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Senior Software Development Engineer in Test (SDET)

Flex - Remote - Remote - posted 2026-10-14

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Salary: USD 115,600 - 170,000 / annual

Flex is a growth-stage fintech company headquartered in NYC that is transforming rent payments by enabling users to pay throughout the month on a flexible schedule that fits their finances. The company is now scaling and seeking a Senior SDET to own test automation and quality efforts for entire product areas and major features. In this role, you will architect and optimize automation frameworks, lead test strategy for complex systems, and collaborate across teams to deliver reliable, high-quality releases. You will mentor junior SDETs and QA team members, drive cross-functional quality improvements, and play a critical part in shaping engineering excellence. Key responsibilities include: - Architect, implement, and optimize automated test frameworks for complex product areas, ensuring high reliability and maintainability - Design, develop, and maintain robust automated test suites for API, UI, and integration testing - Lead test strategy development and perform risk analysis for major features and systems - Integrate automated testing into CI/CD pipelines, supporting continuous integration and delivery processes - Proactively identify systemic quality issues and drive cross-team process improvements to increase coverage and efficiency - Analyze test coverage, identify gaps, and implement solutions to improve product quality - Collaborate closely with engineering, product, and quality leaders on cross-functional quality initiatives and release planning - Provide technical guidance and mentorship to junior SDETs and QA team members, fostering skill development and best practices - Review code and test cases contributed by other engineers for quality and maintainability - Maintain accurate and actionable test documentation, reports, and quality metrics for assigned product areas - Investigate and resolve complex defects and production issues through advanced debugging and root cause analysis - Advocate for quality and champion adoption of best practices within and across engineering teams Flexis a distributed company with employees throughout the US, Australia, Canada, and South America. Roles posted in New York, San Francisco, and Salt Lake City are hybrid (2-3 days/week on-site); candidates outside these areas may be eligible for relocation assistance. REQUIREMENTS: - Bachelor's degree in Computer Science or related field, or equivalent experience - 5+ years of experience in software development and test automation - Advanced proficiency in multiple programming languages and test automation frameworks - Deep experience designing, building, and maintaining automation frameworks (e.g., Playwright, Cypress, Selenium, RestAssured) - Strong expertise in API, UI, and integration testing - Proficient in CI/CD pipeline integration and optimization - Skilled in test strategy development, risk analysis, and test architecture - Advanced debugging, troubleshooting, and root cause analysis - Solid understanding of database systems and advanced SQL - Experience with observability and monitoring tools (e.g., DataDog, NewRelic) - Excellent cross-functional communication and mentorship skills - Strong written and verbal communication skills; able to collaborate across functions

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