Software Development Engineer In Test

October 4, 2026

Hybrid

Senior

London

Worth knowing

English is required

Description

Harmonic Security is hiring a Software Development Engineer in Test to build and maintain automated testing infrastructure across its AI Governance and Control platform. The role covers designing test frameworks, setting up cross-platform test environments, running load tests, and integrating tests into GitLab CI pipelines. The product spans customer portals, browser extensions, endpoint agents, and MCP gateways, so rigorous, scalable test coverage across this diverse stack is critical.

Responsibilities

Design, implement, and maintain test frameworks for UI, browser extensions, endpoint agent, or backend services
Build and run cross-platform tests on Windows, macOS, and Linux, setting up test environments for the endpoint agent
Expand, run, and investigate load tests to validate system behaviour at scale
Investigate bugs, write failing tests, file detailed tickets, and partner with engineers to verify fixes
Integrate tests into GitLab CI pipelines, set up quality gates and detailed test reports
Monitor, triage, and improve: file detailed bugs in Jira, escalate critical issues, 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 such as Jest, Playwright, Bun test, Vitest, JUnit5, Selenium and cargo test
Willingness to learn new test frameworks as the stack evolves
Cross-platform testing experience with VMs, real machines and debugging platform-specific issues
CI/CD pipeline knowledge including GitLab CI, quality gates and useful test reports
Demonstrable experience using AI tools to speed up workflows and boost productivity
Solid debugging skills and proficiency with Git, code review, and CI/CD systems
Genuine curiosity for AI and commitment to using it to work smarter and faster

Conditions

Competitive pay and meaningful equity in the company's success
Comprehensive benefits including a pension plan
Flexible hybrid work arrangement
Annual global off-sites, past trips include Lisbon and Nashville

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