Level 3 of 6 · Shared path

Mid-Level Java Backend Engineer

Own services: concurrency, performance, messaging, caching and production operations.

300–450 hoursstudy estimate
6 Phases72 Modules
452 Lessons(curriculum)
Capstone projectDistributed Order Processing Platform

What you'll learn

Designs and owns moderately complex services, troubleshoots production issues, reasons about performance and reliability, and makes informed technical trade-offs.

Advanced Java and JVM Internals
Advanced PostgreSQL and Data Access
Distributed Systems Foundations
Caching and Nonrelational Data
Production Engineering and Security
API Evolution and Professional Ownership

What you'll build

Distributed Order Processing Platform

Independently deployable services split along domain boundaries: order saga, transactional outbox, idempotent consumers, inventory reservation, Redis caching, tracing, DLQs, load tests, recovery runbooks.

Is this level for you?

Working junior engineers or Level 2 graduates.

Curriculum

Open a phase to see its modules.

Phase 01: Advanced Java and JVM Internals10 modules · 65 lessons

Phase 02: Advanced PostgreSQL and Data Access12 modules · 74 lessons

Phase 03: Distributed Systems Foundations17 modules · 107 lessons

Phase 04: Caching and Nonrelational Data10 modules · 59 lessons

Phase 05: Production Engineering and Security17 modules · 110 lessons

Phase 06: API Evolution and Professional Ownership6 modules · 37 lessons

Prerequisites

Recommended before this level: Level 2 · Junior Java Backend Engineer

Completion criteria

Diagnoses a simulated production incident, improves a measured performance bottleneck, and defends the architecture's trade-offs.

Ready to begin Level 3?

Lesson 1: From .class file to running code

Start Learning