Full-Stack Developer - Travel Agency SaaS (with AI)

We are looking for one strong developer to co-build a production SaaS with us — not a freelancer to disappear after delivery. You will work directly with the founder, with full architecture documentation provided from day one. About the project Profitmate is a multi-tenant SaaS platform for travel agencies. It manages bookings, invoicing, billing enforcement, AI-powered ticket normalization, and role-based access for agency staff and partners. Currently live in the Ethiopian market, with the roadmap targeting multi-region expansion — multi-currency, multi-timezone, and broader language support for ticket normalization. You will help architect and build that expansion alongside the founder. Stack Backend: Node.js · Express · PostgreSQL · Prisma / Sequelize Frontend: React · Vite · Tailwind CSS AI: Gemini API · OpenAI API Auth & Architecture: JWT · Multi-tenant What you will build • Multi-tenant auth system with 4 roles: Super Admin, Agency Admin, Partner, Accountant • AI ticket normalization pipeline — raw text in, structured PostgreSQL record out — with validation and retry logic across Gemini and OpenAI • Billing engine: invoice generation, billing enforcement middleware, usage tracking • Full React frontend with role-scoped dashboards, ticket management, and reporting • File upload handling for receipts, scoped per agency • Multi-region architecture: currency, timezone, and localization decisions to be made collaboratively The AI normalization piece (core feature) Travel agents paste raw ticket text — unstructured, inconsistent, sometimes messy. The system must parse it into a clean structured record using an LLM, validate the output against a schema, and retry with fallback logic if the model returns garbage. This is not a wrapper around ChatGPT. You need to design the prompt, the validation layer, the retry/fallback strategy, and the error handling. Experience with LLM output reliability in production is required. Who we need You are a fit if Not a fit if You have shipped AI features in production, not just demos You have only used AI APIs in side projects You are comfortable migrating from MongoDB to PostgreSQL You need every task fully specified before starting You write tests before calling something done You treat PostgreSQL like a new concept You can read existing code and make surgical changes You skip code review and testing You ask hard questions before building You disappear after delivery What you get • Complete architecture documentation and task tracker from day one • Direct access to the founder — no PMs, no middlemen • A real product with real users in a market with no dominant competitor • Flexible hours — we care about output, not when you work How to apply Send a short message covering three things: • One production AI feature you have shipped — what it did, how you handled LLM unreliability • Your experience with PostgreSQL and any ORM you have used • Your availability and rough rate