What is a software engineering job simulator?
A software engineering job simulator lets you practice the day-to-day work of a developer job: picking up tickets, changing code someone else wrote, opening pull requests and getting them reviewed. This guide explains how it compares to other kinds of practice, what to look for in one, and where the limits are.
How it compares to other ways to practice
Each kind of practice trains something different. Coding puzzles, like the problems on LeetCode, train algorithms and the format of technical interviews. Tutorials teach a new tool step by step. Portfolio projects show you can build something from nothing.
None of those put you in an existing codebase with a ticket and a reviewer, which is most of what a junior developer does all day. A job simulator fills that gap. It works best alongside the others, since interviews still test puzzles and portfolios still matter.
What to look for in one
Whichever simulator you try, check for these:
- A real codebase you didn't write, with enough code that you have to navigate it.
- A real git workflow, ideally pull requests on GitHub, so you practice the tools a job uses.
- Objective grading, such as tests you can't see, so passing means the fix works.
- Review on your actual diff, with specific comments about your code.
- Something you can show afterwards, such as links to merged pull requests.
How Kadra works
Kadra runs on sprints. A standup opens each day, and you pick up a ticket with acceptance criteria. You can try the browser demo first, or work on GitHub, where Kadra creates a repo for you and you open real pull requests.
Your teammates are AI personas, and they remember your earlier work. A hidden test suite runs in a sandbox to grade each fix, and the AI reviewer only approves once those tests pass. Some sprints include an on-call day, where you diagnose a simulated incident from logs and recent deploys. A retro closes the sprint, and your time on tickets is tracked, with a certificate an employer can verify by link.
There are eight practice codebases: an e-commerce store in Next.js, a CMS and a realtime chat app in TypeScript, a data pipeline in Python, a payments API in FastAPI, a REST API in Go, a banking core in Java and Spring Boot, and a booking service in C# and ASP.NET Core.
The limits
A simulator is practice. The teammates are AI, so you won't learn office politics or how to negotiate a deadline with a real manager. The codebases are much smaller than a company's. And the bugs were planted, which means each one has a known answer.
What a simulator does well is repetition. You can work through several tickets in a week, and each one ends with a review of your code. That's hard to get anywhere else before your first job.
Questions people ask
Is a job simulator the same as an internship?
No. An internship is employment, with real colleagues and a real product. A simulator is practice you can do any time. It's useful preparation for an internship and good evidence while you look for one.
Do job simulators help with technical interviews?
They help with the parts of interviews that ask about real work, like "walk me through a bug you fixed" or take-home tasks in an existing codebase. For algorithm rounds, puzzle practice is still the direct preparation.
Which languages does Kadra support?
TypeScript with Next.js and Node, Python with FastAPI and a data pipeline, Go, Java with Spring Boot, and C# with ASP.NET Core. Each track needs that language's toolchain on your machine, or you can use the included Codespaces setup.
How much does Kadra cost?
Kadra is free during beta with no credit card. After beta, Pro is planned at $199 a year, and students get 50% off.
Try it on a real ticket
Pick a stack, fix a bug in a working codebase and get your pull request reviewed. Free during beta.