Engineering Lab

Learn by building real systems — then prove they work.

Backend-first paths through Java, Spring Boot, PostgreSQL, and DevOps, plus a working handbook for Claude Code and Codex. Every path ends in something verified, not something read.

Java
Spring Boot
PostgreSQL
DevOps
AX Engineering

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Client–Server and HTTP Request Lifecycle

Backend Engineering · Level 2 · 35 min

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Learning paths

Active

Backend Engineering

Recommended start

Ship secure, observable Spring Boot services end to end.

Java · Spring Boot · MyBatis · PostgreSQL

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Learning

DevOps for Backend

Take a service from local code to a reachable, recoverable deployment.

Docker · CI/CD · Nginx · Git

0/9 complete0%

Continue: Git

Experimenting

AX Engineering

Learn to design reliable human + AI development workflows using context, agents, tools, guardrails, verification, and evaluation.

Agent Harness · MCP · Evals · AI Workflow

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Built project

AX Engineering Harness

A reusable engineering layer for reliable AI-assisted software development. The AX Engineering path, built and running.

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Search across guides, labs, prompts, snippets, commands, and infrastructure references.

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Agent HandbookClaude Code · Codex · Config Full searchable libraryGuides · Labs · References

Hands-on practice

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DevOpsIntermediate

Dockerize a Spring Boot App

Package a Spring Boot service into a small, production-ready image using a multi-stage build.

45 min

DevOpsIntermediate

Docker Compose: Next.js + Spring Boot + PostgreSQL

Run the whole stack — frontend, API, and database — with a single command and no manually installed services.

1 hr

DevOpsIntermediate

Configure Nginx Reverse Proxy with HTTPS

Put Nginx in front of a Spring Boot app, terminate TLS with a free Let's Encrypt certificate, and force HTTPS.

1 hr

DevOpsIntermediate

Set Up a GitHub Actions CI/CD Pipeline

Run tests on every pull request, and build + push a Docker image automatically on every merge to main.

1 hr

Apply what you learn

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Backend APISource

H-Phsar — B2B Marketplace API

A B2B online marketplace API connecting distributors and retailers — stores, product catalogs, carts, an order state machine, and real-time notifications. Spring Boot 3 on PostgreSQL.

Spring Boot 3
Java 17
MyBatis

Concepts demonstrated

Authentication · Order workflow · Data modeling · Real-time notifications

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Full-Stack ApplicationLive

Hengo — Focused Korean Learning Platform

A focused AI-assisted Korean learning platform for software engineers and international professionals living and working in Korea.

Next.js 16
React 19
TypeScript

Concepts demonstrated

Workplace Korean · Spaced repetition · AI voice coaching · Daily practice UX

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Backend 0/14 · DevOps 0/9

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