Topics

Choose a domain to start learning.

Level

Java

Collections, concurrency, JVM, GC, Spring, generics.

9 lessons

L1L2L3

Elasticsearch

Mapping, query DSL, aggregations, cluster management.

6 lessons

L1L2L3

MongoDB

Data modeling, aggregation pipeline, replication, sharding.

7 lessons

L1L2L3

PostgreSQL

Query optimization, MVCC, transactions, partitioning.

7 lessons

L1L2L3

Software Architecture

DDD, CQRS, Event Sourcing, Clean Architecture, Sagas.

8 lessons

L1L2L3L4

Design Patterns

GoF 23 patterns, SOLID, architectural patterns, anti-patterns.

7 lessons

L1L2L3

OOP

Encapsulation, polymorphism, composition, generics.

6 lessons

L1L2

Cache

Redis, cache patterns, clustering, CDN, invalidation.

8 lessons

L1L2L3

Event-Driven

Kafka, RabbitMQ, Event Sourcing, Sagas, Outbox pattern.

8 lessons

L2L3L4

Security

Application & infrastructure security: OWASP Top 10, auth pitfalls, secrets management, real-world incidents.

8 lessons

L1L2L3

Algorithms

Big-O, data structures, divide & conquer, DP, graphs — sourced from CLRS and Cracking the Coding Interview.

12 lessons

L1L2L3

LLM Internals

How LLMs actually work: tokens, attention, training, decoding, RLHF — from Hands-On LLMs.

8 lessons

L1L2L3

AI Engineering

Build production-grade LLM applications: prompts, RAG, fine-tuning, evals, cost — from Chip Huyen's AI Engineering.

10 lessons

L1L2L3

Networking

TCP/IP, routing, DNS, TLS, HTTP, and CDNs — from Kurose and Ross.

8 lessons

L1L2L3