Senior-led. No layers.
Founded in 2017, Thelan is a small, senior-led team of developers who believe the best software comes from direct access, honest communication, and a genuine understanding of your business. No layers. No hand-offs. The people you talk to are the people who build. Our clients include pharmaceutical distributors, global automotive brands, and enterprise organisations with compliance-grade requirements — across Greece and the US.
Direct Senior AccessYou work directly with the developers building your solution — from the first conversation to final delivery. No account managers, no junior hand-offs.
Built to last, not just to launchWe write clean, documented code and hand over systems that your team can actually maintain and extend.
Delivering production systems for clients across Greece and the US.
Our Values
The foundation of every line of code we write.
Technical Integrity
We don't cut corners. We write clean, maintainable code with proper documentation — because the best time to fix technical debt is before it exists.
Transparent Partnerships
No surprises on timelines, scope, or costs. We communicate early and often, especially when something is harder than expected.
Continuous Evolution
We bridge the gap between reliable legacy systems and the technologies shaping what comes next — without abandoning what already works.
The Team
Ilias Tsiantis
Founder / Lead DeveloperBefore founding Thelan, I spent years in business operations — first as an IT and ERP specialist in the jewellery sector, then as a manager in international food trading in Shanghai. When I returned to Greece, I noticed the same problem everywhere: businesses running on generic software that couldn't handle the specific demands of their operations. I founded Thelan in 2017 to build the kind of purpose-built systems I'd seen businesses actually need — grounded in how companies work, not just in what's technically possible.
I hold a BSc in Computer Science from the Athens University of Economics and Business. My strongest area is custom software development in .NET and C#, with particular experience in pharmaceutical logistics, GDPR compliance, and enterprise integrations.