Kristina Kalcheva

Managing Director
Legal Expert


Kristina Kalcheva is a legal specialist and a co-founder of Jelurida.
She has a Master of Law and International Relations Degree from Sofia University and has been working as a legal advisor for seven years.
She has experience with private national (Bulgarian), European and International Law. Her professional skills are in the area of Human Rights and Intellectual Property Rights protection on both national and international level.


Lior Yaffe

Managing Director
Senior Developer


As a 3 years old kid, Lior used to multiply double digits numbers in his head in a split second.
At 13, he got his first computer and developed programs for fast prime calculations, finding Pythagorean triples and calculating polynomial approximations.
Lior has a B.A. in computer science from the Technion in Haifa. He eats and drinks programming and technology and has worked in various companies from startups to large corporations, specializing in software development of enterprise applications. He is a true believer in Blockchain technology and its potential to change the world.


Petko Petkov

Core Developer


Petko Petkov is a software developer with experience in financial software, productivity tools and games.
He has BSc in Informatics and MSc in Electronic Governance from Sofia University.
Petko began his career in 2006 as a mobile Java developer. He later switched to server-side Java software, and for two and a half years worked on a system for e-invoicing.
In 2011 he returned to mobile development, and since then he is writing mostly platform-independent C++ and Java for Android. Outside his day job he has been dealing with various other technologies including JavaScript, Java SE and Python. Being generally interested in social science, he started exploring the crypto world in 2013, and later became contributor to the Nxt project.


Tomislav Gountchev

Lead Software Architect


Tomislav Gountchev is a server-side Java developer with more than 15 years of professional experience.
He has a scientific background, having obtained a B.A. in Natural Sciences from Cambridge University, and a Ph.D. in Chemistry from UC Berkeley.
After academia, Tomislav made a career switch and worked as a software engineer for e-commerce companies in the Silicon Valley, NexTag and eBay, with particular interest in Java search engine technology. Later he co-founded Nabble, a website for hosted public forums, where he spent several years as a senior Java engineer, responsible for the design and implementation of multiple backend components. He briefly worked as an R&D software engineer for an open source enterprise CMS company in the Netherlands, before becoming interested in blockchain technology.


Ronald Hoffman

Core Developer


Ronald received two BS degrees from Michigan State University: Electrical Engineering and Computer Science.  He is a National Merit Scholar, Honors College, Tau Beta Pi.
Previously, Ronald was Senior Programmer at IBM.  He retired after 32 years.  He has worked on S/38, AS/400, S/370, S/390. and wrote software for the OS/2, Windows, VM, MVS, z/OS operating systems.  Programmed in Assembler, C, C++. He is now doing Java development on projects for open source cryptocurrencies (Bitcoin, Nxt, Ardor).