Developer Infrastructure Engineer (Silicon)

What MatX is Building

MatX's mission is to make the world’s best AI models run as efficiently as allowed by physics, bringing the world years ahead in AI quality and availability.

What You'll Do Here:

The role covers three areas of equal weight:

• Branch and release methodology. Which branches exist, what each one is for, how a change reaches each one, and how that is verified.

• CI performance and debugging. Keeping a large, EDA-heavy test suite fast, affordable, and reliable, and finding the cause when it is not.

• Measurement and diagnostics. Instrumenting the above so that the state of the system is visible without anyone having to ask.

We expect every engineer to handle everyday collaboration: open a clean PR, review one, take feedback, and decline a change that is wrong. Where that is weak, we teach it. The specialized work is different: release branch structure, freeze enforcement, version pinning, merge-queue and runner behavior. That work is centralized because it requires specific expertise and consistency, not because other engineers are unable to do it. You would own the specialized work and improve the tooling and documentation that everyone else relies on. Success means people need your direct help less over time, not more.

Some common problems include:

• Operating the long-lived branches. Protected release branches run alongside the main branch, each with its own rulesets, presubmit checks, and notifications. Each has its own failure modes; for example, a push-triggered workflow runs the copy of itself that exists on the pushed branch. You would own the branch structure and make "did this change land where it was supposed to?" answerable from a report rather than by inspection.

• Making "what is the current version of X" mechanical. Several views of the same deliverable have to agree: a build from source, an archived release artifact, and whatever a downstream consumer is actually running. Drift detection should run continuously and its results should be visible without anyone asking.

• Keeping CI fast and reliable as it grows. EDA-heavy test suites are slow and expensive by nature, which makes gradual degradation easy to miss. The work includes critical-path analysis, remote-execution behavior under real resource limits, runner-pool sizing and cost, and flake triage that ends in a fix rather than a re-run.

How we'd work together:

This section describes how the role operates day to day. It suits some people well and others poorly, so it is worth reading closely.

• Ownership and completion. You would receive objectives rather than instructions. In return, a task is complete only when the change is pushed, CI is green, and the resulting state has been checked. Handing back work with the final verification still pending is the main thing that causes friction.

• Verification. You will be asked how you know something, and the question is not a criticism. Asserting something unchecked, such as that a resource does not exist, a pool is too small, or a limit cannot be avoided, is what draws pushback. The expected answer to "how do you know?" is the command you ran and its output. "I have not verified that yet" is always an acceptable answer.

• Durable fixes. The best outcome from a request is usually that the request does not need to be made again. Updating the runbook or adding the check that would have caught the problem is part of the work, not extra scope.

Who You Are:

Deep experience in one of the three areas plus working knowledge of the other two is preferable to moderate experience in all three. Tell us which area is your strongest.

• Version control internals. You can explain what a rebase does to commit identity, recover a branch that was deleted, verify by content that a cherry-pick landed, and describe what a squash merge queue does to history. You have built tooling on top of Git rather than only used it.

• CI systems experience. Merge queues, required checks, event-trigger semantics, app-based authentication, concurrency controls, and self-hosted runners. Given a slow or flaky pipeline, you can identify the cause and quantify it. This includes reading a Bazel query and a build profile, and working in Python and shell against REST and GraphQL APIs.

• Judgment under a schedule. You would be telling leadership what is and is not in a milestone. That requires saying "not yet" when it is true, and preferring a change that can be reverted to a migration that cannot.

Bonus Points If You Have:

• Developer-infrastructure work under hard deadlines in another industry (silicon, aerospace, games)

• Experience with repository structure at scale, whether monorepo or polyrepo

• Familiarity with EDA flows.

This is not the SRE role for the compute fleet, and it is not a process role that hands the tooling to someone else.

Compensation

The US base salary for this full-time position is determined based on a variety of factors including role, experience, location, job-related skills, and relevant education and training. Career length is only a guideline for compensation.

• Early Career - $160,000 - $275,000 + equity

• Mid Career - $175,000 - $400,000 + equity

• Senior Career - $250,000 - $600,000 + equity

What We Offer

• Time off: 4 weeks PTO (accrued) + 12 company Holidays + up to 3 weeks remote work

• Health: Company-subsidized Medical (Kaiser or Anthem) for employees & dependents, Guardian Dental and Vision insurances for employee & dependents, and life insurance (employee only), plus HSA and FSA offerings via Lively.

• Financial Wellbeing: Choose from Roth IRA or 401K (or both) retirement plans with up to 5% company contribution to 401K (even if you don't contribute). Also, 100% company-paid life insurance (up to $300K) and long-term disability insurances.

• Professional Development: $1500 Professional Development Budget (per year)

• Team Meals: MatX provides onsite team lunch & dinner Monday - Friday, with your choice of ordering via WeBox, Specialty’s or via our reimbursement system

• Commute on Us: Commute on our company Uber account, or reimburse your train rides. Either way, we pay 100% for your daily commute.

• MatX E[x]tras: $50/mo to use on the perk you value most

• Cell & Internet Reimbursement: $35/mo for cellular and $40/mo for wifi

• Mental Wellbeing: 100% paid mental health benefit via SpringHealth and Guardian EAP.

• Support to Parents: Up to 12 weeks paid parental leave regardless of path to parenthood, 10 weeks pregnancy disability leave, flexible return-to-work hours, and Benepass reproductive health & parental benefit.

• AI Resources: Up to $20K/month plus a dedicated internal AI Tooling Team to support your productivity

As part of our dedication to the diversity of our team and our focus on creating an inviting and inclusive work experience, MatX is committed to a policy of Equal Employment Opportunity and will not discriminate against an applicant or employee on the basis of race, color, religion, creed, national origin or ancestry, sex, gender, gender identity, gender expression, sexual orientation, age, physical or mental disability, medical condition, marital/domestic partner status, military and veteran status, genetic information or any other legally recognized protected basis under federal, state or local laws, regulations or ordinances. ---------

This position requires access to information that is subject to U.S. export controls. This offer of employment is contingent upon the applicant's capacity to perform job functions in compliance with U.S. export control laws without obtaining a license from U.S. export control authorities. --------

MatX does not accept unsolicited resumes from individual recruiters or third-party recruiting agencies in response to job postings. No fee will be paid to third parties who submit unsolicited candidates directly to our hiring managers or People team and any resumes submitted are deemed to be the property of MatX.