Senior Software Engineer, Backend

Prosper Marketplace

Senior Backend Engineer developing applications that guide borrowers through financial decisions at Prosper. Collaborating with cross-functional teams to enhance user experiences and drive business outcomes.

Posted 6/30/2026full-timeSan Francisco • California • 🇺🇸 United StatesSenior💰 $173,000 - $205,000 per yearWebsite

Tech Stack

Tools & technologies

CloudGoogle Cloud PlatformGraphQLJavaKotlinMicroservicesSpringSpring BootSpringBoot

About the role

Key responsibilities & impact

Own the borrower-facing experiences that drive Prosper's core business -- from rate check through funding.
Build and maintain the applications that guide borrowers through one of the most important financial decisions they'll make.
Directly impact conversion, borrower satisfaction, and Prosper's top-line growth.
Invest in AI to accelerate delivery, improve code quality, and explore new ways to enhance the borrower journey.
Collaborate within a cross-functional team that includes product, design, frontend engineering, and quality engineers to deliver seamless borrower experiences across web and mobile.
Own projects end to end -- from technical design and architecture through launch, iteration, and measurement -- driving outcomes that move the business forward.
Build and evolve high-performance Java and Kotlin microservices, deploying scalable features across the modern Spring Boot stack.
Partner with frontend and platform engineering teams to integrate client applications with secure, performant REST and GraphQL APIs.

Requirements

What you’ll need

BS in EE/CS with 8+ years of experience or MS in EE/CS or other applicable disciplines with 6+ years of experience
Deep proficiency in Java, Kotlin, and the Spring Boot framework, with the versatility to design, build, and scale distributed microservices.
Hands-on experience with RESTful APIs, GraphQL, and event-driven patterns (such as GCP Pub/Sub) to power high-performance applications.
Familiarity with cloud-native architectures (specifically GCP, Firestore, Spanner, and Cloud Functions) and modern CI/CD pipelines to maintain a high-velocity development environment.
Disciplined approach to automated testing (unit, integration, and contract tests) and system observability to ensure services are meticulous, secure, and trustworthy.
Active use of AI coding assistants (Cursor, Copilot) and a commitment to exploring new AI developments to enhance team productivity and solve product problems.
A proactive, high-accountability approach to driving projects to completion and unblocking yourself to deliver outcomes, not just outputs.
A deep focus on system reliability and financial accuracy, sweating the details to protect the "borrower behind the screen" and preserve trust in a regulated domain.
Excellence in cross-functional communication and a dedication to elevating the team through clear mentorship and knowledge sharing.

Benefits

Comp & perks

A competitive salary and a 401(k) with a 5% company match to help you build long-term financial security
We provide the resources you need to thrive, from flexible time off and paid parental leave to an annual wellness allowance and comprehensive health coverage
Take advantage of a suite of premium perks, including Udemy access, childcare assistance, pet insurance, and a bevy of additional savings through Beneplace

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

JavaKotlinSpring BootRESTful APIsGraphQLGCPFirestoreSpannerCloud FunctionsAutomated Testing

Soft Skills

Cross-Functional CommunicationMentorshipProactive Problem SolvingHigh AccountabilityTeam Collaboration