Senior UI Engineer — High-Performance Rendering & AI

Roku; Cambridge; Hybrid; GBP 90,000 - 130,000; Full time

Job summary

Roku is seeking a Senior Software Engineer for the UI team to design, implement, and optimize systems underpinning Roku's user experience and developer platform. You’ll work on performance-critical paths across graphics rendering, animation, and UI frameworks across devices.

You'll guide AI-assisted workflows, collaborate with hardware, firmware, and product teams, and shape core architecture for tens of millions of users.

Qualifications

• 6+ years of software engineering with a strong focus on UI frameworks, systems, or application development.
• Strong proficiency in C++ for performance-critical systems and rendering pipelines.
• Strong proficiency in TypeScript for building UI layers and developer-facing tooling.
• Experience with JavaScript/BrightScript or similar scripting languages.
• Proficiency in Python for tooling, automation, or AI workflows.
• Demonstrated fluency across the agentic engineering toolchain with projects delivering real work using these tools.

Responsibilities

• Build and scale UI frameworks and features optimized for millions of users.
• Design and implement performance-critical systems across rendering pipelines, layout engines, and animation frameworks using C++.
• Drive work through agentic coding tools — setting context, planning, and verifying agent-generated output across the full SDLC.
• Develop and maintain developer-facing tools and UI layers.
• Lead technical investigations and architect solutions across middleware and UI infrastructure.
• Integrate AI/ML and generative AI capabilities into developer workflows and platform features.
• Establish verification practices — testing, review, and quality gates for AI-assisted work.
• Collaborate with cross-functional teams to deliver platform features with measurable gains in performance, reliability, and scalability.
• Create tooling, frameworks, and automation to improve developer efficiency and code quality.
• Mentor junior engineers through design reviews and pair programming, including guiding AI agents.

Skills

C++

TypeScript

JavaScript

Python

Debugging

Technical communication

Tools

Claude Code

Cursor

MCP servers

agent frameworks

custom skills

Job description

Roku is seeking a Senior Software Engineer for the UI team to design, implement, and optimize systems underpinning Roku's user experience and developer platform. You’ll work on performance-critical paths across graphics rendering, animation, and UI frameworks across devices.

You'll guide AI-assisted workflows, collaborate with hardware, firmware, and product teams, and shape core architecture for tens of millions of users.