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Build an Indexer for an On-Chain DeFi Analytics Product

FreeVerified credential3 weeksAdvanced

Overview

What this challenge is about.

Build a TypeScript indexer for DeFi analytics, decoding 40+ events with reorg handling and zero data loss. Get a verifiable certificate.

The scenario

The SaaS (around USD 6M ARR, 22 institutional customers paying USD 25k+/year) currently runs a Node.js cron that misses events and produces support tickets weekly.

CredentialBlockchain-anchored
ShareableLinkedIn-ready
LanguageEnglish
PaceSelf-paced

The Brief

What you'll do, and what you'll demonstrate.

Build a reorg-safe DeFi indexer that stays within 2 blocks of tip across 6 protocols on Ethereum + Arbitrum with zero event loss across a 30-day replay.

Earning criteria — what you'll demonstrate

  • Build a reorg-safe blockchain indexer in TypeScript
  • Decode ABI events idempotently into a relational schema
  • Handle network + RPC failures with backoff + retry patterns
  • Document the indexer's failure modes for operations

Program Fit

Where this fits in your program.

Sharpens the same skills your degree expects you to demonstrate.

Blockchain and Decentralized Systems Engineering

Master · Software Engineering

Strong alignment

This challenge maps to Blockchain and Decentralized Systems Engineering at the Master level. It sharpens the same practical skills your coursework expects — but in a real industry context with actual constraints and deliverables.

One more thing

You can put a credential on your CV by Friday.