Open source. Open possibilities.

A collection of front-end developer interview questions covering HTML, CSS, JavaScript, accessibility, testing, performance, and networking.

Tech Interview Handbook provides free, curated technical interview preparation materials for software engineers, covering coding questions, behavioral questions, resume guides, and system design.

The System Design Primer is an open-source guide for learning scalable architecture and preparing for system design interviews, featuring organized resources, solved exercises, and Anki flashcards.

labuladong's algorithm notes: an open-source tutorial and problem-solving toolkit centered on LeetCode. With 60+ original Chinese articles, core pattern frameworks, a visualization panel, and multi-platform plugins, it helps learners master data structures and algorithms conceptually rather than just memorizing code.

Curated reading list on building scalable, reliable, high-performance large-scale systems, with design principles, case studies from tech giants, and interview resources.

A curated collection of 500 React interview questions and answers covering core concepts, hooks, Redux, routing, testing and more, aimed at helping developers prepare for React job interviews.

Front End Interview Handbook: an open-source collection of front-end interview preparation materials covering interview formats, system design, trivia, coding questions and company-specific questions, with translations into several languages.

A large open-source collection of 2624 DevOps and SRE interview questions and hands-on exercises spanning Linux, Kubernetes, Terraform, AWS, Azure, GCP, Docker, Ansible, CI/CD, networking, databases, observability, and more.

A curated collection of free resources for learning system design concepts and preparing for interviews, covering core concepts, networking, APIs, databases, caching, distributed systems, architectural patterns, tradeoffs, and interview problems.