Vuk Djapic, Developer in Belgrade, Serbia

Vuk Djapic

Full-stack Java Developer

Belgrade, Serbia
Toptal Member Since
August 16, 2016

Vuk has 15 years of experience as a developer, consultant, and system architect. Proficient in Java and JavaScript, he has worked on desktop and web applications, microservices, SQL and NoSQL data management solutions, AWS services and deployments, and many more related tools. Vuk always tries to align code, development procedures, and architecture with technology standards and best practices.

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Arcadis Gen
Java, Keycloak, Microservices
Java, Elasticsearch, MySQL, Node.js, RabbitMQ, Spring, Consul
AngularJS, JavaScript, Spring, JGroups, JPA, MongoDB, Java


Java - 10 yearsJavaScript - 9 yearsSpring - 9 yearsSoftware Architecture - 7 yearsJPA - 7 yearsElasticsearch - 5 yearsDomain-driven Design (DDD) - 4 yearsAngular - 3 years


Belgrade, Serbia



Preferred Environment

Java, Spring Boot, Elasticsearch, Apache Lucene, Databases, Microservices, JavaScript, Amazon Elastic Container Service (Amazon ECS), Docker

The most amazing...

...project I created was a microservice solution for legacy apps that a big maritime software company, after initial doubts, accepts and becomes very pleased with.

Work Experience

2021 - 2022

Architecture Owner

Arcadis Gen
  • Influenced overall architectural style of the apps developed, from heavy platform-based mini-applications to DDD style microservices.
  • Guided less experienced developers towards better design and code practices.
  • Participated in planning, feature and task definitions, and development for a very big infrastructure project.
Technologies: Java, Keycloak, Microservices
2017 - 2019

Senior Full-stack Developer | System Architect

  • Redesigned monolith server and other legacy apps to micro-service architecture, based on Spring Boot, REST APIs, Consul service discovery, and RabbitMQ messaging.
  • Participated in planning new features and their place and implementation in micro-service architecture.
  • Actively developed many of the features, including headless Chrome browser HTML to PDF reports generator.
Technologies: Java, Elasticsearch, MySQL, Node.js, RabbitMQ, Spring, Consul
2015 - 2016

Software Development Consultant

  • Developed from the ground-up components on a clustered platform for collecting, processing, and producing various types of financial data.
  • Integrated various APIs with sources of financial data like Thompson, Reuters, and Bloomberg.
  • Built components by using Java, Spring Container, JGroups cluster management, PostgreSQL, MongoDB, and a Quartz scheduler.
  • Developed the front-end administration panel; used JavaScript with Angular and jQuery.
  • Managed the entire component development from the design of classes and choice of technologies to the integration testing with real data.
Technologies: AngularJS, JavaScript, Spring, JGroups, JPA, MongoDB, Java
2012 - 2015

Senior Lead Developer

  • Led small teams of two-to-four developers with big automotive insurance and car parts Zurich client.
  • Coordinated communication with the client and their business analysts, project managers and QA.
  • Managed the analysis of requirements, solution proposals, time, estimations, the division of work, implementation, and code review.
  • Worked with large Swiss and US software companies and their leading developers.
  • Developed the server-side and JavaScript client-side of web applications; using Java and Tomcat.
Technologies: Firefox Extensions, SWT, jQuery, JavaScript, JAX-WS, Java
2010 - 2012

Senior Java Developer

Finsoft (formerly GTech)
  • Developed middleware and mission-critical components in large software system for online gaming and sports betting.
  • Working for SportingBet, a leading British online betting provider.
  • Created Lucene-based components as a middle layer between heavily-loaded database and regional websites.
  • Supported the integration of subsystems with Oracle Enterprise Service Bus.
  • Used Oracle Coherence as a distributed cache and processing layer.
Technologies: Apache Lucene, Oracle Coherence, Java
2007 - 2010

Software Developer

  • Created a web administration panel for a 3G VPN router device with all the business logic on the client side in JavaScript.
  • Developed a web application to track vehicles with GPS and a GPRS device installed, using Java, JSP, and JavaScript.
  • Created desktop Java applications for testing different devices and communicating with them through serial connection.
  • Used Google and Microsoft Maps, and other regional maps for display of vehicles online. Created a similar functionality as in Google and Microsoft Maps, in JavaScript Canvas on top of real maps.
Technologies: JavaScript, Java


Serbian Word Usage Dictionary
A Java Spring Boot app based on Lucene and original text processing algorithms shows word usage, rhymes, similar words, text analysis, word statistics, and other functions. Hosted on AWS ECS with one-click deployment.

Flipico Game
This is an original picture puzzle game with flipped image parts. Your goal is to reveal the original image. Some parts are flipped horizontally or vertically, making it a jumble. Use your mouse to select parts that don't fit and flip them until the whole picture is intact again.

File Searcher
This is a desktop application for searching local file systems. Using Lucene, it can combine search queries and fuzzy names and split files and directories into categories. It was developed as a standalone Java application.
Image of Getting Started with the Elm Programming Language publication

Getting Started with the Elm Programming Language



Java, SQL, JavaScript, Elm, Java 8, CSS, HTML5, ECMAScript (ES6), XQuery, Web Services Description Language (WSDL)


Spring, JPA, Spring Boot, JUnit, Express.js, Spring MVC, Bootstrap, Angular, Jasmine, Jakarta Server Pages (JSP), JMockit, Swing, Apache Velocity, Mockito, Jersey, Apache CXF, Hibernate


Eclipse IDE, Apache Tomcat, Apache Maven, Java Concurrency, FreeMarker, Apache Ignite, Jira, Oracle Coherence, Jenkins, Webpack, Docker Compose, Gulp, Amazon Elastic Container Service (Amazon ECS), Solr, Git, Subversion (SVN), Cobertura, Sonar, IntelliJ IDEA, Jetty, Mercurial, Keycloak, RabbitMQ


REST, Model View Controller (MVC), Refactoring, Design Patterns, Service-oriented Architecture (SOA), BEM, Agile Software Development, Microservices


Software Architecture, Algorithms, Web Services, Chrome Extensions, HTTP, Data Structures, Regular Expressions, Domain-driven Design (DDD), Technical Leadership, Architecture, SOAP, Scalability, Firefox Extensions, Unix Shell Scripting, Ehcache, Enterprise Integration Patterns (EIP), EJB 3, Enterprise Java Beans (EJB), Consul


Java Servlets, Apache Lucene, jQuery, SWT, JAX-RS, Node.js, Backbone.js, React, JMX, JMS, MyBatis, SAX, JAXB, JAX-WS, Eclipse SWT, JGroups


Ubuntu, Eclipse, JBoss, Docker, NetBeans, Windows, CentOS


JSON, MongoDB, PostgreSQL, Elasticsearch, NoSQL, MySQL, Databases


2003 - 2007

Master's Degree in Information Systems and Technologies

University of Belgrade, Faculty of Organizational Sciences - Belgrade, Serbia

1996 - 2000

Diploma in Mathematics, Algorithms

Mathematical Grammar School - Belgrade, Serbia