Senior Software Development Engineer in Test; SDET Remote; U.S

Senior Software Development Engineer in Test (SDET)

Remote (U.S.)

Flex is a growth-stage, NYC‑headquartered Fin Tech company that is creating the best rent payment experience. We empower renters with flexible, affordable rent payment options. After building an enthusiastic user base and securing investor support, we are looking for motivated individuals to help us grow our mission.

As a Senior SDET at Flex, you will own test automation and quality efforts for major product areas or features. You will architect and optimize automation frameworks, lead test strategy for complex systems, and collaborate across teams to deliver reliable, high‑quality releases. This role offers the opportunity to mentor others, drive cross‑functional quality improvements, and shape the future of our engineering excellence.

• 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

• Bachelor’s degree in Computer Science or related field, or equivalent experience
• 4+ 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 (Playwright, Cypress, Selenium, Rest Assured)
• 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 (Data Dog, New Relic)
• Excellent cross‑functional communication and mentorship skills
• Strong written and verbal communication skills; able to collaborate across functions

The compensation range for this role will be commensurate with the candidate’s experience and Flex’s internal leveling guidelines and benchmarks.

• For NY/NJ/CA locations, the base salary pay range will be $158,000‑$172,000
• For all other U.S. locations, the base salary pay range will be $142,000‑$155,000

• Competitive medical, dental, and vision available from Day 1
• Company equity
• 401(k) plan with company match (match kicks off at the beginning of 2026)
• Unlimited paid time off + 13 company paid holidays
• Parental leave
• Flex Cares Program
• Free Flex subscription

Flex is an equal opportunity employer. We do not discriminate on the basis of protected group status under any applicable law.