Senior Software Development Engineer in Test (SDET)

Job Description

• Work Policy: Remote; roles in New York, San Francisco, and Salt Lake City are hybrid with 2 to 3 on-site days per week
• Job Type: Full Time
• Salary Range: $115,600 – $170,000 USD depending on location tier
• Experience Level: Senior, 5+ years in software development and test automation
• Core Tech Stack: Playwright, Cypress, Selenium, RestAssured, SQL, DataDog, New Relic

About Flex

Flex is a growth-stage FinTech company headquartered in New York City. It builds a payment layer for household bills, letting people view, split, and pay bills in ways that fit their income and schedules. Flex gives more control over payment timing and methods, and on-time payments can help build credit history. The company describes its culture as collaborative and ownership-driven, focused on solving hard problems and having a real impact.

About the Role

The Senior SDET owns test automation and quality for entire product areas or major features. The role involves designing automation frameworks, leading test strategy for complex systems, and working across teams to ship reliable releases, along with mentoring others and driving quality and engineering improvements.

What You’ll Do

• Architect, build, and optimize automated test frameworks for complex product areas, with a focus on reliability and maintainability
• Design, develop, and maintain automated test suites for API, UI, and integration testing
• Lead test strategy and perform risk analysis for major features and systems
• Integrate automated testing into CI/CD pipelines to support continuous integration and delivery
• Identify systemic quality problems and drive cross-team process changes to improve coverage and efficiency
• Analyze test coverage, find gaps, and implement fixes to improve product quality
• Work with engineering, product, and quality leaders on cross-functional quality initiatives and release planning
• Mentor junior SDETs and QA team members on skills and best practices
• Review code and test cases written by other engineers for quality and maintainability
• Maintain accurate test documentation, reports, and quality metrics for assigned areas
• Investigate and resolve complex defects and production issues through advanced debugging and root cause analysis
• Champion quality and best practices within and across engineering teams
• Lead test strategy and make high-impact technical decisions in ambiguous situations, prioritizing what matters most

What You’ll Need

• Bachelor’s degree in Computer Science or a 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 such as Playwright, Cypress, Selenium, or RestAssured
• Strong expertise in API, UI, and integration testing
• Proficiency in CI/CD pipeline integration and optimization
• Skill in test strategy, risk analysis, and test architecture
• Advanced debugging, troubleshooting, and root cause analysis skills
• Solid understanding of database systems and advanced SQL
• Experience with observability and monitoring tools such as DataDog or New Relic
• Excellent cross-functional communication and mentorship skills
• Strong written and verbal communication skills and the ability to collaborate across functions

Compensation

Flex uses market-based pay that varies by work location tier, with starting pay depending on experience, qualifications, and internal leveling guidelines.

• Tier 1 (NYC/Bay Area, Los Angeles, Seattle): $136,000 – $170,000 USD
• Tier 2 (Austin, Washington D.C., Philadelphia, San Diego, Chicago, Atlanta): $122,400 – $153,000 USD
• Tier 3 (Salt Lake City and all other US cities): $115,600 – $144,500 USD

Additional Information

• Flex has employees across the US, Australia, Canada, and South America, emphasizes inclusion, and is an equal opportunity employer
• Roles in New York, San Francisco, and Salt Lake City are hybrid, with 2 to 3 on-site days per week; candidates outside these areas may be eligible for relocation assistance
• Candidates are asked whether they can attend in-person onboarding at the NYC headquarters Monday through Wednesday of their first week, with expenses covered under Flex’s travel policy
• Flex may use automated AI tools to evaluate applications and says they comply with local regulations, including bias audits; candidates can opt out through a linked request form
• For benefits, Flex points candidates to its careers page