Overview
What this challenge is about.
Build an Indexer for an On-Chain DeFi Analytics Product. Advanced challenge in code. Writing production code that solves real engineering problems, earn a bl...
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.
This is not a coding exercise. It is the work a software engineer does between a Jira ticket and a merged PR. That distinction matters to every hiring manager who has seen candidates solve LeetCode problems and none who have shipped production code under real constraints.
When you finish, you will have something most graduates do not: a real-world deliverable, verified by Ewance, that you can show to a hiring manager and say "I did this. Here is the proof."
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.
Skills
Skills you'll demonstrate.
Each one shows up on your verified credential.
- Blockchain Indexing
Apply blockchain indexing to solve real industry problems and demonstrate production-level capability.
- Typescript
Write type-safe code that scales across large codebases and teams.
- Ethereum
Apply ethereum to solve real industry problems and demonstrate production-level capability.
- Postgresql
Apply postgresql to solve real industry problems and demonstrate production-level capability.
- Event Decoding
Apply event decoding to solve real industry problems and demonstrate production-level capability.
- Documentation
Apply documentation to solve real industry problems and demonstrate production-level capability.
Careers
Career paths this challenge builds toward
Completing this challenge demonstrates skills that transfer directly to these roles: