Ondrej Hirjak

I did the OTC trading platform design, implementation, and operations. I also did cross-team interactions with stakeholders, traders, counterparties, and DevOps.

Skills: HFT, OTC, Rust, AWS, DevOps, Kotlin, FIX, Python

I did the project management of AICO Olympic Pins Catalogue app for both web and mobile.

I oversaw the project, product, and requirements/scope management. I delivered the application on the customer side.

I designed the server and back-end architecture in the Azure cloud. I also oversaw the deployment and operations of the back-end events processing design.

I developed the server back end in Kotlin and the administration front end in Vue.

For CashBox, I led the development of custom ATM-like machine for casinos environment.

WORK DONE
• Analyzed and designed the solution.
• Oversaw the development of the front- and back-end of the server and embedded HW integration part.
• Set up the deployment and supported the operation.

Technologies: Java, Dropwizard, C++, Qt, Protobuf, PostgreSQL, Ansible

For seven years, I've worked on various parts of a complex casino management system codenamed TBO. The system is successfully serving hundreds of thousands of players around the globe and running on thousands of machines.

WORK DONE
• Implemented player management and tracking module.
• Designed, implemented, and operated a distributed jackpot module.
• Developed a new communication layer between slot machines and casino system.
• Consulted, developed and supported deployment and operation of a casino system for a number of clients all around the world.
• Co-designed homegrown tools for deployment and configuration management.
• Led the development and integration of custom HW embedded modules in a casino environment, most notably the "SAS over IP" custom SMIB (slot machine interface board).
• Analyzed and prototyped new features and integrations of a casino management system.

Technologies: Java, Spring, C++, Qt, Protobuf, Oracle, PostgreSQL, Ansible

While working for Unicorn Systems, I developed various parts of internet banking for the Slovakian bank, Tatra Bank. Most notably, I designed and implemented the graph components for the front end.

Technologies: Flex, Flash, Java

Worked on Electronic Toll Collection System for Slovak Republic, in particular Enforcement BackOffice System.

Implemented parts in Java, created build system based on Ant, estimated project and modules scope.

During my PhD studies, I implemented a basic real-time raytracing engine. Before that, during my university studies, I implemented real-time fluid simulation on GPU.

Technologies: C++, GPGPU, CUDA

While interning at NVIDIA, I developed new features and implemented bugfixes for a low-level Linux driver for their graphics cards.

Technologies: C, X11, OpenGL, Linux

Being a part of an extremely capable team of people, I worked on a high-speed peer-to-peer network developed for Cisco called Topos. I implemented various low-level modules and worked on integration layers between high-level components (written in Java) and low-level components (written in C).

Technologies: Java, C, Linux

In the process of migrating from old technologies, I also analyzed an old MS Access-based solution and implemented new reconciliation software for ING bank.

Technologies: C#, ASP.NET, Microsoft SQL

As a part of a complex parking solution for the city of Martin, I designed and developed a parking lot utilization management server.

Technologies: C++, MySQL, Linux

I've also developed various games based on the Cipher Engine. For level editing, I created my own Radiant-like level editor named PhaseONE.

Technologies: Cipher Engine, C++, OpenGL