HeyDevJob
LeetCode
Educative.io
interviewing.io
KodeKloud
SadServers.com
Killercoda
Instruqt
OnePatch
You work real engineering tickets in live cloud workspaces - debugging production incidents, building features, securing systems, and wiring up infrastructure - across DevOps, Backend, Security, Data, AI/ML, Kubernetes, and Fullstack. Not toy projects or algorithm puzzles. Real broken systems, a real terminal and editor, and a senior engineer (AI) in your corner when you get stuck. Every ticket you finish lands on a public portfolio that hiring managers can open and click - real work you can show, not a list of courses you watched or side-project repos that look like everyone else's. It's the kind of proof that actually moves the needle in interviews.
Most prep tools force a choice: rehearse synthetic skills to get past a screen, or do hands-on work nobody ties to a job. HeyDevJob is the intersection - production-grade work plus a record of what you've actually built.
Start free with junior tickets across every role, no credit card. Go Pro for mid and senior tickets and unlimited practice.
Stop prepping. Start proving - and get hired for the job you can already do.
OnePatch is multi-purpose software solution for e-commerce retailers who sell on multiple online selling platforms. With OnePatch, sellers have the solution to organise their product stock, manage their online orders, shipping and accounts all from one simple and effective system, saving valuable time and expanding business growth.
HeyDevJob
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LeetCode - Practice and level up your development skills and prepare for technical interviews.
Educative.io - Interactive courses for developers by developers
interviewing.io - Free, anonymous technical interview practice
KodeKloud - We are a fast growing EdTech startup on trending technologies in IT and Cloud Computing.
SadServers.com - Troubleshoot and make a sad server happy! "Like LeetCode for Linux" Capture The Flag challenges. Train and prove your debugging skills. Practice for your next SRE/DevOps interview. Get a full remote Linux server with a problem and fix it.
Killercoda - Interactive Learning Environments Kubernetes Linux DevOps. Run Katacoda scenarios on Killercoda!