Arun Thulasidharan

Lowkey, you gotta hear about Arun Thulasidharan. This guy’s the real deal in the startup world. He’s a tech dude who’s been grinding for over a decade, and now he’s crushing it as the CEO of Castled.io, a pretty sick platform that helps brands level up their customer involvement using data from the cloud. Basically, he’s building tools that make marketing smarter and more personalized, no bullshit, just straight-up next-gen stuff.

Arun jumped into the scene back in 2010 at Applied Materials, starting as a Senior Software Engineer. That’s where he cut his teeth, building expandable tech, getting his hands dirty with big systems. Then he moved on to Media IQ in 2013, where he was a Senior Software Developer, sharpening his skills even more.

In 2015, he landed at Flipkart India as a Senior Software Development Engineer. That’s a huge deal because Flipkart is one of India’s biggest e-commerce giants. He was there for a couple of years, working on backend systems, making sure everything ran smoothly behind the scenes. You can see he’s always been about building solid, expandable tech.

Fast forward, in 2018, he joined Hevo Data as a Software Design. That’s where he really started to dive deep into data pipelines and marketing platforms, basically, the stuff that powers modern customer involvement. Hevo is known for being a heavy hitter in data integration, so Arun was already working at the intersection of data and marketing, which is exactly what he’d later build his startup around.

Then, in W22, he jumped into Y Combinator with Castled. That’s a huge badge of honor. It’s like getting a gold star from the startup world, showing he’s got something legit. Castled is all about helping companies do smarter marketing by leveraging cloud data warehouses, super hot space right now. Arun’s been around the block enough to know exactly what’s needed, and he’s built a platform that hits the spot.

What’s crazy about Arun is that his whole process screams one thing: he’s obsessed with building stuff that actually makes a difference. He’s been in the trenches at big companies, really understanding how data works at scale, and now he’s taking that knowledge to enable brands to connect better with their customers. It’s like he’s always been about pushing the envelope, taking the complex tech he’s mastered and turning it into something practical, something that moves the needle.

Bottom line? Arun’s story is about persistence, smart tech, and turning experience into innovation. He’s not just another founder; he’s someone who’s been through the grind, learned the ropes, and now he’s making a serious impact in the data and marketing game. No cap, he’s one to watch, someone who’s gonna keep shaping how companies talk to their customers with the power of data.