Sr. Full Stack Engineer; Remote

Conexess Group is aiding a large healthcare client in their search for a Senior Full Stack Engineer in a remote capacity. This is a direct hire opportunity with a competitive compensation package. Please note we are unable to provide sponsorship or work c2c for this role.

• Ship a production-ready web application on Next.js/Vercel
• Ship production-ready iOS and Android apps with React Native/Expo
• Deliver AI functionality as a primary product capability, not a future add-on
• Integrate with Athena, Postgres/Neon, dbt, Snowflake, and selected Azure services
• Stand up and govern the team’s SDLC, release process, security controls, and observability
• This is not a generic full-stack role. It is a hands‑on product engineering lead role with direct responsibility for delivery quality, AI architecture, release readiness, and post‑launch maintainability.
• Use Vercel AI Gateway to control provider access, budgets, monitoring, fallbacks, and request‑level data handling
• Decide when to use gateway‑managed routing, when to use BYOK, and when to keep a sensitive workflow on a restricted provider path
• Build AI flows that are safe for patient‑facing use cases, including guardrails around sensitive content, escalation, and overconfidence
• Treat AI quality and safety as an engineering discipline, not an experimental side‑project

• Web: Next.js on Vercel
• Mobile: React Native + Expo + Expo Router + EAS Build / EAS Submit
• AI: Vercel AI Gateway first, with selective use of direct/provider‑hosted models where governance or enterprise agreements require it
• Backend: Vercel server‑side execution patterns with Type Script APIs and business logic
• Database: Postgres on Neon, with serverless‑safe connection strategy
• Integrations: Athena / FHIR / OAuth‑secured healthcare workflows, data flows into dbt and Snowflake, and selective Azure services

• 6+ years of professional software engineering experience in product environments
• Strong production experience with Next.js on Vercel
• Strong production experience with React Native + Expo
• Must have personally supported submission to Apple App Store and Google Play
• Must have shipped at least one user‑facing AI feature in production
• Must be comfortable using Vercel AI Gateway or a comparable gateway/orchestration layer
• Must understand streaming, tool calling, structured outputs, and human fallback patterns
• Must be able to stand up prompt/version control, regression testing, quality review, and failure analysis
• Must be able to design AI experiences that work well on mobile and web
• Must know how to evaluate vendors and features for BAA availability, retention, logging, geography, and stateful storage
• Must know how to separate PHI‑sensitive flows from lower‑risk flows and minimize data sent to models when full PHI is unnecessary
• Must be able to own APIs, auth flows, server‑side business logic, and integration boundaries
• Must know how to share code where it helps and split code where it protects UX and velocity
• Must have owned delivery of at least one consumer‑grade or patient‑facing product release
• Must be willing and able to serve as a hands‑on lead builder, not only a coordinator or manager

• Direct experience with patient‑facing healthcare applications
• Direct experience with Athena, FHIR, or SMART on FHIR
• Hands‑on use of Vercel AI Gateway
• Experience with Azure‑hosted model deployments or tightly controlled enterprise model routing
• Experience with Turborepo / monorepo setups spanning Next.js and Expo
• Experience implementing accessibility expectations consistent with WCAG 2.2
• Familiarity with OWASP ASVS, OWASP MASVS, or equivalent practical app‑security baselines
• Experience implementing AI evaluation pipelines, prompt registries, and staged rollouts