Senior Software Development Engineer in Test (SDET)

BILL is a fintech company that provides financial automation tools for businesses. The Senior Software Development Engineer in Test will champion software quality by designing automated tests, embedding testability into development, enabling CI/CD quality gates, and helping engineering teams release continuously with confidence.

Responsibilities:

• Spend ~80% of your time on automation and enabling the team to drive quality through strong testing practices, taking an automation-first, AI-assisted approach to test design and authoring
• Collaborate with Engineers, Product, and Design to solidify and validate feature requirements - clear acceptance criteria, specifications, and expected outcomes - early in the lifecycle
• Partner with Engineering to create and evangelize quality practices, coaching developers to own more of their own test authorship over time
• Write automated tests in TypeScript/Playwright across UI and API layers (functional, contract, and integration)
• Contribute to testing framework design and implementation, optimize the testing process, and enable quality gating within the CI/CD pipeline for the squad's deliverables
• Leverage AI tools (test generation, self-healing locators, coverage-gap analysis, failure triage) to increase coverage and reduce maintenance overhead
• Regularly write and complete manual and exploratory tests alongside automation to verify new features, cover edge cases, and catch regressions
• Investigate and root-cause automated test failures, distinguishing product defects from flaky tests and infrastructure issues
• Define and maintain release criteria, test plans, and coverage expectations across multiple squads

Requirements:

• Bachelors degree in Computer Science, Engineering, Mathematics, or equivalent work experience
• 5+ years of professional experience on a software development team (cross-functional environment preferred)
• Experience designing, implementing, and running automated tests with Playwright (or a similar modern browser automation framework, with a willingness to work primarily in Playwright)
• Proficiency in JavaScript/TypeScript preferred
• proficiency in any functional or general-purpose language considered
• Hands-on experience with AI-assisted testing – using AI tools to generate tests, triage failures, maintain self-healing locators, or analyze coverage gaps – and a mindset of folding these into everyday workflows
• API testing knowledge – REST/GraphQL, request/response validation, auth flows, and API-level automation
• An innate ability to pick up and ramp on new technologies and languages quickly
• Experience determining the cause of automated test failures
• Experience documenting and completing manual tests
• Experience writing release criteria and associated test plans
• Knowledge of CI/CD pipelines and quality gates
• Payments industry experience or exposure to card issuing (virtual/physical cards, payment rails, settlement, reconciliation, or related domains)
• Experience with contract testing (Pact or similar) and visual regression testing (Chromatic, Percy, or similar)
• Experience introducing coverage gating and enforcing quality thresholds in the delivery pipeline
• Familiarity with observability tooling (Datadog, Splunk) for test and production quality signals
• Experience building or maintaining shared test frameworks/libraries used by other engineers
• Exposure to evaluating non-deterministic / AI-powered features (eval frameworks, prompt/output validation)