← All roles

Software Development Engineer in Test (SDET)

Zefr· Technology
Apply on company site
Hybrid (Marina del Rey, CA)$90k - $120kFull-timePosted 1w ago

About the role

SDET role focused on owning quality across APIs, web apps, data pipelines and AI-powered services by building automated tests, monitoring production, and ensuring releases gate quality.

Responsibilities

  • Plan testing for each feature. Join grooming, ask clarifying questions, and write test plans that cover happy paths, edge cases and negative cases.
  • Build and maintain test automation for REST and GraphQL APIs, backend services, web UIs and third-party partner APIs, in a shared code-based framework. Review teammates' test code.
  • Validate data pipelines and data quality. Write checks on pipeline outputs (schemas, row counts, freshness, business rules) and help define data SLAs.
  • Test AI and ML features. Compare model or prompt versions on fixed datasets, validate shadow deployments before rollout, and test AI agents and their tools (such as MCP servers) for correct behavior, input validation and error handling.
  • Keep tests running in CI/CD. Wire suites into pipelines so they gate merges and deploys. Keep them fast and reliable by triaging failures, fixing flaky tests and cutting run time.
  • Validate releases in preview, staging and production: prepare test data, run regression, sign off, and verify after deploy.
  • Monitor production quality. Build synthetic checks, dashboards and alerts that catch regressions and bad data before customers do.
  • Investigate issues and incidents. Reproduce problems, find root causes, write clear bug reports and verify fixes. Help out during high-severity incidents.
  • Work across roles with engineers, product managers, data scientists and customer-facing teams. Turn findings into well-scoped tickets and share quality status openly.

Qualifications

  • 1–3 years of experience, ideally as a QA engineer or SDET, with hands-on test automation.
  • Solid coding skills in at least one language used for test automation. Python is preferred; Java, TypeScript or Go also work.
  • Experience automating API tests: request and response validation, schema checks and negative cases.
  • Experience with a modern UI end-to-end framework such as Playwright, Cypress or Selenium.
  • Working SQL. You can query across tables to confirm data is complete and correct.
  • Good test design instincts: edge cases, boundary values, negative cases and the test pyramid.
  • Comfort with Git, pull requests, code review and running tests in CI/CD pipelines.
  • Persistence when debugging: reading logs, inspecting network calls and querying databases.
  • Clear written communication: bug reports, test plans and short async status updates.

Skills

Required:Test automationPythonAPI testingUI end-to-end testing frameworkSQLCI/CDBug reporting and documentation

Benefits

  • Flexible PTO
  • Medical, dental, and vision insurance with FSA options
  • Company-paid life insurance
  • Paid parental leave
  • 401(k) with company match
  • Professional development opportunities
  • 13 paid holidays off
  • Summer Fridays (we leave early)
  • In-office, hybrid, and fully-remote work options available
  • In-office lunches and lots of free food
  • Optional in-person and virtual events (we like to celebrate!)
Last updated Oct 15, 2026. Interested? Apply on the company site.
Zefr logo

About Zefr

Total Walled Garden Transparency

Zefr is the leader in AI-powered content classifications for brands and advertisers.

AI technologyContent classificationBrand safetySocial platformsBrand suitabilityContent transparency
Company profileWebsite

More open roles at Zefr