Projects

A selection of projects and systems built by Cihan Dogan across fintech, IoT, and gambling domains.

Here are some of the projects I’ve worked on. Each one represents a different challenge and learning experience.

Payment Gateway System

A highly scalable distributed payment gateway processing 10M+ daily transactions, built with Event Sourcing and CQRS patterns. Includes 3D Pay, End-of-Day processing, and payment orchestration using the SAGA pattern.

Java 11 Spring Boot Kafka Cassandra Redis Event Sourcing CQRS
GitHub

IoT Predictive Maintenance Platform

A hybrid on-premise/cloud platform that collects sensor data from engines and machines, processes it with AI for predictive maintenance. Used by Mercedes and airlines to prevent breakdowns.

Java 11 Spring Boot AWS Terraform Kubernetes DynamoDB Golang
GitHub

Online Gambling Payment & Wallet System

Payment and wallet microservices for a high-transaction online gambling platform, deployed across 7 regions (UK, EU, North America) with 10+ microservices.

Java 17 Spring Boot Kafka MongoDB Docker Kubernetes Dynatrace
GitHub