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OSMAN DENİZ / SENIOR SOFTWARE DEVELOPERIstanbul, Türkiye

Complex flows.
Solid systems.

Hi, I’m Osman. I build payment applications with .NET and microservices. From mobile wallets to global payment integrations, I take ownership from technical design through production.

Explore my workLet’s connect
OD / SYSTEMS ARCHITECTURE
.NETMICROSERVICES Mobile WalletBACKEND API { }INTEGRATIONS BANKING Payment GatewayTRANSACTION FLOW
+ONE FOCUS. CONNECTED SYSTEMS.+
FROM CODE TO THE REAL WORLD↓SCROLL TO EXPLORE
.NET & C#Microservice ArchitecturePayment SystemsAPI Integrations

01 / SELECTED WORK

Real needs.
Working solutions.

Products I have contributed to and responsibilities I have owned for banks and electronic money institutions.

GLOBAL PAYMENT INTEGRATION/01

Visa Direct
Connect Card

End-to-end integration ownership, from technical design through certification and production deployment.

  • .NET
  • API Integration
  • Cross-border Payments
My contribution & technical scope

I independently designed and implemented the architecture and integration of Visa Direct Connect Card. I took ownership of development, certification and production deployment, and contributed to global payment and cross-border financial service integrations.

İstanbul Ödeme ve Elektronik Para A.Ş.
DIGITAL FINANCE/02

Mobile wallets &
money transfers

Backend APIs and money transfer modules behind the mobile wallet experience.

  • .NET
  • Microservices
  • REST API
My contribution & technical scope

I developed mobile wallet backend APIs within a microservices architecture. I worked on the design and maintenance of money transfer APIs and transaction modules, as well as integration and functional testing.

İstanbul Ödeme ve Elektronik Para A.Ş.
PAYMENT INFRASTRUCTURE/03

Virtual POS &
payment gateways

Payment infrastructure connecting banks, merchants and different payment channels.

  • .NET
  • PostgreSQL
  • Oracle
My contribution & technical scope

At PayCore, I contributed to Virtual POS, PPG, TTS and ICA Payment Gateway products. My work covered bank virtual POS infrastructure, merchant payments, vehicle identification and bridge payment systems.

PayCore
BANKING INTEGRATIONS/04

Connecting
financial systems

From authorization messages to centralized SMS services, communication between banking systems.

  • .NET Framework
  • RabbitMQ
  • WCF / REST
My contribution & technical scope

I worked on Newface for card, customer, merchant and POS management; Gateway for authorization message routing; SMS Processor for centralized messaging; and web services connecting banks to core systems.

PayCore

02 / EXPERIENCE

More ownership.
With every step.

LinkedIn
Aug 2024 — PresentCURRENT

Senior Software Developer

İstanbul Ödeme ve Elektronik Para A.Ş.

Mobile wallets, money transfers and global payment integrations. Architecture, development, certification and production deployment for Visa Direct Connect Card.

Jan 2023 — Aug 2024

Software Development Specialist

PayCore

Virtual POS and Payment Gateway products. Financial service integrations, .NET applications and relational databases.

Sep 2021 — Jan 2023

Software Specialist Assistant

PayCore

Banking applications, integration services and SMS gateways. .NET Core, Entity Framework, WCF, RabbitMQ and Elasticsearch.

03 / ABOUT

Care for the details.
An eye on the whole.

I’m a computer engineer building applications used by banks and electronic money institutions. Working across the layers of payment systems has taught me to consider how each feature fits into the wider system.

Today, my focus is backend development with .NET, microservice architectures and financial system integrations. I value contributing across the entire process, from technical design and testing to production.

EDUCATION

Karadeniz Technical University

Computer Engineering · 2015 — 2020

LEARNING & SHARING

Learning architecture. Sharing knowledge.

Training in software architecture, design patterns and container technologies. Introduction to C Programming instructor at IEEE KTU Computer Society.

On my workbench.

Technologies I have worked with in production.

APPLICATION & ARCHITECTURE

  • C#
  • .NET / .NET Core
  • .NET Framework
  • Microservices
  • Entity Framework

DATA & MESSAGING

  • PostgreSQL
  • MS SQL
  • Oracle
  • RabbitMQ
  • MassTransit

INTEGRATION & OPERATIONS

  • REST API
  • WCF / SOAP
  • Elasticsearch
  • Kibana
  • Keycloak
  • HashiCorp Vault
  • Hangfire

04 / CONTACT

Let’s start with
a good conversation.

A project, a technical idea, or simply a hello.

LinkedIn