Senior Software Engineer II (Ruby on Rails)

We’re looking for a Senior Software Engineer II to join our Engineering team. This role is ideal for someone who thrives in a pragmatic environment — able to reduce scope intelligently, mentor junior developers, and design maintainable, efficient solutions that deliver value quickly. You’ll be part of a supportive, inclusive team that values collaboration, transparency, and continuous improvement, working with ownership and accountability while fostering a culture of empathy, inclusivity, and continuous learning.

• Design and implement efficient, maintainable backend systems aligned with business needs

• Ensure code quality, reliability, and performance through testing, reviews, and best practices

• Work within and extend existing architectural patterns for seamless integration

• Write clear documentation to support deployment, maintenance, and knowledge sharing

• Participate in code reviews, demos, and sprint reviews, contributing to engineering excellence

• Mentor junior engineers, sharing best practices and guiding technical decisions

• Collaborate with product and design to translate requirements into reliable, scalable solutions

• Proactively seek opportunities to reduce scope or streamline development without losing user value

• Extensive years of backend development experience with production-grade systems

• Strong expertise in Ruby on Rails, NodeJS, React/TypeScript, REST/GraphQL APIs, Kafka, PostgreSQL

• Deep understanding of distributed systems, microservices, and serverless patterns

• Experience mentoring engineers and setting technical directions

• Ability to make smart trade-offs and simplify complexity without losing quality

• Background in working with and evolving established backend architectures

• Pragmatic mindset focused on performance, maintainability, and readability

• Clear communicator with strong documentation skills

• Collaborative team player with cross-functional experience

• Bonus: familiarity with Angular and Golang.

UserTesting is an Equal Opportunity Employer and a participant in the U.S. Federal E-Verify program.  Women, minorities, individuals with disabilities and protected veterans are encouraged to apply.  We welcome people of different backgrounds, experiences, abilities and perspectives.  UserTesting will consider qualified applicants with criminal histories in a manner consistent with the San Francisco Fair Chance Ordinance, as applicable.