Software Development Engineer in Test (SDET)
Quilt • Redwood City, California, United States
Role & seniority: SDET (Software Development Engineer in Test) — individual contributor, focused on test infrastructure and automation.
Stack/tools: Embedded systems, cloud services, mobile; hardware-in-the-loop (HIL) test rigs; device simulators/mocks; CI/CD (GitHub Actions, Bazel); regression suites; OTA, telemetry validation; languages likely include C/C++, Python scripting.
Top 3 responsibilities
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Build and maintain test infrastructure and automation for embedded, cloud, and mobile testing (CI/CD, flaky-test debugging, reliability & speed).
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Extend HIL test infrastructure for device commissioning, OTA updates, and telemetry validation; develop device simulators and mocks to reduce hardware dependencies.
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Create reusable test fixtures/libraries; automate repetitive manual test scenarios; improve testability and provide engineering support to enable easier testing by embedded teams.
Must-have skills
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Experience as an SDET or test automation engineer in embedded/cloud/mobile contexts.
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Strong background in CI/CD, test automation, and building test infrastructure.
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Familiarity with hardware-in-the-loop, device simulators, and creating mock/fake interfaces.
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Proficiency with C/C++ and scripting (e.g., Python); ability to design testable interfaces and reduce flaky tests.
Nice-to-haves
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Experience with OTA workflows, telemetry validation, and hardware test rigs.
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Prior work improving testability in embedded systems; knowledge of Bazel
Full Description
Location: Redwood City, CA
Our mission is to move humanity off of fossil fuel heating. 20% of US global warming emissions come from homes (that's more than cars!). The largest driver of home emissions is burning fossil fuels for heat. To stop climate change, over 80M US homes need to transition from combustion to efficient, electric heat pumps over the coming decades.
We believe for this to happen the world needs fantastic products that are easy to purchase. Today's heat pumps lack great design, make limited use of software, and are difficult and stressful to adopt. We are building a next generation, beautifully designed, AI optimized home heating and cooling system that is 10x better than what is on the market today.
Role
Quilt is hiring an SDET to build and scale test infrastructure for our heat pump products across embedded systems, cloud services, and mobile platforms. We're looking for someone who sees manual testing as a problem to automate, not a job to do. You'll work alongside a talented embedded and cloud engineering team, building the frameworks, simulators, and CI/CD pipelines that enable fast, confident releases. This is an infrastructure-building role with high leverage—your work will multiply the productivity of the entire engineering team.
We have hardware-in-the-loop test rigs and device simulators already in place. Your job is to expand them, make them easier to use, and drive adoption across the team. You'll also partner closely with embedded engineers to improve code testability—making it very easy for them to write unit and integration tests.
Responsibilities
Test Infrastructure & Automation (60%)
Build and maintain CI/CD pipelines for embedded, cloud, and mobile testing (GitHub Actions, Bazel) Extend hardware-in-the-loop (HIL) test infrastructure for device commissioning, OTA updates, and telemetry validation Develop device simulators and mocks to reduce hardware dependencies in testing Automate repetitive manual test scenarios into regression suites (e.g., pairing flows, firmware upgrades, cloud integration) Create reusable test fixtures and libraries that make it easy for engineers to write tests Debug and eliminate flaky tests; improve CI reliability and speed
Test Infrastructure & Engineering Support (30%)
Build test fixtures, utilities, and templates that make it easy for embedded engineers to write tests Design testable interfaces and mock layers for device features Provide C
