Mojo Back-End Compiler Engineer

AI in this role

Compiler engineer to design and implement multi-target compiler technology stacks and language features for AI hardware.

llvmmlircpython

compiler-designoptimizationgpucpu

About Modular

At Modular, a Qualcomm company, we’re on a mission to revolutionize AI infrastructure by systematically rebuilding the AI software stack from the ground up. Our team, made up of industry leaders and experts, is building cutting-edge, modular infrastructure that simplifies AI development and deployment. By rethinking the complexities of AI systems, we’re empowering everyone to unlock AI’s full potential and tackle some of the world’s most pressing challenges.
If you’re passionate about shaping the future of AI and creating tools that make a real difference in people’s lives, we want you on our team. You can read about our culture and careers to understand how we work and what we value.

About the role:

Mojo is our secret sauce, spell-book, and Mjolnir — a new programming language that blends the soul of Python with the raw, elemental power of C. It’s designed to unlock every ounce of performance from modern AI hardware, while still being human-friendly and beautifully expressive.
We are searching for a compiler engineer who can help make Mojo the best language for heterogenous programming for CPUs, GPUs and hardware accelerators.
You will be designing a multi-target compiler technology stack, based on MLIR and LLVM. You will be collaborating with kernel authors and hardware engineers to get best performance for each hardware target.
We are a small team with no internal boundaries. You will end up touching everything in the Mojo land, from language to IR to codegen to SDK and user experience.

LOCATION: LOCATION: Candidates based in the US, Canada, and UK are welcome to apply. You can work in our office in Los Altos, CA, or Edinburgh, or remotely from home. Onboarding for new hires is conducted in-person at the appropriate office.

What you will do:

Craft and implement new Mojo language features on top our MLIR-based compiler architecture.
Dream up and realize optimization passes that make GPUs, CPUs, and accelerators sing in harmony.
Shape the developer experience for Mojo — from syntax to performance semantics.
Collaborate with the Modular core teams, researchers, and an emerging open-source community.
Help define what "next-generation language design" means in the age of AI.

What you bring to the table:

5+ years working on compilers, runtimes, or language implementations.
Hands-on mastery of C++ (Python fluency a big plus).
Experience with MLIR and LLVM.
Experience optimizing code for CPUs, GPUs or AI accelerator hardware
Have contributed to a real-world compiler project

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.

Working at Modular will enable you to grow quickly as you work alongside incredibly motivated and talented people who have high standards, possess a growth mindset, and a purpose to truly change the world. The estimated base salary range for this role to be performed in the US, regardless of the state, is $180,000 - $270,000 USD.
The estimated base salary range for this role to be performed in Canada, regardless of the province, is $ 172,400 - $258,600 CAD.
The estimated base salary range for this role to be performed in Edinburgh is £99,600 –£150,000 GBR.
The salary for the successful applicant will depend on a variety of permissible, non-discriminatory job-related factors, which include but are not limited to education, training, work experience, business needs, or market demands. This range may be modified in the future. The total compensation for a candidate will also include annual target bonus, equity, and benefits, with equity making up a significant portion of your total compensation.For candidates who fall outside of the listed requirements, we nevertheless encourage you to apply as we may have upcoming openings that are lower/higher level than the ones advertised.

How we rate this

Mojo Back-End Compiler Engineer at Modular rates 90 out of 100 for how much of the daily work is AI. That makes it Builds AI (AI Level 4 of 4). The level is about AI in the job, not seniority.

Classification

Builds AI. The job is building AI systems.

●●●● Builds AI80 to 100
●●●○ Works on AI60 to 79
●●○○ Uses AI40 to 59
●○○○ Little AI0 to 39

Levels come from how often the tools, models and workflows of the role are named in the posting itself. Open the description and count.

Key facts

Mojo Back-End Compiler Engineer is an open job at Modular.
Level rates this role AI Level 4 of 4: Builds AI.
The listed salary is $180k-$270k a year.
The role is based in Remote and is marked remote.
The job was posted on October 1, 2026.
Seniority: senior.
Applications are handled by Modular. Apply on Modular

Prepare for this job

A free preview built only from this posting: what it asks for, what you could be asked in an interview, and how to adjust your resume.

Skills and AI tools this role asks for

Compiler DesignOptimizationGPUCpuLlvmMlirCPython

Questions you could be asked

Tell me about a project where compiler design was part of your work. What did you do?
Tell me about a project where optimization was part of your work. What did you do?
Tell me about a project where gpu was part of your work. What did you do?
Tell me about a project where cpu was part of your work. What did you do?
Walk me through how you've used Llvm in your day-to-day work.

Adapt your resume

List these exact terms on your resume: Compiler Design, Optimization, GPU, Cpu, and Llvm. An applicant tracking system matches the wording, not the idea.
Attach one line of real, concrete experience to at least one of them — a tool named with nothing behind it rarely survives a human read.
Lead with what you built, trained or shipped — this role is judged on the AI system itself, not the tools around it.

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