Senior Full-Stack Developer (TypeScript · Next.js · Supabase · React 19) $$$$

About the role

We are looking for a Senior Full-Stack Developer to join as the first dedicated engineering team member and work directly with the founding team.

This is a hands-on role with strong architectural ownership across multiple production SaaS products. You’ll be involved in shaping system design, building new features, and improving reliability across the stack.

• Workload: 20–30 hours/week initially, with potential to scale

Requirements

• Strong experience with TypeScript (strict mode)
• Solid expertise in React (preferably React 19) and Next.js (App Router)
• Hands-on experience with Supabase (PostgreSQL, RLS, Edge Functions)
• Experience building and maintaining full-stack applications
• Strong understanding of API design, validation, and error handling
• Experience with relational databases, migrations, and query optimization
• Experience working with background jobs / async workflows
• Ability to work in an async, documentation-heavy environment
• Strong ownership mindset and ability to make architectural decisions

Will be a plus

• Experience with multi-tenant SaaS architectures
• Familiarity with Inngest or similar workflow orchestration tools
• Experience with real-time systems, voice or AI integrations
• Experience with Supabase Auth and RLS policies
• Knowledge of Redis (Upstash)
• Experience with Sentry or similar monitoring tools
• Experience integrating third-party APIs (CRM, telephony, etc.)
• Understanding of HIPAA-compliant systems

• Experience with tools like Twilio, Telnyx, Vapi, GoHighLevel, EasyPost

   

Responsibilities

Product Development

• Build new product modules based on architectural specifications
• Implement UI features and fix bugs across dashboards and interfaces
• Develop internal tooling and test harnesses for feature validation

Integrations & Orchestration

• Integrate and manage multiple external providers (AI, voice, APIs)
• Build reliable webhook pipelines (ingest, deduplication, processing)
• Implement CRM and third-party service integrations
• Work on campaign management logic (retry handling, orchestration, etc.)

Backend & Data

• Develop API routes with proper validation and error handling
• Implement background jobs and durable workflows
• Work with database migrations, RLS policies, and RPC functions

Project description

You will work across multiple production SaaS products that share a unified technical stack:

• Primary product (~70%):
  A multi-tenant AI platform for sales intelligence and conversation analytics with active clients and ongoing feature development. This is the most complex system with heavy integration and backend logic.
• Secondary product (~30%):
  A B2B healthcare portal focused on clinic workflows and order routing. The system includes role-based access, audit logging, and integrations with external providers.
• Additional product (as needed):
  An audience intelligence platform that is stable in production, requiring occasional feature updates and maintenance.

Core stack across all projects:
Next.js (App Router), React 19, Supabase (PostgreSQL, RLS, Edge Functions), TypeScript (strict mode), Tailwind CSS.