Sep 2022 to Mar 2023·Tech Lead · 12-person team, 4 markets
TUI Group: Checkout for 20M+ Customers
Tech Lead for the global checkout system at the world's largest tourism company (€23B revenue). 12-person team, 4 markets, +40% reliability, promotion recommended.
Global checkout, at scale
20M+
annual customers
5M+
annual bookings
25
microservices
99.9%
uptime
Tech lead, 12 people, 4 markets
TUI Group is the world’s largest tourism company, €23B in annual revenue. I led
their global checkout team: 12 people, 4 European markets, coordinated
remotely from Brazil.
What shipped
Delivered
✓Required:
Multi-currency checkout across 4 European marketsProcessing 5M+ annual bookings with localized payment flows.
✓Required:
Compliance across 8 European jurisdictionsEach market's tax, currency, and regulatory rules encoded into the flow.
✓Required:
25-microservice architectureTypeScript, Node.js, Vue.js, PostgreSQL on AWS.
✓Required:
+40% reliability, reaching 99.9% uptimeServing 20M+ annual customers with no regression.
Ambiguity scales with team size
Every business decision that wasn’t specified became a bug in production.
A 12-person team across 4 markets amplifies that cost fast.
This is why I now practice Spec-Driven Development.