Senior Full-Stack Developer (TypeScript / Supabase / Postgres)

I'm the founder of Munga Plains (www.mungaplains.com), a yoga-retreat and safari business operating a lodge in Botswana and a travel company in Switzerland. We sell retreat packages B2B to retreat leaders, who resell them to their own clients. Over the past months I've built a custom platform that replaced our entire off-the-shelf stack — booking system, property management (PMS), trip management (TMS), CRM with automated outreach, and a full double-entry finance/GL system. It runs the business today. I built it myself with heavy AI assistance, and I now need a senior developer to work alongside me: shipping features, hardening what exists, and bringing engineering discipline that a solo founder-built codebase inevitably lacks. The stack (all real, all in production): TypeScript monorepo (npm workspaces): React 18 + Vite apps (lodge PMS, travel TMS, finance) and Next.js apps (public website + booking, CRM) Supabase/Postgres backend: significant business logic lives in SQL — Postgres functions, triggers, and extensive row-level security Integrations: Stripe (checkout, webhooks, payouts), Wise & Revolut bank sync, Gmail OAuth send/reply, Resend, Cloudinary, DocuSeal/DocuSign, QuickBooks export, LLM-powered CRM agents (Anthropic API) Vercel hosting, GitHub Actions CI, Supabase Edge Functions (Deno) Honest disclosure about the codebase: it was built fast, by one person, with AI. It's broad and it works — there's also real technical debt, documented candidly in the repo: 560+ SQL migrations with hygiene issues, uneven test coverage (strong in CRM, thin in finance), past production incidents around the ledger, and a pile of one-off fix scripts. If reading that makes you want to run, this isn't for you. If it makes you want to bring order to something real and revenue-generating, keep reading. What you'll actually do: Ship features across booking, TMS, and finance (current roadmap: retreat operations tooling and replacing our last third-party booking dependency) Harden the money paths: booking→Stripe→invoice→ledger flows, webhook idempotency, migration discipline, financial invariant checks Untangle and incrementally refactor — no big rewrites; this system runs live operations and holds real financial data Work directly with me (founder). No PM layer, no meetings culture. Async-first, high autonomy. Must-haves: Senior-level TypeScript + React (both Vite and Next.js App Router in this codebase) Deep Postgres: you're comfortable reading and writing PL/pgSQL, triggers, and RLS policies — much of this system's logic is in the database, not the app layer Supabase experience (or willingness to get deep fast: RPCs, Edge Functions, service-role vs. anon patterns) Experience with payment/webhook reliability (Stripe or similar) — idempotency, race conditions, reconciliation Understanding of double-entry accounting data models, or strong interest in learning (our GL is custom-built) Discipline around production data: migrations, backups, rollback thinking. One bad migration here corrupts real bookings and real ledgers. Comfort working in an AI-assisted codebase: pragmatic about inconsistency, good at adding tests around critical paths before changing them Nice-to-haves: travel/hospitality domain (PMS/TMS), banking APIs (Wise/Revolut), Gmail API/OAuth, GitHub Actions, QuickBooks, LLM/agent workflows. Process: short call → paid trial project (~$500 for one bounded real task from our backlog, 10–20 hours) → ongoing hourly engagement. To apply, answer the screening questions below. Applications that don't address them specifically will be skipped. Start your proposal with the word "Mokoro" so I know you read this far.