Build a Reliable Transport Layer Over UDP

FreeVerified credential3 weeksIntermediate

Overview

What this challenge is about.

Implement a reliable UDP transport layer in Go with handshakes, retransmission, and flow control. Run 100MB transfers. Earn a verifiable certificate.

The scenario

The studio's gameplay traffic runs over a custom UDP protocol because TCP head-of-line blocking ruins mobile-network experience — engineers need to understand the building blocks before touching the production code.

CredentialBlockchain-anchored

ShareableLinkedIn-ready

LanguageEnglish

PaceSelf-paced

The Brief

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

Implement a reliable transport over UDP in Go with sequencing, retransmission, and flow control, validated against a lossy-network test harness.

Earning criteria — what you'll demonstrate

Implement sequencing, acknowledgement, and retransmission from scratch
Reason about sliding-window flow control and ACK timing
Measure goodput honestly under controlled loss and RTT
Communicate transport-protocol design trade-offs

Program Fit

Where this fits in your program.

Sharpens the same skills your degree expects you to demonstrate.

Computer Networks

Bachelor · Networking

Strong alignment

This challenge maps to Computer Networks at the Bachelor 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.

Careers

Career paths this challenge builds toward

Completing this challenge demonstrates skills that transfer directly to these roles:

Career paths this builds toward

Canonical roles

Backend Engineer
Behind every app a user touches, there's a quieter system doing the actual work — routing requests, holding state, refusing bad input politely. Backend engineers build and care for that hidden layer. The role is part craft, part diplomacy: you're designing APIs that other engineers will lean on for years, and a careless schema choice can echo through a company for a long time. Good work here looks like code that's boring in the best way — predictable under load, easy for the next person to read, observable when something breaks. Students grow into this role by getting comfortable with Python or another server language, then learning how databases really behave when traffic spikes.
Software Engineering

One more thing

You can put a credential on your CV by Friday.

Start this challenge