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Software Engineering

Backend Engineer

If you like the kind of work a Backend Engineer does, every challenge here gives you a chance to do that work on a real industry brief.

Skills you'll need

Recommended Challenges

· Expert only Clear

CodeExpertNew
Implement Raft Consensus for a Self-Hosted Feature-Flag Service
Implement the core Raft algorithm (leader election, log replication, snapshotting) from the original Ongaro & Ousterhout paper. Use an embedded key-value store (BoltDB or sled) …
- Raft Consensus
- Go Programming
- Grpc
Distributed Systems
CodeExpertNew
Abstract-Interpretation-Based Configuration Validator for a SaaS Platform
Define an abstract domain capturing relations between configuration fields (e.g. 'if billing.plan = enterprise then features.audit_log = true'). Implement an abstract-interpreta…
- Abstract Interpretation
- Static Analysis
- Rust Programming
Program Analysis
CodeExpertNew
Design a Raft-Based Consensus Layer for a Multi-Region Database
Implement Raft in Go per the original Ongaro-Ousterhout paper: leader election, log replication with the safety property, snapshotting at 10K-entry granularity, and joint-consen…
- Distributed Consensus
- Raft
- Fault Tolerance
Parallel and Distributed Algorithms
CodeExpertNew
HyperLogLog Cardinality for Real-Time Ad-Auction Analytics
Implement HyperLogLog with precision parameter p in {12, 14, 16} (4KB, 16KB, 64KB sketches) and benchmark relative error on a replayed 3-hour production trace (around 13 billion…
- Hyperloglog
- Probabilistic Data Structures
- Streaming Systems
Randomized Algorithms
Practice your coursework on real scenarios.
Every challenge is shaped from real industry context — not generic exercises. The work mirrors what your degree prepares you for.
Why Ewance
CodeExpertNew
Design a Lock-Free Concurrent Skip List for a Time-Series Database
Implement Fraser's lock-free skip list in Rust with marked pointers for logical deletion. Validate under loom for all interleavings up to 4 threads (or use shuttle if loom can't…
- Lock Free
- Concurrent Data Structures
- Rust Programming
Parallel and Distributed Algorithms
CodeExpertNew
Build a Real-Time Cascade Detection Pipeline for a Trading Platform
Receive 6 months of anonymized trade events (timestamp, ticker, side, volume, account_segment) plus a static follower graph among 50k 'top trader' accounts. Build a streaming pi…
- Streaming
- Network Science
- Graph Analysis
Network Science and Computational Social Science

How it works

From brief to credential, in six steps.

Step 01
Browse challenges aligned to your studies.
Step 02
Accept the one that fits your goals.
Step 03
Work through it with AI Copilot guidance.
Step 04
Submit for structured evaluation.
Step 05
Earn a verified credential.
Step 06
Add it to LinkedIn with one click.

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Skills and disciplines shown on this page are derived from the Ewance challenge catalogue. When the median annual salary is available for this role via Adzuna, it will be shown above with the sample size and country.