Staff Mojo Compiler Engineer

Location: United States / Canada, United Kingdom

Department: Mojo

Location Type: REMOTE

Employment Type: FULL_TIME

About the role:

What you will do:

• Own the technical strategy and architecture for the Mojo compiler backend: IR lowering, optimization passes, and code generation targeting heterogeneous hardware. In Mojo, this spawns from MLIR all the way to LLVM backend or custom compilers.
• Act as tech lead for a team of backend compiler engineers, breaking down ambiguous problems, driving design reviews, setting technical standards, and multiplying the team's output.
• Drive performance: use and extend profiling tools to find optimization opportunities, then design the compiler passes that capture them.
• Lead the team's developer-tooling effort, debuggers (LLDB and the GDB family), profilers, debug-info generation, and data introspection / visualizers — and bring other engineers up to speed as contributors and owners in that space.
• Steer the editor and language-tooling experience in partnership with the rest of the compiler team, where the boundary between the language server (LSP) and the IDE extension is deliberately blurry.
• Partner across the Mojo language, MAX, kernel, and hardware-enablement teams, and engage Modular's open-source community.
• Mentor engineers, raise the technical bar, and influence direction beyond your immediate team.

What you bring to the table:

• Deep, hands-on compiler experience;IR design, optimization passes, and code generation in a production toolchain.
• Strong experience with both LLVM and MLIR — comfortable across dialects, lowering pipelines, and codegen.
• A track record of technical leadership without formal management: leading projects, setting architecture, and growing other engineers.
• Strong C++ and Python.
• Hands-on experience with debuggers in the LLDB and GDB family; not just using them, but ideally extending or building debugger support for a language or runtime.
• Familiarity with editor/IDE tooling, language servers (LSP), VS Code extensions, or comparable developer-experience surfaces.
• Working knowledge of CPU and/or GPU/accelerator architecture and the perf-analysis mindset that goes with it.
• Excellent collaboration and communication across distributed, cross-functional teams.

Helpful, but not required:

• Experience working in open source projects, user-facing SDK or community driven projects, actively involved in user interactions and requirement capture
• Solid command of profilers and performance analysis (e.g. Linux perf, LLVM XRay, or comparable sampling/instrumentation tooling).
• Accelerator backend code generation — experience targeting GPUs or custom AI accelerators at the codegen level.
• Graph compiler experience — building or optimizing graph-level compilation (e.g. XLA, TVM, or comparable ML compiler stacks).
• GPU debugging — hands-on with cuda-gdb and/or ROCgdb, readable symbol mangling and backtraces, and visualizing GPU data types (distinct from GPU codegen).
• Contributions to upstream LLVM/MLIR or other open-source compiler communities.

What Modular brings to the table:

• Amazing Team. We are a progressive and agile team with some of the industry’s best engineering and product leaders.
• World-class Benefits. In order to attract the best, we need to offer the best. Your benefits package may include comprehensive healthcare coverage, retirement and savings programs, employee stock purchase opportunities, paid time off, wellbeing resources, family support programs, and learning and development opportunities. Please note that specific benefit packages may vary based on your location, you can read more about benefits offered by Qualcomm here.
• Competitive Compensation. We offer very strong compensation packages, including RSU grants. We want people to be focused on their best work and believe in tailoring compensation plans to meet the needs of our workforce. 
• Team Building Events. We organize regular team onsites and local meetups in Los Altos, CA as well as different cities. Traveling 2-4 times a year is expected for all roles.