Four Grit · Since 2015
How far can one person go with AI?
We’re a data and AI company in Pangyo, the tech hub just south of Seoul, and we’ve run on grit from day one.
We paired each kind of grit with one role. Flip the switch to see how far that role reaches with AI.
G
Growth only counts if we’re all headed the same way. So we agree on where we’re going first, then move together.
Developer
Out of reach without AI
When the people who build the product also plan it, nothing gets lost between the idea and the launch.
R
Test fast, fail fast, fix fast. Then we share what we learned with the whole team.
AI developer
Out of reach without AI
We build the AI that builds our AI, so experiments are quick. We can build a demo over a weekend.
We launched three new products this year alone.
I
Nobody has to push us, and fear doesn’t hold us back.
Product planner
Out of reach without AI
We don’t hesitate, even on work we’ve never done before. That’s how our product planners ended up building AI agents themselves.
Our CEO, TJ Park, left a 13-year career at Naver, the South Korean internet giant, to start 4GRIT. We then expanded into Japan with Dentsu as our partner.
T
There’s no “not my job” here. Every problem we find is ours.
Every 4GRITer
Out of reach without AI
We share the work with AI. We never share the responsibility.
Vertical integration
Building a product
What one person covers
One team member
We handle every step of building a product ourselves, from research to DevOps, and with AI, any of our 15 people can pick up any step. So nothing sits waiting for a handoff.
Our goal since 2015
Our methods have changed many times since then. Our goal hasn’t.
AI, our products, the way we work: they’re all just ways to get there.
Products we run today
Customer behavior
Most analytics tools need a tag for every event and a developer for every change. Beusable needs neither. It records every on-screen interaction, then shows where customers look, click, and leave in heatmaps and journey maps.
AI answers
Tracks how eight AI platforms, including ChatGPT, Gemini, and Claude, describe your brand, then automatically optimizes your content so those answers get better. It measures again to prove the gains, and the cycle starts over.
Social trendsNew in 2026
Every morning, it gathers trends, drafts social posts, and checks them against ad regulations. All your team does is approve.
Business metricsNew in 2026
All the friction of traditional BI, gone. No setup, no tool to learn. Just ask, and AI analyzes your data and builds the dashboard or report on the spot.
In-house AI
Turns your company’s documents into a knowledge base, so your AI chatbot cites its sources. It even runs on air-gapped networks.
AI agents, built by chat
Build your own AI tools without any dev infrastructure. Or skip pricey off-the-shelf SaaS, and Beusable will build one just for your company.
Culture shows up in how people talk. Here’s what you’d hear at most companies, next to what you’d hear at ours.
Time
We trust each other’s skills and sense of ownership, so our hours are flexible.
What people usually say: Sorry to bother you, but I’m kind of thinking of heading out early today, if that’s okay?
What we say at 4GRIT: I started two hours early, so I’m heading out two hours early!
Rest
As long as your work is covered, you can take time off whenever you like.
What people usually say: I know you’re busy, and I’m really sorry, but could I take Friday off?
What we say at 4GRIT: I’m taking Friday off!
Ideas
No titles, no chain of command. Anyone can pitch an idea to anyone.
What people usually say: I might be wrong, but maybe we could try it this way, just a thought.
What we say at 4GRIT: Minji, what do you think of this idea?
Direction
Every quarter, we hold a vision session to talk about where 4GRIT has been and where it’s going.
What people usually say: Just tell me what to do.
What we say at 4GRIT: So where are we headed next?
We still ask plenty of questions. Just never for permission.
Where we’re headed and what we care about show up in every corner of our office.
That character?It’s painted on our office window
Our goal since 2015
That coffee?We brew it right here
The red book they’re reading?It’s on our shelf
And the yellow sofa?It’s by our window
We hire year-round. Check our open positions, then email us your resume and a summary of your experience. Any format works.
join@4grit.comManifesto
Grit means finishing the job, even when no one is watching. We go by our own standards, not other people’s judgment. When people say it can’t be done, we try it and judge for ourselves. When we’re wrong, we’re the first to admit it. Even when no one asks, we move first and own the result. If you want to make the call and own it,
we should talk.
Less noise. More grit.
+ AI