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Denizhan YıldızDY
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Denizhan Yıldız

@denizhanyldz

Software Engineer at Firisbe developing PCI MPoC payment solutions and a QR code payment flow with BKM TechPOS.

Turkey
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At Firisbe, I develop PCI MPoC solutions that let merchants accept card payments on standard Android devices, along with a digital wallet. I developed the complete QR code payment flow with BKM TechPOS and implemented sale, refund, and void transactions.

I also took part in Firisbe’s PCI DSS audit and laboratory evaluation for PCI MPoC certification, and set up log collection, alerting, and custom Wazuh SIEM rules for the PCI DSS environment. Previously, I worked on purchasing, biometric verification, and music discovery applications, as well as production planning and SAP work orders.

Experience

Work history, roles, and key accomplishments

Firisbe logoFI
Current

Software Engineer

Firisbe

Jan 2026 - Present (10 months)

Technologies: Spring Boot 3.3, RabbitMQ, PostgreSQL, PgBouncer, Docker, Consul, Keycloak, HAProxy, Thales payShield HSM, ISO 8583, Wazuh

Languages: Java 21, Kotlin, Dart, JavaScript

Developing PCI MPoC (Mobile Payments on COTS) solutions that enable merchants to accept card payments on standard Android devices, and a digital wallet product. Backend services are built on a microservice architectu

Inpromax e-Satınalma Çözümleri logoIZ

Software Engineer

Inpromax e-Satınalma Çözümleri

Mar 2024 - Jan 2026 (1 year 10 months)

Technologies: Docker, PostgreSQL, MySQL, OracleDB, Jakarta Framework, Jboss/Wildfly, Oracle Weblogic, Elasticsearch, Maven, J2EE, JSP, Primefaces, Nginx, Haproxy, Hibernate

Languages: Java 8, Java 11, JavaScript, HTML&CSS

Inpromax is a tender and purchasing application. They make it easier for companies to carry out external purchasing and tendering. Inpromax and Intengo work in configuration wi

ETB logoET

Software Engineer

ETB

Apr 2023 - Mar 2024 (11 months)

Technologies: Docker, PostgreSQL, MsSQL, Spring Framework, Play Framework, Elasticsearch, Kibana, Logstash

Languages: Java 8, Scala, JavaScript, HTML&CSS

It ensures that requests from the frontend are directed to Android devices. The frontend was developed using vue.js. Frontend communicates with backend a help of RestAPI. Requests coming from frontend are encrypted and send to the android de

MM

Software Developer

Meet The Music

Apr 2022 - Mar 2023 (11 months)

Technologies: MongoDB, Elasticsearch, Kibana, Logstash, Amazon Web Services, Kafka, Spring Framework, Docker, Spring Cloud, Google Cloud Platform

Languages: Java 17

MeetTheMusic is an mobile app where you can easily meet people you listen to the same song with by listening to songs on Music Platforms.

INEVA Çevre Teknolojileri San. ve Tic. A.Ş. logoIA

Production Responsible

INEVA Çevre Teknolojileri San. ve Tic. A.Ş.

Feb 2020 - Feb 2022 (2 years)

Prapare production plans, production flow diagram
MRP managment and work order with SAP.
Participating in quality management system audits (ISO 14001, 9001, 45001).
Createing and following purchase requisitions with SAP.

BT

Engineer Intern

Burdöksan Döküm Sanayi Ltd. Şti.

Jan 2020 - Feb 2020 (1 month)

Worked as Engineer Intern at Burdöksan Döküm Sanayi Ltd. Şti..

INEVA Çevre Teknolojileri San. ve Tic. A.Ş. logoIA

Engineer Intern

INEVA Çevre Teknolojileri San. ve Tic. A.Ş.

Sep 2019 - Dec 2019 (3 months)

Worked as Engineer Intern at INEVA Çevre Teknolojileri San. ve Tic. A.Ş..

Education

Degrees, certifications, and relevant coursework

UD

Udemy

OWASP Mobile Top 10 2025 : Android & iOS App Security

May 2026

UD

Udemy

OWASP Top 10 2025

May 2026

UD

Udemy

Secure Coding Based On OWASP Top 10 with Practical Examples

May 2026

PH

Programming Hub

Java Certification Course

Mar 2023

BE

Boğaziçi Enstitüsü

Database Management Systems Course

Jan 2022

Balıkesir Üniversitesi | Balikesir University logoBU

Balıkesir Üniversitesi | Balikesir University

Bachelor's degree, Mechanical engineering

2013 - 2019

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