--- title: TDD & DDD from the Ground Up • Christopher Simon • GOTO 2025 description: A live-coded walkthrough of building a university registration system using TDD and DDD together. Starting with simple REST API tests in Java (Spring Boot),... canonical: https://daily.dev/posts/tdd-ddd-from-the-ground-up-christopher-simon-goto-2025-bveym14td twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: TDD & DDD from the Ground Up • Christopher Simon • GOTO 2025 | daily.dev og:description: A live-coded walkthrough of building a university registration system using TDD and DDD together. Starting with simple REST API tests in Java (Spring Boot),... og:url: https://daily.dev/posts/tdd-ddd-from-the-ground-up-christopher-simon-goto-2025-bveym14td og:image: https://api.daily.dev/og/posts/BvEYM14TD.png og:image:alt: TDD & DDD from the Ground Up • Christopher Simon • GOTO 2025 og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # TDD & DDD from the Ground Up • Christopher Simon • GOTO 2025 **[GOTO Conferences](https://daily.dev/sources/goto)** · 46 min read · 1 upvotes · 0 comments ## Summary A live-coded walkthrough of building a university registration system using TDD and DDD together. Starting with simple REST API tests in Java (Spring Boot), the talk demonstrates the red-green-refactor cycle with very small incremental steps. As complexity grows — adding students, courses, rooms, and enrollment capacity checks — DDD concepts like ubiquitous language, static factory methods, domain services, and vertical slice architecture are introduced gradually. A concurrency bug in the capacity check leads to an event storming session with stakeholders, revealing the original room-allocation model was wrong. The correct flow separates enrollment from scheduling, with a scheduling algorithm assigned rooms after enrollment demand is known. The talk also briefly showcases Contextive, an open-source tool for managing ubiquitous language glossaries in IDEs. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Quarkus Insights \#254: Domain-Driven Design and Hexagonal Architecture - Part 2](https://daily.dev/posts/quarkus-insights-254-domain-driven-design-and-hexagonal-architecture---part-2-l0ys2wwrx) · Quarkus · 1 upvotes · 0 comments --- Tags: [#java](https://daily.dev/tags/java), [#spring-boot](https://daily.dev/tags/spring-boot), [#tdd](https://daily.dev/tags/tdd), [#domain-driven-design](https://daily.dev/tags/domain-driven-design) [View this post on daily.dev](https://daily.dev/posts/tdd-ddd-from-the-ground-up-christopher-simon-goto-2025-bveym14td) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"TDD & DDD from the Ground Up • Christopher Simon • GOTO 2025","url":"https://daily.dev/posts/tdd-ddd-from-the-ground-up-christopher-simon-goto-2025-bveym14td","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/tdd-ddd-from-the-ground-up-christopher-simon-goto-2025-bveym14td"},"datePublished":"2026-04-17T12:21:06.926Z","dateModified":"2026-04-17T12:21:26.763Z","description":"A live-coded walkthrough of building a university registration system using TDD and DDD together. 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