Why Open-Source Work Can Be a Strong Hiring Signal

A CV can explain what a developer says they can do.

Open-source work can sometimes show how they actually work.

Public repositories, pull requests, code reviews, issues and project discussions may provide employers with practical evidence of a candidate’s technical ability. They can also reveal how the person explains decisions, responds to feedback and works with others.

However, GitHub activity should not become a new requirement that unfairly excludes strong candidates. Not every developer has the time, permission or personal interest to contribute publicly.

The value of open-source work comes from the evidence it provides—not simply the number of contributions on a profile.

What Counts as Open-Source Work?

Open-source work is broader than publishing a complete software project.

A candidate may contribute by:

• Writing or improving code
• Fixing bugs
• Opening pull requests
• Reviewing another developer’s work
• Reporting or investigating issues
• Improving documentation
• Writing tests
• Updating dependencies
• Translating project materials
• Answering technical questions
• Helping maintain a project

GitHub explains that profile activity can include commits, pull requests, pull-request reviews, issues and discussions. However, not every contribution appears publicly or qualifies for the contribution graph.

Employers should therefore examine the quality and context of relevant work instead of judging candidates by the number of green squares on their profiles.

1. It Provides Evidence Beyond the CV

A CV is designed to summarise experience. It cannot show every technical decision a candidate has made.

Open-source work may allow a hiring team to inspect:

• How the candidate structures code
• Whether their changes are understandable
• How they approach testing
• How they document their work
• Whether they consider security and reliability
• How they break a problem into smaller tasks
• How they improve existing systems

This does not automatically prove that the candidate will succeed in a specific position. However, it gives interviewers real work to discuss.

Instead of asking only general questions, an interviewer can ask:

• What problem were you trying to solve?
• Why did you choose this approach?
• What alternatives did you consider?
• What feedback did you receive?
• What would you change if you completed the work again?

These questions can produce a more useful technical conversation than asking the candidate to repeat information already included in their CV.

2. Pull Requests Show More Than Finished Code

A finished repository shows the final result.

A pull request can show the process behind it.

GitHub describes pull requests as a central collaboration feature that allows people to propose, discuss and review changes before they are merged. Pull-request pages can include the description, commits, automated checks, comments and reviews connected to the change.

This context can help employers understand whether a candidate:

• Clearly explained the purpose of a change
• Kept the work focused
• Responded to questions
• Updated the code after receiving feedback
• Added tests or documentation
• Worked within the project’s standards
• Helped reviewers understand the decision

A small, well-explained contribution may provide a stronger hiring signal than a large project with little context.

3. Code Reviews Can Reveal Technical Judgement

Writing code is only one part of software development.

Engineers also need to read other people’s work, identify possible problems and explain improvements clearly.

GitHub notes that pull-request reviews help teams catch issues, share knowledge and decide whether a change is ready to merge. Reviewers can comment on specific lines, suggest edits, approve a change or request further work.

A candidate’s reviews may show whether they can:

• Identify risks without creating unnecessary conflict
• Explain technical concerns clearly
• Suggest practical improvements
• Consider maintainability and readability
• Separate important issues from personal preferences
• Give feedback respectfully

These skills can be especially valuable when hiring senior engineers, technical leads or people who will support less-experienced developers.

4. Issues Can Show Problem-Solving Ability

A useful contribution does not always begin with code.

Issue discussions may show how a candidate investigates a problem, asks questions and works towards a solution.

Employers can look for evidence that the person:

• Confirmed the problem before suggesting a fix
• Provided steps to reproduce an error
• Shared relevant logs or examples
• Considered different causes
• Communicated what they had already tested
• Connected the issue to a possible solution
• Helped keep the discussion focused

This can be useful when hiring for engineering, quality assurance, developer support, infrastructure or technical product roles.

The strongest signal is not how many issues the candidate has opened. It is whether their contribution helped the project understand or solve a real problem.

5. Documentation Work Shows Communication Skills

Documentation contributions are sometimes overlooked because they may involve less code.

However, clear documentation can show that a candidate understands both the technology and the people who need to use it.

A developer who improves installation instructions, explains an API or adds troubleshooting guidance may demonstrate:

• Technical understanding
• Attention to detail
• Clear written communication
• Empathy for users and other developers
• Awareness of common problems
• Ability to make complex information easier to follow

Open Source Guides also recognises documentation, translation and community support as valid ways to contribute to open-source projects.

For developer relations, technical writing, support engineering and product-focused roles, these contributions may be particularly relevant.

6. Contribution History Can Show Consistency

A contribution history may help employers understand how a candidate’s interests and responsibilities developed over time.

For example, a candidate may begin by fixing documentation, progress to small code changes and later review other contributors’ work.

That pattern can indicate learning, growing ownership and continued engagement.

However, consistency does not mean daily activity.

Employers should not assume that more commits equal more ability. A contribution graph does not show the difficulty, quality or business value of the work. It may also exclude work completed in private repositories or contributions that do not meet GitHub’s display criteria.

Review the work itself—not only the activity level.

7. Open-Source Work Can Improve Technical Interviews

Public work can help interviewers prepare more relevant questions.

Instead of giving every candidate the same abstract exercise, the interviewer can select one relevant contribution and ask the candidate to explain it.

A useful discussion may cover:

• The original problem
• The candidate’s individual contribution
• Technical constraints
• Decisions and trade-offs
• Testing and validation
• Feedback from maintainers
• The final result
• Lessons from the work

This gives the candidate an opportunity to discuss a real project they understand.

It also helps the interviewer verify whether the candidate can explain the work clearly and demonstrate genuine ownership.

What Employers Should Not Assume

Open-source work can be useful evidence, but it has clear limits.

No public profile does not mean no technical ability

Many experienced developers spend their working hours in private repositories. Employment agreements, confidentiality rules or client restrictions may prevent them from sharing their work.

Others may have family responsibilities, accessibility needs or limited personal time outside work.

Public contribution should not become an unpaid requirement for being considered.

A busy profile does not guarantee strong performance

A high number of commits may include small updates, automated changes or work with limited relevance to the vacancy.

Contribution volume does not automatically prove code quality, system-design ability or commercial experience.

Public code may not belong entirely to the candidate

A repository may include copied examples, generated code, group work or contributions from several people.

Interviewers should ask the candidate to explain their specific contribution rather than assuming ownership of the whole project.

Popularity is not the same as quality

Stars, followers and repository popularity can be influenced by timing, marketing, community size and project visibility.

A valuable contribution to a small project may be more relevant than owning a popular repository unrelated to the position.

How to Review Open-Source Work Fairly

Employers should use the same process for every candidate whose public work is being assessed.

Start with relevance

Choose work related to the responsibilities of the position.

A backend vacancy may require different evidence from a frontend, security, infrastructure or machine-learning position.

Review a small sample

Do not expect recruiters or interviewers to examine an entire GitHub history.

One or two relevant pull requests, reviews or projects may provide enough material for a useful discussion.

Understand the context

Read the project’s contribution guidelines, the original issue and the discussion surrounding the change.

A short contribution may have required significant investigation or coordination.

Ask the candidate

Give the candidate an opportunity to explain the work, their role and the decisions they made.

Do not make a final judgement based only on what is publicly visible.

Use consistent assessment criteria

Evaluate evidence connected to the position, such as:

• Technical understanding
• Problem-solving
• Code quality
• Testing
• Security awareness
• Documentation
• Communication
• Response to feedback
• Ownership

The criteria should be defined before the interview.

Combine it with other evidence

Open-source work should support the hiring decision—not replace the entire process.

Employers may still need structured interviews, technical discussions, reference checks or a reasonable skills assessment.

When Is Open-Source Work Most Useful?

Open-source evidence can be particularly helpful when:

• The candidate has limited formal experience
• The CV does not fully explain their technical ability
• The role involves open-source technologies
• Collaboration and code review are important
• The company is hiring maintainers or developer advocates
• The candidate is moving into a new technical specialism
• Employers need evidence beyond job titles

It may be less useful when most relevant work is private, the vacancy is not strongly connected to public software development or the candidate cannot legally share previous work.

Build the Hiring Decision Around Evidence

Open-source work can make technical ability more visible.

It may show how a candidate writes, communicates, investigates problems and contributes to a shared project. It can also give interviewers stronger questions and reduce reliance on self-reported skills.

But it should remain one signal among several.

The goal is not to find the candidate with the busiest GitHub profile. It is to find reliable evidence that the person can complete the work, collaborate effectively and grow within the role.

How Nindar Can Help

Nindar Consulting helps technology, AI and Web3 companies recruit specialist talent across global markets.

Through specialist recruitment, executive search, RPO and talent mapping, we help employers define technical requirements, identify relevant candidates and build evidence-based hiring processes.

Looking for technical talent with proven skills? Contact Nindar to discuss the experience and evidence your next hire should bring.

This article provides general hiring and business information only.