Stefan is available for hire
Hire StefanStefan Nikolov
Verified Expert in Engineering
Debugging Developer
Rousse, Bulgaria
Toptal member since May 23, 2016
Bio
Stefan is a talented software engineer with over 5 years of professional experience in mobile games development (from porting, to creation, to team lead) and 10 years as back- and front-end web developer (from the earliest HTML+ASP to PHP5+MySQL+JavaScript+jQuery now)
Portfolio
Self-employed
JavaScript
Knowledge Based Intelligence
jQuery, JavaScript, MySQL, PHP
Certipost
SAP IDoc, HIPAA Electronic Data Interchange (EDI), Subversion (SVN), Oracle SQL...
Experience
Availability
Part-time
Preferred Environment
Apache HTTP Server, Git, TortoiseSVN, Visual Studio
The most amazing...
...thing I've developed is an accelerometer-driven music app for iOS with own low-latency sound mixer and compressor.
Work Experience
Open-Source Software Developer
2015 - 2016
Self-employed
- Designed and developed the Behave3d library, a JavaScript library for dynamic behavior and animations of HTML elements.
- Wrote complete documentation+examples of the library, available on a site which itself is a demonstration of the library's functionality (behave3d.net).
Technologies: JavaScript
Web Developer
2010 - 2015
Knowledge Based Intelligence
- Designed, developed, and supported a corporate training and testing system “Knowledge Based Intelligence,” used internally at Alliance Boots GmbH production sites in the UK.
Technologies: jQuery, JavaScript, MySQL, PHP
Software Consultant
2010 - 2010
Certipost
- Consulted for corporate clients on electronic document standards and their technical implementation on various networks (AS2, HTTP, IPX400, Tradanet, etc.). Wrote XSL transformations for different electronic data interchange formats (EDI, MRT, IDOC,…).
Technologies: SAP IDoc, HIPAA Electronic Data Interchange (EDI), Subversion (SVN), Oracle SQL, XSLT, XML
iOS Developer
2009 - 2010
Self-employed
- Developed accelerometer-driven music applications.
- Published titles YossBeats and YossGuitar.
- Researched and developed gesture recognition via accelerometer data.
- Developed a sound mixer + compressor achieving the lowest possible latency on an iOS device for playing (simultaneous) sounds, not using the standard API sound mixing.
Technologies: C++, Objective-C, Xcode, Adobe Photoshop, 3ds Max, OpenGL ES
Mobile Games Developer
2005 - 2009
Gameloft
- Ported the program for the King Kong project. Technologies used: C, BREW on Visual Studio; SVN.
- Ported the program for Platinum Solitare, Real Football 2007, Rayman 3, Gameloft Backgammon, Midnight Bowling, and Mystery Mansion Pinball projects. Technologies used: J2ME on JBuilder, Eclipse, SVN, Perl, and Python.
- Created code for Diamond Rush, Rayman Kart, and The Settlers projects. Technologies used: J2ME on JBuilder, XML via DocumentBuilderFactory, SVN.
- Led the development of CSI: Miami (iPod), Brothers in Arms: Hour of Heroes (iPhone), and Rise Of Lost Empires (iPhone) projects. Technologies used: C++ and ObjectiveC on Visual Studio and XCode, OpenGL ES, iPhone SDK, PowerVR SDK, XML (DocumentBuilderFactory), SVN.
Technologies: Subversion (SVN), OpenGL, JBuilder, Eclipse, Xcode, Visual Studio, Objective-C, C++, C, BREW, J2ME
Web Developer
2003 - 2005
CTS Media GmbH
- Designed and developed a CMS in PHP4 + mySQL employed in projects of the company; developed site-specific modules for this system and other CMS (eZ Publish, MAXcms).
- Designed and programmed CMS-based sites (mainly e-shops).
- Created the graphical design of sites and UI elements.
- Designed and programmed Flash animations (intros, trailers) and components (menus, maps, etc.).
Technologies: HTML, JavaScript, MySQL, PHP
Web Developer
2001 - 2003
MetaVisia
- Created business sites and programmed separate components like menus and Flash banners.
- Participated in the graphic design for some of the projects.
Technologies: Adobe Photoshop, Flash, Active Server Pages (ASP), JavaScript, HTML
Experience
SimpleTime API
I developed a PHP and SQL-based timesheet service implemented as a REST API. This back end is the foundation for the SimpleTime app, enabling users to track and manage their work hours effectively.
SimpleTime App
I created a simple timesheet web application using JavaScript and jQuery. This application seamlessly connects to a REST API on the back end, ensuring smooth communication and data exchange.
Behave3D
http://behave3d.netAuthor of an open-source library, written in JavaScript, for applying 3D transformations, animations, and scripting logic to HTML elements.
CFriendlyCell Image Recognition
I implemented a C++ class within an image recognition system that utilizes the SDL library. This class is critical in identifying objects within images by employing a multi-pass approach to merge neighboring areas, referred to as Friendly Cells, that exhibit similarity. This technique contributes to the system's accuracy and effectiveness in recognizing and delineating objects within the images it processes.
Education
2002 - 2004
Master's Degree in Computer Science
Ruse University - Ruse
1998 - 2002
Bachelor's Degree in Computer Science
Ruse University - Ruse
Skills
Libraries/APIs
jQuery, OpenGL, OpenGL ES, OpenCV, SDL, REST APIs
Tools
Visual Studio, TortoiseSVN, Git, Apache HTTP Server, Flash, Xcode, JBuilder, Subversion (SVN), Adobe Photoshop, 3ds Max
Languages
JavaScript, PHP, HTML, Active Server Pages (ASP), C, Objective-C, XML, XSLT, C++, SQL
Platforms
J2ME, BREW, Eclipse
Storage
MySQL, Oracle SQL
Other
Debugging, HIPAA Electronic Data Interchange (EDI), SAP IDoc, Research & Critical Thinking
Collaboration That Works
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