Writing

Writing

Long-form essays with more room to think.

Life, Meaning, and AI After Coming Back from Hell

Not long ago, my mother was in a car accident. She spent about ten days in the ICU, and fortunately made it through the worst of it. Hospitals severely limit visitation, so most of the time I was either sitting in a hallway chair or waiting at a nearby cafe. I could not focus on anything during the day, and I could not sleep at night. It felt like living through hell.

Mar 22, 2026Read more

Substack•AI · Startup•English

A Mental Model for Building All-Purpose SaaS for Early-Stage Startups

The core loop behind a surprising amount of back-office SaaS is simple: input, processing, approval, and storage. Once AI agents can run that loop on top of your existing repo and workflows, the question shifts from which SaaS to buy to how you want to trigger, review, and accumulate the knowledge.

Feb 2, 2026Read more

Substack•Startup•English

The Era of the Solo Unicorn Has Arrived

2025 was the first year AI coding agents truly broke the development bottleneck. Once building became the cheapest commodity, the leverage for startups shifted: ideas mattered more, questions turned into answers faster, and a single founder could suddenly operate with far more force.

Jan 19, 2026Read more

Substack•Data & Decision-Making · Health•English

A better life through the data provided by my body

When you work in the startup scene, you hear the term ‘data-based decision-making’ like you breathe it. Look at indicators, formulate hypotheses, experiment, and learn from the results. This process, which I take for granted when creating a product, suddenly occurred to me that I wanted to apply it to myself.

Dec 14, 2025Read more

Substack•AI•English

Where are knowledge workers going?

Last July (2024), Bloomberg obtained data from OpenAI's internal meeting and reported on their AGI roadmap. It was a five-stage roadmap of chatbot → reasoning → agent → innovation → organization, and since I vaguely know how top tech companies turn their roadmaps into reality, I thought I should bet on this roadmap.

Nov 30, 2025Read more

Substack•Data & Decision-Making•English

Why are we the only ones who fail even though we follow the same example?

If you are in the startup scene, you will often hear sentences like “Do things that don’t scale,” “Psychological safety is the key to performance,” “You just need to introduce OKR,” and “Even Airbnb said they don’t experiment anymore.” Some words are cool as copy, and some words should be applied to our organization right away...

Nov 16, 2025Read more

Substack•Data & Decision-Making•English

Use calibrated social media

Is it possible to live in an internet environment filled with content and advertisements without being influenced by them? Could it be that I am naturally mistaking the stimuli and thoughts that someone injected into my subconscious as my own thoughts? The book ‘Stolen Concentration’ explains that big tech social media intentionally provides unlimited stimulating and addictive personalized short-form content...

Nov 2, 2025Read more

Substack•Startup•English

Why young entrepreneurs and middle-aged investors meet

Almost all investors I know who invest in early-stage startups say, “We invest based on people.” Each person may have a different interpretation of what it means to invest in people, but this is what I have been thinking. ‘If you make an investment based solely on the item or market in the initial investment, there is a high probability that you will fail if you are wrong. under...

Oct 19, 2025Read more

Substack•Startup•English

Entrepreneurs are athletes and startups are the Olympics.

When Kakao Ventures helped its family companies with EIR, it did not do much to help successful startups. When things are going well, it's good to hit back and cheer to keep the momentum going. At times like that, you can't even hear what someone is saying next to you. If you ask for help, just help.

Sep 28, 2025Read more

Substack•Engineering Leadership•English

The most important things in the world are not on the Internet.

As Palantir's stock price rises, the position of Forward Deployed Engineer (FDE) is being talked about. They are engineers who reside at customer companies and work with them to find, implement, and solve problems. We looked into how they differ from dispatched engineers in the existing SI industry and consultants in the consulting industry.

Sep 14, 2025Read more

Substack•Engineering Leadership · AI•English

In the AI era, paradoxical opportunities for leaders without authority

This is a question I often hear because of my experience with Silicon Valley and Korean companies. Even though they are the same team leader and manager, why are they so different? Because Korean team leaders are incompetent? no. The structure is different.

Sep 2, 2025Read more

Substack•Data & Decision-Making•English

Nice question.

I like questions. I like questions that make me think. It's painful to be asked certain questions. But that question makes me think, take action, and soon grow.

Aug 17, 2025Read more

Substack•Engineering Leadership · Startup•English

For early startups, start with ‘essence’ rather than shiny methodology.

Author: Taeho | Published: 2025-07-14T08:00:29+09:00 When you start a startup with a few like-minded co-founders and work blindly, you start to see little by little results, but at the same time, you start to feel inadequate about yourself and your team.

Life, Meaning, and AI After Coming Back from Hell

A Mental Model for Building All-Purpose SaaS for Early-Stage Startups

The Era of the Solo Unicorn Has Arrived

A better life through the data provided by my body

Where are knowledge workers going?

Why are we the only ones who fail even though we follow the same example?

Use calibrated social media

Why young entrepreneurs and middle-aged investors meet

Entrepreneurs are athletes and startups are the Olympics.

The most important things in the world are not on the Internet.

In the AI ​​era, paradoxical opportunities for leaders without authority

Nice question.

For early startups, start with ‘essence’ rather than shiny methodology.

How To Write a Good PRD

What Mobile App Developers Can Learn from Michelin Star-Rated Restaurants

Book Review: Conflicted by Ian Leslie

The Joys and Sorrows of Being a Startup Entrepreneur

Why Using Full Names for Development Environments is Important for Effective Communication

The Role of a Chief Technology Officer (CTO) and the Differences with a VP of Engineering

Motivation is a personal journey

INSPIRED - The Right Culture Part

The Benefits of Using Golang in Development

Bridging the Gap: Improving Context-Sharing in a Startup

Wisdoms from "The Almanack of Naval Ravikant"

gRPC and Protocol Buffers: Key Enablers of the Shift-Left Culture in Software Development

Sandplay Therapy: Understanding its Benefits and Approach

Be happy if someone is criticizing someone else

12 strategies for writing better copy, faster.

The 85% rule

Sequoia Pitch Deck Framework

OKR, why was it created and how to use it?

What is TPM? What is the difference from PM?

Social life is like driving

How to Build Wealth by Naval Ravikant

If your goal is big, break it down and achieve it.

Google Big Query Complete Guide Book Review

Acquire, the game that penetrated my life without me even realizing it

The most important thing is managing your energy

Former US President Obama's decision-making process

Correlation between Golang and development culture

North-South, East-West frame to prevent extreme choices

A Short Record of Three Years of Founding a Startup in the US

The Core of a Developer's Collaboration Skill: Work Visibility

Coding Without Getting Hurt

Taeho User Manual @ Banksalad

Starting a business in the U.S., short records of those three years

Delivery Analysis and User Prediction

Getting Into a Large Company With a Computer Science Degree

Why I Like Yoon Jong-shin

Building a Smarter News Service

In the AI era, paradoxical opportunities for leaders without authority