This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Principal Ruby on Rails Engineer based in the United States. This role offers the opportunity to design and deliver high-impact technology solutions within a collaborative, product-focused engineering environment.The position focuses on building and scaling secure, reliable backend systems that support critical financial products and services.You will contribute to architecture decisions, API development, platform optimization, and engineering best practices.Working closely with cross-functional teams, you will help shape innovative solutions while maintaining high standards for performance and quality.The role provides significant technical ownership, allowing you to influence engineering direction and mentor other developers.You will work with modern development practices and tools while solving complex challenges in a regulated technology environment.