If you are a junior developer trying to land your first job, or a mid-level engineer looking to level up, you have probably received the exact same piece of advice: "Build a portfolio."
While building a personal To-Do app or a weather dashboard is a fine learning exercise, tech recruiters see thousands of them. What actually makes a resume stand out in 2026 is open-source contribution. Proving that you can jump into a real, complex codebase - communicate with other engineers, write meaningful commits, and ship production-ready code - is what separates candidates who get callbacks from those who don't.
At One Day Developers (OD2), we strongly believe in community-driven development. That's why we open-source several of our core libraries and developer tools, and actively invite contributors of all experience levels to participate.
Why Open Source Contribution Beats Personal Projects
Here's the honest comparison:
| Signal | Personal Project | Open Source Contribution |
|---|---|---|
| Proves you can write code | ✅ | ✅ |
| Proves you can read unfamiliar code | ❌ | ✅ |
| Proves you can communicate with engineers | ❌ | ✅ |
| Proves you understand code review | ❌ | ✅ |
| Proves your code ships to real users | ❌ | ✅ |
| Publicly verifiable on GitHub | ✅ | ✅ |
Recruiters can see your contribution history on GitHub. A green commit graph from a merged PR on a public library is a stronger signal than 20 private projects they can't evaluate.
Why Contribute to OD2?
Contributing to massive projects like React or Kubernetes can be intimidating - 10,000+ open issues, complex CI pipelines, weeks of setup, and PRs that take months to get reviewed. Small, fast-growing libraries are the perfect sweet spot for developers building their track record.
When you contribute to OD2:
1. Direct, Constructive Mentorship
Every Pull Request you submit is reviewed by the core OD2 team. We leave detailed, respectful feedback focused on architecture, code quality, and best practices - not just "looks good, merged." Our goal is to help you ship better code, not just to get issues closed.
2. Real-World Impact, Immediately
Our tools are actively used by real developers. The OTP Detector Library is installed via npm and powers email verification flows in live applications. When you fix a bug, real users stop hitting that bug the same day the fix is deployed.
3. Public, Permanent Credit
Your GitHub username is permanently linked to every commit and PR you land. We also feature contributors on our Contributors page - a public showcase of everyone who has helped build the OD2 ecosystem.
4. Beginner-Friendly Issues
We deliberately create and label good first issue tickets that are genuinely approachable - isolated bugs, documentation improvements, test coverage gaps, and small feature additions. You won't be dropped into an impossible task without context.
OD2 Open Source Projects
Here are the primary projects currently welcoming community contributions. View all at od2.in/contributions.
🔑 OTP Detector Library
A lightweight, context-aware JavaScript/TypeScript library that extracts OTPs and verification codes from any email text or HTML content. Published on npm as @onedaydevelopers/otp-detector.
What you'll work with: Regular expressions, JavaScript string parsing, npm package structure, Jest unit tests Good for: Developers interested in utility libraries, security patterns, and NLP-adjacent text processing Beginner entry points: Adding new OTP format patterns, improving test coverage, writing documentation
🖥️ Windows PID Manager
A desktop developer utility that instantly identifies and terminates Windows processes by port or name - solving the classic "Port 3000 is already in use" problem without command-line gymnastics.
What you'll work with: Electron, Node.js, Windows system APIs, process management Good for: Developers interested in desktop applications, OS-level APIs, and developer tooling Beginner entry points: UI improvements, error message clarity, keyboard shortcuts, documentation
🎮 Imposter Party Game
The browser-based social deduction party game. Handles real-time multiplayer via WebSockets, custom room management, and cross-device responsive design.
What you'll work with: Next.js, Socket.io or similar, game state logic, responsive CSS Good for: Front-end developers, game developers, or anyone interested in real-time web applications Beginner entry points: New word categories, UI polish, accessibility improvements
Step-by-Step: Your First Pull Request to OD2
Ready to write some code? Here is the exact workflow we expect from all OD2 contributors:
Step 1: Find the Right Issue
Navigate to the GitHub repository for the project you want to work on. Click the Issues tab. Filter by:
good first issue- curated for newcomers with clear scopehelp wanted- impactful improvements where we specifically need community helpdocumentation- lower code barrier, high value for the project
Can't find the right issue? Found a bug yourself, or have a feature idea? Open a new Issue first to discuss it with us before writing any code. This saves both parties time and avoids duplicate work.
Step 2: Fork and Clone
Never clone the main OD2 repository directly. Instead:
# 1. Fork on GitHub (click "Fork" top-right of the repo page)
# 2. Clone YOUR fork locally
git clone https://github.com/YOUR-USERNAME/repository-name.git
# 3. Add the original OD2 repo as a remote called "upstream"
git remote add upstream https://github.com/One-Day-Developers/repository-name.git
Read the README.md and CONTRIBUTING.md files before writing a single line of code. They contain setup instructions and conventions specific to each project.
Step 3: Create a Feature Branch
Never work directly on main. Create a descriptive branch name:
# For a bug fix
git checkout -b fix/otp-regex-phone-numbers
# For a new feature
git checkout -b feature/pid-manager-dark-mode
# For documentation
git checkout -b docs/improve-readme-setup-steps
Step 4: Write Your Code
Follow the existing code style in the repository. Key principles we enforce:
- Self-documenting code - variable and function names should explain themselves
- Small, focused commits - one logical change per commit
- Tests - if the repo has a test suite, your change should include tests
- No dead code - remove commented-out code before submitting
# Stage and commit your changes
git add .
git commit -m "fix: handle 6-digit OTPs with leading spaces in plain text emails"
We follow Conventional Commits format: type: description where type is fix, feat, docs, refactor, or test.
Step 5: Sync With Upstream Before Submitting
Before opening your PR, pull any changes that happened on main while you were working:
git fetch upstream
git rebase upstream/main
Resolve any merge conflicts, then push your branch:
git push origin fix/otp-regex-phone-numbers
Step 6: Open the Pull Request
On GitHub, click "Compare & pull request". Fill out the PR template completely:
- What did you change? Be specific.
- Why did you change it? Link to the Issue you're fixing.
- How did you test it? Describe the test scenarios.
- Screenshots (for UI changes): Before and after.
A complete PR description is the single biggest factor in getting reviewed quickly.
The Review Process
Once submitted, an OD2 maintainer will review your PR - typically within 2–5 business days. Expect at least one round of feedback. This is normal and not a rejection.
Common feedback categories:
- Architecture suggestions - a different approach that scales better
- Naming conventions - making code more self-explanatory
- Edge case handling - covering inputs we hadn't initially considered
- Test additions - covering scenarios your tests missed
Respond to feedback by updating your branch (new commits or amended commits) and leaving a comment on each thread once addressed. Do not close and reopen PRs - just update the existing one.
Once everything looks good, we'll merge your code, and your contribution is live.
What Contributors Have Gained
Here's what past OD2 contributors have reported:
- Their GitHub contribution graph went from sparse to active within 2–3 PRs
- Recruiters noticed and mentioned their open-source work in interviews
- They moved from "I've only done personal projects" to "I've shipped code used by real users"
- Code review feedback improved their code quality in their day jobs
Get Started Today
- Browse our active repositories at od2.in/contributions
- Find an issue labeled
good first issue - Fork the repo, set up locally, and write your solution
- Open your first PR
See the developers already building with us at od2.in/contributors - your avatar could be next.
Questions before you start? Reach out via our Contact page and we'll point you in the right direction.