Sr. Software Engineer in Test (SDET)
Prosper Marketplace
Software Engineering
San Francisco, CA, USA
USD 151k-180k / year
Posted on Jan 15, 2026
Your role in our mission
We are seeking a Software Development Engineer in Test with strong functional testing expertise and automation skills using modern technologies. The ideal candidate thrives in an agile environment, works independently, and can lead test verification efforts for complex projects.
How you’ll make an impact
- Drive quality throughout feature development by designing and implementing test standards, processes, and methodologies
- Collaborate with SDET managers to establish quality standards across teams, including test management, regression testing, and test strategy design
- Execute comprehensive testing at multiple levels: functional verification, regression testing, compatibility, and performance testing
- Support production releases, monitoring, incidents, and patch verifications
- Build and maintain automation frameworks (UI and API/Services) for web and mobile applications using Appium/Selenium and other tools
Skills that will help you thrive
- 5+ years software QA/Software Verification experience with strong knowledge of test methodologies and documentation
- BSCS degree or equivalent required
- Proficiency in Java or similar automation frameworks (such as Selenium, Appium, JUnit, or equivalent) for Web, Mobile, and API testing
- Solid knowledge of SQL Server database and API/services level testing
- Strong Python scripting/programming skills
- Full usage of AI coding tools at work (Copilot, Claude, etc.)
- Mobile app testing and troubleshooting experience including experience in testing react-web/native applications
- Working knowledge of performance and security testing for web, mobile and APIs
- Strong analytical, troubleshooting, and organizational skills with attention to detail
- Ability to prioritize effectively, work independently on complex issues, and lead large projects
- Experience working with globally distributed teams
- Curious mindset with ability to learn new technologies and tool sets
- Experience creating test strategies and maintaining test suites for complex systems
What we offer
- The opportunity to collaborate with a team of creative, fun, and driven colleagues on products that have an immediate and significant impact on people’s lives
- The opportunity to work in a fast-paced environment with experienced industry leaders
- Flexible time off, comprehensive health coverage, competitive salary, paid parental leave
- Wellness benefits including access to mental health resources, virtual HIIT and yoga workouts
- A bevy of other perks including Udemy access, childcare assistance, pet insurance discounts, legal assistance, and additional discounts.
Interview Process
- Recruiter Call: A brief screening to discuss your experience and initial questions.
- Technical Interview: Deeper dive into coding skills.
- Team/Virtual Interview: Meet team members for collaborative discussions, problem-solving, or technical exercises.
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About Our Technology Team
We are growing our Technology team to support our various financial products. The ideal candidate is passionate about learning the Fintech domain and delivering cutting-edge, high-quality solutions to solve business problems. We utilize a progressive, test-driven, Agile development methodology that places a high premium on communication, teamwork, sound design and clean implementation.
About Us
Founded in 2005 as the first peer-to-peer marketplace lending platform in the U.S., Prosper was built on a simple idea: connect people who want to borrow money with those who want to invest. Since inception, Prosper has helped more than 2 million people gain access to affordable credit with over $27 billion in loans originated through its platform. Our mission is to help our customers advance their financial well-being through a variety of products. Our diverse culture rewards accountability and cross functional teamwork because we believe this encourages innovative thinking and helps us deliver on our mission.
We’re on a mission to hire the very best, and we are committed to creating exceptional employee experiences where everyone is respected and has access to equal opportunity. We realize that new ideas can come from everywhere. It is important to us that every hire connects with our vision, mission, and core values. Join a leading fintech company that’s democratizing finance for all!
Our Values
Diversity expands opportunities
Collaboration creates better solutions
Curiosity fuels our innovation
Integrity defines all our relationships
Excellence leads to longevity
Simplicity guides our user experience
Accountability at all levels drives results
Applicants have rights under Federal Employment Laws.
California applicants: please click here to view our California Consumer Privacy Act (“CCPA”) Notice for Applicants, which describes your rights under the CCPA.
At Prosper, we're looking for people with passion, integrity, and a hunger to learn. We encourage you to apply even if your experience doesn't precisely match the job description. Your unique skill set and diverse perspective will stand out and set you apart from other candidates. Prosper thrives with people who think outside of the box and aren't afraid to challenge the status quo. We invite you to join us on our mission to advance financial well-being.
Prosper is committed to an inclusive and diverse workplace. All aspects of employment including the decision to hire, promote, discipline, or discharge, will be based on merit, competence, performance, and business needs. We do not discriminate on the basis of race, color, religion, marital status, age, national origin, ancestry, physical or mental disability, medical condition, pregnancy, genetic information, gender, sexual orientation, gender identity or expression, veteran status, or any other status protected under federal, state, or local law, including the San Francisco Fair Chance Ordinance. Prosper will consider for employment qualified applicants who are non-US citizens and will provide green card sponsorship.
151000 - 180000 USD a year
The salary for this position is $151,000 - $180,000 annually, plus bonus and generous benefits. In determining your salary, we will consider your location, experience, and other job-related factors.