Writing

Substack•AI · Startup•English

The Tools Got Better, but the Work Did Not Change

AI is changing the world of knowledge workers. But in a shift often compared to the Industrial Revolution, what is actually changing, and what is not?

Feb 23, 20267 min

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, 202613 min

Substack•Data & Decision-Making · Health•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, 202610 min

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 15, 202511 min

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.

Dec 1, 20258 min

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 17, 20259 min

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 3, 20259 min

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 20, 20256 min

Substack•Engineering Leadership•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 29, 20258 min

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 15, 20259 min

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 3, 20257 min

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 18, 20254 min

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.

Jul 14, 20259 min

How To Write a Good PRD

The PRD describes the product your company will build. It drives the efforts of the entire product team and the company's sales, marketing and customer support ef...

Jul 19, 202442 min

Website•Data & Decision-Making•English

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

The pursuit of perfection at Michelin star-rated restaurants goes beyond the plate. In mobile app development, we can take inspiration from these restaurants' com...

May 23, 20232 min

Book Review: Conflicted by Ian Leslie

The book "Conflicted by Ian Leslie" explores the idea that humans have not evolved to be perfect individuals. Each person has their own biases and tendencies to c...

Feb 25, 20231 min

The Joys and Sorrows of Being a Startup Entrepreneur

Starting a business is an exciting journey filled with both joy and sorrow. The highs of success and the lows of failure can be intense, making the life of a star...

Feb 17, 20235 min

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

As a software development team, we use various environments such as production, staging, development, and more. Each environment serves a specific purpose, and ha...

Feb 17, 20236 min

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

A Chief Technology Officer (CTO) is a critical executive role within a company that is responsible for overseeing the company's technological strategies and ensur...

Feb 16, 20234 min

Website•Startup · Data & Decision-Making•English

Motivation is a personal journey

Motivation is a critical component of success and personal fulfillment. It drives us to pursue our passions, set and achieve our goals, and overcome challenges. H...

Feb 13, 20233 min

INSPIRED - The Right Culture Part

We've worked through quite a lot of information, and I believe it would useful at this point to step back and consider the range and scope of how the product mana...

Feb 8, 202316 min

The Benefits of Using Golang in Development

Actuating Google Production: How Google's Site Reliability Engineering Team Uses Go - The Go Programming Language

Feb 8, 20232 min

Bridging the Gap: Improving Context-Sharing in a Startup

In today's fast-paced and rapidly evolving business landscape, effective communication and collaboration are critical for success. However, in some startups, empl...

Feb 8, 20233 min

Wisdoms from "The Almanack of Naval Ravikant"

This book collects and curates Naval's wisdom from Twitter, Podcasts, and Essays over the past decade. The wisdom of Naval Ravikant, created and edited by Eric Jo...

Feb 7, 20233 min

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

The shift-left culture in software development is a method that prioritizes early detection and resolution of issues. This leads to higher quality software and a...

Feb 7, 20233 min

Sandplay Therapy: Understanding its Benefits and Approach

Sandplay Therapy is a form of expressive therapy that utilizes sand, miniatures, and other objects to help individuals explore and process their emotions, thought...

Feb 7, 20235 min

Be happy if someone is criticizing someone else

Be happy if someone is criticizing someone else Collection: Shorts URL: https://taeho.io/pages/b6352a3f-2721-4691-bc7d-cef958d24e8f PostedAt: 2022-12-12T00:50:00.000Z UpdatedAt: 2023-05-13T04:49:06.029Z If someone is criticizing someone else, be happy to say it.

Dec 12, 20222 min

12 strategies for writing better copy, faster.

The highest-paid copywriter in history: Gary Halbert. His legendary sales letters generated over $1,000,000,000 in revenue. And in one of his very last letters, h...

Dec 4, 20224 min

The 85% rule

When an athlete is told to run at 85% they run faster than if they're told to run at 100%.

Dec 4, 20222 min

Website•Data & Decision-Making•English

Sequoia Pitch Deck Framework

Sequoia Capital, the VC behind Airbnb, Uber, and WhatsApp, has backed over 300 startups. Their pitch deck framework has funded over $3.3 trillion dollars in marke...

Dec 4, 20223 min

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

Collection: Shorts URL: https://taeho.io/pages/72113ce2-0a24-40ee-a6ad-05c205e589a7 PostedAt: 2022-01-05T12:00:00.000Z UpdatedAt: 2023-05-13T04:49:28.452Z OKR, why was it created and how to use it?

Jan 5, 20229 min

What is TPM? What is the difference from PM?

Collection: Shorts URL: https://taeho.io/pages/0c7e82f8-e8fc-4cdb-8a9f-93ea7972bf9a PostedAt: 2021-12-17T00:10:00.000Z UpdatedAt: 2023-05-13T04:49:21.430Z What is TPM?

Dec 17, 20214 min

Social life is like driving

Social life is like driving Collection: Shorts URL: https://taeho.io/pages/3106ef22-63eb-409a-b4a7-875c52b2a0b8 PostedAt: 2021-12-11T09:32:00.000Z UpdatedAt: 2021-12-11T09:33:00.000Z Social life is like driving.

Dec 11, 20211 min

How to Build Wealth by Naval Ravikant

How to Build Wealth by Naval Ravikant Collection: Shorts URL: https://taeho.io/pages/99ced5f5-0d74-45b3-b498-215c0a98f2ef PostedAt: 2021-08-12T23:09:00.000Z UpdatedAt: 2021-08-13T23:51:00.000Z How to build wealth by Naval Ravikant cover Almanack of Naval Ravikant This book col...

Aug 13, 202114 min

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

Collection: Shorts URL: https://taeho.io/pages/b600d063-22cf-4a00-b51c-06b11a228c29 PostedAt: 2021-06-13T12:30:00.000Z UpdatedAt: 2021-06-14T10:14:00.000Z If the goal is big, break it down and achieve it cover I didn't know about it when I entered school 20 years ago, but if I...

Jun 13, 20219 min

Website•AI•English

Google Big Query Complete Guide Book Review

Google Big Query Complete Guide Book Review Collection: Shorts URL: https://taeho.io/pages/46c13953-5b46-4f1c-909d-896d65e067cb PostedAt: 2021-06-06T12:30:00.000Z UpdatedAt: 2021-06-07T03:23:00.000Z Google Big Query complete guide book report cover Google Big Query Complete Gu...

Jun 6, 20216 min

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

Acquire, the game that penetrated my life without me even realizing it Collection: Shorts URL: https://taeho.io/pages/332c4eb5-e2a6-430e-b8b8-a7cdd03d27f8 PostedAt: 2021-06-01T13:40:00.000Z UpdatedAt: 2021-06-12T08:25:00.000Z Acquire, the game that penetrated my life without me even knowing it, cover There is a board game called Acquire.

Jun 1, 20214 min

Website•Data & Decision-Making•English

The most important thing is managing your energy

The most important thing is managing your energy Collection: Shorts URL: https://taeho.io/pages/7970d920-0b37-4b96-a887-eb6ed471d061 PostedAt: 2021-06-01T08:21:00.000Z UpdatedAt: 2021-06-03T03:46:00.000Z The most important thing is to manage your energy cover There is a chapter called The Energy Metric in How to Fail at Almost Everything and Still Win Big, which Scott Adams, famous as the author of the comic Dilbert, published in 2013 and became famous as a New York Times bestseller.

Jun 1, 20215 min

Former US President Obama's decision-making process

Former US President Obama's decision-making process Collection: Shorts URL: https://taeho.io/pages/322dd223-81dc-4bac-aa8a-6acfbb3e04e2 PostedAt: 2021-06-01T08:06:00.000Z UpdatedAt: 2021-06-01T08:40:00.000Z Former US President Obama's decision-making process cover How I Approach the Toughest Decisions One of the first things I discovered as President of the United States was that no decision that landed on my desk had an easy, tidy answer.

Jun 1, 20212 min

Correlation between Golang and development culture

Correlation between Golang and development culture Collection: Shorts URL: https://taeho.io/pages/fb96464c-ded2-4489-aa5e-b5f61d8c1c8d PostedAt: 2021-06-01T08:00:00.000Z UpdatedAt: 2021-06-01T14:45:00.000Z Actuating Google Production: How Google's Site Reliability Engineering Team Uses Go Google runs a small number of very large services.

Jun 1, 20213 min

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

North-South, East-West frame to prevent extreme choices Collection: Shorts URL: https://taeho.io/pages/d6e465b7-1fd2-4423-89dd-dd1ce7d4824d PostedAt: 2021-05-29T01:09:00.000Z UpdatedAt: 2022-04-12T11:38:00.000Z Summary of Naver Map employee suicide case: “This is not suicide, but murder” (Blind, KakaoTalk capture) On May 28, 2021, Blind is currently in an uproar due to the suicide of a Naver employee.

May 29, 20214 min

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

This article was written in 2015. Looking back at the short notes I had backed up at the end of the year, I reorganized them into brief entries. The past three years were extremely hard, but they made me grow, gave me my own view of the world, and left me with another dream.

May 25, 202148 min

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

This article is a summary of a lecture on why work visibility matters for someone who has just finished a three-month probation period at Banksalad and is starting their first software engineering career. Coding and design are not the whole of development. It discusses how to begin strengthening the collaboration and communication skills that software engineers need.

May 25, 20219 min

Coding Without Getting Hurt

Essential gear for a developer with more than 10 years of coding experience who wants to keep coding without hurting their body.

May 25, 20214 min