codespy.orgBackend engineering & system design,
Backend engineering & system design,
without the fluff.
No recycled docs, no paraphrased Wikipedia. Every article is written by someone who has actually built the thing — with real diagrams, real trade-offs, and real code.
$ codespy latest --limit 3
Jul 26 — Build an MCP Client with Spring AI –…
Jul 26 — Build an MCP Server with Spring AI –…
Jul 26 — Build Your First RAG App with Spring AI…
3 articles found_
What we cover
Three areas. Covered properly.
System Design
9 articles
Architecture breakdowns of real systems — payment processing, distributed databases, rate limiters — explained end to end.
Browse articlesProjects
4 articles
Full build logs for real applications, from first commit to production, with the decisions and trade-offs included.
Browse articlesSpring AI
8 articles
Practical Spring Boot + AI engineering — LLM integration, RAG pipelines, and agents, for working Java developers.
Browse articles
How we work
The principles behind every article
1
Practitioner-first
Every article is written by someone who has actually built the thing. No recycled docs, no paraphrased Wikipedia.
2
Simple language, real examples
If a junior developer can't follow it, the article isn't ready. No jargon for its own sake.
3
Depth over shallow overviews
We don't do 300-word overviews. If a topic is worth covering, we cover it properly — diagrams, examples, code.
Fresh off the compiler
Latest articles
Spring AI
July 26, 2026
11 min read
Build an MCP Client with Spring AI – Step by Step Guide
Build an MCP Client with Spring AI: In the last post, we built an MCP Server with three Jira tools — get open tickets, create ticket, and update ticket status.…
Read the full breakdown
Who's behind this
Built by people who've shipped the thing they write about
“I started CodeSpy because I was tired of technical content that either oversimplified everything or assumed you already knew it all. This site is what I wish existed when I was learning.”
“Founded CodeSpy in 2022 to make backend engineering and system design genuinely accessible. Leads editorial strategy, writes on Spring AI and distributed systems, and reviews every article before it goes live.”
“Co-founded CodeSpy and drives its System Design content — breaking down complex architectural concepts, from payment processing systems to distributed databases, into articles that are rigorous, practical, and interview-ready.”
