Senior Backend Software Engineer

CardFlight

full-time

Posted on: 8/27/2025

Location: 🇺🇸 United States

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💰 $160,000 - $190,000 per year

Senior

AWSMicroservicesRubyRuby on RailsTypeScript

About the role

Design, create, and support backend systems for transaction processing and settlement
Collaborate with a team of engineers to continuously build, ship, learn, and iterate on products
Stay up-to-date with new technologies and best practices in backend software development
Ensure product stability through testing and development of best practices
Design and implement robust services and APIs for long-term scalability and maintenance
Assist in refactoring existing code to improve performance, security, and maintainability
Mentor and develop a high-performing team of engineers and set technical direction
Support operations with customer-facing technical issues and collaborate with third parties on code certifications
Work on CardFlight's SwipeSimple payments platform used by 125,000+ small businesses

5+ years of backend software development; experience with the payments industry and/or payment processor integrations is a plus
Experience mentoring and coaching less experienced engineers
Experience designing and building quality and highly scalable applications
Proven track record of delivering complex projects with high quality within timelines
Superior communication and collaboration skills and interest in working with third parties
Ability to motivate, coach, and provide guidance to the team
Ability to be flexible and flourish in a fast-paced atmosphere while remaining focused with an attention to detail, working productively, and successfully juggling multiple tasks
Familiarity with Ruby on Rails, Typescript, C#, AWS, and GitHub Actions (infrastructure/CI/CD) (as used by the team)