Senior Rails Engineer

Mon Ami is seeking a Senior Engineer to design, build, test, and maintain core software relied on by customers daily. You will take ownership of a defined area of the codebase and work closely with product managers and a team of 1–3 junior engineers to deliver impactful projects for public-agency clients. The stack includes Ruby on Rails, Bootstrap, Stimulus, and Postgres.

Responsibilities are balanced between coding, code review, data model design, and mentoring.

• Take ownership of a defined area of the codebase, shipping production-grade Rails features end to end
• Write, review, and maintain code using Rails, Bootstrap, Stimulus, and Postgres (or similar frameworks)
• Support and mentor a team of 1–3 junior engineers, partnering with product managers to deliver projects and develop talent
• Operate with agility and initiative in a small, high-performing team environment
• Apply strong engineering practices, including thoughtful refactoring, careful data design, and disciplined testing (maintaining a 1.4:1 test-to-code ratio)
• Use AI-assisted development tools (such as Claude Code or Codex) to enhance development practices and productivity

• Have 3–5+ years of experience as a mid-level engineer at a fast-growing technology company
• Are fluent in Ruby on Rails, Stimulus, JavaScript, Bootstrap, CSS3, Hotwire/Turbo, RSpec, View Component, SQL/Postgres, Git, and SQL reporting tools
• Demonstrate strong engineering practices, including refactoring, data design, and testing
• Are a creative problem-solver who enjoys evaluating and integrating third-party software and APIs
• Have hands-on experience with AI development tools like Claude Code or Codex, and understand when to use each
• Are comfortable working within Agile methodologies
• Bonus:
  Experience with Terraform, AWS, Google Cloud, HIPAA-regulated products with PHI, or multi-tenant SaaS architecture

• Health insurance
• 15 days PTO (increasing to 20 days after two years) and sick leave
• 401K, disability insurance, FSA, and HSA
• Generous paid family leave
• The opportunity to do meaningful work with a respectful and kind team