A psychologist's field notes on working in tech.
For designers who know what they should be doing but can't seem to start. A weekly newsletter on the patterns underneath — and 1:1 sessions and a small cohort for breaking them.
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Field notes on psychology & product strategy. No fluff. No Figma tutorials.
Every issue follows the same structure: a 3-minute video from the trenches, then a tactical essay you can use tomorrow at 9 AM.
Stakeholder Psychology
How PMs think, why engineers resist, and the behavioral science behind getting buy-in without formal authority.
Business-Fluent Design
Translating design decisions into the language of retention, risk, and revenue — the vocabulary that gets you heard in strategy meetings.
The Intentional Career
The psychological work of deciding who you want to become professionally — not just collecting frameworks, but building the identity to use them.
The Autopilot Problem
How attention gets hijacked, why decisions happen before you notice you're making them, and what it takes to actually catch the moment of choice.
Who writes this
I'm Stefan Vilar Markiewicz — a Product Design Manager in Porto with a master's in psychology and a postgraduate in UX research. I lead design inside a tech company. I'm not a coach who left tech to talk about it from a distance. I'm a practitioner still in the room — doing the inner work with structured data, including a personal ACT logging tool I built to track my own attention patterns over time. What I write here is what I'm actually noticing as I do the work.
Work with me
The newsletter is where the patterns get named. This is where they get broken — with real reps, on your real work.
FLAGSHIP · PRIVATE COHORT
The Upstream Shift
An eight-week rehearsal program that turns UI designers into product designers — on the work already on your plate. One rep per week, on your live projects. Currently running as a closed pilot.
1:1 · OPEN
The Clarity Session
Two focused sessions to name the pattern that's keeping you stuck — and build one concrete move that addresses the real problem, not the symptom. €150. No subscription. No upsell.
ASYNC + LIVE · OPEN
Portfolio Teardown
I review your strongest case study, then we rebuild the narrative together on a 45-minute call — from aesthetic showcase to business reasoning. You leave with a restructured document.







