Senior Ruby on Rails Engineer — Full-Stack & API Expert

Qualis1 Inc. is hiring a Senior Ruby on Rails Software Engineer to lead the design and development of large-scale full-stack web applications. The role focuses on Ruby on Rails, API design, and modern web technologies, with a strong emphasis on backend and frontend integration. The position is 100% onsite across multiple California and Texas locations, with a 12‑month duration. Candidates should have 8–10 years of experience and a proven track record in performance optimization and scalable