Senior Software Engineer - Fullstack (Ruby on Rails)

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Software Engineer – Fullstack (Ruby on Rails) based in the United States. Join a mission-driven digital services team building secure, modern applications that improve how government agencies serve the public. As a Senior Software Engineer, you will contribute across the full software development lifecycle, combining strong Ruby on Rails expertise with React-based front-end development. You will work in small, cross-functional teams to transform complex business needs into accessible, reliable, and scalable digital solutions. Your work will support meaningful public-sector missions, including public health, financial regulation, immigration services, and identity and access management. Collaborating closely with product managers, designers, researchers, and fellow engineers, you will help deliver high-quality applications using modern cloud infrastructure and continuous delivery practices. This opportunity offers technical ownership, a calm and collaborative working environment, and the chance to make a tangible difference through technology.