Simon Maple (2018)

Simon MapleThe vJUG Guy

Simon is the Director of Developer Relations at ZeroTurnaround, a Java Champion since 2014, JavaOne Rockstar speaker in 2014, Duke’s Choice award winner, Virtual JUG founder and organiser, London Java Community co-leader and RebelLabs author. He is an experienced speaker, having presented at JavaOne, JavaZone, Jfokus, DevoxxUK, DevoxxFR, JavaLand, JMaghreb and many more including many JUG tours. His passion is around user groups and communities. When not traveling, Simon enjoys spending quality time with his family, cooking and eating great food.

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Heather VanCura (2017)

Heather VanCuraThe JCP Chair

Heather VanCura leads the JCP Program at Oracle, and is a leader of the global community driven adoption and user group programs. Heather drives the efforts to transform the JCP program and broaden participation and diversity in the community. She is passionate about Java, women in technology and developer communities, serving as an international speaker and community organizer of developer hack days around the world. Heather enjoys speaking at conferences, such as OSCON, Devoxx, JFokus, and the JavaOne Conferences. She resides in the San Francisco Bay Area, California USA and enjoys trying new sports and fitness activities in her free time.

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Kiril Stefanov (2017)

Kiril StefanovThe MongoDB Guy

I am software engineer with more than 13 years experience in Java Enterprise application development. I have been teaching Java EE courses in various IT academies and software companies where I built strong teams of Java professionals. In the last 6 years, I am working at VMware as Technical lead responsible for XaaS features of VMware's vRealize Cloud Automation software.

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Kalin Maldzhanski (2017)

Kalin MaldzhanskiThe Reactive Guy

Developer&Maker who loves technology, automation, optimization and confrontation. Hobbies DIY, Open Source, Open Data. I have been involved in development since windows 3.11 and mobile development since the days of Pocket PC 2002 and doing cool stuff since. IoT&DIY enthusiast, Open Data Advocate, Open Source contributor, freelance consultant @AppTik, Co-Founder @Linked.Farm, Big Fan of Rakia.

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Frédéric Hubin (2017)

Frédéric HubinThe Smart Contracts Guy

Frédéric has more than 20 years of experience in programming. He started programming in Java in 1996 while still in College. In 1998, he joined the Swiss Java Center in Zuerich and has been working for Sun Microsystems for a couple of years. Since then, Frédéric has been working for major banks in Europe and currently holds a position as a Senior Java Architect at the financial markets department of ING in Brussels. Frédéric is a blockchain enthusiast and is also working on the concrete application of the blockchain technologies to derivative instruments.

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Kostadin Golev (2017)

Kostadin GolevThe JUnit Guy

Kostadin is experienced Java Developer and team leader with strong interest in test automation. Always on a quest of continuous improvement, Kostadin believes small efforts over time quickly add up. When not busy with work and family, he likes to write and share his experiences at

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Sebastian Gauder (2017)

Sebastian GauderThe REWE Architect

Sebastian Gauder is working at REWE Digital as Software Architect, taking care of the bounded context Site landing. After working at Adobe they he started at REWE Digital to help one of Europe’s biggest food retailers (REWE, Penny, Billa) building the leading food eCommerce platform in Germany. Beside enabling 4 teams to work autonomously he helps the product owners to not neglect the technical view. Sebastian spends his spare time playing inline hockey.

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Ansgar Brauner (2017)

Ansgar BraunerThe REWE Architect

Ansgar Brauner is working at REWE Digital as Software Architect, taking care of the bounded context Fulfillment. After working at Zalando he started at REWE Digital to help one of Europe’s biggest food retailers (REWE, Penny, Billa) building the leading food eCommerce platform in Europe. Beside enabling 6 teams to work autonomously he helps the product owners to not neglect the technical view. Ansgar leads the Java User Group Dortmund and likes playing around with Microcontrollers.

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Stefan Minev (2017)

Stefan MinevThe Fibers Guy

Stefan is a Senior Software Engineer at Paysafe. He is primarily working on Java backend applications in one of the payments related teams in the company. He likes to experiment with different programming languages and technologies and is a strong believer that the “Clean Code” is the best way to build quality software.

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Mike Fulke (2017)

Mike FulkeThe RBS Guy

Mike is a platform architect at RBS with more than 20 years’ experience in Financial Services technology. His expertise covers risk management and electronic trading systems for Fixed Income markets using Java, C++ and C#.

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Julien Simon (2017)

Julien SimonThe AWS Guy

Julien Simon, Principal Technical Evangelist at Amazon Web Services. Before joining AWS, Julien served for 10 years as CTO/VP Engineering in top-tier web startups. Thus, he’s particularly interested in all things architecture, deployment, performance, scalability and data. As a Principal Technical Evangelist, Julien speaks very frequently at conferences and technical workshops, where he meets developers and enterprises to help them bring their ideas to life thanks to the Amazon Web Services infrastructure.

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Nedelcho Delchev (2017)

Nedelcho DelchevThe Dirigible Guy

Nedelcho Delchev is Development Architect at SAP Labs Bulgaria in Development Experience & Research for SAP Cloud Platform. He has 14+ years of experience in various programming languages, technologies and architectural styles. Based on the lessons learnt from the past Java EE and SOA times, along with a group of a few colleagues he started SAP's internal innovation project targeting a new approach for Cloud Development. The project name is Dirigible. It focuses on the simplest yet common use-cases and provides full-fledged capabilities for developing, running and operating cloud applications -

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Vladimir Pavlov (2017)

Vladimir PavlovThe Java EE Guy

Technical Product Manager/Architect with the SAP Cloud Platform team. 17+ years of experience with enterprise architectures, distributed systems, middleware, messaging, persistence technologies, etc. Current activities in the area of Java EE, Application Programming Models, Cloud, Dev Tools/Experience. Member of the Java EE 6 Expert Group. Regular speaker at international and regional conferences, like JavaOne, EclipseCon, SAP TechEd, Eclipse DemoCamps, Java2Days, CEE-SECR, ISTACon, etc. Mentor and coach at several developer hackathons, like HackZurich, GITEX AppHack, SAP InnoJam, Logistics of the Future, ESA Space App Camp, etc.

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Nakul Mishra (2017)

Nakul MishraThe Tracing Guy

Consultant around JVM and related technologies. Prefers automation over manual configurations. Keen on continuous delivery, unit testing and code simplicity. Interested in developing applications that requires creativity, imagination, fast-learning and zest for putting theory into code.

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Ondrej Mihalyi (2017)

Ondrej MihalyiThe Payara Guy

Ondrej is a software developer and consultant specializing in combining standard and proven tools to solve new and challenging problems. He's been developing in Java and Java EE for 9 years. As a Scrum Master and experienced Java EE developer, he's helped companies to build and educate their development teams, improve their development processes and be flexible and successful in meeting client requirements. He loves working with Java EE community and would welcome anyone to contribute to Payara, as well as to any other opensource project in the Java EE ecosystem.

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Victor Rentea (2017)

Victor RenteaThe Clean Code Guy

Java Craftsman. Sr. Engineer & Technical Lead at IBM Romania. Independent Trainer & Coach. I worked hard on backend systems over the last 10 years, solving technical challenges of a broad range of enterprise Java applications as a developer, lead and consultant. 4 years ago, after I had devoured Uncle Bob’s Clean Code book, I joined the ‘coding craftsmanship’ move. Of course, soon after I started preaching about it as an independent trainer/coach. This Clean Code, TDD, Pair Programming stuff it’s just too fun too keep it for oneself. For hundreds of days I’ve spread the word to more than 1000 trainees in all kinds of settings (even faculty lectures), usually bundled together with other training modules that I’ve gradually developed, such as Spring, JavaEE, JPA, Design Patterns, and the like. You can find the entire curricula on my website. My extensive experience as a trainer allowed me to refine a very entertaining presentation style, spiced with jokes, non-IT-world analogies, and examples that is able to make any developer profile understand even the most advanced design discussions. Recently however, I realized how much I enjoy meeting smarter people, so I’ve started talking at international conferences such as Devoxx MA and VoxxedDays Bucharest and Belgrade, and I am so enthusiast about meeting you guys, too !

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Daniela Kolarova (2017)

Daniela KolarovaThe FSM Master

Daniela is a software architect at CSC with more than 13 years experience with Java. She has worked on many international projects using Core Java, Java EE, Spring. Currently she is working in the banking domain and financial software having the opportunity to analyse complex architectures and aiming to find clean and elegant solutions. Because of her interests in AI she worked on scientific projects in the past and did some talks on AI conferences. Linkedin:

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Roberto Cortez (2017)

Roberto CortezThe Book Club Guy

My name is Roberto Cortez and I was born in Venezuela, but I have spent most of my life in Coimbra – Portugal, where I currently live. I am a professional Java Developer working in the software development industry, with more than 8 years of experience in business areas like Finance, Insurance and Government. I have finished my degree in Informatics Engineering (equivalent to the Bologna Master’s degree) from the Department of Informatics Engineering of the University of Coimbra in 2006, however I started to learn and enjoy Java in 1998. I work with many Java based technologies like JavaEE, Spring, Hibernate, GWT, JBoss AS and Maven just to name a few, always relying on my favorite IDE: IntelliJ IDEA. As a Freelancer / Independent Contractor I travelled around the world (an old dream) to customers, but also to attend Java conferences. The direct contact with the Java community made me want to become an active member in the community itself. For that reason, I have created the Coimbra Java User Group, started to contribute to Open Source on Github and launched this blog, so I can share some of the knowledge that I gained over the years. I hope you find it useful! Currently, I’m working with Tomitribe. After working for a few major corporations, I’m eager to help and grow something from the ground up. I’m very excited to work with all the amazing tribers working hard to make TomEE a compelling Java EE server.

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Christoph Engelbert (2017)

Christoph EngelbertThe JCache guy
Christoph Engelbert is Manager of Developer Relations at Hazelcast. He is a passionate Java developer with a deep commitment for Open Source software. He mostly is interested in Performance Optimizations and understanding the internals of the JVM and the Garbage Collector. He loves to bring software to it's limits by looking into profilers and finding problems inside of the codebase.
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Jose Paumard (2017)

Jose PaumardThe Streams guy
José is an assistant professor at the Institut Galilée (Université Paris 13), PhD in applied mathematics from the ENS de Cachan. He has also worked as one of the lead members of the Paris JUG for 6 years, and is a co-founder of Devoxx France. As a member of the CDI 2.0 Expert Group, he has contributed new ways of handling events, especially in the asynchronous part of the spec. He provided new patterns that have been adopted by the EG. José has been working as an independent programmer for 20 years and is a well-known Java / Java EE / software craftsmanship expert and trainer. His expertise includes Tomcat, JBoss, Weblogic, Websphere, Glassfish, and the most popular Java EE parts: JPA (Hibernate & Eclipselink), EJB (including version 2), JMS, JTA, the Web tier, and more. José speaks at conferences, including JavaOne and Devoxx; and writes technical articles for various publications including Java Magazine and Oracle Technology Network. Passionate about education, he publishes MOOC for several companies: Oracle Virtual Technology Summit, Pluralsight, Microsoft Virtual Academy and Voxxed.
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Heinz Kabutz (2017)

Heinz KabutzThe Multithreading Guy

Dr Heinz Kabutz is a Java guru who lives on the Island of Crete in Greece, where he has lots of Bulgarian friends. He is the author of The Java Specialists' Newsletter, a publication looking at advanced tips and tricks for the seasoned Java programmer. He also teaches advanced courses on Java concurrency, performance and design patterns.

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Alexey Fyodorov (2017)

Alexey FyodorovThe Guy
Conference Producer @ Group, Technology Evangelist @ Odnoklassniki Technology Evangelist @ Odnoklassniki. Worked for Oracle for 3 years (JCK Team, Java Platform group). Leader of (Russian Java User Group), organizer of largest Russian Java, JavaScript and .NET conferences. Java Champion. Interested in runtimes, multithreaded programming and software engineering trade-offs.
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Piotr Kafel (2016)

Piotr KafelThe Groupon guy

Software Engineer at Groupon. I wrote my first line of code in Java when I was 16 years old. Since then I have been working on projects for companies like Nokia, HP or Credit Suisse. Even though Java is my main programming language I'm trying not to limit myself to it. I love exploring new languages, technologies and approaches. I'm an open source contributor and ex Wroclaw JUG leader.

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Stoyan Rachev (2016)

Stoyan RachevThe Go guy

Stoyan has 18+ years professional experience in software development, as well as people and project management. He is currently a software architect at SAP focusing on software lifecycle management for the Cloud. Having used Java during most of his professional life, he recently encountered Go and has had quite some fun playing around with it since then. In the last several years, he has been speaking regularly at SAP internal and external events.

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