Building a High-Performance Static Photo Gallery with Go, SvelteKit, and Claude Code

I Ditched iCloud Photo Sharing and Built My Own (with an AI partner)

Doug Donohoe developed DD Photos to solve iCloud’s 26-second load times on 300 Mbps fiber connections. The system utilizes a Go-based CLI tool and a statically generated SvelteKit frontend to achieve near-instantaneous photo delivery.

Why This Matters

Technical debt in trillion-dollar platforms like iCloud results in egregious latency, forcing engineers to return to static file delivery for performance. This project demonstrates that while AI-assisted development can accelerate specialized tool creation, it still requires senior-level oversight to manage context limitations and architectural integrity.

Key Insights

• Performance Benchmarks: iCloud shared albums were timed taking 26+ seconds to load on a 300 Mbps fiber connection.
• Static Architecture: DD Photos uses a Go CLI tool (photogen) to resize JPEGs to WebP and generate JSON index files, eliminating request-time dynamic processing.
• Privacy Engineering: Implements password-protected albums using in-browser decryption via the Web Crypto API, ensuring passwords never reach the server.
• AI Productivity: Claude Code acted as a force multiplier, allowing a developer to move from the first commit to a live URL for friends and family in two days.
• AI Limitations: Claude lacks cross-session memory and can produce up to 80% code duplication in complex logic without human-led refactoring.

Working Examples

Execution command for the Go-based CLI tool to process images and generate indexes.

go run cmd/photogen/photogen.go -resize -index -clean -doit

Setup and local deployment steps for the DD Photos repository.

git clone https://github.com/dougdonohoe/ddphotos
cd ddphotos
brew install go vips pkg-config
go mod download
make web-nvm-install && make web-npm-install
make sample-photogen
make sample-npm-run-dev

Practical Applications

• Static Site Deployment: Use rsync to Apache/EC2 or aws s3 sync to S3+CloudFront for hosting images as simple files without a database. Pitfall: Failing to strip EXIF metadata can lead to GPS location leaks.
• AI-Assisted Prototyping: Utilize Claude Code for rapid implementation of unfamiliar stacks like SvelteKit. Pitfall: AI often declares victory without writing failing tests first, requiring explicit developer prompting.

References:

• https://dev.to/dougdonohoe/i-ditched-icloud-photo-sharing-and-built-my-own-with-an-ai-partner-10he
• https://github.com/dougdonohoe/ddphotos