Simon Martinelli (@simas_ch) header
Simon Martinelli (@simas_ch) profile picture

Simon Martinelli

@simas_ch

Creator of the AI Unified Process. Java Champion, Vaadin Champion, Oracle ACE Pro, Author, Speaker, Programming Architect, and Lecturer.

 Erlach, Schweiz
martinelli.ch
Joined April 2009
  • Tweets28.8K
  • Following1.7K
  • Followers10K
1.6KMedia
Photo by Simon Martinelli (@simas_ch)Photo by Simon Martinelli (@simas_ch)Photo by Simon Martinelli (@simas_ch)Photo by Simon Martinelli (@simas_ch)Photo by Simon Martinelli (@simas_ch)Photo by Simon Martinelli (@simas_ch)Photo by Simon Martinelli (@simas_ch)Photo by Simon Martinelli (@simas_ch)Photo by Simon Martinelli (@simas_ch)Photo by Simon Martinelli (@simas_ch)
Surprise! My book arrived two weeks before the official release date. 🎉 "Spec-Driven Development: From Specs to Code with AI Agents" (Apress Pocket Guides) is now available, both as softcover and eBook. It is a compact guide on how to make specs the contract between you and your AI agents, based on the AI Unified Process (AIUP). Requirements, use cases, entity models, and a complete case study, all in about 150 pages. I hope it helps you bring more structure into AI-assisted development. 👉 link.springer.com/book/10.10… #SpecDrivenDevelopment #AIUnifiedProcess #GenerativeAI #KeepITSimple
Spec-Driven Development

Spec-Driven Development

link.springer.com
8
32
2
234
14,299
Simon Martinelli retweeted
Claude (@claudeai) profile picture
Claude
@claudeai5h
We’re renaming our Max plans: Max 5x → Max Max 20x → Ultra Max is still $100/month, and Ultra is still $200. If you’re a subscriber, there’s nothing you need to do. We’re also removing the 5-hour limit for verified Ultra accounts, starting today with most existing subscribers. Newer accounts keep a temporary limit until they’re verified, which helps us prevent fraud and abuse. You'll get an email when it's removed. Weekly limits remain unchanged. View our plans here: claude.com/pricing
Image from Claude (@claudeai)
1,860
1,218
1,430
22,482
2,857,552
OpenSpec says what applies, but no file shows the path from searching an owner to canceling a visit. Rules can be checked one by one. Gaps between them stay invisible. Domain experts need the flow. martinelli.ch/openspec-and-t…
OpenSpec vs. AI Unified Process: Where Is the User Flow?

OpenSpec vs. AI Unified Process: Where Is the User Flow?

OpenSpec describes very precisely what a system must do. But nowhere does it show, in one piece, how a user moves through the application step by step. This is not a bug in the tool. It is a delibe...

martinelli.ch
2
5
363
OpenSpec and the Missing Flow from the User’s Perspective martinelli.ch/openspec-and-t…
OpenSpec vs. AI Unified Process: Where Is the User Flow?

OpenSpec vs. AI Unified Process: Where Is the User Flow?

OpenSpec describes very precisely what a system must do. But nowhere does it show, in one piece, how a user moves through the application step by step. This is not a bug in the tool. It is a delibe...

martinelli.ch
4
317
Simon Martinelli retweeted
Tessl (@tessl_io) profile picture
Tessl
@tessl_ioOct 29
Specs drift away from the code, and the docs go stale with them. @simas_ch's fix: tie the code to well-defined use cases, so spec and code can't quietly split. It sounds rigid. It simplifies. His AI Native DevCon London talk: youtube.com/watch?v=odbNXv9x…
1
1
3
275
Simon Martinelli retweeted
Josh Long (@starbuxman) profile picture
Josh Long
@starbuxmanOct 29
Hi, Spring fans! In this conversation, Josh Long explores how JOOQ turns SQL into a type-safe, fluent Java language—making complex database work safer, cleaner, and far more expressive. They cover everything from dynamic SQL transformation and cross-dialect support to low-level security, stored procedures, views, and the realities of working with modern databases like DuckDB, ClickHouse, Redshift, and more. Along the way, Lucas reflects on the origins of JOOQ, why he built it, and how the project has evolved from a clever Java DSL into a serious platform for enterprise-grade database development. The discussion also touches on AI-assisted debugging, the enduring relevance of SQL, and how strong typing can dramatically reduce mental overhead for developers and DBAs alike. If you care about databases, Java, or writing better software with less friction, this episode is a masterclass in thoughtful engineering and pragmatic elegance. podbean.com/ew/pb-xc6hq-1b98…
”Data Geekery” with JOOQ creator Lukas Eder

”Data Geekery” with JOOQ creator Lukas Eder

Hi, Spring fans! In this conversation, Josh Long explores how JOOQ turns SQL into a type-safe, fluent Java language—making complex database work safer, cleaner, and far more expressive. They cover...

ms.podbean.com
1
6
25
3,435
Simon Martinelli retweeted
Vaadin (@vaadin) profile picture
Vaadin@vaadinOct 29
Same model, same prompt, different results. On VaadinBench, Claude Opus 5 went from 67% to 100% with Vaadin's skills and MCP server. The Dev Loop (preview) made the same task 27% faster and 18% cheaper. Drew Harvey walks through the free tools: youtube.com/watch?v=-4p5BiGd…
Video thumbnail: "Same model, better results. Cost, speed, accuracy" with Drew Harvey, Software Engineer, next to a VaadinBench terminal report comparing plain agents with agents using Vaadin skills and MCP.

ALT Video thumbnail: "Same model, better results. Cost, speed, accuracy" with Drew Harvey, Software Engineer, next to a VaadinBench terminal report comparing plain agents with agents using Vaadin skills and MCP.

2
5
11
466
From Prompt Template to Skill: The IREB AI4RE Prompt Guide martinelli.ch/from-prompt-te…
IREB AI4RE Prompt Guide: From Template to Skill - Martinelli

IREB AI4RE Prompt Guide: From Template to Skill - Martinelli

“Write user stories for an ordering portal.” Most requirements prompts look like this. The answer looks plausible, reads well, and nobody can say whether it is good. The next person asks the same...

martinelli.ch
1
4
386
Simon Martinelli retweeted
Apress (@Apress) profile picture
Apress@ApressOct 28
What if your specs became the foundation for code, tests, and validation? Learn from @simas_ch how a spec-first approach reduces guesswork, improves alignment, and helps teams build software more efficiently. #SoftwareDevelopment #DevOps #Engineering 🔗 ow.ly/evz250ZW0HX
Image from Apress (@Apress)
1
2
230
I had a blast at the Vaadin Create speaker about Spec-driven Development. Thanks to everyone who came to my talk. You can find the slides here: speakerdeck.com/simas/spec-d…
Spec-Driven Development - Why Vaadin Is the Perfect Fit

Spec-Driven Development - Why Vaadin Is the Perfect Fit

AI makes coding faster, but speed does not solve the real problem: specifications and implementation drifting apart. This session shows a practical spe…

speakerdeck.com
Vaadin (@vaadin) profile pictureVaadin@vaadinOct 28
Vaadin Create 2026 is underway in Barcelona: AI-assisted development, modernization, architecture and full-stack UI for Java teams. Agenda and speakers: vaadin.com/vaadin-create-202…
Opening of Vaadin Create 2026: a speaker on stage between two screens reading "¡Hola, Barcelona!" in front of a full room of attendees.

ALT Opening of Vaadin Create 2026: a speaker on stage between two screens reading "¡Hola, Barcelona!" in front of a full room of attendees.

A spec-driven development talk at Vaadin Create 2026: the speaker at the podium next to an IDE showing business rules for a Petclinic veterinarians view.

ALT A spec-driven development talk at Vaadin Create 2026: the speaker at the podium next to an IDE showing business rules for a Petclinic veterinarians view.

AKDB talk at Vaadin Create 2026: a slide titled "Several interfaces, one governed source" listing a documentation website, Mate MCP, VS Code and a chatbot.

ALT AKDB talk at Vaadin Create 2026: a slide titled "Several interfaces, one governed source" listing a documentation website, Mate MCP, VS Code and a chatbot.

Testing talk at Vaadin Create 2026: the speaker at the podium between slides about locators, new in 2026 and inspired by Playwright.

ALT Testing talk at Vaadin Create 2026: the speaker at the podium between slides about locators, new in 2026 and inspired by Playwright.

2
10
457
Simon Martinelli retweeted
Vaadin (@vaadin) profile picture
Vaadin@vaadinOct 28
Vaadin Create 2026 is underway in Barcelona: AI-assisted development, modernization, architecture and full-stack UI for Java teams. Agenda and speakers: vaadin.com/vaadin-create-202…
Opening of Vaadin Create 2026: a speaker on stage between two screens reading "¡Hola, Barcelona!" in front of a full room of attendees.

ALT Opening of Vaadin Create 2026: a speaker on stage between two screens reading "¡Hola, Barcelona!" in front of a full room of attendees.

A spec-driven development talk at Vaadin Create 2026: the speaker at the podium next to an IDE showing business rules for a Petclinic veterinarians view.

ALT A spec-driven development talk at Vaadin Create 2026: the speaker at the podium next to an IDE showing business rules for a Petclinic veterinarians view.

AKDB talk at Vaadin Create 2026: a slide titled "Several interfaces, one governed source" listing a documentation website, Mate MCP, VS Code and a chatbot.

ALT AKDB talk at Vaadin Create 2026: a slide titled "Several interfaces, one governed source" listing a documentation website, Mate MCP, VS Code and a chatbot.

Testing talk at Vaadin Create 2026: the speaker at the podium between slides about locators, new in 2026 and inspired by Playwright.

ALT Testing talk at Vaadin Create 2026: the speaker at the podium between slides about locators, new in 2026 and inspired by Playwright.

2
2
1
11
888
Simon Martinelli retweeted
Venkat Subramaniam (@venkat_s) profile picture
Venkat Subramaniam@venkat_sOct 27
CFP for @arcofai is open! Main website: arcofai.com CFP link: arcofai.com/cfp
🤖 Made with AI
Image from Venkat Subramaniam (@venkat_s)
1
9
2
10
2,858
Thanks a lot to everyone who came to my talk "Spec-Driven Development - Why Vaadin Is the Perfect Fit" at @vaadin Create today! You can find the slides here: speakerdeck.com/simas/spec-d…
Spec-Driven Development - Why Vaadin Is the Perfect Fit

Spec-Driven Development - Why Vaadin Is the Perfect Fit

AI makes coding faster, but speed does not solve the real problem: specifications and implementation drifting apart. This session shows a practical spe…

speakerdeck.com
2
13
739
An agent that writes the code and the tests marks its own homework. Both come from the same reading of the requirement. Independence is not about test level. It is about where expectations come from and who can change them. martinelli.ch/who-owns-the-t…
Who Owns the Test Oracle? Agent-Written Tests - Martinelli

Who Owns the Test Oracle? Agent-Written Tests - Martinelli

More than 12,000 unit tests, all green. And still the bugs show up at the release boundary. This is what Paul Stack reports from Swamp, where agents write every line of code. In two recent posts,...

martinelli.ch
1
4
490
Who Owns the Test Oracle? martinelli.ch/who-owns-the-t…
Who Owns the Test Oracle? Agent-Written Tests - Martinelli

Who Owns the Test Oracle? Agent-Written Tests - Martinelli

More than 12,000 unit tests, all green. And still the bugs show up at the release boundary. This is what Paul Stack reports from Swamp, where agents write every line of code. In two recent posts,...

martinelli.ch
4
491
Simon Martinelli retweeted
Apress (@Apress) profile picture
Apress@ApressOct 26
Says @simas_ch: “Write the use case before you prompt: write the actors, the main scenario, the alternative flows & the business rules in a simple Markdown file. Give that file to your AI agent and let it implement the feature and the tests from it." 🔗 ow.ly/4rR550ZR08w
Image from Apress (@Apress)
2
1
6
330
Wheels down BCN for @vaadin create!
1
1
8
842
Simon Martinelli retweeted
Vaadin (@vaadin) profile picture
Vaadin@vaadinOct 26
Two new Vaadin add-ons for mobile: AppNavLayout: drawer on desktop, side rail on tablet, bottom bar on phone. AppHeadroom: header and footer hide as you scroll. Apache 2, Vaadin 25.1+. vaadin.com/blog/does-vaadin-…
Blog cover: Does Vaadin support mobile? Two new add-ons close the last gap

ALT Blog cover: Does Vaadin support mobile? Two new add-ons close the last gap

4
7
554
Simon Martinelli retweeted
Apress (@Apress) profile picture
Apress@ApressOct 24
What if your specs became the foundation for code, tests, and validation? Learn from @simas_ch how a spec-first approach reduces guesswork, improves alignment, and helps teams build software more efficiently. #SoftwareDevelopment #DevOps #Engineering 🔗 ow.ly/evz250ZW0HX
Image from Apress (@Apress)
1
2
310
🚀 AI Unified Process Marketplace 3.0 is here! The marketplace has a new architecture: one plugin per technical layer instead of one plugin for an entire technology stack. Why? Because every project is different, and your development workflow should reflect that. With Marketplace 3.0, you can: 🔹 Combine plugins for your specific technology stack 🔹 Reuse the core for implementation, testing and coverage analysis 🔹 Add new technologies without building an entire stack plugin 🔹 Keep things modular and use only what your project needs The marketplace now separates the process from the technology stack. The AI Unified Process stays the same, while the plugins provide the technology-specific capabilities. Less duplication. More flexibility. Easier to extend. As always, I build this to solve real problems in real projects. Eat your own dog food! 👉 Explore the new architecture: unifiedprocess.ai/layer-plug… #AIUnifiedProcess #SpecDrivenDevelopment #ClaudeCode #SoftwareArchitecture #AI
🤖 Made with AI
Image from Simon Martinelli (@simas_ch)
4
5
20
771
Simon Martinelli retweeted
Wim Deblauwe (@wimdeblauwe) profile picture
Wim Deblauwe@wimdeblauweOct 23
If you really think that frameworks and libraries don't matter "because we don't look at the code anymore", then take a plain Java JDK and have your agent write a web application not using any framework or library. Probably not very token efficient...
2
1
25
1,425
Load more