Skill Guide

Version control, code review, and collaborative development with Git/GitHub

The systematic practice of tracking code changes, enforcing quality through peer review, and enabling parallel workstreams using Git and GitHub as the central platform for collaboration.

This skill is foundational for team velocity and codebase integrity, directly reducing deployment risks and time-to-market. It enables scalable engineering practices, which is a key indicator of a mature, high-performing organization.

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How to Learn Version control, code review, and collaborative development with Git/GitHub

Focus on mastering the core Git cycle: `clone`, `add`, `commit`, `push`, `pull`. Understand the difference between a local repository and a remote origin. Learn to create and switch between basic branches (`git checkout -b` or `git switch -c`).

Practice resolving merge conflicts in a team setting. Master interactive rebase (`git rebase -i`) for cleaning up commit history before merging. Learn to write meaningful commit messages and pull request descriptions that follow team conventions. Common mistake: force-pushing to shared branches.

Design and enforce branching strategies (e.g., Git Flow, trunk-based development) suited to the release cadence. Implement and manage protected branches, required review rules, and CI/CD triggers in GitHub. Mentor teams on atomic commits and bisecting (`git bisect`) for debugging.

Practice Projects

Beginner

Project

Solo Portfolio Project with Git

Scenario

You have a personal project (e.g., a simple web app). You want to track its development history and host it on GitHub.

How to Execute

1. Initialize a Git repo locally (`git init`). 2. Make logical commits with clear messages as you build features. 3. Create a repository on GitHub and push your local repo to it (`git remote add origin ; git push -u origin main`). 4. Use branches to experiment with new features without affecting `main`.

Intermediate

Case Study/Exercise

Code Review & Merge Conflict Resolution

Scenario

You are on a team of three developers. You've both modified the same function in a shared file. Your colleague has submitted a pull request, and the automated build shows a merge conflict.

How to Execute

1. Pull the latest `main` branch. 2. Create a new branch and attempt to merge your colleague's PR branch locally (`git merge `). 3. Resolve the conflict in the editor, choosing or combining the correct code. 4. Commit the merge resolution and push the updated PR. Perform a peer review on the final code, focusing on logic and style.

Advanced

Case Study/Exercise

Designing a Team Workflow & Hotfix Protocol

Scenario

As a tech lead, you need to establish a Git workflow for a team with a bi-weekly release cycle and a need for urgent production fixes. You must define branch protection, review policies, and a hotfix process.

How to Execute

1. Define a branching strategy (e.g., main, develop, feature, release, hotfix branches). 2. Configure GitHub branch protection rules on `main` and `release/*`: require PR reviews, status checks (CI), and linear history. 3. Document the hotfix process: branch from `main`, fix, PR review, merge to `main` and cherry-pick to `develop`. 4. Set up GitHub Actions to auto-deploy `main` to staging and `release/*` to production.

Tools & Frameworks

Software & Platforms

Git (CLI)GitHub / GitLab / BitbucketGitHub Desktop / Sourcetree / GitLens (VS Code)

Git CLI is the non-negotiable core. GitHub is the industry-standard platform for hosting, code review (PRs), CI/CD, and project management. GUI tools can lower the barrier for complex operations like rebase but CLI fluency is expected for senior roles.

Methodologies & Practices

Trunk-Based DevelopmentGit FlowConventional CommitsSemantic Versioning (SemVer)

Trunk-Based Dev emphasizes short-lived branches and frequent merges to `main` for continuous delivery. Git Flow provides a more structured, release-oriented model. Conventional Commits and SemVer automate changelog generation and version bumping via CI.

Interview Questions

Answer Strategy

Structure your answer around a systematic review: 1) Understand the 'why' from the PR description. 2) Check architectural fit and interface contracts. 3) Scrutinize logic, error handling, and tests. 4) Use inline, actionable comments. Sample: 'I start by reading the linked issue to grasp the goal. I then review the overall diff for architectural soundness before diving into logic. I comment directly on lines needing change, suggesting solutions, and always acknowledge good practices to maintain constructive tone.'

Answer Strategy

Tests incident response and knowledge of Git's limitations (history isn't easily erased). The core competency is security mindset and procedural rigor. Sample: 'Immediately, I would rotate the compromised secret. Then, using `git filter-repo` or BFG Repo-Cleaner, I would purge the secret from the entire repository history. Finally, I'd force-push the cleaned history after coordinating with the team, and implement a pre-commit hook to prevent future leaks.'