Software Development Engineer in Test

About the role

Harmonic Security is seeking an SDET to build and maintain automated testing infrastructure for their AI governance and control platform. You will design test frameworks, manage cross-platform test environments, and integrate testing into CI/CD pipelines to ensure high-quality security solutions. This role requires a hands-on approach to testing across UI, browser extensions, endpoint agents, and backend services.

Responsibilities

• Design, implement, and maintain test frameworks for UI, browser extensions, endpoint agents, and backend services
• Build and run cross-platform tests on Windows, macOS, and Linux to validate system stability
• Expand and investigate load tests to validate system behaviour at scale
• Investigate bugs, write failing tests, and partner with engineers to verify fixes
• Integrate tests into GitLab CI pipelines, set up quality gates, and generate test reports
• Monitor, triage, and improve test coverage while shaping the QA roadmap

Required skills

• Automated testing
• TypeScript
• Java
• Rust
• Test frameworks
• Cross-platform testing
• CI/CD
• GitLab CI
• Debugging
• Git

Nice to have

• Jest
• Playwright
• Bun test
• Vitest
• JUnit5
• Selenium

Benefits

• Pension plan
• Flexible hybrid work
• Annual global off-sites

About the Company

Harmonic Security governs AI usage by understanding user and agent intent in real time. Named to the Rising in Cyber 2026 list, the company operates at the intersection of AI and cybersecurity, backed by investors including N47, Ten Eleven Ventures, and In-Q-Tel.