Learn CS. Discover the World.

beginner

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AIのためのPython：ゼロからエージェントへ

AI/MLを目指す初心者向けの完全なPythonコース。プログラミング経験不要。

📖 6 lessons ⏱ 1h 🎯 None

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advanced

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Android Jetpack Compose Mastery

Beyond basics: custom layouts, animations, side effects, and Compose performance.

📖 3 lessons 🎯 None

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advanced

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Apache Airflow Deep Dive

Beyond the basics: dynamic DAGs, sensors, custom operators, and production Airflow deployments.

📖 3 lessons 🎯 None

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advanced

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Apache Cassandra — Wide-Column Store

Distributed wide-column NoSQL: Cassandra ring topology, partitioning, and tunable consistency.

📖 3 lessons 🎯 None

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advanced

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Apache Druid — Real-Time OLAP

Sub-second analytical queries on streaming + historical data with Apache Druid.

📖 3 lessons 🎯 None

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advanced

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Apache Flink — Real-Time Stream Processing

Stateful stream processing with Apache Flink: windows, watermarks, and exactly-once semantics.

📖 3 lessons 🎯 None

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advanced

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Apache Kafka — Event Streaming Platform

Build real-time, event-driven systems with Kafka topics, producers, consumers, and Kafka Streams.

📖 3 lessons 🎯 Backend development, Distributed systems basics

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advanced

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Apache Spark — Big Data Processing

Process massive datasets at scale with Spark SQL, DataFrames, and Spark Streaming.

📖 3 lessons 🎯 Python or Scala, SQL basics

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advanced

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API Gateway Patterns

API gateway design: Kong, Tyk, AWS API Gateway. Routing, auth, rate limiting, and BFF patterns.

📖 3 lessons 🎯 None

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advanced

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Application Security — SAST & DAST

Find vulnerabilities before attackers do: static analysis, dynamic scanning, and dependency auditing.

📖 3 lessons 🎯 None

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intermediate

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Astro — The Content-Focused Framework

Build blazing-fast content sites with Astro: islands architecture, partial hydration, and zero-JS by default.

📖 3 lessons 🎯 None

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advanced

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Authentication & OAuth 2.1

Production auth patterns: OAuth 2.1, OIDC, JWTs, refresh tokens, and session management without the gotchas.

📖 3 lessons 🎯 None

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intermediate

Free Course

AWSでクラウドコンピューティング

AWSの基礎：EC2、S3、Lambda、RDS、IAM。実際のアプリをクラウドにデプロイする。

📖 4 lessons 🎯 linux-bash, docker-containers

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intermediate

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Backend for Frontend (BFF)

Tailored backends per client: BFF pattern, GraphQL federation, and the API composition layer.

📖 3 lessons 🎯 None

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advanced

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Backstage — Developer Portals

Spotify Backstage: service catalogs, scaffolders, and internal developer portals.

📖 3 lessons 🎯 None

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intermediate

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Browser Extensions

Chrome MV3 extensions: content scripts, service workers, storage, and Web Store publishing.

📖 3 lessons 🎯 None

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advanced

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Browser Internals — V8 & Rendering

How browsers work: V8 JIT, the rendering pipeline, layout, paint, composite, and event loop.

📖 3 lessons 🎯 None

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intermediate

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CDN & Edge — Cloudflare Workers

Serverless at the edge: Cloudflare Workers, KV, D1, R2, and Durable Objects.

📖 3 lessons 🎯 None

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advanced

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Chaos Engineering

Break things on purpose: chaos engineering principles, Chaos Mesh, and resilience testing.

📖 3 lessons 🎯 None

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advanced

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ClickHouse — Analytics Database

OLAP at scale: ClickHouse column store, merge tree engines, and sub-second analytics queries.

📖 3 lessons 🎯 None

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advanced

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Clojure — Lisp on the JVM

Modern Lisp with immutable data structures, REPL-driven development, and the JVM ecosystem.

📖 3 lessons 🎯 None

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advanced

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Cloud Security — IAM Patterns

Least privilege, role assumption, identity federation, and IAM in AWS, GCP, and Azure.

📖 3 lessons 🎯 None

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advanced

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Compilers — How Programming Languages Work

Lexing, parsing, AST, semantic analysis, IR, optimization, and code generation. Build a small compiler.

📖 3 lessons 🎯 None

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advanced

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Computer Graphics & WebGL

Rasterization, shaders, lighting models, and 3D rendering with WebGL and Three.js.

📖 3 lessons 🎯 None

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💻 advanced

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Computer Vision — Object Detection

YOLOv8, DETR, Segment Anything, and modern object detection pipelines.

📖 3 lessons 🎯 None

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advanced

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Computer Vision with PyTorch

Deep learning for images: CNNs, object detection, segmentation, and modern vision models.

📖 3 lessons 🎯 Deep Learning fundamentals, Python

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advanced

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Container Security

Image scanning, runtime security, eBPF-based detection, and securing Kubernetes clusters.

📖 3 lessons 🎯 None

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advanced

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CRDTs — Conflict-Free Data Types

Collaborative apps without conflicts: state-based and op-based CRDTs.

📖 3 lessons 🎯 None

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advanced

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Cryptography in Practice

Symmetric, asymmetric, hashing, KDFs, and avoiding the common crypto mistakes.

📖 3 lessons 🎯 None

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advanced

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Data Mesh Architecture

Decentralized data ownership: data mesh principles, data products, and federated governance.

📖 3 lessons 🎯 None

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advanced

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Database Internals — Storage Engines

B-trees, LSM-trees, WAL, MVCC, and how databases actually store and retrieve data.

📖 3 lessons 🎯 None

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intermediate

Free Course

dbt — Data Build Tool

Transform data in your warehouse using dbt: models, tests, snapshots, and analytics engineering.

📖 3 lessons 🎯 None

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intermediate

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DevOpsとCI/CDパイプライン

GitHub Actions、CI/CDパイプライン、コードとしてのインフラでデプロイを自動化する。

📖 3 lessons 🎯 git-version-control, docker-containers

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💻 advanced

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Diffusion Models Deep Dive

How diffusion models work: forward/reverse process, U-Nets, and beyond Stable Diffusion.

📖 3 lessons 🎯 None

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intermediate

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Discrete Mathematics for CS

Sets, logic, combinatorics, graph theory, and proofs — the math behind every CS topic.

📖 3 lessons 🎯 None

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advanced

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Distributed Caching Patterns

Cache aside, write-through, write-behind, cache invalidation, and the consistent hashing ring.

📖 3 lessons 🎯 None

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advanced

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Distributed Consensus — Raft & Paxos

How distributed systems agree: Raft, Paxos, and the CAP theorem in practice.

📖 3 lessons 🎯 None

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intermediate

Free Course

DockerとContainerの基礎

Dockerでアプリケーションをコンテナ化する。どこでもビルド、配布、実行できるようにする。

📖 3 lessons ⏱ 3h 🎯 linux-bash

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advanced

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Domain-Driven Design (DDD)

Bounded contexts, aggregates, ubiquitous language, and strategic design with DDD.

📖 3 lessons 🎯 None

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advanced

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Elixir & Phoenix — Concurrent Web

Build massively concurrent apps with Elixir, the BEAM VM, and the Phoenix LiveView framework.

📖 3 lessons 🎯 None

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advanced

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Ethical Hacking & Penetration Testing

Learn offensive security: reconnaissance, exploitation, and defensive thinking with hands-on labs.

📖 3 lessons 🎯 Cybersecurity basics, Linux

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advanced

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Event Sourcing & CQRS

Store events instead of state: event sourcing, CQRS, and projections.

📖 3 lessons 🎯 None

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advanced

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Event-Driven Architecture

Event-driven patterns: pub/sub, event streaming, event-carried state transfer.

📖 3 lessons 🎯 None

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intermediate

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Flutter — Cross-Platform Mobile Apps

Build beautiful, native-feeling apps for iOS and Android with Flutter and Dart.

📖 3 lessons 🎯 Programming experience

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intermediate

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Game Development with Unity

Build 2D and 3D games with Unity, C#, and the modern Unity 6 toolchain.

📖 3 lessons 🎯 None

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advanced

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Game Networking — Multiplayer

Multiplayer architecture: client-server vs peer-to-peer, lag compensation, and rollback netcode.

📖 3 lessons 🎯 None

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advanced

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Game Physics & Math

Vectors, matrices, quaternions, collision detection, and the math foundation of game physics.

📖 3 lessons 🎯 None

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beginner

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Git & GitHub — 開発者のためのバージョン管理

バージョン管理にGit、コラボレーションにGitHubをマスターする。すべての開発者に必須。

📖 3 lessons ⏱ 2h 🎯 None

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advanced

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GitOps with Argo CD

Declarative continuous deployment: Argo CD, App-of-Apps pattern, and progressive rollouts.

📖 3 lessons 🎯 None

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intermediate

Free Course

Go: クラウドネイティブバックエンド開発

高速で並行性の高いクラウドネイティブサービスをGoで構築。goroutine、チャネル、REST API、Kubernetesデプロイをカバー。

📖 4 lessons ⏱ 1h 🎯 python-ai, apis-rest

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intermediate

Free Course

Godot — Open Source Game Engine

Godot 4: scenes, nodes, GDScript, and shipping games on multiple platforms for free.

📖 3 lessons 🎯 None

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intermediate

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Google Cloud Platform (GCP)

Compute Engine, Cloud Run, BigQuery, Pub/Sub, and the GCP ecosystem.

📖 3 lessons 🎯 None

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intermediate

Free Course

GraphQL — Modern API Design

Design and build flexible, type-safe APIs with GraphQL, Apollo, and modern tooling.

📖 3 lessons 🎯 REST API basics

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advanced

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gRPC & Protocol Buffers

Build high-performance RPC services with gRPC, Protocol Buffers, and streaming.

📖 3 lessons 🎯 None

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advanced

Free Course

Haskell — Functional Programming

Pure functional programming with Haskell: types, monads, lazy evaluation, and category theory basics.

📖 3 lessons 🎯 None

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intermediate

Free Course

Helm Charts — Kubernetes Packaging

Templating, charts, repositories, and managing Kubernetes apps with Helm 3.

📖 3 lessons 🎯 None

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advanced

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Hexagonal & Clean Architecture

Ports and adapters, clean architecture layers, and dependency inversion in practice.

📖 3 lessons 🎯 None

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intermediate

Free Course

Internationalization (i18n)

i18n architecture: ICU MessageFormat, plurals, RTL, locale-aware formatting, and translation pipelines.

📖 3 lessons 🎯 None

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advanced

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iOS Animations & SwiftUI Mastery

SwiftUI matched geometry, spring animations, transitions, and Lottie. Build delightful iOS UX.

📖 3 lessons 🎯 None

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beginner

Free Course

Java: 基礎からエンタープライズまで

Javaの基礎からオブジェクト指向設計、コレクション、Stream、Spring Bootまで。エンタープライズバックエンドの言語。

📖 5 lessons ⏱ 1h 🎯 None

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intermediate

Free Course

KotlinとAndroidアプリ開発

GoogleのKotlinでAndroidアプリを構築。Jetpack Compose、ViewModel、Roomデータベース、Playストア公開をカバー。

📖 4 lessons ⏱ 1h 🎯 java-fundamentals

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advanced

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Kubernetes — Container Orchestration at Scale

Master Kubernetes for deploying, scaling, and managing containerized applications in production.

📖 3 lessons 🎯 Docker & Containers

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intermediate

Free Course

LangChain — Build LLM Applications

Build production LLM apps with LangChain: chains, agents, tools, memory, and retrieval.

📖 3 lessons 🎯 Python, NLP & LLM basics

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beginner

Free Course

LinuxとBash — 開発者向けコマンドライン

Linuxコマンドラインとbashスクリプティングをマスターする。バックエンド、DevOps、AI作業に必須。

📖 3 lessons ⏱ 6h 🎯 None

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advanced

Free Course

LLM Fine-Tuning with LoRA & QLoRA

Fine-tune large language models efficiently with LoRA, QLoRA, and the HuggingFace ecosystem.

📖 3 lessons 🎯 None

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intermediate

Free Course

Logging at Scale — ELK & Loki

Structured logging, log aggregation with the ELK stack and Loki, and log-based debugging.

📖 3 lessons 🎯 None

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advanced

Free Course

Microservices — Patterns & Practices

Design, build, and operate distributed systems using microservices patterns and best practices.

📖 3 lessons 🎯 System Design basics

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intermediate

Free Course

Microsoft Azure for Developers

Azure App Service, Functions, Cosmos DB, and the Azure developer toolchain.

📖 3 lessons 🎯 None

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advanced

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MLOps — Machine Learning in Production

Take ML models from notebook to production: tracking, deployment, monitoring, and CI/CD.

📖 3 lessons 🎯 Machine Learning basics

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advanced

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Mobile App Architecture — Clean & Scalable

Architect production mobile apps with MVVM, Clean Architecture, modular design, and dependency injection.

📖 3 lessons 🎯 Mobile development experience

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advanced

Free Course

Mobile App Performance Tuning

Profile, measure, and optimize: startup time, frame drops, memory leaks, and battery use.

📖 3 lessons 🎯 None

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intermediate

Free Course

Mobile Push Notifications

FCM, APNs, deep linking, rich notifications, and notification analytics.

📖 3 lessons 🎯 None

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intermediate

Free Course

Mobile Testing — XCTest & Espresso

Unit, UI, snapshot, and integration tests on iOS (XCTest) and Android (Espresso, Compose).

📖 3 lessons 🎯 None

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intermediate

Free Course

MongoDB & NoSQL Databases

Document databases done right: schema design, queries, aggregations, and scaling with MongoDB.

📖 3 lessons 🎯 Database fundamentals

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advanced

Free Course

Multimodal Models — CLIP & BLIP

Models that bridge vision and language: CLIP, BLIP, and multimodal embeddings for search and generation.

📖 3 lessons 🎯 None

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intermediate

Free Course

Next.js — Full-Stack React Framework

Build modern, server-rendered React apps with App Router, Server Components, and Vercel deployment.

📖 3 lessons 🎯 React.js basics

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advanced

Free Course

NLPと大規模言語モデル

自然言語処理、トランスフォーマー、GPTやClaudeなどのLLMを使ったアプリケーション構築。

📖 3 lessons 🎯 machine-learning, deep-learning

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intermediate

Free Course

Node.js — Server-Side JavaScript

Build production servers, APIs, and tools with Node.js, Express, and modern async patterns.

📖 3 lessons 🎯 JavaScript fundamentals

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advanced

Free Course

OpenTelemetry & Distributed Tracing

Instrument microservices with OpenTelemetry: traces, metrics, logs, and the unified observability stack.

📖 3 lessons 🎯 None

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advanced

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Operating Systems Concepts

Processes, threads, scheduling, virtual memory, file systems, and how Linux really works.

📖 3 lessons 🎯 None

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advanced

Free Course

Platform Engineering

IDPs, golden paths, and the modern platform engineering team.

📖 3 lessons 🎯 None

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intermediate

Free Course

PostgreSQL — Advanced Queries & Performance

Master Postgres: indexing, query planning, JSONB, window functions, and tuning for scale.

📖 3 lessons 🎯 SQL basics

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intermediate

Free Course

Prometheus & Grafana

Metrics-based monitoring: Prometheus scraping, PromQL queries, and Grafana dashboards.

📖 3 lessons 🎯 None

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intermediate

Free Course

Pulumi — Infrastructure as Code

IaC in real languages (TypeScript, Python, Go) with Pulumi instead of HCL.

📖 3 lessons 🎯 None

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intermediate

Free Course

PWAs & Service Workers

Progressive Web Apps: service workers, offline-first, push notifications, and installable web.

📖 3 lessons 🎯 None

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intermediate

Free Course

Pythonで学ぶ機械学習

scikit-learn、pandas、numpyを使った実践的な機械学習。実際の予測モデルを構築する。

📖 4 lessons ⏱ 19h 🎯 python-ai

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intermediate

Free Course

RabbitMQ — Message Queues

Decouple services with RabbitMQ: queues, exchanges, routing, and consumer patterns.

📖 3 lessons 🎯 None

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intermediate

Free Course

React Native — Cross-Platform Mobile

Build native iOS and Android apps from one JavaScript codebase using React Native, Expo, and modern patterns.

📖 3 lessons 🎯 None

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intermediate

Free Course

React.js — モダンUI開発

ReactでモダンなWeb UIを構築する。コンポーネント、フック、状態管理、実プロジェクト。

📖 4 lessons ⏱ 15h 🎯 web-fundamentals, javascript-modern

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advanced

Free Course

Recommendation Systems

Collaborative filtering, matrix factorization, neural recommenders, and ranking with two-tower models.

📖 3 lessons 🎯 None

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intermediate

Free Course

Redis — Caching & In-Memory Data

Use Redis for caching, sessions, queues, leaderboards, and pub/sub at scale.

📖 3 lessons 🎯 Backend development basics

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advanced

Free Course

Reinforcement Learning

Agents that learn from rewards: Q-learning, policy gradients, and deep RL with PPO.

📖 3 lessons 🎯 None

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intermediate

Free Course

REST API — 設計と構築

Python FastAPIでREST APIを設計・構築する。認証、データベース、デプロイ。

📖 3 lessons ⏱ 23h 🎯 python-ai, sql-databases

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advanced

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Rust — Systems Programming Without Fear

Learn memory-safe systems programming with Rust: ownership, borrowing, and zero-cost abstractions.

📖 3 lessons 🎯 Programming experience in any language

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advanced

Free Course

Sagas & Distributed Transactions

Distributed transaction patterns: sagas, two-phase commit, and Outbox.

📖 3 lessons 🎯 None

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advanced

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Scala for Backend Development

Hybrid functional and OO programming on the JVM with Scala 3, Akka, and Play.

📖 3 lessons 🎯 None

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intermediate

Free Course

SEO Engineering for Developers

Technical SEO: crawlability, sitemaps, structured data, Core Web Vitals, and search Console.

📖 3 lessons 🎯 None

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advanced

Free Course

Serverless with AWS Lambda Advanced

Beyond hello world: cold starts, layers, container Lambdas, EventBridge, and SAM/CDK.

📖 3 lessons 🎯 None

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advanced

Free Course

Service Mesh — Istio & Linkerd

Traffic management, mTLS, observability, and the service mesh pattern with Istio and Linkerd.

📖 3 lessons 🎯 None

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advanced

Free Course

Site Reliability Engineering (SRE)

SLIs, SLOs, error budgets, on-call rotations, and the SRE mindset for production reliability.

📖 3 lessons 🎯 None

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intermediate

Free Course

Snowflake — Cloud Data Warehouse

Snowflake architecture, virtual warehouses, semi-structured data, and cost optimization.

📖 3 lessons 🎯 None

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intermediate

Free Course

Solid.js — Fine-Grained Reactivity

Reactive primitives without a virtual DOM: signals, effects, and the performance-first Solid.js framework.

📖 3 lessons 🎯 None

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advanced

Free Course

Solidity — Smart Contracts on Ethereum

Build, test, and deploy decentralized apps with Solidity, Hardhat, and the EVM ecosystem.

📖 3 lessons 🎯 Programming experience

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intermediate

Free Course

Speech Recognition with Whisper

OpenAI Whisper: speech-to-text, language detection, diarization, and production STT pipelines.

📖 3 lessons 🎯 None

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beginner

Free Course

SQLとデータベース — ゼロからクエリマスターへ

SQLをゼロから学ぶ — SELECTからJOIN、サブクエリまで。実際のデータベースを操作する。

📖 4 lessons ⏱ 15h 🎯 None

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intermediate

Free Course

Stable Diffusion — AI Image Generation

Generate, control, and customize AI images with Stable Diffusion, ControlNet, and LoRA.

📖 3 lessons 🎯 Python basics

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💻 advanced

Free Course

Strangler Fig — Legacy Migration

Incrementally replace legacy systems with the strangler fig pattern.

📖 3 lessons 🎯 None

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advanced

Free Course

Supply Chain Security

SBOM, sigstore, SLSA, and securing the software supply chain end-to-end.

📖 3 lessons 🎯 None

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intermediate

Free Course

Svelte & SvelteKit — Compiled UI

Write less code with Svelte 5: runes, reactivity, and SvelteKit for full-stack apps.

📖 3 lessons 🎯 None

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intermediate

Free Course

Swift & iOS Development

Build native iPhone apps with Swift, SwiftUI, and modern Apple frameworks.

📖 3 lessons 🎯 Programming experience

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intermediate

Free Course

Tailwind CSS v4 — Utility-First Styling

Master Tailwind CSS v4: the @theme directive, design tokens in CSS, and the new lightning-fast Rust engine.

📖 3 lessons 🎯 None

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advanced

Free Course

Terraform — Infrastructure as Code in Depth

Provision and manage cloud infrastructure declaratively with Terraform across AWS, GCP, and Azure.

📖 3 lessons 🎯 Cloud Computing basics

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intermediate

Free Course

Test-Driven Development with Jest

Build reliable software with TDD, unit/integration testing patterns, and Jest in JavaScript/TypeScript.

📖 3 lessons 🎯 JavaScript or TypeScript

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advanced

Free Course

Theory of Computation

Automata, regular languages, context-free grammars, Turing machines, and computational complexity.

📖 3 lessons 🎯 None

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intermediate

Free Course

Time-Series with InfluxDB

Time-series workloads: InfluxDB, Flux queries, downsampling, and IoT pipelines.

📖 3 lessons 🎯 None

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intermediate

Free Course

TypeScript — スーパーパワーを持つJavaScript

TypeScriptでJavaScriptに静的型付けを追加する。バグが減り、ツールが改善され、本番対応コードに。

📖 3 lessons ⏱ 5h 🎯 javascript-modern

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advanced

Free Course

Unreal Engine for Programmers

Unreal Engine 5: C++ programming, Blueprints, Nanite, Lumen, and shipping games.

📖 3 lessons 🎯 None

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advanced

Free Course

Vector Databases & RAG

Retrieval-Augmented Generation: embeddings, vector search, Pinecone/Weaviate, and production RAG.

📖 3 lessons 🎯 LLM basics, Python

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intermediate

Free Course

Vue.js — Progressive Frontend Framework

Master Vue 3, the Composition API, and the modern Vue ecosystem for reactive web UIs.

📖 3 lessons 🎯 JavaScript fundamentals, HTML/CSS

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intermediate

Free Course

Web Accessibility (WCAG 2.2)

Build for everyone: semantic HTML, ARIA, keyboard navigation, screen readers, and WCAG 2.2 AA compliance.

📖 3 lessons 🎯 None

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intermediate

Free Course

Web Animations — GSAP & CSS

GSAP for complex animations, scroll triggers, and physics. Plus modern CSS animation features.

📖 3 lessons 🎯 None

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intermediate

Free Course

Web Components & Lit

Framework-agnostic UI with native Web Components and the Lit library.

📖 3 lessons 🎯 None

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intermediate

Free Course

Web Performance — Core Web Vitals

Master LCP, INP, and CLS: profiling, image optimization, code splitting, and the rendering critical path.

📖 3 lessons 🎯 None

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advanced

Free Course

WebAssembly — High-Performance Web

Run native-speed code in the browser with WebAssembly, Rust, and modern WASM toolchains.

📖 3 lessons 🎯 JavaScript, Some C/C++ or Rust

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advanced

Free Course

WebGPU & 3D on the Web

WebGPU: the next-generation graphics API for the web. Compute shaders and modern 3D rendering.

📖 3 lessons 🎯 None

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intermediate

Free Course

WebSockets & Real-Time Backend

Build real-time backends with WebSockets, Socket.IO, scaling, and presence tracking.

📖 3 lessons 🎯 None

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beginner

Free Course

Web開発の基礎

HTMLとCSSとJavaScriptをゼロから学ぶ。コース終了時には実際のWebサイトを作れるようになる。

📖 4 lessons ⏱ 1h 🎯 None

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advanced

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Zig — Modern Systems Programming

Zig: a manual-memory systems language with compile-time evaluation and no hidden control flow.

📖 3 lessons 🎯 None

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advanced

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データエンジニアリングパイプライン

Python、Airflow、Sparkでデータパイプラインを構築する。ETL、データレイク、リアルタイムストリーミング。

📖 4 lessons 🎯 python-ai, sql-databases, docker-containers

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intermediate

Free Course

データ構造とアルゴリズム

コンピュータサイエンスの核心：配列、木、グラフ、ソート、検索。面接に必須。

📖 4 lessons ⏱ 6h 🎯 python-ai

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intermediate

Free Course

コンピュータネットワーク基礎

インターネットの仕組み：TCP/IP、DNS、HTTP、TLS、ネットワークプロトコル。バックエンドとセキュリティに必須。

📖 3 lessons 🎯 None

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intermediate

Free Course

サイバーセキュリティ基礎

セキュリティの核心：OWASP Top 10、暗号化、認証、ネットワークセキュリティ、倫理的ハッキング基礎。

📖 3 lessons 🎯 linux-bash, apis-rest

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advanced

Free Course

システム設計 — スケーラビリティとアーキテクチャ

スケーラブルなシステム設計：ロードバランサー、キャッシュ、データベース、マイクロサービス。上級職に必須。

📖 4 lessons 🎯 sql-databases, apis-rest, docker-containers

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advanced

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ディープラーニングとニューラルネットワーク

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