Keel

On Intouch, Redis going down is a non-event. Every cache operation is wrapped in graceful degradation: on a miss or an outage the app falls through to the database — slower, never broken. Tiered TTLs tune each domain; pattern-based invalidation keeps data fresh; rate limiting bypasses rather than blocks when the cache is unreachable. Availability is a design decision, made everywhere.

Payment systems earn trust in their failure paths. On PM Competitions, tickets are pre-allocated with row-level locking, payment confirms them, and any failure — a declined card, a dropped connection — rolls the allocation back automatically. On EVÖQ, every Stripe webhook is logged with a unique event ID: duplicates are ignored, failures preserved and replayable. No duplicate tickets, no phantom orders, no ambiguous states.

LOCKD moves 5GB files with zero job queues, zero message brokers, zero persistent workers. Uploads pick one of three tiers — presigned, chunked multipart, streaming — so file bytes never burden the API server. ZIP archives stream from bucket to bucket through Lambda with no intermediate buffering, reporting back by webhook. Stale jobs are detected lazily on the read path. The developer experience of a job queue, with none of the infrastructure.

We put security where application bugs can't undo it. Row-level security on every table, so even a compromised API can't leak data across users. Draw logic in stored procedures, out of reach of the application layer. PIN login hardened against timing attacks — every comparison runs in parallel, so response time reveals nothing. Files identified by magic bytes, not by the extension an attacker chose.