Flex · 23 hours ago
Senior Software Development Engineer in Test (SDET)
United States
Full-time
Remote
Mid, Senior Level
$158K/yr - $172K/yr
4+ years expFlex is a growth-stage FinTech company headquartered in NYC, aiming to revolutionize the rent payment experience. As a Senior SDET, you will own test automation and quality efforts, architect automation frameworks, and lead test strategy for complex systems while collaborating across teams to ensure high-quality releases.
AppsBillingFinancial ServicesFinTechSoftware
Responsibilities
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
Proven ability to lead test strategy and risk analysis while making high-impact technical decisions amid ambiguity and prioritizing what matters most
Qualification
Required
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 (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
Benefits
Competitive medical, dental, and vision available from Day 1
Company equity
401(k) plan with company match (our company match kicks off at the beginning of 2026)
Unlimited paid time off + 13 company paid holidays
Parental leave
Flex Cares Program
Free Flex subscription
Competitive compensation + company equity
Unlimited PTO
Company
Flex
Flex enables people to pay rent bills on a schedule that fits their personal finances.
201-500 employees
H1B Sponsorship
Flex has a track record of offering H1B sponsorships. Please note that this does not
guarantee sponsorship for this specific role. Below presents additional info for your
reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (1)
2024 (1)
Funding
Current Stage
Growth StageTotal Funding
unknown2025-03-31Series A
2019-11-01Seed
2019-07-24Pre Seed
Leadership Team
Shragie Lichtenstein
Co-Founder & CEO
Michael Jannain
Staff Software Engineer
Recent News
Flexible Finance, Inc.
2025-10-14
Flexible Finance, Inc.
2025-10-09
2023-12-15
Company data provided by crunchbase