Angelos Konstantilieris

Angelos Konstantilieris

Full-Stack TypeScript Engineer & AI Developer

Athens, Greece
About

I build production-grade web and mobile applications, CRMs, booking systems, and practical AI tools with TypeScript. I work across React, Next.js, Node.js, NestJS, PostgreSQL, and MongoDB, focusing on clean architecture, reliable data, and software that works for real businesses. Since 2021, I’ve worked as a freelance developer while building AI integration architecture and products such as Matcha, a WhatsApp booking platform.

Currently

Full-Stack TypeScript Engineer & AI Developer

Available for
Selected work

Matcha booking platform

I co-founded Matcha, a live early-access booking platform for fitness studios, salons, clinics, and other service businesses. I designed its architecture, lead development, and built the LangGraph agent, multi-tenant NestJS backend, reservations, payments, calendar sync, and live dashboard updates.

Forge AI orchestration

I built provider-agnostic infrastructure for batch and realtime AI workloads across OpenAI and Anthropic. Its crash-safe worker system coordinates through PostgreSQL and supports routing, leases, retries, recovery, validation, notifications, and observability.

Apollon pet boarding CRM

I developed this production CRM as a solo freelance project over 2.5 years. It brings clients, pets, bookings, rooms, pet taxi coordination, finances, occupancy, and reporting into one operational workflow.

OMNi AI architecture

I designed AI integration architecture for OMNi, a multi-tenant maritime communication platform. The work covers classification, entity extraction, prompt-action workflows, and operational automation for large volumes of maritime email data.

Work Background

Full-Stack TypeScript Developer at LgMAR Software

Athens, Attiki, Greece

Full-Stack Developer at Motion Hellas Ltd.

Athens, Attiki, Greece

Full Stack Engineer at Freelance | Self-Employed

Greece

System Administrator at Bank of Greece

Athens, Attiki, Greece
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