Principle Software Development Engineer in Test (SDET)

What We're Looking For We're seeking a skilled Software Development Engineer in Test to own and evolvethe quality engineering practice across our platform. This role spans the fulltesting spectrum, from end-to-end UI automation and API testing to CI/CDpipeline integration and performance validation. You'll work across both ourlegacy v1 application and our modern v2 microapplication architecture, building onexisting foundations to establish a robust, scalable test infrastructure that theentire engineering team can rely on. This isn't a siloed QA role. You'll be embedded directly with our developmentteam, shaping how we think about quality from design through deployment. You'llhave significant autonomy to assess what exists, define what's needed, and buildit. The ideal candidate will work closely with the VP of Engineering and ourdevelopment team to establish testing standards, expand automation coverage,and integrate quality gates throughout the development lifecycle. Key Responsibilities Test Strategy and Architecture Own and evolve test automation strategy across both the legacyv1 platform and the modern v2 microapplication architecture Assess the current state of test coverage and infrastructure, then define andexecute a roadmap for comprehensive quality engineering Design test frameworks and patterns that scale across multiple applicationsand deployment environments Establish testing standards, conventions, and best practices that the broaderengineering team adopts Make informed decisions about tooling, frameworks, and approaches that fit technology stack and team workflows End-to-End and UI Testing Build and maintain end-to-end test suites covering critical user flows acrossthe platform Develop UI automation for both the legacy Angular/React v1 application andmodern React/Mantine v2 microapps Create reliable, maintainable page object models and test utilities that reduceflakiness and improve developer confidence Validate responsive design, accessibility, and cross-browser compatibility aspart of the automation suite API and Backend Testing Develop comprehensive API test coverage for backend services andintegrations Validate data integrity, error handling, and edge cases across serviceboundaries Build contract tests and integration tests that catch breaking changes early Test database operations, migrations, and data pipeline reliability CI/CD and Test Infrastructure Integrate automated test suites into CI/CD pipelines to enforce quality gates onevery deployment Optimize test execution for speed and reliability across preview deploymentsand production releases Build reporting and visibility into test results so the team can act on failuresquickly Maintain test environments, fixtures, and seed data that support consistent,reproducible test runs Performance and Load Testing Design and execute performance tests to identify bottlenecks and validateplatform scalability Establish performance baselines and monitor for regressions across releases Collaborate with engineers to diagnose and resolve performance issuessurfaced through testing Simulate realistic load scenarios relevant to campaign delivery and platformusage patterns Collaboration and Quality Culture Work alongside developers during feature development to define test plansand acceptance criteria Participate in code reviews with a focus on testability, edge cases, and qualityconsiderations Champion a quality-first mindset across the engineering team — makingtesting a natural part of the development workflow, not an afterthought Contribute to sprint planning by providing effort estimates for test coverageand automation work Share knowledge on testing best practices and help developers write bettertests for their own code Growth and Career Development Opportunities This role offers significant opportunities for professional growth: Practice Ownership: Build and shape the quality engineering discipline from the ground up Technical Depth: Develop expertise across modern test tooling, cloudinfrastructure, and full-stack testing strategies Architectural Influence: Contribute to platform design decisions with a qualityand testability lens Cross-Functional Impact: Work across product, engineering, and customersuccess to understand how quality translates to customer satisfaction Tooling Innovation: Explore and introduce modern approaches to testautomation, observability, and continuous quality Mentorship: Help the development team level up their own testing skills andpractices As you grow in this role, you'll have opportunities to deepen your specialization inquality engineering and expand your influence on the platform's technicaldirection. Qualifications Who You Are You have atleast 9+ years of solid experience in software test engineering with a track record of building test automation from limited foundations into reliable, comprehensivesuites You think in systems, you understand how changes in one area can rippleacross an application and you design tests accordingly You're opinionated about quality but pragmatic about priorities, you knowwhere to invest deeply and where good-enough coverage is the right call You're comfortable owning a domain independently while staying tightlyembedded with a development team You're a clear communicator who can articulate testing strategy and tradeoffsto both engineers and non-technical stakeholders You're proactive about identifying gaps and proposing solutions rather thanwaiting for direction You're detail-oriented and take pride in building infrastructure that othersdepend on You have a growth mindset and stay current with evolving test tooling andpractices Technical Skills Strong experience with modern test automation frameworks (Cypress,Playwright, or similar) Proficiency in JavaScript/TypeScript for writing tests and test utilities Experience testing both frontend applications (React, Angular) and backendAPIs Working knowledge of CI/CD systems and integrating automated tests intodeployment pipelines Familiarity with performance and load testing tools (k6, Artillery, JMeter, orsimilar) Understanding of SQL and the ability to validate data at the database level Experience with version control systems (Git) and collaborative developmentworkflows Knowledge of test design patterns (page object model, data-driven testing,contract testing) Familiarity with cloud platforms (AWS preferred) and testing in cloud-hostedenvironments Understanding of web security testing fundamentals is a plus Experience with accessibility testing tools and standards is a plus Familiarity with audio technologies or ad tech platforms is a plus but notrequired This role offers a unique opportunity to own the quality engineering practice at acompany building innovative technology in the audio advertising space, whileworking closely with a collaborative engineering team that values craftsmanshipand continuous improvement.