Tamer Ardal

Tamer
Ardal

Software engineer. I build Java and Spring Boot services for banking and capital markets, and am developing a FIX engine, built in Java with QuickFIX/J, that connects the bank to stock exchanges.

  • 8BeginStringFIX.4.4
  • 9BodyLength139 bytes
  • 35MsgTypeD New Order Single
  • 49SenderCompIDORDERGW
  • 56TargetCompIDEXCHANGE
  • 34MsgSeqNum1042
  • 52SendingTime20261020-07:30:00.125 UTC
  • 11ClOrdIDORD-7731
  • 55SymbolTHYAO Turkish Airlines
  • 54Side1 Buy
  • 38OrderQty500
  • 40OrdType2 Limit
  • 44Price312.75 TRY
  • 59TimeInForce0 Day
  • 60TransactTime20261020-07:30:00.124 UTC
  • 10CheckSum013 sum of bytes mod 256
An example FIX 4.4 order: buy 500 shares of THYAO at 312.75, limit, good for the day. The values are made up. BodyLength (139) and CheckSum (013) are calculated from the message itself. Select a field to see what it means.

Experience

Over three years in banking, capital markets and payments. Most recent first.

2025Aug 2025 to now

Software Engineer Expert

Yapı Kredi Technologies

In-house since August 2025, after a year in an outsourced role at the same bank. I own critical banking systems and work on moving them off legacy architectures.

  • Developing a FIX protocol engine in Java with QuickFIX/J, to replace a third-party product and connect the bank to stock exchanges.
  • Contribute to the migration of monolithic legacy systems to cloud-native microservices in Java and Spring Boot.
  • Built event-driven processing between services with Apache Kafka and Azure Event Hubs.
  • Maintain the PL/SQL packages and SOAP services that keep data consistent and integrated during the move.
  • Led the setup of Redis for caching and UC4 (Automic) for batch scheduling.
  • Deliver full-stack features with Spring Boot and React.

Stack Java, QuickFIX/J, Spring Boot, Kafka, Azure Event Hubs, Redis, PL/SQL, SOAP, UC4 (Automic), React

2024Aug 2024 to Aug 2025

Software Engineer IV

Yapı Kredi Technologies, via Metasis Technology

Banking applications and batch processes, built as an outsourced engineer before moving in-house.

  • Built back-end services and batch jobs with Java, Spring Boot, Spring Batch and JPA, and front-end features in React.
  • Helped split monolithic applications into microservices, applying Domain-Driven Design.
  • Used RabbitMQ queues for asynchronous communication and Redis caching to improve performance.
  • Wrote unit and integration tests with JUnit and Mockito.

Stack Java, Spring Boot, Spring Batch, JPA, RabbitMQ, Redis, React, Bamboo

2023Apr 2023 to Aug 2024

Software Engineer

Firisbe A.Ş.

Front-end and back-end work on a payment facilitator platform.

  • Built features across the Account Management, Bill Payment and Transaction microservices in Java, Spring Boot and React.
  • Maintained a monolithic application on .NET 6.
  • Monitored and debugged microservices through logs in the ELK Stack.

Stack Java, Spring Boot, React, .NET 6, Docker, RabbitMQ, Redis, Flyway, ELK

2021Jun 2021 to Aug 2023

Software Engineer Intern

VantaWorks A.Ş.

Recurring internships alongside university studies.

  • Developed applications with .NET Core and .NET 5.
  • Built mobile apps with Flutter.

Stack .NET Core, .NET 5, Flutter

Work

Projects I worked on, and what part I played in each.

  • FIX engine

    Yapı Kredi Technologies

    The bank reached stock exchanges through a third-party product. I am building a replacement, written in Java with QuickFIX/J.

    Built with Java, QuickFIX/J, FIX protocol

  • Matriks OMS integration

    Yapı Kredi Technologies

    Connected the Matriks order management system to the bank's investment infrastructure. The services talk to each other through events, using Protocol Buffers, Azure Event Hubs, Kafka and RabbitMQ.

    Built with Event-driven architecture, Protocol Buffers, Azure Event Hubs, Kafka, RabbitMQ

  • From legacy to microservices

    Yapı Kredi Technologies

    Critical banking workflows ran on legacy monoliths and Oracle PL/SQL. I contribute to moving them to Java and Spring Boot microservices, and I maintain the PL/SQL packages and SOAP services that keep data consistent during the transition.

    Built with Java, Spring Boot, PL/SQL, SOAP

  • Kubernetes migration

    Yapı Kredi Technologies

    Part of the effort to move existing services onto Kubernetes for deployment and container orchestration.

    Built with Kubernetes, Docker

  • Payment facilitator platform

    Firisbe

    Account Management, Bill Payment and Transaction microservices, with their React interfaces.

    Built with Java, Spring Boot, React

  • Invest+

    Yapı Kredi Technologies

    The bank's investment application, rebuilt for its investment department.

  • IPO platform

    Yapı Kredi Technologies

    Microservices transformation of the IPO platform.

  • Foreign Stock Reminder

    Yapı Kredi Technologies

    Automated e-mail and SMS notifications for foreign shareholders.

Skills

Java at the core, with the systems around it.

Languages
Java, C++, SQL, PL/SQL, TypeScript, JavaScript, C#
Backend
Spring Boot, Spring Batch, Spring Data JPA, Hibernate, REST, GraphQL, SOAP, .NET
Architecture
Microservices, Domain-Driven Design, event-driven architecture, multithreading, concurrency
Messaging and caching
Apache Kafka, Azure Event Hubs, RabbitMQ, Protocol Buffers, Redis
Data
Oracle, PostgreSQL, Flyway
Delivery
Docker, Kubernetes, Jenkins, Bamboo, Git, GitHub, Bitbucket, UC4 (Automic), ELK Stack, Jira, Confluence
Testing
JUnit 5, Mockito, unit and integration testing
Front end
React, TypeScript
Domains
Banking, capital markets, FIX protocol, payments
Ways of working
The full life cycle from system design to CI/CD and deployment, with AI-assisted development for code generation, testing and documentation

Writing

Notes on Java, performance and financial software. Every article is paired with a public-domain artwork.

More on Medium

Education

  • Istanbul University

    Bachelor’s degree in Business

    Sep 2024 to now

  • Trakya University

    Bachelor’s degree in Computer Engineering

    Sep 2020 to Jun 2023

  • Nişantaşı University

    Associate degree in Computer Programming

    Sep 2017 to Jun 2019

Languages Turkish (native), English (B1, intermediate)

Contact

For backend, banking or trading systems work, write to me.

tamerardaal@gmail.com

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