Developer Tools

How to build GitHub

Code hosting and collaboration platform with repos, pull requests, CI/CD, issues, and code review.

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Features (10)

Git repository hosting

Pull requests with code review

GitHub Actions CI/CD

Issue tracking with labels/milestones

Code search across repos

Branch protection rules

Webhooks and integrations

GitHub Pages hosting

Dependency security alerts

Copilot AI code suggestions

User Stories (5)

As a developer, I can push code and create pull requests

As a reviewer, I can comment on specific lines and approve changes

As a team, I can automate builds and deploys via Actions

As a maintainer, I can manage issues and project boards

As a developer, I can search code across all repositories

Suggested Tech Stack

Ruby on RailsGoMySQLRedisElasticsearchGitKubernetesReactGraphQL

Non-Functional Requirements

Category	Requirement	Target
Performance	Git operations	< 2s for push/pull on repos < 1GB
Performance	Code search	< 1s across 200M+ repositories
Scalability	Storage	200M+ repositories, petabytes of git data
Availability	Uptime SLA	99.95% — downtime blocks developer workflows globally
Security	Access control	Fine-grained permissions, 2FA, SSO (SAML), signed commits

Release Milestones

MVPGit Hosting

Repository CRUDGit push/pull/cloneBasic web UIUser accounts

v1.0Collaboration

Pull requestsCode reviewIssuesWebhooksBranch protection

v2.0DevOps Platform

GitHub Actions CI/CDPackages registryDependabotCopilot AICodespaces

Acceptance Criteria

Pull request shows diff, allows line-level comments, and blocks merge on failing checks

GitHub Actions workflow triggers on push/PR and reports status back to PR

Code search returns results from all accessible repos within 1 second

Branch protection enforces required reviews + status checks before merge

Success Metrics

Developer activation: > 80% push code in first week

PR merge time: < 24 hours median for active repos

Actions adoption: > 60% of active repos use CI

Monthly active developers: sustained growth > 5% QoQ

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