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Handshake is a career platform powering 25 million job seekers, 1 million+ employers, and 1,600 educational institutions. In 2025, the company launched Handshake AI, a rapidly growing AI data business that has scaled from $0 to ~$1B run rate, paying ~$60M monthly to over 30K individuals. The company partners with frontier AI labs, Fortune 500 companies, and top educational institutions.
You will join the Build Review & Test team as a Software Engineer responsible for making development faster, more reliable, and easier to understand. Your focus will be on building and improving tools that run builds and tests, review code changes, and explain failures—tools used by both human engineers and coding agents.
Key responsibilities include:
- Build and maintain tools for builds, tests, code review, and merging changes that work well for both engineers and AI coding agents
- Identify and fix slow builds, unreliable tests, and confusing error messages by addressing root causes
- Optimize test speed and reliability through parallelization, result reuse, and test isolation
- Improve failure visibility and guidance so users understand what went wrong and next steps
- Enhance tools, instructions, and environments that coding agents use to write, test, and debug code
- Develop automated code reviews and checks to reduce repetitive work while maintaining quality standards
- Use developer feedback and system data to identify and validate improvements
- Share knowledge through documentation, code reviews, and collaboration with teammates
You care as much about how tools feel to use as whether they work—speed, clarity, and helpful error messages matter. You'll use developer surveys, direct conversations, and system metrics to guide your work.
REQUIREMENTS:
- 3–5 years of professional software engineering experience or equivalent hands-on experience
- Strong JavaScript or TypeScript skills with production ecosystem experience (Node.js, Bun, or browser-based)
- Hands-on experience with JavaScript unit testing and end-to-end testing (Jest, Vitest, Playwright)
- Proven track record shipping and maintaining production software with automated tests
- Careful debugging approach; you test assumptions and follow evidence to root causes
- Curiosity about unfamiliar code and patience to learn complex systems
- High bar for user experience; you notice friction points and care about usability details
- Ability to complete clearly defined projects independently while knowing when to collaborate
- Clear communication, willingness to give and receive feedback, and knowledge-sharing mindset
EXTRA CREDIT (not required):
- Build systems or CI experience (Buildkite, GitHub Actions, Docker, Kubernetes)
- Experience building or extending test frameworks and shared libraries
- Track record making tests faster or fixing flaky tests
- Hands-on use of coding agents with ability to write effective instructions
- Automated code review or testing experience
- Experience improving build and release reliability and security
- Proficiency with logs, metrics, or traces for investigation
