PRACTICE LAB

Event indexer with reconciliation

Ingest events, retry safely, drop duplicates, and reconcile against a second source.

Independent Blockchain Lab preparation exercise. Not an employer assessment or a guarantee of selection.

What to produce

• Runnable local demo
• README
• Architecture note
• Tests
• Decision log
• Known limitations
• Short demo script

The runnable piece on this site is the linked Forge or Canon surface, on synthetic or public data. Open it.

Dossiers that point here

• Galaxy: VP, Senior Backend Developer - Blockchain Infrastructure
• Coinbase: Senior Software Engineer- Blockchain Network
• LayerZero Labs: Backend Engineer
• BitGo: Senior Software Engineer - Accounting & Ledger Systems
• FalconX: Senior Trading Systems Developer
• Superstate: Staff Backend Engineer
• MoonPay: Senior Blockchain Engineer