Foundation vs. Instruct vs. Thinking Models

A Senior Engineer’s Mental Model for AI

Dec 24, 2025 • Alex Ewerlöf

Emergent properties

What are nominal, weak and strong emergent properties and how to identify and mitigate their negative impact in system design?

Dec 5, 2025 • Alex Ewerlöf

12

1

4

November 2025

3 levels of writing

A leveling model to use writing for thinking, communication, and innovation

Nov 21, 2025 • Alex Ewerlöf

28

4

Fitting parts

What does it mean? How is it abused? And how to work around the pitfalls?

Nov 12, 2025 • Alex Ewerlöf

5

2

October 2025

AI topology

Cloud AI, Edge AI, Local AI, and Hybrid AI

Oct 24, 2025 • Alex Ewerlöf

Introducing: Local Browser AI

Using the new Prompt API for local chat in the browser

Oct 13, 2025 • Alex Ewerlöf

15

3

August 2025

SLI Evolution Stages

How to dodge vanity metrics and measure the right service level indicator and why?

Aug 27, 2025 • Alex Ewerlöf

20

4

SLI Compass: Fidelity and Granularity

A Mental Model to Assess Existing SLIs and Evaluate New Ones. We discuss 2 dimension: fidelity shows how closely your SLI is measuring the user…

Aug 8, 2025 • Alex Ewerlöf

10

3

2

Service Level Topology

Visualizing the service consumption and measurement topology while avoiding the most common SLI/SLO pitfalls

Aug 3, 2025 • Alex Ewerlöf

2

June 2025

SLA vs SLO

Demystifying the most common misconception in Service Level jargon

Jun 21, 2025 • Alex Ewerlöf

22

4

1

Wardley Maps & Pace Layering for Senior Tech Leads and Engineering Leaders

Intro to both tools, why they exist, how they overlap and pragmatic tips how to use them and when

Jun 6, 2025 • Alex Ewerlöf

31

4

4

May 2025

Ephemeral taskforce

The pragmatic alternative to technical committees

May 31, 2025 • Alex Ewerlöf

13

1