Payments & serverless full-stack developer
- €66-€103/hr
- Full time
- 11 years
- Payment integration
- Next.js
- Serverless functions
- Webhooks
- PostgreSQL
- TypeScript
Portfolio site
example.test/amara-alder-0 (opens in a new tab)
Hosted elsewhere. We link to it but never read it, so it does not feed matching.
Projects 2
Subscription checkout rebuild
Contract developer
Replaced a hand-rolled checkout with Stripe Checkout + webhook reconciliation. Failed payments fell from 4.1% to 0.6% over two months.
- typescript
- payment-integration
- nextjs
- webhooks
Webhook retry worker
Sole developer
Queue-backed retry with exponential backoff and a dead-letter table. Cleared a backlog of ~12k unprocessed events.
- typescript
- serverless
- postgresql
- nextjs
About
I build checkout and billing flows that survive contact with production: signed webhooks, idempotent replay, and reconciliation you can audit. Mostly Next.js on Vercel with Postgres behind it.