Teemu Piirainen

Notes from building
with AI in practice.

Production AI systems, agentic software development and what the work feels like while it changes.

Illustration of a developer at a 'Decide what's next' console over an intake-to-review pipeline, as hand-coding and manual review fade away.

Jul 7, 2026 · ai · learning

AI took my job. Twice in one year. I still have one.

What a year of coding with AI did to my work, my role, and me. AI took over the writing, then the checking, and I had to relearn my role three times.

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Commit-history chart of five months of Claude Code contributions, the agent's 711 commits dwarfing my 98.

Jun 30, 2026 · ai · claude · architecture

5 months. 100% Claude Code. Zero architectural drift.

Every line of code in a five-month web service project was written by Claude Code. Here is the system that kept the architecture from drifting.

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An AI-generated decision summary for a Stripe subscription build: 18 decisions grouped into Foundations, Product model and other areas for a human to review.

Jun 2, 2026 · ai · agents · claude

AI Has Made Me a Text Parser. And I'm Terrible at That.

Claude writes a ten-page spec in a minute. Reading it takes me two hours. The fix was not a faster model, it was giving the human a ViewModel instead of a database dump.

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The words FOMO, FOMAT and FOMUT stacked with downward arrows on a dark background.

May 11, 2026 · ai · agents · workflow

FOMO, FOMAT, FOMUT, and the Bottleneck That Turned Out to Be Me

A year ago the agents were the bottleneck in my AI workflow. Now they run for hours unattended, and the bottleneck is me. Here is how that shift happened, and why it is a better problem.

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A 'Quality Pipeline for AI-Written Code' flowchart from feature request through human requirements, agent implementation and an independent validator that must pass before commit.

Mar 16, 2026 · ai · testing · agents · security

How I Validate Quality When AI Agents Write My Code

The eight-gate quality pipeline of tests, validator agents, reviews and deploy verification that turns AI-generated code into evidence.

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Mar 1, 2026 · ai · agents

I'm not working with a tool anymore

Eija Moisala asked me one question for her Ask a friend series: what have you been experimenting with, and what did it teach you?

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Feb 7, 2026 · ai · agents · performance

Your AI Coding Agents Are Slow Because Your Tools Talk Too Much

A validator agent spent 6-9x longer understanding test results than the tests took to run. The fix was not a better prompt. It was giving the tools a quieter mouth.

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Teemu Piirainen outside the Nokia Oulu 'Home of Radio' building.

Nov 20, 2025 · training · teams

Four training sessions with the Nokia team in Oulu

Back in Oulu with the same Nokia team: four sessions across half a year, and the one question that shows whether training actually stuck.

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Teemu Piirainen presenting to a seated audience at Elisa, beside a slide reading 'Just whistle while you work' with the seven dwarfs.

Nov 3, 2025 · ai · training · adoption

Turning AI into real results: what Elisa got right

What Elisa and a team led by Eija Moisala got right about AI adoption: leadership, permission, and making learning part of everyday work, with results in weeks.

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Teemu Piirainen speaking at a lectern at Ilmarinen, beside a slide comparing manual and AI-assisted delivery times across task types, about 3x faster overall.

Oct 20, 2025 · ai · training · adoption

Bringing AI to everyday work: speaking at Ilmarinen

A recap of my talk at Ilmarinen on making AI a real teammate at work: moving past pilots, into everyday workflows, and a culture that keeps learning.

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Teemu Piirainen speaking about AI adoption at the North Karelia Chamber of Commerce Digiklinikka event, beside a slide reading 'An AI is only as good as the prompt and context you give it.'

Oct 7, 2025 · ai · training · adoption

AI training for employees: how to guide AI from pilot to practice

A recap of my Digiklinikka talk for the North Karelia Chamber of Commerce: why AI has to be guided, and how teams move it from small pilots to everyday practice.

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