Senior Node (70%)/React (30%) Developer (USD 4K/month CONTRACTOR) — Latin America

• Frontend: React 18, TypeScript/JavaScript, Material UI (MUI), Vite

• Backend: Node 22, TypeScript, Express, running on Google Cloud Functions

• Database: Firestore (Firebase) -- our only database

• Cloud: Google Cloud Platform -- Pub/Sub, Cloud Scheduler, Cloud Storage, Cloud Run

• Infrastructure as code: Terraform; CI on GitHub Actions

• Data and analytics: BigQuery warehouse, Amplitude, Mixpanel

• Payments: Stripe, including Stripe Connect

• Healthcare integrations: insurance claims and eligibility over X12 EDI (837, 270/271, 276/277, 835) through clearinghouses (Change Healthcare/Optum, Stedi, Orbit)

• Messaging and support: SendGrid (email), Twilio (SMS), Intercom

• AI: OpenAI for parsing documents; the team also uses AI coding tools (Claude Code, Codex) every day