Senior Full Stack Developer - AI First

About this role

About RethinkFirst

ReThinkFirst is on a mission to inspire hope and power potential. Founded in 2008 and headquartered in NYC, RethinkFirst is a pioneer and market leader in behavioral and mental health technology.

Developed by nationally recognized experts in the field, Rethink’s award-winning online solutions feature comprehensive video-based training and education programs and a sophisticated behavior intervention planning tool for individuals and caregivers. Rethink’s offerings include individualized assessments, online skills-based activities, access to remote clinician-led consultations, and more.

The Rethink First platform is used by Fortune 500 companies, school districts, government agencies, public and private behavioral health providers, and families caring for individuals with developmental disabilities worldwide.

We are hiring for a Full-Stack Senior .NET Developer to help deliver cloud-based applications and infrastructure to our growing customer base. The candidate will develop, design, test and deploy websites as well as support and maintain existing functionality. They should be experienced and productive with Microsoft development technologies, have a solid understanding of design patterns, object orientated programming and SOLID best practices. We take an AI-first approach to engineering: AI coding tools are the default way we work, and we expect developers to reach for them first on everything from scaffolding and refactoring to debugging, testing, and code review. Experience in health IT or insurance industry a plus.

Technology stack

• C#, .NET & .NET Core, SQL, Redis, Web API, JavaScript, HTML/CSS, Angular, TypeScript, Microservices, XUnit, Azure, CI/CD, Git, NGRX, OAuth.
• AI Tooling: Cursor, Claude, GitHub Copilot.
• Preferred Skills: Azure DevOps, Docker, Kubernetes, Terraform.

Responsibilities

• Design and build applications, micro-services, and infrastructure for the Rethink First platform.
• Ensure the performa...