Sponsors and Partners

If you want to help the biggest Bulgarian conference for Free & Open Source Software, we’ll be delighted to find a way for you to join this OpenFest and to promote you, your company and/or products in a way that’s productive for you and for our visitors.

If you want for us to show how we can be of help, please contact us:

Yana Petrova (e-mail: yana@openfest.org)

Pure Water is a leading supplier in the field of water treatment authorized distributor of several well-known manufactures in the field. Their portfolio includes variety of filtrating and purifying water dispensers, already recognized in office locations as cost saving and environmental friendly solution.


Software AG helps organizations achieve their business objectives faster. The company’s big data, integration and business process technologies enable customers to drive operational efficiency, modernize their systems and optimize processes for smarter decisions and better service. Building on almost 50 years of customer-centric innovation, the company is ranked as a “leader” in more than a dozen market categories. We are headquartered in Germany and have R&D centers in all major IT hubs in the world. Our Bulgarian office was established in 2006 and grew up significantly over the past 12+ years. In Sofia we employ 250+ people in various departments such as R&D, Professional Services, Global Information Services, Cloud Service Operations, Security & Compliance, Digital Marketing etc. and have established ourselves as the third largest R&D center of the company.
Software AG:
• is based in Darmstadt, Germany;
• has over 4700 employees;
• has over 4 000 global customers in 70 countries;
• is one of the largest enterprise integration software vendor in the world;
• has over 65 global business and technology partners.
Respected customers in key industries:
• Banking;
• Consumer Packaged Goods;
• Process industries;
• Telecommunications;
• Manufacturing;
• Retail;
• Government;
• Education;
We believe that our people are our key competitive advantage. We strive to create a team-oriented environment that fosters high performance and productivity, respect, security, reward, and career development, while offering a balance between work and personal life.
Please search our current job openings to learn more about our exciting career opportunities in Bulgaria.


We are SumUp. We believe in the heroes of the day. Those who have the courage to chase their dreams and make them happen. Our teams in Europe, South America and the US work with an entrepreneur’s spirit and the belief that the team is above all, while helping small business owners to be successful.


IPACCT is one of the leading Internet providers in Bulgaria. Its start was in 2000, and from 2003 provides assistance to other ISPs with its own software.

vmware bulgaria logo

VMware established its representative office in Bulgaria in 2007 and has since then become one of the largest IT investors in the country. With an increased workforce of more than five times over the past twelve years and with an in-depth expertise in core virtualization, management and automation, availability, disaster recovery and analytics, the Sofia team is crucial for serving the needs of some of the world’s largest businesses. Major milestones of the team’s development are the creation of the revenue generating Professional Services Center of Excellence and its innovation lab that works on projects in the fields of Open Source, Internet of Things and Machine learning emerging technologies.

A dedicated Bulgarian employer, VMware attracts talent globally with its work on cutting edge technologies and projects with global impact, multiple programs and initiatives for personal and professional development. The Sofia team employees some of the world’s best experts in software development, product management, quality engineering and technical publications but also business operations expertise within the growing financial and business services team, offering in-depth skills around finance, business analytics and business intelligence.

All of this has transformed VMware’s Bulgaria operations from an R&D facility to a multifunctional hub with product, revenue generating professional services and business operations teams.


Zoiper, the softphone app and SDK, is fully developed for Android, iOS, Windows, macOS, and Linux, by an international team located in Sofia, Bulgaria.The technologies and languages used are: Automatic Speech Recognition, Deep Learning, JavaScript, Node.js, Docker, Express, MongoDB, RxJS, Java, webRTC, C++, Objective-C, Swift, Kotlin, a few lines written in .NET.
The team plays with PBX-es, Push servers, and other RTC goodies. Zoiper is proudly big around the world and trusted by tens of millions of users and thousands of businesses. From large VoLTE and IMS implementations, ventures in Aviation, Transport, Health, NGO/NPO, Government, to tiny one-man communication bits, the Zoiper team gets to develop unusual, fun, and challenging ideas, based on the Zoiper architecture. The company’s new spin-off innovation projects are based on advanced RTC technologies. The team is keeping the spin-offs a secret, but we know they have a lot to do with new better ways of communicating, heavy integration, and bananas.

initLab е Hackerspace на София, място за събиране на различни хора с хакерско мислене и интересни идеи.


Headquartered in California, Konsulko works with their customers throughout North America, Europe and Asia. Their European subsidiary, Konsulko Ltd is based in Sofia, Bulgaria. If you are building a new product, They’d love to talk with you about engaging Konsulko’s engineering expertise and experience on your project. Or if you’re a software developer with a passion for Linux, please contact them about joining the Konsulko team.

Semantic technology makes everything connected to anything and helps building smart data through intricate models for representing information. To help advance the semantic world Ontotext combines a semantic graph database with text mining, transforming how organizations identify meaning across diverse databases and massive amounts of unstructured data.

SiteGround is one of the leading web hosting companies worldwide. Founded in Bulgaria in 2004, today the team consists of over 500 individuals based in Sofia, Plovdiv, Stara Zagora, Spain and Italy. SiteGround hosts over 2 million domains in five data centers on three continents. What sets them apart is their innovative approach to web hosting software and technology. SiteGround remains one of the very few companies of that scale to continuously develop their software stack and infrastructure entirely in-house. The fact that the company holds the team as its own most precious resource and empowers each team member to have a direct impact on the company operations and development is one of the reasons for their strong team spirit and motivation for over 15 years now.


Paysafe is a leading global provider of end-to-end payment solutions. Its core purpose is to enable businesses and consumers to connect and transact seamlessly through industry-leading capabilities in payment processing, digital wallet, card issuing and online cash solutions. 
With over 20 years of online payment experience, an annualized transactional volume of over US $85 billion, and approximately 3,000 employees located in 12+ global locations, Paysafe connects businesses and consumers across 200 payment types in over 40 currencies around the world.
In Bulgaria the most recognizable products of the company are Skrill, NETELLER and paysafecard. Skrill and NETELLER digital wallets allow users around the world to deposit, withdraw and transfer cash in different currencies, pay online, use a prepaid Mastercard and even buy and sell cryptocurrencies.


SAP company works with over 437 000 customers in more than 180 countries and has more than 98 000 employees from 140 countries. Established 19 years ago, the development center SAP Labs Bulgaria is one of the key subsidiaries of SAP SE. In the company currently work more than 930 professionals and more than 75% of the teams are working on cloud topics. SAP Labs Bulgaria has a key role for the defining and developing SAP Cloud Platform.

StorPool is a Bulgarian software-defined storage vendor. The storage solution they develop is used by service providers, SaaS companies, Enterprises, MSPs, hosting and cloud providers. The company believes that storing data should be simpler, cheaper and more efficient.
StorPool is among the few Bulgarian companies grown from a startup to a successful global storage vendor. Established in 2011, they have developed an innovative storage software and now sell it on the global market. Its team believes that a successful company and product, come as a result of the efforts of extraordinary people!