Everything I've built.

A shared-expense platform where the hard part is not the arithmetic but the invariants: members join and leave over time, four different split modes have to agree, and every mutation has to stay auditable.

An equity-research system built as an explicit state graph. Research fans out into parallel analysis, a thesis is drafted, and a reviewer node can send it back — a bounded critique loop rather than one prompt and a hope.

End-to-end encrypted messaging where the private key never leaves the browser. The server relays ciphertext and wrapped session keys, and holds nothing it could decrypt.

A six-stage pipeline that generates, cleans, models and serves flight-delay predictions. Every stage is idempotent, so a rerun converges instead of duplicating.

Retail transactions streamed through Kafka into Spark Structured Streaming, staged on S3 so batches can be replayed, then loaded into Redshift under Airflow orchestration.

A multi-worker crawler where the interesting problem is coordination: a shared frontier, a shared visited set, and politeness rules that must hold across every worker at once.