Marcin Szymczak

Building backend of server/database/access rights provisioning system

Interviewing candicates for various java/integration/architecture roles

Designing and implementing https://locit.pl application Technologies: Hibernate, JPA, AngularJS, Spring(Core, AOP, Data, Security, Validation), Web Services, Postgres, SQL, Linux, Svn, Maven, Junit, REST Architecture: Very modular DDD architecture, scalable to microservices

Designing and implementing https://locit.pl application Technologies: Hibernate, JPA, AngularJS, Spring(Core, AOP, Data, Security, Validation), Web Services, Postgres, Postgis, SQL, Linux, Svn, Maven, Junit, REST, JasperReports, Swagger, RPC, Groovy, Spock, Gradle, Here API Architecture: Microservices

Developing back-end of telecommunication application with very high availability, disaster recovery, clustering, data replication, multi site deployment. Technologies - Java EE, JPA, EJB, JSP, Web Services, SOAP, JMS, Oracle Database, SQL, JDBC, Eclipselink, JAXB, SAX, Mercurial, Maven, Linux, Junit, Jenkins, Nexus, WebLogic, Tomcat, Eclipse, Sonar, FindBugs, PMD Project size: 500K lines of code. Team size: 20 specialists. Project is developed in different cities with significant timezone difference.

Writing new application for big insurance company. Technologies - Java EE, JPA, Hibernate, Echcache GWT, GWTP, GXT, Web Services, SOAP, ESB, Liferay, Mercurial, SVN, Maven, SQL Project size: 100K lines of code. Team size: 8 specialists.

Implementing new features and bug fixing in large scale Java EE application for telecom operator. Implementation of requirements at server and database side. Technologies - Java EE, JPA, EJB, JSP, JSF, Web Services, SOAP, JMS, Struts, Portlets, Liferay, JBoss Cluster, Spring, Hibernate, JDBC, Oracle Database, SQL, SVN, Maven, Ant, Linux, JBoss ESB, Junit, Mockito, Jenkins Project Size: Around 4.5 million lines of code (1.5M of pure java). Team size: 35 specialists.

Technologies - Java EE, JPA, EJB, DB2, REST, SOAP, Mule ESB, JAXB, Tomcat, IBM Websphere, Git, JUnit, Maven Social - Contatct with client, Suggesting technical solutions for business requirements. Responsibilities - Creating serial bus, which was used to connect multiple distributed systems. Design and implementation of web services. Bus has proven to be highly scalable and reliable. Good usage of design pattern provided easy maintenance for future developers.

Technologies – Java EE, JPA, OpenJPA, DB2, SQL, Web Services, REST, Struts, IBM E-Commerce, IBM Web Sphere, IntelliJ Idea, Maven, Nexus, JUnit, Git, SVN, Python, Django, Linux Responsibilities – Developing communication between application and external magazine system with SOAP web services. Persistence of results. Communication was well tested and was very reliable.

Technologies – Java EE ,JPA, Hibernate, JSF, PostgreSQL, SQL, SVN, Tomcat, Linux, Maven, Eclipse Responsibilities – Writing multi tier Java EE application. I was responsible for back end of application. I have refactorized existing code and improved structure of database. My refactorization substantially improved architecture of application. Changing structure of database improved performance for ~30%.

Thesis: Comparison of selected persistence methods in java I took courses in: Advanced Databases Application Programming - Java & XML Programming in Java System Analysis & Computer Project Management Android Programming IT applications in Business

Specialization in software engineering and algorithms Thesis: Software defect prediction based on data mining methods.