Senior Software Engineer, Cobalt

About the Role:

We are hiring a Senior Software Engineer to build Tubis native app runtime for connected TVs on Cobalt the lightweight open-source browser engine behind YouTube on living room devices. You will own the layer between Tubis React app and the device: the Cobalt engine its Starboard porting layer and new native components we write in C and Rust.

The goal is a Tubi app that launches faster uses less memory and behaves the same on every device starting with Fire TV and expanding to other CTV platforms. This is a hands-on high-ownership role on a small team working closely with our web engineers QA and device partners.

This is a hybrid role which is two days in the SF office.

What Youll Do:

• Build integrate and ship Cobalt as the runtime for Tubis CTV apps packaged as a native library inside our Android (Fire TV) app and later on other platforms
• Implement and maintain Starboard platform integrations: graphics input audio/video playback DRM and system services
• Write new native modules in modern C and Rust including safe FFI boundaries between the two
• Drive startup and memory performance on low-end memory-constrained devices (1 GB RAM class): profile measure and fix
• Keep us current with upstream Cobalt releases track and contribute fixes upstream and manage security patches for the engine we ship
• Work with media and playback teams on video pipeline needs such as demuxing adaptive streaming and ad playback
• Build tooling that runs the Tubi app on Cobalt on developer machines and in CI so we can test UI and automation without a device farm
• Work directly with device partners engineering teams on platform issues
• Mentor engineers and raise the teams native and systems engineering bar

Your Background:

• 6 years of professional software engineering most of it in systems or native code
• Expert-level modern C (C17/20): memory management concurrency templates and debugging large codebases
• Strong production experience in Rust: ownership and lifetimes async unsafe code and C/C interop (FFI bindgen/cxx)
• Experience with large C build systems (GN/Ninja CMake or Bazel) and cross-compiling for ARM and embedded Linux or Android targets
• Hands-on performance work: profiling CPU memory and startup time with tools like perf Perfetto or heaptrack and turning findings into measurable wins
• Comfort debugging on real hardware: Android NDK adb native crash analysis and symbolication
• Clear written communication and a track record of leading technical initiatives across teams

Nice to Have

• Experience with Cobalt Starboard Chromium or another browser engine (Blink WebKit Servo)
• JavaScript engine internals especially V8: code caching snapshots or GC tuning
• Graphics on embedded devices: OpenGL ES Skia or WebGPU
• Media pipelines: MSE/EME ExoPlayer or native players demuxers Widevine or PlayReady DRM
• Shipping on TV platforms such as Fire TV Android TV Samsung Tizen LG webOS or Roku
• Open-source contributions to C or Rust projects
• Enough React and TypeScript to work with the web app running on top of the engine

#LI-CL1

#LI-Hybrid

Tubi is a division of Fox Corporation and the FOX Employee Benefits summarizedherecovers the majority of all US employee following distinctions below outline the differences between the Tubi and FOXbenefits:

• For US-based non-exempt Tubi employees the FOX Employee Benefits summary accurately captures the Vacation and Sick Time.
• For all salaried/exempt employees in lieu of the FOX Vacation policy Tubi offers a Flexible Time off Policy to manage all personal matters.
• For all full-time regular employees in lieu of FOX Paid Parental Leave Tubi offers a generous Parental Leave Program which allows parents twelve (12) weeks of paid bonding leave within the first year of birth adoption surrogacy or foster placement of a child in addition to applicable government leave program(s) and FOXs short-term disability policy. This time is 100% paid through a combination of any applicable state city and federal leaves and wage-replacement programs in addition to contributions made by Tubi.
• For all full-time regular employees Tubi offers a monthly wellness reimbursement.

Boldly built for every fandom Tubi is a free streaming service that entertains over 100 million monthly active users. Tubi offers the worlds largest collection of Hollywood movies and TV shows thousands of creator-led stories and hundreds of Tubi Originals made for the most passionate fans. Headquartered in San Francisco and founded in 2014 Tubi is part of Tubi Media Group a division of Fox Corporation.

We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race color religion sex national origin gender identity disability protected veteran status or any other characteristic protected by law. We will consider for employment qualified applicants with criminal histories consistent with applicable law.