Senior Software Engineer, Cobalt

About the Role:

We are hiring a Senior Software Engineer to build Tubi's 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 Tubi's 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 You'll Do:

• Build, integrate, and ship Cobalt as the runtime for Tubi's 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 team's 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++ (C++17/20): 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

Pursuant to state and local pay disclosure requirements, the pay range for this role, with final offer amount dependent on education, skills, experience, and location is listed annually below. This role is also eligible for an annual discretionary bonus, long-term incentive plan, and various benefits including medical/dental/vision, insurance, a 401(k) plan, paid time off and other benefits in accordance with applicable plan documents.

$186,400—$266,300 USD

• 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 FOX’s 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.