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Joon Han | Digital Diagnostics
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A Headline Tells Us What Happened, Not What It Means
Watching the current Iran situation unfold, I keep coming back to one thing: the headline is powerful because it gives us something immediate to hold on to. A strike, a warning, a ceasefire claim, a market reaction, a diplomatic statement. Each one arrives with urgency. Each one makes the situation feel more visible. And because it is visible, it can also start to feel more understandable. But that is where the analytical risk begins. A headline tells us what happened. It doe
Joon Han
May 33 min read
Using AI Is Not the Same as Delegating Work to an Agent
AI agents are becoming harder to ignore. Every major platform seems to be moving in the same direction. ChatGPT, Claude, Gemini, and other AI systems are no longer being discussed only as tools that answer questions. They are increasingly being discussed as systems that can plan, act, call tools, complete workflows, and take on more of the work directly. For analysts, that creates two reactions at the same time. One is excitement, because better AI tools can clearly speed up
Joon Han
Apr 263 min read
SQL, Python, and Power BI Are Not Competing for the Same Job
A lot of people talk about SQL, Python, and Power BI as if they are competing for the same place in analytics. They compare them, rank them, and ask which one matters most, as if choosing the “best” one will settle the bigger question. I think that framing causes more confusion than clarity. Most of the confusion is not really about tools. It is about workflow. People use the word analytics as if it describes one skill, when in practice it hides several different jobs. Pulli
Joon Han
Apr 192 min read
Claude Is Powerful. That Is Not the Same as Being Usable.
Claude has been getting a lot of attention lately for how powerful it is. After using Claude Pro for a week, I understand why. The model is strong. But I think the more important question begins where most of the praise stops. Not how impressive the model feels. How long that usefulness actually holds once your workflow starts to depend on it. That was the shift for me. I was not using Claude for coding or technical builds. I was using it to stress test workflows, challenge
Joon Han
Apr 52 min read
From Wix Analytics to GA4 When a Good Starting Point Stops Being Enough
A lot of people new to analytics assume they need the full industry stack from day one. I do not think that is always true. When I first built my portfolio site, Wix Studio free was enough to help me build something real and start paying attention to how people moved through it. Wix supports published free sites, multi-page site structures, and CMS-backed content, which made it possible to build something with enough depth to actually observe. At that stage, I did not need a
Joon Han
Mar 303 min read
The Part of Dashboard Work People Notice First Is Not the Part That Builds Trust
One thing Power BI made much clearer to me is that a dashboard can look polished, interactive, and easy to use while still being built on weak logic underneath. That matters because dashboards are often the part people notice first. They see the charts, the slicers, the interactivity, the clean layout, and the speed at which they can move through the report. A good dashboard can absolutely make analysis easier to explore and understand. But that usefulness depends on somethin
Joon Han
Mar 223 min read
Why Better AI Use Starts With Better Prompting
Before spending money on agents, automation tools, or complex AI workflows, it may be worth fixing something more basic first: the way you prompt. The more I use AI tools like ChatGPT and Gemini, the more I notice the same pattern. Many people already use them every day, but still at the most surface level. They open the tool, type a request, read the answer, and judge the result from there. If the output feels weak, the conclusion often comes quickly: maybe the model is not
Joon Han
Mar 154 min read
The Quiet Counterbalance
On Saturday, 7 March, I volunteered at a briyani distribution event in my neighborhood during Ramadan. The initiative was organized by our RC to support residents during the fasting period. While it primarily served the Muslim community, other residents were welcomed as well. Many of the elderly residents were unfamiliar with the online registration system, so I helped with the process, scanning QR codes, confirming their details, and guiding them to collect their food. It wa
Joon Han
Mar 82 min read
From Foundation to Impact: A 120 Day Transition Log
One hundred and twenty days ago, I stepped away from my role in the medical setting to begin a deliberate build phase in digital analytics. At the start, I did not have a clear direction. I spent the first few weeks exploring where my skills could translate and where they could grow. It was uncomfortable not having certainty. I had no commercial proof. No visibility. No roadmap. So instead of waiting to feel ready, I started building. I built this portfolio. I completed targe
Joon Han
Feb 283 min read


Two Weeks. One Question: Did I Actually Learn It?
For the past two weeks, I immersed myself fully in the Google Data Analytics Professional Certificate. I was spending more than 10 hours a day on it, treating it like a full-time commitment. With the help of ChatGPT and Gemini to clarify concepts and challenge my understanding, I completed a programme that typically takes six to eight months within two focused weeks. At the beginning, I started questioning myself. Finishing a course in two weeks is one thing. Actually retaini
Joon Han
Feb 222 min read
The Quiet Struggle Behind This Transition
A Note for Anyone Standing at the Same Starting Point If you’re in the early stages of a transition and finding it more uncomfortable than you expected, you’re not alone. Some of the hardest parts don’t show up as obstacles you can solve quickly. They show up as uncertainty, patience, and long stretches where progress feels invisible. That can be especially difficult if you’re used to clear milestones or external validation. This piece isn’t meant to offer advice or a roadmap
Joon Han
Feb 82 min read
I Didn’t Start With Skills — I Started With Fit
Where to begin when you know you want to change, but don’t know how A Note for Anyone Standing at the Same Starting Point If you’re considering a career transition and you already have a role in mind, don’t rush. Before worrying about skill gaps, ask whether the role actually suits you. Look beyond job titles. Read reviews, but don’t rely on them blindly. If you can, talk to people in the field. Most importantly, give yourself time. It’s okay to take weeks — or even months —
Joon Han
Feb 13 min read
31, and Learning to Choose Meaning Over Momentum
A Note for Anyone Considering a Career Transition Career transitions shouldn’t be rushed — especially not as a way to escape discomfort. Before deciding: Ask whether your current role still aligns with your interests Talk to people — let them challenge your thinking Be honest about what energises you and what drains you We spend roughly eight hours a day at work. Choosing to rethink that commitment isn’t weakness — it’s responsibility. Once you decide: Identify the gap betwe
Joon Han
Jan 253 min read
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