Java

Pavol Rajzák

Professional Java Developer

About me

Professional software developer with focus on Java web applications and web in general. Several years of experience combined with open-mindedness towards new technologies. Feels at home both in backend and frontend development.

Contact

Hobbies and interests

Music
Nature
Travelling
Cinema
Sports
Computers

Work experience

Senior software developer

Smartman June 2022 - Present Bratislava, Slovakia

Merchant Boarding applications for POS/Ecommerce terminals service provider (12/2022 - now)

Java 17 Maven Spring Boot GraphQL JPA/Hibernate Camunda BPMN Oracle DB React Git JUnit 5

SaFi - mobile-first banking application for Phillipines (06/2022 - 11/2022)

Kotlin Gradle Micronaut Apache Kafka Google Cloud Platform Docker Kubernetes Git Github ThoughtMachine JUnit 5 Testcontainers

Software architect

Itera October 2020 – May 2022 Bratislava, Slovakia

Tech lead

Itera October 2017 – September 2020 Bratislava, Slovakia

Senior Developer

Itera October 2015 – September 2017 Bratislava, Slovakia

System for control and monitoring of traffic systems in tunnels, roads and bridges (10/2018 - 05/2022)

Java 8/11 JavaFX RXJava JDBI JAX-RS/Jersey JavaScript React Redux Jest Bootstrap Maven Easymock Git Docker Apache Kafka Kafka Streams

Secure E-ID solution for signing and authentication (07/2017 - 05/2018)

JavaJUnit BouncyCastle JCE Hamcrest JaCoCo Maven Mockito PowerMock SonarQube Git Confluence JIRA Jenkins UpSource

Insurance portal applications (01/2017 - 06/2017)

Java JavaScript Angular Grunt JSHint ES5 Karma DB2 Jetty REST Maven Spring Apache Tomcat Git TeamCity

Financial advisory application for clients of banks (08/2016 - 12/2016)

Java JavaScript React Flux Flowtype ES6 Webpack Mocha Oracle Postgre REST Maven Spring Apache Tomcat Git Jenkins

Client applications for Central Securities Depository (10/2015 - 06/2016)

Java JavaScript React ES6 Webpack Karma Mocha DB2 REST Maven Hibernate Spring ESB Apache Tomcat OpenShift Git SonarQube Jenkins

Professional Java Engineer

ERNI (Slovakia) s.r.o. October 2013 – August 2015 Bratislava, Slovakia

Junior Java Engineer

ERNI (Slovakia) s.r.o. September 2012 – September 2013 Bratislava, Slovakia

Web application for sensor-based measurement devices (05/2015 - 08/2015)

Angular.js CoffeeScript Gulp.js Karma.js Jasmine SVG Canvas D3.js

Web Applications for Reinsurance Company (08/2013 - 05/2015)

Java Spring framework Spring Boot Spring-WS Apache Tomcat Oracle 11g PrimeFaces JSF JPA Hibernate SVN Maven

Set of applications for photovoltaic inverters manufacturer (09/2012 - 11/2014)

Java EE Seam 2 MySQL JBoss AS (5,7) PHP Java FX Debian Linux Git Maven jQuery

Programmer

E-zone s.r.o. February 2009 – August 2012 Kosice, Slovakia

Online Reservations and Booking Web Application

PHP MySQL XHTML CSS JavaScript JQuery

Technical support

Centre of Applied Computer Science UPJS Kosice November 2009 – February 2012 Kosice, Slovakia

Computer hardware and software malfunction diagnosis, problem solving, technical support for users

Freelance Java Developer

2010 – 2012 Kosice, Slovakia

Regional Statistics Web Portal

Java Web Application JSP Servlets Hibernate XHTML CSS JQuery MySQL

Online Banking Reputation Manager

Java Hibernate MySQL

Technical support

Sageteam s.r.o. November 2008 – January 2011 Kosice, Slovakia

Communicating with clients, solving software and hardware difficulties, installing updates, etc.

Certifications

Oracle Certified Professional Java SE 6 Programmer
Oracle, 05/2013
Functional Programming Principles in Scala
Coursera, 11/2013
Certified Professional for Software Architecture – Foundation Level
iSAQB, 09/2014
Oracle Certified Expert Java EE 6 Java Persistence API Developer
Oracle, 01/2015
Oracle Cloud Infrastructure Foundations 2020 Certified Associate
Oracle, 05/2020
Confluent Certified Developer for Apache Kafka
Confluent, 02/2021 - 02/2023

Skills

Programming (main)

Java
HTML, CSS
SQL
JavaScript
Kotlin

Languages

Slovak
English
German

Workshops and presentations

Presentations

Kotlin - language overview (Public / 2016)
Going offline - Service worker API (Itera / 2017)
FaaS - Serverless (Public / 2017)
Everyday Git - best practices (Itera / 2018)
JavaScript - Application bundling and Task runners (Itera / 2018)
Java 2020 (Itera / 2020)
Event Sourcing with Kafka Streams (Itera / 2021)

Workshops

Spring Boot - workshop (Public / 2016)
Kotlin Hackathon (Itera / 2016)
Intellij IDEA - showcase (Itera / 2016)
Kotlin 2018 - Oslo workshop (Public / 2018)
Itera Dev Academy (Public / 2018 - 2019)
How to hack unsecure web application (Itera / 2020)
Kafka introduction in 5 weeks (series of workshops, Itera / 2022)

Education

Mgr.

Pavol Jozef Safárik Univerzity in Kosice

Master Computer science 2010 – 2012

University of Utrecht

Exchange programme 2011

Bc.

Pavol Jozef Safárik Univerzity in Kosice

Bachelor Computer science 2007 – 2010

© Pavol Rajzak, 2020