Autorengalerie

I am one of the co-founders of SoftwareMill, where I primarily code using Java, Scala, and other interesting technologies. I am actively involved in open-source projects, such as Ox, Tapir, sttp, Quicklens, ElasticMQ, and others. I have also been a speaker at major conferences, including JavaOne, Devoxx, GeeCON and ScalaDays.

Chapter Lead at AXA Konzern AG

Alex is a Senior Software Engineer, Lead Open Source Maintainer and Java Specialist at XDEV Software with a diverse background spanning many areas of software development. He has particular expertise in monitoring, security, privacy, integration testing, IDE development, Maven, Spring and Vaadin.

With over 25 years in the tech, Yuriy Bezsonov has progressed from a software developer to an engineering manager and Solutions Architect. Now, as a Senior Solutions Architect at AWS, he assists partners and customers in developing cloud solutions, focusing on container technologies, Kubernetes, Java, application modernization, SaaS, developer experience, and GenAI. Yuriy holds AWS and Kubernetes certifications, and he is a recipient of the AWS Golden Jacket and the CNCF Kubestronaut Blue Jacket.

Christian Grobmeier is an experienced Java developer, open-source advocate, and VP of Data Privacy at the Apache Software Foundation. He has contributed to key Apache projects, including Log4j, Commons, and Struts, and is actively involved in discussions around Java logging standards. As CEO of Grobmeier Solutions GmbH, he helps businesses build reliable, privacy-conscious software. Passionate about sustainable open-source practices and software security, he shares his insights at conferences, in publications, and through his writing on software ethics and leadership.

Christian Siebmanns is an expert in the development of enterprise web applications. He is passionate about user interfaces, because he is a strong believer that frontends should make people’s work easier, not harder.

Fachinformatiker für Anwendungsentwicklung bei der Deutschen Telekom. 2004 - 2010: Studium der Praktischen Informatik an der htw saar mit Abschluss Dipl-Inf. (FH) Seit 2011: Lehrkraft für besondere Aufgaben an der Hochschule für Technik und Wirtschaft des Saarlandes

Chiara is a tech communicator with over 10 years of experience in producing technical content on a variety of topic related to the digital transformation. Her expertise includes automation engineering, robotics, software engineering and network technology. She holds a PhD for ETH Zurich and a MSc from the University of Southampton.

Csilla Szántó is a professional software engineer specializing in web application development and data-driven solutions. She has worked in the industry and for consulting companies across various European countries, and brings experience in working for research and public service institutes. Her interests include inspiring AI and visualization projects, as well as engaging with software communities. In her free time, she enjoys hiking in the mountains.

Dmitry Chuyko ist OpenJDK-Committer, Artikelautor und Sprecher auf internationalen Konferenzen. Seine früheren Erfahrungen bei Unternehmen wie Oracle und der Deutschen Bank haben gezeigt, dass die interessantesten Anwendungsprobleme in Verbindung mit der zugrunde liegenden Plattform gelöst werden können. Dmitrys Schwerpunkt bei BellSoft liegt auf der Optimierung der JVM für x86 und ARM sowie der Entwicklung kleiner, schneller und sicherer JDK-Container.

Enrique Medina Montenegro is a Senior software architect and technical author specializing in Clean Architecture, Hexagonal Architecture, and Domain-Driven Design, with extensive experience building enterprise systems in Java and Spring.

Gaurav Gupta is a Senior Software Engineer at Payara and the creator of Jeddict, an innovative, open-source, AI-powered Jakarta EE application development platform. As an Apache NetBeans Committer and an Eclipse GlassFish Committer, Gaurav brings extensive expertise and dedication to advancing these key open-source tools. His focus on enhancing developer productivity and Jakarta EE standards through cutting-edge technologies highlights his commitment to the open-source ecosystem and his mission to empower developers worldwide.

Responsibility, pragmatism, domain knowledge and professionalism. These are the core values and attributes that characterize successful software architects. Based on many years of project experience, Holger Tiemeyer imparts these skills and knowledge in his training courses, speaks about them at conferences and at Universities and publishes articles in specialist magazines. As a computer scientist with a minor in psychology, he volunteers at iSAQB e.V.

Ingo Düppe is an IT consultant and founder of CROWDCODE. He advises in the field of architecture management and is responsible for the realization and conception of web, mobile and cloud applications. The challenge is to find the right combination of technologies, methods and tools to suit the individual context. As a coach, he supports teams in the use of Java EE and Spring technologies and their efficient integration into the individual software development process.

JAVAPRO is the world's first free print magazine for Java, now also available as a free eBook. JAVAPRO is a project of the Java community for the Java community. At JAVAPRO, renowned authors and speakers from the international Java community write about the latest developments in Java, trends, tools, and best practices for professional application development with Java. In addition to articles, we regularly publish webinars, training sessions and videos on YouTube – for developers who want to share their expertise as well as for those looking to deepen their technical skills. Contributions from the community are always welcome – becoming an author is easy via javapro.io/become-an-author. JAVAPRO was founded in 2017 as a free print and online magazine in Germany. Today, we reach developers worldwide through javapro.io and actively support the community as the organizer of the Java conference JCON.

Experienced Software Engineer with a demonstrated history of working in the computer software industry. Skilled in Software Crafting, Java, Python and SQL

Senior Software Engineer at XDEV Software GmbH. As a grateful father of three and a Java developer, I love diving into open-source projects. I'm all about Spring, Quarkus, EclipseStore, AWS, and Kubernetes. It's where I thrive, tinkering and finding ways to make things work better.

Julius Lauterbach is a Software Developer specializing primarily in Java backend development. Over the past few years, he has increasingly focused on blockchain development and has been working on integrating blockchain technologies into enterprise software solutions.

Julius Mischok is founder and CEO of Mischok GmbH. Together with his consulting team, he empowers project partners to implement complex software solutions.

Marián Varga is a co-author of the upcoming book Mastering RESTful web services with Java. He is building a community focusing on integration at love2integrate.com

Marin Niehues is Chief Strategy Officer at PLOIN GmbH and advises companies on how to combine strategy and working methods in a meaningful way. He shows how to achieve real success with a clear focus and solid structures.

Marius Stein is a freelance IT consultant and cloud engineer. He has many years of experience in advising companies on building cloud platforms and developing cloud-native systems. Additionally, he is a member of the program committee of the Cloudland Festival and co-organizer of the Cloud Native Computing Rheinland Meetup group.

Martin Toshev is a solution architect and IT consultant conducting professional trainings for novice and experienced developers. He is a Java enthusiast and one of the leads of the Bulgarian Java User group (BG JUG) where he is one of the organizers of jPrime conference.

Solutions Architect at PAYONE GmbH / a Woldline Company, FinTech, Payments, Speaker, Writing Blogposts, OpenSource, Husband & Father / Family, Cooking

Merlin is a Software Engineer, Architect and Oracle ACE with over 10 years of experience in different domains and languages. His main focus is Java Enterprise Applications with modern and Next-Generation Java. As a Migration Engineer, he helps teams and individuals utilize new features and supports them in migrating. Besides developing, speaking at conferences and his parental role, he tries to participate in community events, teach folk to land gliders (yes, I am a Flight Instructor!) and play volleyball.

Nina Nitzsche is an Agile Consultant and previous developer based in Berlin, with over 10 years of experience in agile software development. Passionate about fostering team collaboration, driving continuous improvement and empowering teams to achieve their full potential through agile methodologies.

René Schwietzke is a seasoned IT professional with over two decades of experience in performance tuning and performance measurements, having started his journey with Java version 1.0. During his tenure at various e-commerce and quality assurance companies, he honed his expertise in optimizing and fine-tuning large-scale applications. His academic background includes a Master's degree in Computer Science, and he actively shares his knowledge by giving lectures at universities and presenting at international software development conferences. He is also a sought-after speaker for training sessions on Java, garbage collection, memory management, quality assurance, and testing.

Richard Fichtner is the Principal Software Architect at XDEV Software GmbH, with over 20 years of experience in the software industry. He works at the intersection of business and technology, contributing to the open-source community through projects like RapidClipse (https://www.rapidclipse.com) and advocating for best practices in Apache Maven. Richard is passionate about sharing knowledge on Java technologies, making him a frequent conference speaker. He leads the Java User Group Oberpfalz, co-organizes the JCON conferences (https://jcon.one), and has been recognized as a Java Champion, Oracle ACE Pro, IBM Champion and Vaadin Champion. With a Master of Science in Applied Computer Science, his expertise spans Java, clean code, cloud technologies, and pragmatic development practices, focusing on improving developer productivity through cloud solutions. Richard enjoys relaxing by a campfire and listening to/playing country music in his spare time.

Richard Gross is the head of software archeology at MaibornWolff. He drives forward topics such as software modernisation and technical excellence. As a team lead and architect, he helps teams to achieve a return on investment as early and continuously as possible. To achieve this, he coaches teams in code quality, test automation and collective ownership. His technical focus is on hexagonal architectures, TestDSLs, hypermedia APIs and the expressive and unambiguous modelling of the domain as code. Richard shares his knowledge through active pair programming, as well as training, technical articles and presentations at international conferences. He has also long been involved in the open source project CodeCharta, which enables non-developers to gain an understanding of the quality of their software.

Sascha Möllering is a Principal Specialist Solutions Architect for Containers at AWS, where he has been helping customers architect and optimize their cloud-native applications for nearly a decade. With a deep passion for container technologies, serverless computing, and Java development, he works with organizations across the globe to design and implement scalable, resilient solutions on AWS. A regular speaker at industry conferences and technical events, Sascha shares his expertise through hands-on workshops, blog posts, and technical content. His practical experience and technical depth have made him a trusted voice in the cloud-native community. He is particularly known for his work in containerization strategies and Java application modernization on AWS. When not architecting solutions or speaking at events, Sascha actively contributes to the technical community through writing, mentoring, and developing educational content that helps organizations navigate their cloud transform

Sascha Selzer works as Principal Engineer at OpenValue Düsseldorf GmbH. He has many years of experience in development with JVM-based languages and in software architecture. His current focus is on the design and implementation of backend architectures, as well as continuous delivery/deployment strategies. He also deals with cloud topics such as monitoring and tracing solutions as well as related architecture and development paradigms (microservices, devops).

Sebastian Hempel is a self employed consultant and trainer from the north of Bavaria. Since 2003 he supports customers in developing and operating enterprise systems. His main focus lays in the development of systems in Java (JakartaEE and Quarkus) on Linux based systems.

Sven Reinck has been programming since childhood and has spent more than twenty years working with software architecture, programming languages, and the question of how developers can understand complex systems. He studied Technical Informatics and Computer Science and has been working for many years as a freelance software developer and IT trainer in the Go and Java ecosystems. A particular focus of his work lies in the visualization of mental software models: ranging from the development of game engines and the labeling of road networks in navigation software, to educational software for programming beginners, and tools for analyzing and visualizing structures in XML Schema. He is currently exploring interactive visualizations of structures and dependencies to make architectural understanding more tangible in everyday software development.

Sven Ruppert entwickelt seit 1996 in Java an Industrieprojekten. Er war über 15 Jahre als Berater weltweit in Branchen wie Automobil, Raumfahrt, Versicherungen, Bankwesen, UNO und WorldBank tätig. Sven ist Groundbreaker Ambassador (ehem. Oracle Developer Champion) und arbeitete als Developer-Advocate für JFrog und Vaadin. Er spricht regelmäßig auf Konferenzen weltweit und schreibt für IT-Zeitschriften sowie Tech-Portalen.

Principal Solutions Engineer at VMware Tanzu by Broadcom with over a decade of experience in modern applications, DevSecOps, and AI.

Vadym Kazulkin is AWS Serverless Hero and Head of Development at ip.labs GmbH, a 100% subsidiary of the FUJIFILM Group, based in Bonn. ip.labs is the world's leading white label e-commerce software imaging company. Vadym has been involved with the Java ecosystem for over twenty years. His focus and interests currently include the design and implementation of highly scalable and available applications in AWS Cloud with the special passion for Serverless. Vadym is also the co-organizer of the Java User Group Bonn meetup and a frequent speaker at various Meetups and conferences.

A passionate software engineer with over 20 years of experience and author of Software Architecture with Spring (Packt, 2025). Working with Java since 2001 and Spring since 2006, he holds Java and AWS certifications. He specializes in software architecture, microservices, and cloud-native systems, helping teams build scalable solutions while applying a philosophical lens to technical decision-making, constantly questioning the “why” behind each choice and its trade-offs. Wanderson holds a degree in Computer Science and MBAs from USP in Data Science and Software Engineering. He is currently preparing to pursue a master’s in Computer Science focused on Distributed Systems and Cloud Computing.

Werner is a Cloud Architect, Jakarta EE and Microservice expert. Helping Global 500 Enterprises across industries and leading IT vendors. He worked for over 30 years as IT Manager, PM, Coach, SW architect, developer and consultant for Finance, Mobile, Media, Transport and Public sector. Werner develops enterprise systems using Java, Java/Jakarta EE, Oracle, IBM, Spring or Microsoft technologies, JavaScript, Node, Angular, dynamic or functional languages. Besides working for major companies, he runs his own consultancy CATMedia and in his spare time, runs and supports open-source projects, writes song lyrics, novels, screenplays, technical books and articles. Werner is Committer at Apache Foundation, Eclipse Foundation, Babel Language Champion, UOMo Project Lead and active member of the Java Community Process in JSRs like 321 (Trusted Java), 344 (JSF 2.2), 354 (Money, also Maintenance Lead), 358/364 (JCP.next), 362 (Portlet 3), 363 (Unit-API 1), 365 (CDI 2), 366 (Java EE 8), 375 (Java EE Security), 380 (Bean Validation 2), 385 (Unit-API 2, also Spec Lead) and was the longest serving Individual Member of the Executive Committee for 9 years in a row till 2017. Since its inception, Werner has been the Committer representative in the Jakarta EE Specification Committee.

Wladi Mitzel is a Solutions Architect at Pulumi, where he works with engineering organizations to adopt infrastructure as code, build internal developer platforms, and structure their teams around cloud-native practices. He spent over a decade as a Java developer, building enterprise systems in Java EE and Spring Boot before taking on DevOps and platform engineering responsibilities during a large-scale cloud migration. That experience, seeing firsthand how infrastructure decisions affect developer velocity, led him into cloud architecture. He went on to spend four years at AWS as a Solutions Architect, specializing in containers and Kubernetes and guiding large enterprises through cloud transformations. He later joined Alibaba Cloud, advising on cloud architecture, AI workloads, and compliance in regulated environments. Across these roles, a recurring theme has been helping organizations close the gap between application development and infrastructure operations. He is based in Germany.