Senior Software Engineer, Backend

Jobtailor; San Francisco (CA); On-site; USD 120,000 - 160,000; Full time

Benefits offered by this job

Take-what-you-need vacation

Stock options

401K retirement savings plan with matching

Comprehensive health, dental and vision insurance

Prosper Fit stipend for gym memberships

Pre-tax commuter/parking assistance

Monthly meet-and-greet happy hours

Job summary

Prosper Marketplace is seeking a Senior Backend Engineer to lead the development of borrower-facing applications within the Personal Loans team. This role involves using Java and Kotlin to build high-performance microservices on a modern Spring Boot stack.

The ideal candidate will have extensive experience in backend development, cloud-native architectures, and the ability to leverage AI tools to enhance productivity. The position is based in San Francisco, California, and offers a culture that values innovation and collaboration.

Qualifications

• 8+ years of backend engineering experience.
• Deep proficiency in Java and Kotlin.
• Experience with cloud-native architectures, especially GCP.

Responsibilities

• Own the borrower-facing experiences and applications.
• Design modern event-driven architectures for product teams.
• Identify and drive improvements in system latency and efficiency.

Skills

Java

Kotlin

Spring Boot

RESTful APIs

GraphQL

AI coding assistants

CI/CD pipelines

Cloud-native architectures (GCP)

Education

BS in EE/CS or related field with 8+ years of experience

MS in EE/CS or related field with 6+ years of experience

Job description

• As a Senior Backend Engineer on the Personal Loans team, you will own the borrower-facing experiences that drive Prosper’s core business — from rate check through funding
• Using modern web and mobile technologies, you will build and maintain the applications that guide borrowers through one of the most important financial decisions they’ll make
• Your work will directly impact conversion, borrower satisfaction, and Prosper’s top-line growth
• We are investing heavily in AI across our engineering organization — from AI-assisted development workflows to intelligent borrower experiences
• You’ll be joining a team that actively embraces AI tools to accelerate delivery, improve code quality, and explore new ways to make the borrower journey smarter and more personalized
• 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

Benefits

• Take-what-you-need (paid) vacation for salaried employees
• 20 days of PTO and 7 paid holidays/year for hourly employees
• Stock options
• 401K retirement savings plan with generous matching
• Comprehensive health, dental and vision insurance plans, with options specific to your own health coverage needs
• Prosper Fit - A monthly stipend to use for gym memberships, personal training sessions, yoga and exercise classes, or club sports/fitness fees
• Pre-tax commuter/parking assistance
• Snacks and beverage selections in our kitchen
• Monthly meet-and-greet happy hours
• Perkspot discount programs
• One Medical
• SF Location - Rooftop deck with ping-pong and foosball table

• Quality & Testing Rigor: Disciplined approach to automated testing (unit, integration, and contract tests) and system observability to ensure services are meticulous, secure, and trustworthy
• Senior Engineering Expertise: BS in EE/CS with 8+ years of experience or MS in EE/CS or other applicable disciplines with 6+ years of experience
• User-Centric Advocacy: 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
• Enterprise Backend Mastery: Deep proficiency in Java, Kotlin, and the Spring Boot framework, with the versatility to design, build, and scale distributed microservices
• Modern Cloud Infrastructure: Familiarity with cloud-native architectures (specifically GCP, Firestore, Spanner, and Cloud Functions) and modern CI/CD pipelines to maintain a high-velocity development environment
• Collaborative Leadership: Excellence in cross-functional communication and a dedication to elevating the team through clear mentorship and knowledge sharing
• AI-Forward Mindset: Active use of AI coding assistants (Cursor, Copilot) and a commitment to exploring new AI developments to enhance team productivity and solve product problems
• Robust Data Integration: Hands-on experience with RESTful APIs, GraphQL, and event-driven patterns (such as GCP Pub/Sub) to power high-performance applications
• Extreme Ownership: A proactive, high-accountability approach to driving projects to completion and unblocking yourself to deliver outcomes, not just outputs