Senior Software Engineer, Upstart

• 5+ years of experience as a software engineer, with at least 1+ years in a senior or tech lead role
• Strong experience in at least one backend language such as Ruby or Kotlin
• Demonstrated experience building scalable APIs and services, ideally in production
• Proficiency with modern frontend technologies and frameworks (e.g., React, Vue, or similar)
• Comfort working in a full-stack environment, with experience shipping end-to-end features
• Experience with experimentation platforms, A/B testing frameworks, or data-driven decision-making
• Strong communication skills and a collaborative mindset

Desirable

• The Conversion Rate Optimization (CRO) team is focused on improving the borrower journey from application initiation through rate acceptance
• Our mission is to build fast, intuitive, and impactful user experiences that directly drive Upstart’s revenue by increasing conversion metrics
• We operate as a full-stack team and are deeply collaborative—engineers, product managers, and designers work closely to scope, build, and iterate on features that enhance our funding flow
• Our team thrives on curiosity and iteration
• We prioritize delivering atomic commits to accelerate development and reduce cognitive load
• Whether it’s implementing a new API endpoint or enhancing front-end performance, we’re committed to code quality and meaningful business impact
• As a Senior Software Engineer, you will be directly responsible for helping build critical functionality that impacts Upstart’s core business and help improve the user experience when completing applications, which translates into increased conversion metrics and revenue
• Design and implement user-facing features that streamline and enhance the loan funding experience
• Lead end-to-end development of experiments that help improve conversion rates across the funnel
• Partner closely with product and design teams to scope and deliver impactful features.Contribute to key architectural decisions as the team continues to modernize its platform and services
• Take ownership of feature development, from idea to measurement, working across the stack
• Help shape our technical culture through mentorship, documentation, and best practices
• Improve the observability and monitoring of our systems to ensure high-quality user experiences