Full-Stack Engineer (Backend)

Full-Stack Engineer With A Backend Focus

We're building a greenfield web platform that delivers modern, cloud-based experiences aligned with Sensei Cloud. The application is modular in nature and will grow over time.

As a Full-Stack Engineer with a backend focus, you will be a core contributor shaping the Rails API, data layer, and Azure platform integrations from the ground up — while remaining capable of working across the entire stack when needed. Your primary ownership area is the backend: data modeling, API design, data mapping across dental practice management systems (DPMS), external healthcare system integrations, and background processing. You will interact with Azure Cosmos DB for DPMS data and leverage Azure PostgreSQL Hyperscale (Citus) to host application data at scale. You will also contribute to frontend work as the team and product evolve.

This is a full-product ownership role in a HIPAA-regulated healthcare environment, requiring strong technical judgment, attention to compliance, and close collaboration with your fellow engineers and product stakeholders.

You will work within a Human -> AI -> Human engineering workflow, using AI tools to accelerate delivery while maintaining full accountability for correctness, security, and compliance.

Primary (Backend)

• Design, build, and maintain a Rails API (API-only mode) that serves dental scheduling data to a React frontend
• Model and evolve PostgreSQL schemas using ActiveRecord migrations, targeting Azure PostgreSQL Hyperscale (Citus) in production with an emphasis on clarity, performance, and data integrity
• Become the team's subject matter expert on data mapping across different dental practice management systems and the Cosmos DB data layer
• Query and consume data from Azure Cosmos DB, understanding its document model and how DPMS data is structured within it
• Design and maintain application schemas on Azure PostgreSQL Hyperscale (Citus), leveraging distributed tables and colocation for performance at scale
• Integrate with external healthcare systems and services via — including dental exchange APIs, payment processors, and Azure AI services — to power features such as AI-assisted dictation and intelligent workflows
• Implement and maintain Azure AD B2C JWT authentication middleware, including JWKS retrieval, signature verification, claim extraction, and current_user injection
• Build and operate background jobs using Sidekiq and Redis for asynchronous and long-running tasks
• Write and maintain comprehensive RSpec test suites using FactoryBot, WebMock, and VCR to safely test external integrations
• Run and remediate findings from Brakeman and bundler-audit as part of normal development workflows

Shared (Full-Stack)

• Contribute to React frontend components and pages as needed
• Collaborate closely with frontend-focused engineers and product stakeholders throughout feature development
• Participate in AI-augmented development workflows, reviewing and validating AI-generated code against acceptance criteria
• Follow Git best practices: feature branches, pull requests for all changes, and conventional commit messages
• Proactively update documentation when behavior or architecture changes