When Computers Design the Interface | Joonas Lehtinen (Chief Strategy Officer, Vaadin)

Listen to full episode:

Summary: This episode explores a major shift in how software interfaces may be built and used: not just humans talking to computers, but computers dynamically generating interfaces for humans. Anant, Ed, and guest Joonas Lehtinen (Chief Strategy Officer, Vaadin) discuss how model-driven user experiences, MCP apps, and generative UI could reshape enterprise workflows, approvals, interviews, and even how we think about application design.

Chapters:

00:00 — Opening banter & episode overview

01:43 — Gemini, TPUs, and the hardware stack question

05:21 — Optimization moving up/down the AI stack; MCP apps in chat

14:07 — Joonas Lehtinen intro & the computer-human interaction shift

16:06 — Why computers may need to ask humans for help/permission

22:00 — Generative UI: one-shot apps, LLM as the application

25:17 — Invoice approval demo & teaching models UI vocabulary

28:36 — Case studies: nurse practitioner, hiring interview scoring

31:47 — What generated interfaces mean for "UI," speed vs. quality tradeoffs

39:31 — Practical limits, Figma/MCP workflows, QA for dynamic UX

43:39 — Stabilizing generated experiences, multimodal help, chat-side control

48:08 — From humans building apps to models shaping them; coding as conversation

53:01 — Closing reflections, next episode teaser, thanks

Sound Bites:

"It changes what user interfaces could be quite a bit when you have this smart foundation model that can craft the user interfaces on the fly."

“It’s not me calling into ChatGPT and asking for help. It will be the other way around.”

"The LLM is the application."