CTO Insights - Piotr Krzyzek

That "Cool" Mobile Design Is Quietly Killing Your Conversion Rate

public – 9 min read

A carousel-versus-stack decision on a real product page, plus a five-item mobile audit you can run on your own site in fifteen minutes. Boring but obvious beats polished but hidden.

Jun 17, 2026

Peter Krzyzek

What Stripe, GitHub, and Twilio Teach Non-Technical Leaders About API Design

public – 9 min read

A customer got charged twice during a renewal meeting. The cause was not a bug, it was the API. What Stripe, GitHub, and Twilio teach leaders who will never write a line of code, plus a one-page audit you can run this week.

Jun 5, 2026

Peter Krzyzek

How We Turned a 76-Page App Spec Into Something One Developer Can Ship

public – 9 min read

A 76-page MVP spec landed on one developer's desk. Three boring decisions turned it into something shippable: three named batches, an explicit Phase 3 list in writing, and developer annotations as part of the file.

May 29, 2026

Peter Krzyzek

Agentic AI Vendors Are the New Dev Shops: A Founder's Playbook for Evaluating Technical Partners

public – 11 min read

The pitch is new. The failure pattern is a decade old. Three conversations to have before signing any AI agent vendor: references that look like you, architecture not demo, and who carries the pager at 2am. Same due diligence as a dev agency. New buzzword.

May 28, 2026

Peter Krzyzek

Your Marketing Budget Has a Leak (And It's Not Where You Think)

public – 12 min read

Your marketing team is optimizing campaigns while your website quietly bleeds conversions. Here's the infrastructure checklist that could save your next quarter.

Mar 4, 2026

Peter Krzyzek

Someone Just Weaponized Google Docs to Spam Me: The Cold Outreach Tactic That Bypasses Every Spam Filter

public – 12 min read

A cold sales pitch disguised as a Google Docs notification. How the tactic works, a five-year timeline of Google's failed fixes, and a complete protection guide for founders and business owners.

Feb 11, 2026

Peter Krzyzek