Milen DyankovThe Liferay Advocate

Milen is senior consultant at Liferay helping some of the biggest European companies succeed in today's rapidly changing virtual reality by engaging their customers, partners, and employees. Before joining Liferay in 2012 he spent over 10 years designing and developing Java EE solutions for leading Polish companies (mostly in the finance and telecommunications industry). His main areas of competence include corporate portals, modular systems, e-commerce, enterprise application integration, web applications for mobile devices and many more!

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David DelabasseeThe Fn Guy

David is a Software Evangelist working for Oracle; his primary focus is Java on the Server-Side, i.e. Java Enterprise Edition. Prior to Oracle, David spent a decade at Sun Microsystems focusing on Java end-to-end (from the smart card to the high end server), related technologies and developer tools. In his various roles, David has been involved in numerous Java projects since the early days of this technology. David lives in Belgium. In his spare time, he enjoys playing video games with his daughter and tinkering with technologies such as Java, Home Automation, Electronics and Pinballs. You can find him on Twitter under @delabassee.

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Philipp KrennThe Elastic Advocate

Philipp is a Developer Advocate at Elastic, spreading the love and knowledge of full-text search, analytics, and real-time data. He is a frequent speaker at conferences and meetups about all things search & analytics, databases, cloud computing, and devops. Philipp lives in Vienna where he enjoys experimenting with software, organizing meetups, and sports.

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Simon RitterThe Java Speaker

Simon Ritter is the Deputy CTO of Azul Systems. Simon has been in the IT business since 1984 and holds a Bachelor of Science degree in Physics from Brunel University in the U.K. Originally working in the area of UNIX development for AT&T UNIX System Labs and then Novell, Simon moved to Sun in 1996. At this time, he started working with Java technology and has spent time working both in Java development and consultancy. Having moved to Oracle as part of the Sun acquisition, he managed the Java Evangelism team for the core Java platform, Java for client applications and embedded Java. Now at Azul, he continues to help people understand Java as well as Azul’s JVM technologies and products.

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Ondro MihalyiThe Payara Guy

Ondro 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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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 kgolev.com.

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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 - http://www.dirigible.io

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Sebastian GauderThe Kafka Expert

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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Heinz KabutzThe Java Specialist

Dr Heinz Kabutz writes the popular "The Java Specialists' Newsletter" read by tens of thousands of enthusiastic fans in over 145 countries. To sign up, visit http://www.javaspecialists.eu

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Vlad MihalceaThe Hibernate Guy

Vlad Mihalcea is the CEO of Hypersistence, and he also works as a Developer Advocate for the Hibernate project. He is passionate about enterprise systems, data access frameworks, and distributed systems. He wrote hundreds of articles about Hibernate on vladmihalcea.com, and he has a gold badge for the Hibernate, Java, and JPA tags on StackOverflow. He's also the author of "High-Performance Java Persistence" (https://leanpub.com/high-performance-java-persistence).

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Oleh DokukaThe Reactor Guy

A passionate Software Engineer with more than seven years experience in Software Engineering in different areas. During the last years has actively been working on the development of Enterprise Software and Distributed Systems, especially using Spring Stack. From the very beginning of Spring 5 development, the Speaker has been keeping his hand on the pulse of the framework's evolution and has already given a few inspiring speech about Spring 5, Reactive Programming in Spring 5 and Project Reactor. Currently, the speaker is authoring the book "Reactive Programming with Spring 5"

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Marcus BielThe Craftsman

Marcus Biel (@MarcusBiel) is a Software Craftsman, a Clean Code Evangelist and Java influencer. Since 2001, Marcus has worked as a developer and architect on many different Java related projects, mostly in the finance and telecommunications industries. Right now he is working on https://join.cleancodeacademy.com/, an online platform dedicated to teaching aspiring Java Craftsmen.

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Michał MatłokaThe Machine Learning Guy

Through his career Michał worked with C, Java, forgotten lands of Java EE, Spring, Scala and Big data. He committed a crime of writing a Java EE book, which may hunt him for the rest of his life. He is an open source contributor and a winner of the JBoss Community Recognition Award in 2013 for his contributions to ShrinkWrap. He is currently one of the 40 CEOs at SoftwareMill, a fully distributed company with no main office and a completely flat organization structure. He presented on GeeCON Kraków & Prague, Devoxx Poland, JDD, Confitura, Voxxed Days Bucharest, JBCNConf and other events.

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Ionut BalosinThe Luxoft Architect

Software Architect @ Luxoft with 10+ years of experience in a wide variety of business applications. Particularly interested in software architecture and performance & tuning topics. Regular speaker at external conferences (e.g. GeeCon, JokerConf, XP Days, Voxxed, Bucharest Java User Group, Logeek, SoftLabs, DevTalks, Agile Tour) and occasionally technical writer (InfoQ, DZone, etc).

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David PilatoThe Elastic Guy

David is Developer and Evangelist at elastic and French spoken language User Group creator. In his free time, he likes talking about elasticsearch in conferences or in companies (Brown Bag Lunches).

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Sergey MorenetsThe Docker Guy

I am Java developer, trainer and technical writer with more than 17 years of experience. I am co-founder of programming courses IT-Discovery and educational portal IT-Simulator. I am author of several popular books about Java development: "Developing Java applications"(part 1 and 2),"Basic errors in Java programming" and "Ideal code" I am also regular speaker at Ukrainian and internation conferences (JEEConf, Java Day, Devoxx Poland).

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Volker SimonisThe SAP Machine Guy

Volker Simonis works in SAP JVM Technology group. He is an OpenJDK contributor from the very beginning and helped SAP to engage in the OpenJDK project. He's the project lead of the OpenJDK PowerPC/AIX and s390x porting projects, a JDK reviewer and JCP Executive Committee representative for SAP. He's also a member of the JCP JSR 379 (Java SE 9), JSR 383 (Java SE 10) and JSR 384 (Java SE 11) Expert Groups.

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Kirk PepperdineThe Performance Expert

Kirk is a co-founder of jClarity, a company building the next generation of application diagnostic tooling. He is the author of the original Java Performance Tuning workshop, He authors articles and speaks frequently about Java and performance. Kirk has been a Java Champion since 2006 being recognized for his work in performance tuning.

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Drazen NikolicThe Reactive Guy

Drazen Nikolic has 17 years of experience developing Java enterprise applications. He has worked in various domains like e-commerce, insurance, digital marketing, social apps etc. Spring Certified Professional. Alongside working on client projects, he regularly prepares and executes various internal technical presentations and workshops. So far talked at Code Camp, Iasi, Romania, StartIT Fest, Belgrade, Serbia conferences, as well as at Seavus Code Talks events.

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Harald MeyerThe IoT Guy

Harald is a Senior Principal Consultant and the IoT Lead Architect with Software AG. For the last 10 years, he has been advising Fortune 500 companies on digital transformation projects using Software AG's Digital Business Platform.

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Lachezar BalevThe Monitoring Guy

I am a software engineer with 18 years experience in various projects. I met java in 2000 in the form of J2SE 1.2. But my hello world "application" was written in BASIC long before. Currently I work at REWE Digital Bulgaria on an exciting Microservice oriented architecture. I love to experiment, peek under the hood of popular open source frameworks and build usable and reliable software. You can meet me at Stack Overflow, GitHub, and numerous smaller online communities. In my free time I love cruising with my bike around the country (but I never leave my laptop behind).

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Ansgar BraunerThe Kafka Expert

Ansgar Brauner is working at REWE Digital as Software Architect, taking care of the Domain Fulfillment. After working at Zalando he started at REWE Digital in 2014 to help one of Europe’s biggest food retailers building the leading food eCommerce platform in Europe. Beside enabling 15 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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Sebastien BlancThe Keycloak Lead

Sébastien Blanc is Principal Software Engineer and works for Red Hat. He is currently part of the Keycloak team and loves to travel the world to advocate about his favorite tools and projects.

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Yordan PavlovThe Dirigible Guy

Yordan Pavlov is Senior Developer at SAP Labs Bulgaria. He has 5+ years experience in Cloud Computing technologies. Currently he is focused on OpenStack and Kubernetes frameworks for building enterprise grade Cloud Platform at SAP. He is co-lead of Eclipse Dirigible project with many contributions in all the areas - WebIDE, AppServer, Templates, Enterprise JavaScript, etc.

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Ray TsangWho said Kubernetes?

Ray is a Developer Advocate for the Google Cloud Platform. Ray had extensive hands on cross-industry enterprise systems integration delivery and management experiences since 2002. Ray has built mobile applications & micropayment systems as an independent contractor. During his time in Taiwan, Ray has built IT systems for Taiwanese government for a large scale search engine, electronic customs record management, and more. At Accenture, Ray was a team lead for a SOA deployment at a utilities company, building out common frameworks for messaging and service tracing. Moreover, Ray was an architect leading teams to implement online booking channels for a global hospitality company. During Ray's time at Red Hat, he was specialized in Java middleware, and contributing to open source projects such as Infinispan. Aside from technology, Ray enjoys traveling and adventures. Ray is currently a Developer Advocate at Google. Follow Ray on Twitter @saturnism (https://twitter.com/saturnism)

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Ianislav TrendafilovThe VMware Guy

Ianislav Trendafilov is Staff Engineer at VMware. He has 16+ years of experience in IT industry - software and hardware project development, datacenter operations and architecture, telecom networks and IoT tinkering.

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Plamena VanevaThe Security Expert

Senior security expert and certified ethical hacker at the Global architecture team at Experian DA with more than 10 years of experience in the security domain. Starting from application security - design, development, and integration of security services in software products, now with main focus on exploitation techniques covering different layers of the vulnerability stack, vulnerability management, doing internal ethical hacking and security awareness workshops.

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Violeta GeorgievaThe Tomcat Committer

Violeta has more than 15 years of experience with Web containers and applications. She is a committer in several open source projects. In 2013 she became an Apache Tomcat committer. She has been working at Pivotal for the last two years, focusing on Reactor Netty, Servlet 3.1/Reactive Streams bridge, reactive WebSocket client and server, and WebFlux performance.

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Oleg ŠelajevThe GraalVM Advocate

Oleg Šelajev is a developer advocate for the Graal project at Oracle Labs, which aims to make programs run faster and developers more productive. He helps to organize VirtualJUG, the online Java User Group, and a GDG chapter in Tartu, Estonia. In his spare time, he is pursuing a Ph.D. in dynamic system updates and code evolution. Previously, Oleg was a part-time lecturer at the University of Tartu and since then enjoys speaking, teaching, and participating in software conferences all over the world. Loves pizza and playing chess. Favorite languages: Java, JavaScript, and Clojure. Java Champions alumni.

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David BlevinsThe Triber

Founder of Tomitribe, veteran of Open Source Java EE in both implementing and defining JavaEE specifications for over 15 years with a strong drive to see JavaEE simple, testable and as light as Java SE. Co-Founder of OpenEJB (1999), Geronimo (2003), TomEE (2011). Member of the Eclipse MicroProfile, Jakarta EE PMC, JCP Executive Committee, Java EE 8 Expert Group, past member of the Java EE 7, EJB 3.2, and EJB 3.0 Expert Groups. Contributing author to Component-Based Software Engineering: Putting the Pieces Together from Addison Wesley.

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Venkat SubramaniamJust Venkat

Dr. Venkat Subramaniam is an award-winning author, founder of Agile Developer, Inc., creator of agilelearner.com, and an instructional professor at the University of Houston. He has trained and mentored thousands of software developers in the US, Canada, Europe, and Asia, and is a regularly-invited speaker at several international conferences. Venkat helps his clients effectively apply and succeed with sustainable agile practices on their software projects. Venkat is a (co)author of multiple technical books, including the 2007 Jolt Productivity award winning book Practices of an Agile Developer. You can find a list of his books at agiledeveloper.com. You can reach him by email at venkats@agiledeveloper.com or on twitter at @venkat_s.

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Simon MapleThe vJUG Founder

Simon is the Director of Developer Relations at Snyk, 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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