Sr. Software Engineer (Backend)
Prosper Marketplace
Software Engineering
San Francisco, CA, USA
Posted on Aug 26, 2025
At Prosper, the Foundation team is the foundation upon which all our product innovation is built. We are the force multipliers for the entire engineering organization, responsible for creating the tools, services, and shared libraries that enable our product teams to build, ship, and run software quickly, reliably, and securely. Our customers are Prosper’s own engineers, and our mission is to enhance their productivity and experience.
We are seeking a motivated and experienced platform engineer to join our interdisciplinary team. The ideal candidate has a passion for building robust, scalable, and easy-to-use services and frameworks for other developers. You thrive on solving complex architectural challenges and find satisfaction in enabling the success of your engineering partners. Above all, you want to be part of a culture of innovation and creativity as we build the core of our financial technology!
Technologies we use: Java, Kotlin, SpringBoot, REST APIs, NodeJs, Microservices, Python, GraphQL, React, Javascript, GCP
This role is a HYBRID opportunity, based two-days a week (Wednesday & Thursday), from our San Francisco office.
Problems You Will Solve
- Design, build, and maintain the core shared libraries and frameworks (e.g., our internal Spring Boot library) used by all backend services at Prosper.
- Develop and own foundational, cloud-native microservices that provide common business capabilities to the entire organization, such as our central Security, Document, and Communication services.
- Act as a key partner and consultant to product engineering teams, guiding them on best practices for architecture, reliability, and the effective use of our platform services.
- Partner closely with the SRE team to ensure our core services and libraries integrate seamlessly with the company’s CI/CD pipelines, infrastructure, and observability platforms.
- Proactively identify and address systemic gaps in our architecture, processes, and tooling to reduce complexity and improve operational excellence for all developers.
- Drive the migration of legacy systems to modern, cloud-native patterns on GCP.
- Contribute to shaping our company’s engineering culture by setting standards, writing clear documentation, and championing best practices.
All About You
- BS in EE/CS with 8+ years of experience or MS in EE/CS or other applicable disciplines with 6+ years of experience.
- Proven experience working on a platform, foundations, or core services team is strongly preferred.
- Strong grasp of computer science fundamentals, including algorithms, object-oriented design, and distributed systems architecture.
- Expert-level proficiency in Java and the Spring Boot ecosystem, with specific experience designing, building, and distributing shared libraries or frameworks.
- Deep experience designing and building RESTful APIs and event-driven systems to be consumed by multiple engineering teams.
- Hands-on expertise with both relational and non-relational databases (e.g., Firestore, Redis, MemoryStore).
- Experience developing and operating services in a modern cloud environment (GCP or AWS) that utilizes CI/CD, containerization (Docker, Kubernetes), and infrastructure-as-code.
- Expertise in Authentication and Authorization solutions (e.g., OAuth2, OIDC, JWT).
- Familiarity with how backend APIs are consumed by various clients (e.g., front-end web, mobile, other services).
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.
#LI-AW1
#IND1
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 including personal loans, credit, home equity lines of credit (HELOC), and our newest product, HELoan. 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: https://www.prosper.com/plp/legal/privacy-notice-for-applicants/
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.