Senior Software Development Engineer in Test, Harmonic Security

• 5+ years as an SDET building and maintaining automated test infrastructure
• Strong programming skills in at least one of TypeScript, Java, or Rust
• Experience with modern test frameworks and willingness to learn new ones - at Harmonic we use Jest, Playwright, Bun test, Vitest, JUnit5, Selenium, and Rust's native testing framework (cargo test)
• Cross-platform testing experience on Windows, macOS, and Linux - comfortable setting up test environments, debugging platform-specific issues, and working with VMs or real machines
• CI/CD pipeline knowledge - you know how to integrate tests into GitLab CI (or similar), set up quality gates, and make test reports useful
• Solid debugging skills - comfortable investigating bugs, reproducing issues, and working with engineers to get them fixed
• You don't need prior experience with every tool or framework listed - we value adaptability and the ability to learn quickly
• Have a proactive approach to work - you seek out problems before they reach production and value continuous improvement
• Are a thorough and creative thinker who understands how to build complex, often custom, automated tests
• Write test code with the same rigour, readability, and discipline as production code
• Think like both a developer and a tester: you care about behaviour, performance, edge cases, and long-term maintenance
• Are comfortable working across platforms - whether that means setting up VMs, debugging on unfamiliar operating systems, or figuring out how to test platform-specific behavior
• Collaborate well with engineers - you help troubleshoot test failures, partner on bug fixes, and make testing easier for the whole team
• Value observability and test reliability as much as test breadth - fast meaningful feedback is your gold standard
• Thrive in fast-paced startup environments where ambiguity is the norm
• See AI as a tool to help you build smarter, faster and better

Desirable

• We're looking for a Software Development Engineer in Test (SDET) to build and maintain automated testing infrastructure across our products
• You'll design test frameworks, set up cross-platform test environments, hunt down bugs, integrate tests into CI/CD pipelines, and work closely with engineers to keep our quality bar high
• This is a hands-on, adaptable role where you'll need to apply yourself wherever testing is needed most
• You'll design, implement, and maintain test frameworks for our UI, browser extensions, endpoint agent, or backend services - you'll need to apply yourself wherever QA is needed
• Build and run cross-platform tests on Windows, macOS, and Linux - set up test environments to validate our endpoint agent doesn't break user systems
• Expand, run, and investigate load tests to validate system behaviour at scale and ensure we can handle growth
• Investigate bugs, write failing tests, get them fixed - write tests that expose the issue, fix it yourself if you can, or partner with engineers to verify the fix
• Integrate tests into CI/CD - add tests to GitLab CI pipelines, set up quality gates and detailed test reports, keep tests fast and reliable
• Monitor, triage, and improve - file detailed bugs in Jira, escalate critical issues quickly, track test coverage, shape the QA roadmap
• What Success Looks Like:
• You've improved test infrastructure: You've enhanced and maintained test frameworks wherever needed - UI, browser extensions, endpoint agents, or backend services
• Cross-platform confidence: Our products ship to Windows, macOS, and Linux with confidence
• Load testing validates scale: The team knows the system can handle growth before deploying to more users
• Bugs get caught and fixed fast: Your failing tests expose issues quickly, and you work with engineers to get them resolved
• CI/CD is reliable: Tests are integrated smoothly, reports are clear, pipelines stay green, and engineers know why things break
• Coverage is tracked and improving: You monitor what's tested and what's not, continuously filling gaps