Gregor Ambrozic, Developer in Ljubljana, Slovenia

Gregor Ambrozic

Full-stack Developer

Ljubljana, Slovenia
Toptal Member Since
November 30, 2015

Gregor is a team leader and full-stack software engineer with more than 15 years of work experience, mostly developing in Java/Grails/Angular and working with databases, directly or through ORMs like Hibernate or GORM. He has done work both in large companies and fast-moving small startups while being in roles of a senior software engineer, a freelancer, and lastly, a CTO. His passion are web applications powered by machine learning.

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Linux, Python, Angular, Hibernate, Gorm, Java, Grails
Linux, AngularJS, jQuery, Grails, Hibernate, Spring, Java
Linux, jQuery, MySQL, Spring MVC, Java


Ljubljana, Slovenia



Preferred Environment

Git, Jira, Visual Studio Code (VS Code), IntelliJ IDEA

The most amazing...

...project I've led was to build an online private jet booking platform.

Work Experience

2014 - PRESENT

  • Led and managed a team of senior professionals in a development team.
  • Co-designed and developed a patent-pending AI/ML solution to analyze private jet traffic and provide pricing in real time.
  • Developed a fleet and booking management software for private jet operators in Angular/Java/Grails.
  • Developed an online private jet booking platform for customers in Angular/Java/Grails.
Technologies: Linux, Python, Angular, Hibernate, Gorm, Java, Grails
2014 - PRESENT

Software Engineer

  • Created a Liferay intranet solution for a small sized company.
  • Worked on a web application for a private jet booking company.
  • Create a Magnolia-powered website with apps for a client company.
  • Developed a Spring MVC rolling road (trucks on trains) booking application for a client company.
  • Developed a Spring MVC back end for JWS/TLS communication with a system for fiscal verification of invoices.
Technologies: Linux, AngularJS, jQuery, Grails, Hibernate, Spring, Java
2012 - 2014

Software Engineer
  • Developed core and new features of a sports social network website in Spring MVC.
  • Provided database optimization for a high-load website.
  • Created various web scrapers and crawlers to fetch data used for analyses.
  • Did ad-hoc engineering problem solving.
  • Cooperated with owners to help shape new features.
Technologies: Linux, jQuery, MySQL, Spring MVC, Java
2011 - 2012

Software Engineer

Epilog d.o.o
  • Developed new back-end features with Java and PL/SQL.
  • Implemented solutions on-site with customers.
  • Created new UI components to be used in the flagship product.
  • Designed and implemented a new translation module in the back end.
  • Communicated with clients remotely and on-site.
Technologies: SQL, Oracle PL/SQL, Swing, Java
2006 - 2011

Software Developer

Medius d.o.o.
  • Developed back-end application features with EJB, JBoss, and Hibernate.
  • Developed UI features with Eclipse SWT and RCP.
  • Did ad-hoc database queries and programming.
  • Built an automatic reporting solution with Eclipse BIRT.
  • Developed web application features with JSF and SEAM.
  • Maintained production applications.
Technologies: Hibernate, Linux, Seam, Oracle, Enterprise Java Beans (EJB), Eclipse RCP, Java
2005 - 2006

Junior Software Developer

Microgramm d.o.o.
  • Developed web application features.
  • Developed features for web programming interfaces.
  • Administrated PostgreSQL database and ad-hoc queries.
  • Wrote documentation.
  • Wrote automated tests and did manual testing.
Technologies: JavaScript, CSS, HTML, Perl
2003 - 2005

Junior SQL Developer

Simobil d.o.o.
  • Rewrote the automatic reporting system.
  • Wrote Ad-hoc SQL queries for data used in other departments.
  • Took care of data warehouse administration over the weekends.
  • Implemented features on data marts.
  • Optimized SQL queries for automatic periodic reporting.
Technologies: PL/SQL, Oracle SQL, Unix

Worked as a full-stack engineer. The tech stack included Java, Spring, MVC, jQuery, Memcached, MySQL, and MongoDB. I did a large part the of back-end code including optimizing database queries, writing internet scrapers/parsers, and doing OAuth2 with different providers.

Worked as a CTO and full-stack engineer for a private jet booking company. The tech stack included Java, Spring, Grails, Angular, MySQL, and AWS.
Image of Why Should Java Developers Give Grails a Chance? publication

Why Should Java Developers Give Grails a Chance?



Java, JavaScript, Perl, HTML, CSS, Python, SQL, Python 3


Hibernate, Spring MVC, Grails, Angular, Spring, Swing, Seam, Gorm, AngularJS


jQuery, React, Node.js, Scikit-learn, Keras


Eclipse IDE, IntelliJ IDEA, Subversion (SVN), Jira, Eclipse RCP, Git


Oracle, Windows, Linux, Unix, Amazon EC2, AWS Elastic Beanstalk, Visual Studio Code (VS Code)


Oracle PL/SQL, Oracle SQL, PL/SQL, MySQL, MongoDB


Team Leadership, Remote Team Leadership, Machine Learning, Enterprise Java Beans (EJB)


Agile Software Development, Extreme Programming


2008 - 2017

Master's Degree in Computer Science

FAMNIT, Univerza na Primorskem - Koper, Slovenia

2003 - 2007

Bachelor of Science Degree in Computer and Information Science

FRI, Univerza v Ljubljani - Ljubljana, Slovenia



Oracle Database 11g Administrator Certified Associate

Oracle Corporation


Oracle Database SQL Expert

Oracle Corporation


Sun Certified Java Programmer 6.0

Sun Microsystems