Sr. Software Engineer, Backend

Prosper Marketplace is a leading fintech company dedicated to advancing financial well-being through innovative personal finance solutions. They are seeking a Senior Backend Engineer to own borrower-facing experiences, using modern technologies to build applications that drive Prosper's core business. The role involves collaborating with cross-functional teams, managing projects end-to-end, and leveraging AI tools to enhance development processes.

Responsibilities:

• 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 our high-performance Java and Kotlin microservices, deploying scalable features across our modern Spring Boot stack
• Design modern event-driven architectures (like GCP Pub/Sub) that accelerate development across multiple product teams
• Partner with frontend and platform engineering teams to integrate client applications with secure, performant REST and GraphQL APIs
• Identify and drive improvements in system latency, database query optimization, testing coverage, and cloud infrastructure efficiency
• Uphold high standards of code quality and user experience while iterating rapidly in a regulated environment
• Leverage AI-powered tools (coding assistants, automated testing, code review) to amplify your productivity and help establish best practices for AI-assisted development across the team
• Contribute to a strong, inclusive engineering culture by mentoring peers, championing best practices, and participating in thoughtful code reviews

Requirements:

• 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