Git Account Switcher

Native macOS menu bar app for atomic, transactional GitHub account switching — Keychain, git config, and gh CLI in one click.

Overview

A native macOS desktop app to switch between multiple GitHub accounts with a single click. It updates the macOS Keychain credentials, the global git config (user.name / user.email), and the GitHub CLI session — all in a single transaction with rollback on failure.

I shipped this twice: once with Electrobun + Bun + native macOS WebView for the smaller binary, and a parallel native version in Swift + SwiftUI (GitAccountSwitcher) to compare first-paint, memory, and DX.

Features

• Instant Account Switching with atomic, transactional updates
• Keychain Integration via git credential-osxkeychain
• Git Config Management of ~/.gitconfig
• GitHub CLI Support through gh auth switch
• System Tray menu for switching without opening the main window
• Credential Discovery auto-detects existing GitHub credentials from Keychain on first launch
• Encrypted Storage — account data stored in AES-256-GCM JSON files
• Rollback on Failure — any failed step rolls back to the previous state
• Launch at Login via a LaunchAgent plist
• Glass-effect UI with spring-physics animations

Technical Stack

Implementation Highlights

• Transactional switch: every switch composes Keychain writes + git config writes + gh auth switch into a single unit; any failure unwinds all prior writes
• Typed RPC between the Bun main process and the WebView, modeled after Electron's IPC but enforced through a shared rpc-types.ts schema
• Native WebView via Electrobun yielded an installer ~10× smaller than equivalent Electron builds, at the cost of a longer cold-start vs the Swift variant
• Side-by-side comparison with the SwiftUI build informed the tradeoff write-up: SwiftUI wins on first-paint and idle memory; Electrobun wins on cross-platform reuse

Role & Responsibilities

• Architected the transactional credential update with rollback semantics
• Wrote the Bun-side services (Keychain, git config, gh detection, notifications, LaunchAgent)
• Built the React UI, welcome wizard, and CLI setup wizard
• Shipped the parallel SwiftUI implementation for benchmarking