About · Athens, Greece
Hi, I’m Aggelos Konstantilieris.
I build full-stack TypeScript applications: React and Next.js interfaces, NestJS backends and practical AI integrations. You work directly with me, from understanding the problem to shipping the product.
The work behind the name
I’ve worked as a freelance full-stack developer since 2021. I developed Apollon CRM over 2.5 years during 2021–2024 and continue to maintain it for a pet boarding business. The product brings clients, pets, bookings, rooms and finances into one workflow.
I’m a Senior Full-Stack Developer & AI Lead at LgMAR, where I build AI integration architecture for Omni and developed Forge as its sole engineer.
I also co-founded Matcha in 2025 and lead its engineering: WhatsApp booking, a hosted booking page and a shared calendar.
I start with how people actually work, then design the interface and the systems behind it. Clear workflows, reliable data and maintainable code matter throughout.