Senior Software Engineer
TestBox (Buffer2) · San Francisco, United States · On-site
Posted Aug 31, 2026
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About the role
We are hiring a Senior Software Engineer in San Francisco to own major features and services, raise the technical bar, and mentor engineers across the team.
What you will do
- Lead design reviews and set technical direction for your area
- Build and evolve services with reliability and performance in mind
- Mentor engineers through pairing and code review
- Drive improvements to developer experience and tooling
Must have
- 6+ years of software engineering experience
- Ownership of major features or services in production
- Depth in at least one modern backend or frontend stack
Nice to have
- Experience in high-growth B2B SaaS environments
Location: San Francisco, CA (hybrid). Apply through our career site with your resume.