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Dive into a collection of past posts and rediscover timeless content.

AI Personalization

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Why AI Personalization Gets Your Cold Email Flagged as Spam (And How to Fix It)

Jun 22, 2026

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4 min read

Why AI Personalization Gets Your Cold Email Flagged as Spam (And How to Fix It)

The traits that make AI-written outreach sound impressive are the same ones spam filters were trained to catch.

Feature

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How to Write and QA Cold Email at Scale

Jun 21, 2026

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5 min read

How to Write and QA Cold Email at Scale

The system our team uses to keep quality from sliding as volume grows: human frameworks, AI drafting, an automated review gate, and a human approval at the end.

What an Agent Army Actually Costs When You Run It for Real

May 2, 2026

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5 min read

What an Agent Army Actually Costs When You Run It for Real

The agents found almost 2,000 potential bugs. Investigated 747. Identified 445 unique root causes. Fixed 70. $750 in API tokens.

Cristian Frunze
Cristian Frunze
The Bet: Owning the Entire Cold Email Stack

Mar 4, 2026

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6 min read

The Bet: Owning the Entire Cold Email Stack

We're an 8-person startup trying to build what most companies staff 50 engineers to maintain. Here's why we're doing it anyway.

Cristian Frunze
Cristian Frunze
What 6 Months of Weekly Advisor Calls Taught Me About Building a Company

Feb 19, 2026

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6 min read

What 6 Months of Weekly Advisor Calls Taught Me About Building a Company

I thought I was getting a strategy partner. I got something more useful: someone who kept asking me better questions.

Cristian Frunze
Cristian Frunze
AI Made Me Addicted to Productivity

Feb 19, 2026

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6 min read

AI Made Me Addicted to Productivity

Last week I looked up and realized I hadn't stopped working in 14 hours. Not because I had to. Because AI made it impossible to stop

Cristian Frunze
Cristian Frunze
GPT 5.3 vs Opus 4.6 vs Gemini 3 Pro vs Kimi K2.5 -  building a GTM system

Feb 10, 2026

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12 min read

GPT 5.3 vs Opus 4.6 vs Gemini 3 Pro vs Kimi K2.5 - building a GTM system

I gave the exact same project to GPT, Claude, Gemini, and Kimi. It went exactly as expected

Cristian Frunze
Cristian Frunze
Why I Stopped Trying to Build a SaaS

Feb 3, 2026

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4 min read

Why I Stopped Trying to Build a SaaS

I was 6 months into planning a pivot. Then I realized the game had changed.

Cristian Frunze
Cristian Frunze
I Left College and Traveled to 6 Countries in 30 Days. Here's What I Learned.

Jan 28, 2026

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4 min read

I Left College and Traveled to 6 Countries in 30 Days. Here's What I Learned.

California. Ukraine. Switzerland. Austria. Czechia. Moldova. I didn't plan any of it.

Cristian Frunze
Cristian Frunze
How I'm thinking about fundraising vs bootstrapping

Jan 23, 2026

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8 min read

How I'm thinking about fundraising vs bootstrapping

Cristian Frunze
Cristian Frunze
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The Ken Newsletter

Scaling breaks stuff daily. We document the fixes so you don’t have to figure it out alone.