Oren Nakdimon is an Oracle ACE Director with 30+ years of extensive and continuous experience with Oracle-based systems, as a developer, DBA, manager and instructor. Oren gained lots of knowledge about databases in general, and Oracle in particular, and likes sharing it - by blogging, tweeting, presenting in local and international conferences, and more.
He is the database architect of Moovit, where he has been working since 2012.

Oren Nakdimon is an Oracle ACE Director with 30+ years of extensive and continuous experience with Oracle-based systems, as a developer, DBA, manager and instructor. Oren gained lots of knowledge about databases in general, and Oracle in particular, ... Show more

Brian Vermeer is a Staff Developer Advocate at Snyk and a respected authority in Java and secure software development. He is an internationally recognized Java Champion and Oracle ACE Pro, honored for his outstanding contributions to Java and open source advocacy.
With over 15 years of hands-on software engineering experience, Brian specializes in Java, cybersecurity, and AI. He has authored numerous articles on this and has contributed to a wide range of open source projects within the ecosystem.
Brian is an active developer community leader, serving as a JUG leader for both the NLJUG and VirtualJUG, co-leading DevSecCon, and conference organizer for J-Fall and J-Spring. He is also a frequent speaker at leading international conferences, including JavaOne, Devoxx, and Devnexus.
Beyond his professional work in technology, Brian serves as a reservist in the Royal Netherlands Air Force in the rank of Captain and is a Taekwondo Master and instructor.

Brian Vermeer is a Staff Developer Advocate at Snyk and a respected authority in Java and secure software development. He is an internationally recognized Java Champion and Oracle ACE Pro, honored for his outstanding contributions to Java and open so... Show more

Gary Gordhamer has dedicated his professional career to exploring the enterprise application landscape and the digitization of business processes. Over the past three decades, he has gained extensive technical expertise in Oracle database, e-Business suite, middleware, and related technologies. His professional background encompasses a diverse range of industries, including healthcare, finance, manufacturing, utilities, and government. Gary is an Oracle ACE Director and is a frequent presenter at Oracle Conferences. Additionally, he is the author of “Oracle Database Performance Tuning: Pocket Solution Guide Series For Upgrading Oracle Databases.”

Gary Gordhamer has dedicated his professional career to exploring the enterprise application landscape and the digitization of business processes. Over the past three decades, he has gained extensive technical expertise in Oracle database, e-Business... Show more

Simon Martinelli is a Java Champion, Vaadin Champion, and Oracle ACE Pro with over three decades of experience as a software architect, developer, consultant, and trainer. He is the creator of the AI Unified Process (AIUP) and a strong advocate of Spec-Driven Development.

As the owner of Martinelli LLC, he coaches teams to get up to speed with AI-driven development. He regularly shares his insights through international conferences, articles, and his blog, Keep IT Simple (https://martinelli.ch), where he writes about AI, architecture, and modern Java development.

He is also a lecturer at three universities in Switzerland, where he teaches AI-driven software engineering, software architecture, persistence, DevOps, and cloud-native development.

Simon Martinelli is a Java Champion, Vaadin Champion, and Oracle ACE Pro with over three decades of experience as a software architect, developer, consultant, and trainer. He is the creator of the AI Unified Process (AIUP) and a strong advocate of Sp... Show more

Biju Thomas is an Oracle ACE Director (since 2015) and a Cloud Technical Solutions Expert leading Data Intensity’s Digital Transformation practice. With a background spanning software development and enterprise database architecture, he brings a practitioner’s perspective to building scalable, production-ready cloud solutions.

Biju specializes in modern data platforms, cloud migrations, and multicloud architectures, helping organizations integrate robust data foundations with hyperscaler ecosystems such as Microsoft Azure. A long-time community contributor and frequent speaker, he focuses on practical patterns that bridge enterprise data platforms with modern AI and application development.

Learn more at www.bijoos.com
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Biju Thomas is an Oracle ACE Director (since 2015) and a Cloud Technical Solutions Expert leading Data Intensity’s Digital Transformation practice. With a background spanning software development and enterprise database architecture, he brings a pr... Show more

Giliam Breems is a Senior Oracle APEX Consultant and Tech Lead at Qualogy with more than 20 years of experience in the Oracle Database (SQL and PLSQL) and is now-a-days specialised in Oracle APEX. He became an Oracle ACE member in 2023, has been a member of the APEX World committee (nlOUG), organizes meetups for the company and is a speaker on national and international conferences (APEX World, HrOUG, POUG, DOAG, Kscope, OUGN, APEX Connect, APEX Alpe Adria and the APEX Latinoamérica Tour).

Giliam Breems is a Senior Oracle APEX Consultant and Tech Lead at Qualogy with more than 20 years of experience in the Oracle Database (SQL and PLSQL) and is now-a-days specialised in Oracle APEX. He became an Oracle ACE member in 2023, has been a me... Show more

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 and is a strong advocate for best practices in modern Java development. Richard is passionate about sharing knowledge on Java technologies, making him a frequent and highly rated conference speaker.

He is the founder and leader of the Java User Group Oberpfalz and co-organizes the JCON conferences. JCON EUROPE brings together the worldwide Java community from more than 60 countries.
Richard 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, pragmatic development practices, and European data privacy, helping organizations build modern, maintainable software.

In his spare time, Richard enjoys relaxing by a campfire and listening to or playing country music.

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 and is a strong advocate for best practices in modern Java ... Show more

Neil has been working in IT since 1988 when he coded Assembler and Cobol on IBM Mainframes against both hierarchical (NoSQL-ish) and relational databases. He started using Oracle software in 1991. Neil is an Oracle ACE Director and a founding member of the MASH Program. He likes to drink strong smooth Italian coffee, good beer and better whisky, depending upon the time of day.

Neil has been working in IT since 1988 when he coded Assembler and Cobol on IBM Mainframes against both hierarchical (NoSQL-ish) and relational databases. He started using Oracle software in 1991. Neil is an Oracle ACE Director and a founding member ... Show more

Ivar Grimstad is the Jakarta EE Developer Advocate at Eclipse Foundation. He is a Norwegian Java Champion and JUG Leader based in Sweden.

Besides advocating the Jakarta EE technologies, Ivar is contributing to the Jakarta EE specifications as well as being the PMC Lead for Eclipse Enterprise for Java (EE4J). He is also one of the specification leads for Jakarta MVC and represents Eclipse Foundation on the JCP Executive Committee.

Ivar is also involved in a wide range of other open-source projects and communities. He is a frequent speaker at International developer conferences.

Ivar Grimstad is the Jakarta EE Developer Advocate at Eclipse Foundation. He is a Norwegian Java Champion and JUG Leader based in Sweden. Besides advocating the Jakarta EE technologies, Ivar is contributing to the Jakarta EE specifications as well... Show more

Patrick Baumgartner is a Java Champion, passionate software crafter, and technical agile coach at 42talents. He helps teams build elegant, simple, and robust solutions, specializing in cloud software with Java, the Spring ecosystem, and other open-source technologies.

Patrick is an active member of the Software Craft, Java, and Agile communities in Switzerland. As a trainer and coach, he focuses on making a real impact by sharing knowledge, experimenting, and fostering continuous improvement. He enjoys learning with and from others.

Patrick Baumgartner is a Java Champion, passionate software crafter, and technical agile coach at 42talents. He helps teams build elegant, simple, and robust solutions, specializing in cloud software with Java, the Spring ecosystem, and other open-so... Show more

Richard Martens has been involved in information technology for more than 20 years. He started as a web developer using the Oracle database as no more than data storage. Richard has been responsible for major European multilingual websites and has been working with the Oracle database since 2000. During those years, he developed himself using a multitude of technologies and specialised in PL/SQL and Oracle APEX. Richard has been working primarily with PLSQL and APEX since 2005. With APEX, he combines the things he loves most: the Oracle database and web technologies.

Richard Martens has been involved in information technology for more than 20 years. He started as a web developer using the Oracle database as no more than data storage. Richard has been responsible for major European multilingual websites and has be... Show more

Since 2015, Maarten has taken the stage over 70 times at 40+ events across 20 countries, inspiring audiences with his practical insights and passion for technology.

His experience spans:
* Community-driven events: local meetups and Java User Groups;
* Top-tier international conferences: including JavaOne, Devnexus, JavaZone, multiple Devoxx editions, and J-Fall;
* Private engagements: in-house company events and guest lectures at both primary and professional education institutions.

Beyond speaking, Maarten actively shapes the developer and speaking communities. He spent three years on the J-Fall Program Committee, and now mentors upcoming speakers through the NLJUG Speaker Mentoring Programme and Info Support’s internal Speaking Community.

Since 2015, Maarten has taken the stage over 70 times at 40+ events across 20 countries, inspiring audiences with his practical insights and passion for technology. His experience spans: * Community-driven events: local meetups and Java User Gro... Show more

Merlin is a Migration Engineer at Moderne and a certified flight instructor two roles with the same methodology: preparation over improvisation, checklists over hope, and a safe landing is always the goal.

With 13+ years in Java and enterprise architecture, he helps organizations turn large-scale code migrations from risky adventures into routine operations using OpenRewrite for reproducible, recipe-driven transformations across hundreds of repositories.

An Oracle ACE Associate and Javaland 2024 Top Speaker, Merlin has delivered 30+ talks at conferences including Devoxx, JFokus, OOP, and Javaland. He co-organizes JUG Dortmund and writes for JAVA PRO, Java Magazin, and Java Spektrum.

Merlin is a Migration Engineer at Moderne and a certified flight instructor two roles with the same methodology: preparation over improvisation, checklists over hope, and a safe landing is always the goal. With 13+ years in Java and enterprise arc... Show more

Kim Berg Hansen is a database developer from Middelfart in Denmark. Originally wanting to work with electronics, he almost coincidentally tried computer programming and discovered where his talent lay, as the programs he did worked well – unlike the electronics projects he soldered that often failed. After that experience he progressed from Commodore Basic on VIC-20 over Modula-2 and C at Odense University to Oracle SQL and PL/SQL, which last two languages he now has worked with extensively since the year 2000. His professional passion is to work with data inside the database utilizing the SQL language to the fullest to achieve the best application experience for the users.

Kim shares his experience and knowledge by writing the Practical Oracle SQL book, blogging, presenting at various Oracle User Group conferences, and being the SQL quizmaster at the Oracle Dev Gym. His motivation is when peers go "now I understand" after his explanations, or when end users "can't live without" his application coding. He is certified Oracle OCE in SQL as well as awarded Oracle ACE Director. Outside the coding world Kim is married, loves to cook, and is a card-carrying member of Danish Beer Enthusiasts association.

Kim Berg Hansen is a database developer from Middelfart in Denmark. Originally wanting to work with electronics, he almost coincidentally tried computer programming and discovered where his talent lay, as the programs he did worked well – unlike the ... Show more

Ambili is a Principal Consultant in Analytics with Rittman Mead Consulting LTD with an industry experience of around 19 years. Her special focus is on Oracle Analytics, Oracle Digital Assistant, Oracle Database, Big Data and Graph DB primarily. Ambili is a passionate trainer who has trained many batches in Oracle DB development, Oracle Big Data and Oracle Analytics Cloud as a passion. Ambili has been a frequent Speaker at various international Oracle user group conferences since 2017 and is certified as an Oracle Cloud Platform Enterprise Analytics Professional, Oracle Cloud Infrastructure Digital Assistant Professional and Oracle Certified Professional in Oracle Database Development. She is also a certified associate in Oracle Machine Learning using Autonomous Database, Oracle Cloud Infrastructure and Oracle Cloud Data Management. She has also been actively blogging and taking frequent webinars in her organisation forums.
In her own words, she is an IT Professional by career, a Speaker by passion and an Artist by soul!

Ambili is a Principal Consultant in Analytics with Rittman Mead Consulting LTD with an industry experience of around 19 years. Her special focus is on Oracle Analytics, Oracle Digital Assistant, Oracle Database, Big Data and Graph DB primarily. Ambil... Show more

Certified AI Wrangler, Oracle ACE Associate, Microsoft MVP, Docker Captain and passionate Java developer. Johannes builds modern applications with Vaadin, Spring, Quarkus, Kubernetes, and Langchain4j, often exploring AI integration. Public speaker, Live-Coder and open-source enthusiast. Proud husband and father of three.

Certified AI Wrangler, Oracle ACE Associate, Microsoft MVP, Docker Captain and passionate Java developer. Johannes builds modern applications with Vaadin, Spring, Quarkus, Kubernetes, and Langchain4j, often exploring AI integration. Public speaker, L... Show more

I work at the intersection of AI Adoption, technology communities, and tech events, helping companies, developers, and ecosystems turn emerging technologies into real-world adoption and business opportunities.

I am an Oracle ACE Associate and IBM Champion, Co-Founder of HumaSynk, and Founder and Leader of the Quarkus Club community. I am also a SouJava member, speaker, community leader, and technology event organizer.

Through HumaSynk, I focus on creating strategies and experiences that connect technology, people, and business. This includes AI adoption initiatives, hands-on workshops, community engagement, technology conferences, and ecosystem activation across Latin America.

I am also Co-Founder and organizer of DevConverge LATAM, an initiative created to connect developer communities, technology leaders, and companies across the region.

My current mission is to help organizations move beyond simply talking about AI and start adopting it in practice, connecting technology providers with developers, builders, leaders, and companies through communities, practical experiences, and high-impact technology events.

I work at the intersection of AI Adoption, technology communities, and tech events, helping companies, developers, and ecosystems turn emerging technologies into real-world adoption and business opportunities. I am an Oracle ACE Associate and IBM ... Show more

Ron Ekins is the Director of Field Solution Architecture for EMEA & LATAM at Everpure, where he serves as the primary technical advisor on data-related discussions. With over 30 years of experience in data management, Ron brings a wealth of expertise in the development, design, and delivery of complex information systems projects. His extensive background is complemented by his notable contributions to the field, including 4 granted US patents related to data security and governance.

An esteemed Oracle ACE Director, Ron is an active and influential member of the global Oracle community and has had the privilege of speaking at numerous prestigious industry conferences around the world.

Ron Ekins is the Director of Field Solution Architecture for EMEA & LATAM at Everpure, where he serves as the primary technical advisor on data-related discussions. With over 30 years of experience in data management, Ron brings a wealth of expertise... Show more

Nicolas Fränkel is a technologist focusing on cloud-native technologies, DevOps, CI/CD pipelines, and system observability. His focus revolves around creating technical content, delivering talks, and engaging with developer communities to promote the adoption of modern software practices. With a strong background in software, he has worked extensively with the JVM, applying his expertise across various industries. In addition to his technical work, he is the author of several books and regularly shares insights through his blog and open-source contributions.

Nicolas Fränkel is a technologist focusing on cloud-native technologies, DevOps, CI/CD pipelines, and system observability. His focus revolves around creating technical content, delivering talks, and engaging with developer communities to promote the... Show more

Aicha Laafia, a Java software engineer at SQLI with a love for coding, an interest in sustainability, and a commitment to empowering women in tech.

I am a Women Techmakers and Girls Code ambassador, an Oracle ACE Associate, a member of the Moroccan Association of Computing Science, and part of the JetBrains Community Contributor program.

I focus on creating software with minimal environmental impact while mentoring and supporting women in technology.

When I’m not coding, I enjoy exploring delicious food, phone photography, and watching Formula 1.

Aicha Laafia, a Java software engineer at SQLI with a love for coding, an interest in sustainability, and a commitment to empowering women in tech. I am a Women Techmakers and Girls Code ambassador, an Oracle ACE Associate, a member of the Morocca... Show more

Andrej Pashchenko started his IT career in the early 1990s and has been working with Oracle Database since 1999. Over the past 15 years, he has focused on consulting, supporting customer projects in the areas of data warehousing, data modeling, ETL, and SQL performance. He has been actively sharing his knowledge since 2011 through blogging, speaking at international conferences, and teaching, helping others get the best out of Oracle Database. For his technical expertise and his long-standing commitment to knowledge sharing, Oracle has recognized him as an Oracle ACE Pro.

Andrej Pashchenko started his IT career in the early 1990s and has been working with Oracle Database since 1999. Over the past 15 years, he has focused on consulting, supporting customer projects in the areas of data warehousing, data modeling, ETL, ... Show more

A Data enthusiast more widely interested in Business Analytics/DW/EPM solutions with a special focus on Oracle products and solutions.
Oracle ACE Director, owner of DATAlysis LLC, a consulting company in Switzerland, he has more than 15 years of experience in multiple project roles like architect, analyst, team lead and developer, bridging together the business and the technical side of the BA world.
His other activities include training delivery, R&D, blogging and supporting the Oracle community on the forums and by presenting at multiple events.

A Data enthusiast more widely interested in Business Analytics/DW/EPM solutions with a special focus on Oracle products and solutions. Oracle ACE Director, owner of DATAlysis LLC, a consulting company in Switzerland, he has more than 15 years of ex... Show more

Software engineer and team leader with more than a decade of experience in developing and maintaining web applications, with a particular focus on applications written in the Java ecosystem. Neither afraid of working on code, even on code that is already “legacy”, nor of designing a CI/CD processes that streamline development and deployment. Enthusiast of clean, straightforward code that solves business problems effectively, prioritizing readability and simplicity.

Software engineer and team leader with more than a decade of experience in developing and maintaining web applications, with a particular focus on applications written in the Java ecosystem. Neither afraid of working on code, even on code that is alr... Show more

Pavan Madduri is a Senior Cloud Platform Engineer at W.W. Grainger, where he runs the Kubernetes platforms behind a Fortune 500 company's workloads. He is the elected Tech Lead of CNCF's TAG Workloads Foundation for the 2026 to 2028 term and leads the CNCF TOC's Distributed Agentic Systems initiative. His analysis of scale-out model loading is part of the CNCF AI Scheduling Challenges whitepaper.

Pavan contributes to Dragonfly, a graduated CNCF project, where he wrote the Hugging Face and ModelScope backends for peer-to-peer model distribution. He created keda-gpu-scaler, an open source KEDA scaler for GPU workloads, and gpu-mcp-server, an MCP server that gives AI agents live NVIDIA GPU metrics.

He is an IEEE Senior Member, a peer reviewer for IEEE journals, and a CNCF Golden Kubestronaut. He writes about AI infrastructure and agentic systems for the CNCF and AAIF blogs, Cloud Native Now, VKTR, and Platform Engineering, and his research has been published by IEEE. He has spoken at HPSFCon 2026 and KyvernoCon 2026 and speaks at KubeCon + CloudNativeCon North America 2026.

Pavan Madduri is a Senior Cloud Platform Engineer at W.W. Grainger, where he runs the Kubernetes platforms behind a Fortune 500 company's workloads. He is the elected Tech Lead of CNCF's TAG Workloads Foundation for the 2026 to 2028 term and leads th... Show more

Nelson Calero is a senior data engineer with 20+ years of extensive experience in Oracle, PostgreSQL, Google Cloud, and other database technologies. A seasoned presenter and community leader, he shares his insight and expertise on database products at various events globally. Nelson works as a Principal Consultant for Pythian - as the last technical team escalation point handling the Pythian client's most challenging and serious database technical problems.

He is an Oracle ACE Director and Oracle Certified Professional, a member of the Board of the Latin American Oracle User Community (LAOUC), and a leader of the Uruguayan Oracle User Group (UYOUG).

Nelson Calero is a senior data engineer with 20+ years of extensive experience in Oracle, PostgreSQL, Google Cloud, and other database technologies. A seasoned presenter and community leader, he shares his insight and expertise on database products ... Show more

Luiz Real is a Software Engineer with 20+ years of experience. Passionate about Java, AI, and emerging technologies, he’s a SouJava São Paulo JUG leader and co-host of The Out of the Box Developer podcast. Beyond his technical leadership, Luiz dedicates part of his career to teaching and mentoring, connecting academic concepts with real-world practices. He is a frequent speaker at conferences, meetups, and technology events, and is currently working on his first book about Software Engineering Fundamentals.

Luiz Real is a Software Engineer with 20+ years of experience. Passionate about Java, AI, and emerging technologies, he’s a SouJava São Paulo JUG leader and co-host of The Out of the Box Developer podcast. Beyond his technical leadership, Luiz dedica... Show more

Stefan Oehrli is an Oracle ACE Director and Oracle Database Security Architect at Accenture, where he works as a Tech Architecture Manager. A trained electrical engineer, he has worked with Oracle databases since 1998 — first as a DBA and team lead at a major Swiss telecom provider, then for over a decade as a Solution Manager and trainer at Trivadis, now part of Accenture. He specializes in Oracle Database security — Advanced Security, Unified Auditing, Data Safe, encryption, and Oracle Unified Directory — and has secured Oracle environments across Swiss government, telecom, automotive, and insurance. He co-authored the security chapter of Der Oracle DBA (Hanser, 2016), speaks regularly at DOAG, AOUG, SOUG, OUGN, UKOUG, and Oracle CloudWorld / AI World, and maintains an open Oracle security knowledge base at oradba.ch.

Stefan Oehrli is an Oracle ACE Director and Oracle Database Security Architect at Accenture, where he works as a Tech Architecture Manager. A trained electrical engineer, he has worked with Oracle databases since 1998 — first as a DBA and team lead a... Show more

Passionate OCI professional and Oracle Apps engineer. Working for a few years with Oracle products and I always try to get the best out it!

Focusing on networking and security and helping with migrations of workloads to OCI or implementing applications to OCI. Designing, building and maintaining tenants.

With that comes experience and knowledge that I am sharing with the community.

Passionate OCI professional and Oracle Apps engineer. Working for a few years with Oracle products and I always try to get the best out it! Focusing on networking and security and helping with migrations of workloads to OCI or implementing applica... Show more

As a software developer at Mechhive, I consistently research new programming techniques and pragmatically apply them to our codebase. I favor functional, stable solutions above theoretical perfection.

As a software developer at Mechhive, I consistently research new programming techniques and pragmatically apply them to our codebase. I favor functional, stable solutions above theoretical perfection. Show more

Database Engineer at Percona, working primarily with MySQL and its forks.
An open-source enthusiast who loves to check coding and create PR's when possible. Love working with MySQL tools such as ProxySQL, Orchestrator, and Percona Toolkit.

Database Engineer at Percona, working primarily with MySQL and its forks. An open-source enthusiast who loves to check coding and create PR's when possible. Love working with MySQL tools such as ProxySQL, Orchestrator, and Percona Toolkit. Show more