Open to opportunities

Öcal Esmer

@calesmer

Message

I build high-scale .NET backend systems for payments, AdTech, IoT, and public digital services.

Turkey

Message

What I'm looking for

I'm looking to lead and build high-scale backend and distributed systems, especially secure payment, IoT, SaaS, public infrastructure, and data-intensive platforms where architecture, performance, and reliability matter.

I've built secure digital payment infrastructure for municipal services at DCL IT Solutions, designing high-availability REST APIs, payment integrations, transaction logging, reconciliation, auditing, and failure recovery.

At Avva Mobile Enterprise Solutions, I led backend architecture across 20+ .NET projects spanning AdTech, retail, analytics, real estate, IoT, consulting, and high-traffic media. I designed Mlink's ad-serving and campaign-management platform, built behavioral tracking infrastructure handling 600+ million monthly requests, and delivered scalable systems using Redis, BigQuery, Azure Event Hubs, SQL Server, and microservices.

I'm also the founder and technical lead of Rebel SmartHome & Building Automation, where I designed and deployed KNX-based building automation and distributed IoT control systems.

Experience

Work history, roles, and key accomplishments

Current

Senior Backend Engineer / Systems Architect

Current

DCL IT Solutions

Sep 2025 - Present (11 months)

Developing mobile application infrastructure for municipalities enabling citizens to pay water bills and other municipal taxes digitally. Designing secure backend systems for payment processing and transaction management.