader management system. Improve performance, stability, and testability of existing systems, collaborate with cross-functional graphics teams to deliver engine features across platforms, and build automated tests for features and fixes to enable shaders across render pipelines and device performance levels.

Own a named portfolio of UK agency and brand accounts, carry quota, run full sales cycle for programmatic and managed service deals, build agency relationships, respond to RFPs, pitch Unity ad solutions, and collaborate with internal teams to grow revenue and presence in-market.

Leads the Android platform software engineering team supporting Unity across mobile and laptop devices. Owns technical strategy and execution, drives runtime performance optimization and benchmarking, collaborates with Unity and platform stakeholders, and develops a high-performing engineering organization through hiring, mentoring, coaching, and career development. The role also involves Android native development, graphics APIs, real-time 3D technologies, and selective use of AI workflows.

Own and develop Unity’s Web runtime, optimizing build size, download, startup, and loading performance. Design and implement low-level improvements across C++, C#, JavaScript, WebAssembly, Emscripten, and LLVM, including multi-threading and progressive asset loading. Collaborate with platform teams, profile and debug across native and browser boundaries, mentor engineers, and establish code quality standards.

Develop and maintain Unity’s Web runtime, adding features, fixing issues, and optimizing download size, load time, startup performance, and native code. Work across C++, C#, and JavaScript while profiling and debugging browser-based runtime behavior. Collaborate with distributed teams, investigate developer-reported issues, and track evolving browser capabilities. The role may also involve WebAssembly, Emscripten, LLVM, WebGL, real-time 3D, and compression techniques.

Lead end-to-end design and implementation of Diagnostics backend: high-throughput Go services, ingestion and OpenTelemetry pipelines, ClickHouse-based storage and queries, and dashboard surfaces. Collaborate cross-team, mentor engineers, raise code-review and AI-agent workflow standards, and ensure reliability, performance, and secure data handling.

Lead technical onboarding and solution design for strategic enterprise customers, owning end-to-end VPC deployments, connectivity design, security hardening, and testing. Act as primary technical contact, run discovery/whiteboard sessions, manage multiple onboardings, optimize customer environments, and advocate product enhancements based on deployment feedback.

Work as an embedded QA engineer for Unity Studio performing manual and exploratory testing, owning QA processes from requirements to sign-off, writing and maintaining test cases, managing defect lifecycles, collaborating with engineers/product managers, participating in agile ceremonies, and contributing to quality process improvements.