Dejan Cabrilo, Developer in Belgrade, Serbia
Dejan is available for hire
Hire Dejan

Dejan Cabrilo

Verified Expert  in Engineering

Software Engineer and Developer

Belgrade, Serbia
Toptal Member Since
November 23, 2015

Dejan is a passionate software engineer with a decade of experience delivering websites, data analysis, and IT consulting. His programming languages of choice are Java and Python. Dejan also has a lot of experience with JavaScript, Vue, and Angular.


Theme Analytics
Python 3, Pandas, NumPy, Amazon Aurora, Amazon S3 (AWS S3), Amazon EC2...
Angular, JavaScript, JPA, PostgreSQL, Spring, Java, Management...
Smog Srl
AdWords API, Google, JavaScript, MySQL, Zend Framework, PHP, Java




Preferred Environment

Git, IntelliJ IDEA, OS X, Linux

The most amazing...

...project I've worked on was designing and implementing a high-availability system for quantitative trading.

Work Experience


2021 - PRESENT
Theme Analytics
  • Designed and implemented a high-availability system for quantitative trading.
  • Created a framework for storing market data features and trading signals.
  • Created a visualization platform for trading performance.
Technologies: Python 3, Pandas, NumPy, Amazon Aurora, Amazon S3 (AWS S3), Amazon EC2, Amazon Elastic Container Service (Amazon ECS), Docker

Director of Engineering

2013 - 2021
  • Led the development team creating the company's fundraising website.
  • Developed an app allowing users to make t-shirt designs in their browser and generate vector and raster images of final products.
  • Led the development of several applications that helped vendors fulfill orders.
  • Used data science to generate sales data, reports, etc.
  • Created a platform for analyzing costs and profits by using sales data from a database and generating charts.
  • Developed automated REST documentation and a testing system for Spring.
  • Implemented the PayPal REST API, WePay, Mailgun, and
Technologies: Angular, JavaScript, JPA, PostgreSQL, Spring, Java, Management, Amazon Web Services (AWS), AWS Lambda


2010 - 2014
Smog Srl
  • Developed a secondhand domain name market website: using PHP and Zend Framework 2.
  • Developed algorithms for determining the desirability of expiring domain names and implemented them using Java.
  • Created a system to register domain names within parts of a second after they have expired using Java and concurrent programming. Gained a lot of experience with concurrency and network programming.
  • Created a REST API for allowing third party sellers to sell domain names on
  • Managed a database of domain names and created programs to try to discover existence of all registered domain names, using MySQL and Java.
  • Worked on mass deployment of Linux VPS servers.
  • Worked with PayPal classic API.
  • Developed a system for analyzing Google AdWords performance and offering automated suggestions on how to optimize ads.
Technologies: AdWords API, Google, JavaScript, MySQL, Zend Framework, PHP, Java

Web Developer

2013 - 2013
MRM Worldwide
  • Developed various websites, including and
  • Created Facebook games for various giveaway contests.
  • Built a web application for soccer betting and tracking results.
  • Developed a giveaway contest for a beer company.
  • Created a reusable CMS for various projects using Zend Framework 2.
  • Migrated some sites to Python and Django for easier maintainability and deployment.
  • Developed an API for communication with clients via text messages, but facilitating communication with local cell phone service providers.
Technologies: JavaScript, MySQL, Zend Framework, PHP, Django, Python

Developer and Data Analyst

2012 - 2013
CONGRAD project
  • Developed an online questionnaire for surveying graduates of 10 universities which participated in the project using Java and Spring.
  • Developed the project's website at using PHP.
  • Worked on analyzing data collected by the survey with MySQL, R, and SPSS.
  • Coordinated automated communication with survey participants via email.
  • Worked on internationalization and localization of the project.
Technologies: R, MySQL, Spring, PHP, JavaScript, Java

Senior Web Developer

2008 - 2010
Nexta Srl
  • Developed an MVC framework, with a team of other developers, to serve contents of several magazine style sites, including:,,,, using PHP and Postgres.
  • Consolidated a 10-year-old Postgres database to streamline data retrieval from it.
  • Worked with various APIs to provide live score soccer feed for
  • Designed a database to store scores for generic sports and athlete information.
  • Developed an algorithm and implemented it using PHP and Postgres to intelligently determine positive and negative keywords in order to achieve the best SEO.
Technologies: jQuery, JavaScript, PostgreSQL, PHP

Secondhand domain name marketplace.

Automatic Slug POC

A proof of concept of how to use AspectJ in a Spring application to automatically set an entity's slug or URL. For example, if an entity book existed with the property name of "Twelfth Night," its property slug would automatically become "twelfth-night." That is if it hasn't been used yet—which is checked in the repository.

The concept was interesting because I tried to understand whether such an "auto-magical" population of an object's values is possible and desirable. It's easy to do but, as it turns out, tough to debug.

A fundraising tool, similar to Kickstarter but aimed at charities.

Italian Tourism Website
One of several websites powered by the same engine I developed, also including: and
2001 - 2004

Bachelor's Degree in Computer Science

University of London - Goldsmiths


Google AdWords, PayPal API, jQuery, Facebook API, AdWords API, Node.js, Redis Queue, Pandas, NumPy


Redash, Gulp, Java Concurrency, Git, IntelliJ IDEA, Vagrant, Amazon Elastic Container Service (Amazon ECS)


Zend Framework, Spring, AngularJS, Bootstrap, Django, JPA, Angular


PHP, SQL, Python, Java, JavaScript, R, CSS, HTML, AspectJ, Python 3


Data Science, Agile Software Development, Concurrent Programming, Management


Debian Linux, Linux, Amazon Web Services (AWS), Linode, Amazon EC2, MacOS, AWS Lambda, OS X, WordPress, Docker


PostgreSQL, MySQL, Redis, Amazon S3 (AWS S3), Memcached, Amazon Aurora


PayPal, Data Mining, Network Programming, Data Analysis, WePay, Google, Machine Learning, Computer Science, Deep Learning, Facebook Games

Collaboration That Works

How to Work with Toptal

Toptal matches you directly with global industry experts from our network in hours—not weeks or months.


Share your needs

Discuss your requirements and refine your scope in a call with a Toptal domain expert.

Choose your talent

Get a short list of expertly matched talent within 24 hours to review, interview, and choose from.

Start your risk-free talent trial

Work with your chosen talent on a trial basis for up to two weeks. Pay only if you decide to hire them.

Top talent is in high demand.

Start hiring