Harmonic Security

Systems SDET

Harmonic Security

full-time

Posted on:

Location Type: Hybrid

Location: London • United Kingdom

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Tech Stack

AWSGrafanaJavaJestLinuxMacOSRustSeleniumTypeScript

About the role

  • 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

Requirements

  • 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
  • Proficiency with standard tooling - Git, code review, and CI/CD systems
  • **Desirable:**
  • Experience with Jira, Notion, GitLab, OpenSearch, Swagger, Grafana, AWS, Figma, or Sentry (or similar tools)
  • Comfortable using AI tools to speed up workflows and boost productivity
Benefits
  • Competitive pay and meaningful equity with a direct stake in Harmonic’s success
  • Comprehensive benefits, pension plan, generous PTO, and flexible hybrid work
  • A small, passionate team that values transparency, creativity, and learning
  • Thoughtful leadership that cares deeply about growth, impact, and people
  • Annual global offsites (past trips include Lisbon and Nashville)
  • The chance to directly shape both our product and our culture as we build a category-defining company

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard skills
automated test infrastructureTypeScriptJavaRustJestPlaywrightBun testVitestJUnit5Selenium
Soft skills
debugginginvestigating bugscollaborationproblem-solvingcommunication