Do you want to be an open source software developer? To send pull requests and solve issues or review code on GitHub? Are you looking to add some practical experience to your CV while writing code for the benefit of all? Then I can help you get started. And the best part about open source development is the community you become a part of.

This article describes how to choose the projects you contribute to, how to start contributing and how to become an active developer.

I’ve added links in this article to most technologies and keywords I mention. In your learning journey, if you ever encounter something you don’t understand you shouldn’t be afraid to use Google or StackOverflow to learn more about it.

How to Choose a Project

Once you’ve decided you are ready to contribute to an open source project, you should decide on which project to contribute to and what issue to fix. My most important point is to choose a project you are really passionate about.

Don’t worry if you are not familiar with the programming language or technologies involved in the project. You’re not expected to know all the frameworks and languages mentioned in a tag line. But try picking a project you find cool to start with. If you care about good looking websites developed with clean code, try contributing to React, a project which uses modern JavaScript and functional reactive programming. Or how about contributing to Servo, the new and upcoming browser engine behind Firefox, written in Rust.

That being said, you should balance your passion for an idea with the difficulty associated with contributing to the project. The maintainers should make it easy to contribute. If a certain project makes you feel unwelcome, then avoid it. For example, old-school open source projects which still use mailing lists and cgit instead of moving to something like GitLab or Phabricator, deserve the lack of new/young contributors they have. Times change, and while I understand the supporters of mailing lists, I prefer having an interface to send my pull requests instead of preparing and mailing patches. I did once send a contribution to a mailing list and the experience sucks. Gmail with 2FA isn’t very easy to configure as a Git mail client either.

Getting Your Feet Wet

Start by fetching the project’s source code. Nowadays almost everybody uses Git, but if they use something like Subversion or Mercurial it should be just as simple. It goes without saying that a project lacking any sort of version control is a big red flag. If the project is hosted on some platform like Bitbucket or GitHub, you should also fork the original repository and clone your fork locally. This implies getting a bit acquainted with the Git workflow, including things like commits, branches and merging. This is a whole subject in itself, but the Pro Git book or this first contributions guide will help get you on your feet. Sadly, there’s no getting around not using Git; familiarity with a version control system is a required skill, just like the ability to work in a team.

Then you should try building the code (if it’s written in a compiled language) and run all the tests. The project you’re working on has automated tests, doesn’t it? Most repos you’ll find have a (or similar) file which describes the steps you need to take, and you can always raise an issue with the maintainers if building doesn’t work (it’s their responsibility to keep the code compilable, and if anything goes wrong they’re probably more familiar with the build system than you are).

And the final step to actually contributing is to pick an issue and fix it. It’s better not to send random pull requests, but to fix an existing bug or implement a much-requested feature. As for how to actually solve the issue, read the issue’s description. But if you seem to be making no progress, try asking for clearer instructions on the issue page or asking on a project’s chat. You’ll always find someone more experienced who can help you when you’re stuck.

In parallel with all the above steps you should try becoming familiar with a project’s layout. Code is the single source of truth for a computer program, so you have no excuse not to understand it. Reading all of the source files of a big project would take ages and not help you much; focus on determining where are the files you need to modify to fix the issue, as well as where to add new tests.

After you’re done, write a nice commit description and send the pull request to the original project. You will probably undergo your first code review. Do not worry too much about negative comments or feel personally attacked; feedback is important and you should see this as an opportunity to improve the quality of your code.

Become a Part of the Community

Once your first PR gets accepted, you should already start thinking about your second contribution. Undoubtedly you have a busy schedule and work to do, but you’ll see that putting aside a few minutes every day or every few days can nevertheless make you pretty active.

To avoid burnout, try to diversify your contributions. Don’t get stuck in a single tech stack or one organization. Find what dependencies a project has and contribute to those. If you’ve only sent improvements to libraries, try finding an open source application to work on. You should also try writing documentation, helping new users by being active on a project’s Discord/Zulip channel and so on. The possibilities for making a positive change are endless.


I hope that the last few paragraphs gave you an idea of what being an OSS developer implies. It’s quite different from the software development process taking place in most companies, but seeing how your contributions fit into the larger picture to build a wonderful project is the best feeling in the world.

I’ll close by recalling Wikipedia’s advice for new editors: be bold. Just because it’s the first time you’re contributing to a certain project (or the first time in general), you shouldn’t be afraid to tackle more difficult issues such as adding new features or fixing crashes. Adding tests or improving the documentation is appreciated, but you have to gain the courage to take on more challenging tasks as well.