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Senior Data Scientist, Mentor & Writer. I share experiences from my data science and personal development journey — friends.arunnthevapalan.com

Welcome to my profile

As a Senior Data Scientist and a Mentor, I help data enthusiasts break into and grow in the world of data science. I share learnings, my approach, and everything about my journey to become a successful data scientist, hoping to inspire you achieve the same.

Besides, I’m embarking on a personal development journey. Who doesn’t want to become their better self?

You can reach out to me on LinkedIn and join my private list of email friends to keep in touch and never miss an update.

My most-read articles:


You can’t go wrong with this

This guide works. (Photo by DocuSign on Unsplash)

I’ve summarized my experience working on 25+ projects over a span of 4 years into this single guide.

We all get cool ideas for projects. Some of them are not feasible, but some of them are. Yet, we don’t implement them. We want to do it, but we don’t know where to start.

What’s worse is, months later, we see someone on LinkedIn sharing a cool demo of a simple idea turned in to project.

Would it be helpful if someone helped you turn your idea into a reality? If you had a clear step-by-step framework to execute, would it…


Data Science, Careers

Surprising ways you’ll benefit when you keep giving unconditionally

Photo by Max Fischer from Pexels

Beyond my 9–5 job as Senior Data Scientist, I mentor students and enthusiasts to break into and grow in the world of data science. This has been one of the most meaningful works I’ve done in the past year.

If you measured success using the dollars I earned, it’s nothing, but the impact on my mentees would tell a different story.

You don’t need to have a PhD or be a professor to mentor someone; you need to have what they’re looking for. It could be an internship, a job or academic expertise. …


My tops tips to be a happier employee

Photo by Prateek Katyal from Pexels

You see people sharing Monday Motivation quotes, but the last thing you can relate Monday to is to feel motivated. Don’t we all dread Mondays?

The alarm goes off in the morning, and you wake up to realize it’s another long week ahead. You have to grind through five whole days again before you’re allowed to have a brief moment of peace. Somehow the weekend passes off in a fly. And the cycle repeats.

It’s not just you; it’s the case for many of us. We are all in this mess together. I understand we can’t miraculously love Mondays, but…


Here’s what you can do about it

Photo by C Technical from Pexels

Do you remember the details of the data science project you worked on a couple of years back? I certainly don’t. Thankfully I wrote some pointers for my CV back then; otherwise, I’d have no clue.

The most recent project you’re working on, how about that? The codes, visualization plots are all vividly painted in your memory. But wouldn’t you forget them all too soon as well?

Science says; that every time we try to recall a memory, it’s less accurate than before. It’s natural to be confident in ourselves, but the truth is we can’t remember them all. …


Data Science, Machine Learning

Mandatory concepts every data scientist should know before it’s too late.

Photo by Alex Knight from Pexels

I always believed model development is the hardest part. Data cleaning — the most time-consuming. Isn’t that we all were taught? Recently I learned something else is even more important.

The performance of the model was great. It’s foolproof; we checked it multiple times. So when we deployed our prediction system and automated the pipeline, we thought we were good.

Oh, how wrong we were.

We had no idea what was waiting for us. The results were good for a few months. Then it happened. Nothing’s changed from our end, but the predictions didn’t make any sense anymore. …


You’re about to learn the most fundamental AI scoping framework that will save your time, money and energy

Photo by Startup Stock Photos from Pexels

Having worked in an AI startup, I was exposed to scoping and architecting AI projects much earlier in my career. I’m now a Senior Data Scientist and have worked on numerous AI projects in the past three years.

Even now, I feel every new project I work on has its learning curve. In the past, as a team, we’ve made many costly mistakes. Mistakes that cost us time, money, and energy. We learnt our lessons. These are lessons you can’t find in any degree program or online courses. You need to be there in the industry to face them.

That’s…


You can tell, I’m excited. Are you coming?

Photo by Kawin Harasai on Unsplash

I made a mistake. I’m going to fix it.

You probably already know me as a senior data scientist and a mentor. I have been sharing learning and experiences from my data science journey. The mistake? I started sharing only when I was 3 years into it.

You don’t see the mistakes I made. You never saw the hours I put in. You see a finished product: a senior data scientist. Wouldn’t it have been better if you saw it from the beginning?

But, in my defence, I was scared. What if people don’t find my learnings worth it? What…


The moment you experience it, there’s no going back.

Photo by Ketut Subiyanto from Pexels

Imagine waking up relaxed, full of energy, and smiling every day. I don’t know about you, but I had always thought these were only part of dramatic scenes in movies until I experienced it for myself.

It’s freaking real.

You can wake up smiling every single day. You will start looking forward to each day. The moment you experience it, trust me, there’s no going back.

In the past, I’ve never looked forward to my mornings. I’d have six alarms snooze before I’d finally wake up just in time to leave for work. If it were a weekend, I would…


Don’t underestimate this simple, effortless, yet powerful technique.

Photo by Alexandr Podvalny from Pexels

My school teacher did something that stuck with me over the years.

After every class, she would take a sheet and tick something. Curious to as what it was, I inquired. “Oh, these are just the lessons I need to teach you all. Since I teach multiple classes, I keep forgetting.”, she said, showing me a sheet with a list of check-boxes.

The kid in me was fascinated. I went home and made similar lists for the subjects I was studying. It’s been a decade, but this practice stuck with me through school, university, work, and even writing.

Creating a…

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