Senior Software Engineer, C++ UI Roku, Inc.

Coding Black Females Ltd; Manchester; Hybrid; GBP 90,000 - 120,000; Full time

Job summary

Roku is seeking a Senior Software Engineer to architect core UI systems, optimize graphics primitives, memory usage, and hardware acceleration across embedded platforms.

You will mentor engineers, tackle low-level challenges, and collaborate with firmware and driver teams to push performance to the microsecond and deliver a fast, consistent TV experience.

Qualifications

• 5+ years of software engineering experience with C++14/17/20.
• Strong systems programming, memory management and multithreading.
• Experience with graphics APIs and rendering pipelines.

Responsibilities

• Architect and optimize core C++ UI frameworks and rendering engines.
• Lead investigations into bottlenecks, memory leaks, and GPU/CPU synchronization issues.
• Develop and maintain low-level graphics APIs and layout systems.
• Collaborate with firmware and driver teams for hardware-specific optimizations.
• Mentor junior developers through code reviews and design sessions.
• Implement debugging tools and automated performance tests.

Skills

C++

Systems programming

Graphics APIs

Python tooling

Generative AI tools

Tools

GDB

Valgrind

Job description

About the team

At Roku, the UI Systems team builds the high-performance engines and core graphics infrastructure that power millions of devices. We own the low-level C++ frameworks, rendering pipelines, and system architectures that enable smooth navigation and rich animations. Our work sits at the intersection of hardware and software, where we optimize graphics rendering, memory management, and layout engines to ensure a consistent, lightning-fast experience across our entire device portfolio. We operate in a collaborative, high-trust environment, partnering closely with firmware and silicon teams to push the boundaries of what’s possible on embedded hardware.

About the role

As a Senior Software Engineer , you will be a key architect of the core systems that underpin Roku’s user experience. You will design and implement performance-critical code within our UI engine, focusing on graphics primitives, memory efficiency, and hardware acceleration. You’ll tackle complex systems-level challenges—such as optimizing frame rates on resource-constrained hardware and building robust APIs for higher-level frameworks. This role is ideal for engineers who thrive on low-level systems programming, care about performance down to the microsecond, and want to build the high-performance foundations that power the future of television.

What you’ll be doing

• Architect and optimize core C++ UI frameworks and rendering engines to ensure buttery-smooth performance across a diverse range of hardware profiles.
• Lead technical investigations into system-level bottlenecks, memory leaks, and GPU/CPU synchronization issues.
• Develop and maintain low-level graphics APIs and layout systems that serve as the backbone for Roku’s application ecosystem.
• Integrate AI/ML capabilities at the systems level, leveraging generative AI tools to optimize code generation and automate performance profiling.
• Collaborate with firmware and driver teams to leverage hardware-specific optimizations and ensure seamless integration with the underlying OS.
• Mentor junior developers through deep-dive code reviews, architectural design sessions, and technical documentation of core systems.
• Drive engineering excellence by implementing advanced debugging tools, automated performance regression suites, and modern C++ best practices.

We’re excited if you have

• Minimum of 5+ years of software engineering experience with a heavy focus on C++ (C++14/17/20).
• Deep understanding of systems programming, including memory management, multi-threading, and hardware-software abstraction layers.
• Experience with graphics APIs (e.g., OpenGL, Vulkan, or proprietary embedded graphics stacks) and rendering pipelines.
• Proficiency in Python for tooling and automation, with a working knowledge of BrightScript or JavaScript being a significant plus.
• Strong root cause analysis skills, specifically using tools like GDB, Valgrind, or platform-specific profilers.
• Knowledge of AI applications and hands-on experience using generative AI tools to accelerate systems-level development.
• A proactive mindset with a passion for squeezing every drop of performance out of embedded systems and a commitment to data-driven optimization.