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Tech Interview Handbook
Open SourcePractice & Challenges · Documentation & Learning
Free, curated interview prep: algorithms study plans, behavioral questions and resume advice by ex-Facebook engineers.
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Practice & Challenges · Documentation & Learning
Free, curated interview prep: algorithms study plans, behavioral questions and resume advice by ex-Facebook engineers.
Queues & Streaming · Database
Durable workflow execution engine — write workflows as code and Temporal handles retries, state and failures.
Unit & Component · Testing
Throwaway Docker containers for reliable integration tests.
Unit & Component · Testing
Test UI the way users interact with it; simple, complete bindings.
Animation · Frontend
Motion design tool with a visual editor that attaches to JavaScript — keyframe anything on the web.
3D & WebGL · Frontend
The JavaScript 3D library — WebGL scenes, materials, lights and cameras with an enormous ecosystem.
Relational · Database
PostgreSQL extension and cloud for time-series and analytics.
Terminals & Shells · Development Environment
Terminal multiplexer for persistent sessions, panes and windows.
Web Servers & Proxies · DevOps
Cloud-native reverse proxy and ingress controller with auto discovery.
Data Viz & Charts · Frontend
React components and blocks built for dashboards — charts, KPI cards and grids on Tailwind.
Dependency Security · Security
All-in-one open-source vulnerability and misconfiguration scanner.
API Protocols · Backend
End-to-end typesafe APIs without schemas or code generation.
Secret Scanning · Security
Open-source tool to find, verify and monitor leaked credentials.
Build & Lint · Frontend
High-performance build system and cache for JavaScript monorepos.
Serverless & BaaS · Database
Distributed SQLite-based database for edge and local-first apps.
ORMs · Backend
Mature decorator-based ORM for TypeScript and JavaScript.
Programming Languages
Typed JavaScript at scale. Official docs, playground and handbook.
Search Engines · Database
Open-source, in-memory search engine focused on developer experience.
Documentation Generators · PDF & Documents
Modern, fast typesetting system — a fresh alternative to LaTeX.
Web Analytics · Monitoring & Observability
Simple, self-hostable web analytics you own (trending).
Feature Flags · DevOps
Open-source feature flag platform you can self-host — strategies, gradual rollouts and an activation dashboard.
Ecosystem · CSS Tools
Instant on-demand atomic CSS engine with full customization.
Compression & Optimization · Image & Media
Free, open-source AI image upscaler for desktop — batch-enlarge images locally with Real-ESRGAN models.
Uptime & Alerting · Monitoring & Observability
Fancy open-source self-hosted uptime monitoring with status pages.