Dejan Velimirovic

January 2022 - ongoing

Badi.rs is B2B software designed for visualization purposes in Serbia. It is a modern platform for managing retail establishments and functions as an advanced Electronic Sales Invoice Registry (ESIR) system.

• This project, led solely by Dejan, encompasses the entire development process from conceptualization and architecture to deployment and realization.

• Badi boasts several key features of eFiscalization essentials, including product reporting system management, receipt exporting, and real-time stock management. Additionally, it seamlessly integrates with third-party services.

• A notable aspect of Badi is its utilization of Golang to create the Electronic Sales Data Controls (ESDC) component. This unique feature communicates with a security element (a smart card with NFC) through a card reader to sign fiscal receipts, facilitating easy submission to the Serbian Tax Authority.

• Badi is accessible across multiple platforms, including Windows, macOS, and Linux, and via web browsers on mobile devices. All features are fully supported on every platform. A mobile app version is currently under development.

January 2017 - February 2020

TradeCore is a platform-as-a-service provider that enables fintech to build next-generation banking and investment products.

• Backend development for the trading service in the form of a platform accessible to other companies via API.

• Leading the development of a mobile application tailored for trading cryptocurrencies.

• Developing different features for the stock market web platform, including aggregating pricing data from multiple sources in real-time, facilitating optimal decision-making.

• Establishing modular architecture allows for flexible integration with various platforms and stock markets through plugins.

• Creation of native modules for Android and iOS, that were not predicted with React.js Native.

• Over time, Dejan's role evolved to Lead Architect. Responsibilities expanded to include: planning and documenting various features, such as one for a real-time notification system utilizing Redis and custom Lua scripts to determine notification destinations.

• Utilization of InfluxDB for fast data querying, particularly for low average prices within specified time intervals.

• Worked in a team of two developers, whereas the other was working mostly on React.js Native and they had one designer.

September 2011 - June 2016

ShiftPlanning is a B2B software solution for shift planning and workload coordination.

• Initially involved in making smaller changes to the product during its final stages.

• Played a key role in planning and developing a mobile web application from scratch to release.

• Assumed high-level managerial responsibilities and collaborated closely with the hiring manager during the mobile app development phase.

• Led the front-end development efforts, primarily focusing on building a single-page application (SPA) using JavaScript and Can.js.

• Collaborated closely with the DevOps team to establish and update the product infrastructure, ensuring seamless operation across multiple servers.

• The product initially couldn't operate on multiple servers. Consequently, they implemented database replication to enable multi-server functionality.

October 2009 - May 2011

WayIDo was a social network for creatives to showcase portfolios in various multimedia formats, such as videos, pictures, and music. Like Facebook, it featured features such as chatting, commenting, and interaction.

• Conducted scraping and full migration from PHP to C++ backend, ensuring backward compatibility of old codes for use and adjustment in the new C++ backend.

• Created proof of concept and compared performances between PHP and C++, resulting in the selection of an optimal solution.

• Implemented a video chat feature within the webpage, utilizing a Flash component rewritten in JavaScript (Red5 server with Java backend).

• Established a feature for the conversion of audio and video files into different formats, adjusting parameters such as size and resolution for compatibility with the social network.

• Handled smaller DevOps tasks and other requirements.

• Contributed to the introduction of functionalities in Redis, a key-value store, since the early stages of development.

• Worked on writing a solution for a Redis Client in PHP, as one did not previously exist.

• Led transition from using Memcached (simple key-value store) to Redis.

• Collaborated within a team of 6 to 8 people, comprising 2 designers, 1 developer for databases, and 4-5 developers, with additional support from 1 DevOps engineer.

March 2008 - September 2009

MasCoders was an outsourcing company for web page development in various industries and niches.

• Primarily worked on web pages utilizing Drupal and Joomla frameworks.

• Undertook a notable project involving the development of an Admin Panel resembling a C-panel for a hosting company, alongside a custom solution tailored for a Dutch company's hosting management needs.

• Collaborated within a team of 5 to 6 full-stack developers to deliver projects efficiently.

November 2005 - August 2008

First Beat Media was a web development company in the advertising and adult entertainment industry niche.

• Implemented modifications to the internal advertising system, adapting ad formats for high-traffic web pages

• Independently led the integration of a payment gateway.

• Collaborated within a small team consisting of two developers and one manager.

Masaryk University, Faculty of Informatics,

Brno, Czech Republic