Conference Program

Please note:
On this page you will only see the English-language presentations of the conference. You can find all conference sessions, including the German speaking ones, here.

The times given in the conference program of OOP 2023 Digital correspond to Central European Time (CET).

By clicking on "VORTRAG MERKEN" within the lecture descriptions you can arrange your own schedule. You can view your schedule at any time using the icon in the upper right corner.

Thema: Cloud

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  • Dienstag
    07.02.
  • Mittwoch
    08.02.
  • Donnerstag
    09.02.
, (Dienstag, 07.Februar 2023)
16:15 - 17:15
Di 4.3
The Big Move – a Cloud Modernisation Experience
The Big Move – a Cloud Modernisation Experience

Re-purchasing an application is seen as the top of craftsmanship for cloud migrations. But people have rarely seen such a project in practice. This is the courageous journey of a real consumer product running on expensive infrastructure for years with 2 million active users and more than 6PB of data.

The talk takes you on a journey to a German public cloud and shares all the learnings - about shifting massive data, about terraforming infrastructures, about customizing open source and about all it takes to launch and stay in business.

Target Audience: IT people with no fear of few technical details
Prerequisites: Curiosity about a real public cloud modernisation approach
Level: Advanced

Extended Abstract:
The journey will have the following stages:

Stage 1: How architecture for such a quest looks like and how to start?
Three architecture goals will drive the rest of the journey:
- Efficient scaling
- Minimal run efforts
- Release robust customisation

Stage 2: Customisation of an Open Source product

Stage 3: Migration - decisions and actual experiences during migration

Stage 4: Rollout and staying alive

Bernd Rederlechner ist einer der Principal Lead Architects von T-Systems mit Schwerpunkt "Digitale Lösungen". Er war verantwortlich für die Lieferung von kleinen Innovationsprojekten, aber auch von wirklich großen Landschaftsvorhaben, wo er immer eine Balance zwischen Product Owner, Dev, Ops, Test und Security finden musste. Heute liegt seine Passion im Aufbau von Teams, die digitale Ideen zur Reality machen können - für Kunden und für die Deutschen Telekom.

Bernd Rederlechner
Bernd Rederlechner
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16:15 - 17:15
Di 9.3
If it is About Cloud Native Transformation ... It Is Still About People! (Experience Report)
If it is About Cloud Native Transformation ... It Is Still About People! (Experience Report)

I will share our hands-on experience with a cloud native (container) transformation that is currently unfolding. Technically, implementing an Open Shift Container Platform (bare metal) is pretty challenging. Doing this in a way that we will have pretty stuff in our data centers and at the same time making sure that our technical possibilities are actually being used effectively by product developers ... is a different challenge all together.

Join this session if you'd like to hear what we figured out about the people side of this kind of change!

Target Audience: Architects, Management, Developers, Operational Heroes, Product Owners, Agile Coaches, Scrum Masters
Prerequisites: Basic knowledge of DevOps concepts
Level: Advanced

Extended Abstract:
In this session I will share our hands-on experiences implementing a container-based architecture in our organisation. Choosing to implement Open Shift (bare metal) as your container platform is pretty difficult and challenging technically. It is also rather exciting and not too difficult to find smart people willing to help you build and run this new platform. However, it turns out that there is far more to this challenge than just the technology. Therefore, we are adopting an evolutionary implementation approach - stringing together small experiments - towards a flexible, more experimental and proactive culture that will allow us to actually benefit from the technical possibilities our new platform offers. This session is our story of our evolutionary and experimental approach and what we discovered along the way that works in this kind of transformation. Our main "discovery" is that even though at first it seemed mostly a technical transformation, it actually is far more of a human challenge.

We are right in the middle of this transformation so in this talk, I will bring you the latest and most valuable insights and experiences regarding this organisational and cultural transformation that is needed to turn the potential of our container platform into actual value for our organisation. We will summarise our ideas in a practical "this might work" list (bear in mind however there are no best practices, just patterns that might work in your specific situation).

An example of an experiment that turned out useful in our situation is: "create a small separate team that will drive this change". In our organisation we strive to build end-to-end teams, so at first we tried to get this new platform started from within the regular Infra DevOps team (as a huge Epic on the backlog). But people however got swamped in work and annoyed by all the context switching this required. Team members got tired and frustrated with the huge amounts of work, sky high ambitions and lack of progress. So, in the end we did a small experiment by creating a separate, dedicated, core team to get things going. This experiment turned out to be successful (and was thus extended) because it allowed team members to focus on the development of the platform and to build, document and share their experiences along the way, so that this team is also able to incrementally onboard the other teams along the way. Busy OPS-teams and product teams can't just develop the new platform on the side, next to all their other ongoing work. Building a container platform is epic and needs dedicated time and focus, also to keep people in their best energy.

I will share some of our most useful experiments and experiences, all having to do with the human side of this container transformation.

This session is not meant for decision making on going cloud native or not. If you do go cloud native, please bear in mind it is still about people, most of all!

Maryse Meinen is a product leader, currently working in a product owner role, building a full-blown container platform for a new IT infrastructure, together with an awesome team. She is also an active practitioner of Stoic philosophy, trying to live according to values like "humans are made for cooperation", "wisdom" and "perseverance". Always keeping an eye on the human aspect of our work, she strives to humanise our workplace a bit more every day.

Maryse Meinen
, (Mittwoch, 08.Februar 2023)
09:00 - 10:45
Mi 6.1
Kleiner Wanderführer für IT-Systeme
Kleiner Wanderführer für IT-Systeme

Firmen können kaum noch IT-Systeme neu entwickeln, ohne dass existierende Funktionalität mitwandert. Vor die Aufgabe gestellt, ein System von einem Fremdanbieter in eine Public Cloud zu überführen, hat sich gezeigt, dass hilfreiche Wanderführer rar sind.
Diese Session strukturiert Entscheidungswege und Erkenntnisse bei Cloud-basierten Migrationsvorhaben - abgeleitet aus der Migration und Modernisierung von einem Konsumenten-Service mit 6 PB Daten und ca. 2 Mio. Nutzern.

Zielpublikum: Business-Architekt:innen, Entwickler:innen, Projektleiter:innen, Manager, Entscheider
Voraussetzungen: Erfahrung mit IT-Projekten
Schwierigkeitsgrad: Anfänger

Extended Abstract:
Wanderungen versprechen Entspannung, Panorama oder Sehenswürdigkeiten auf dem Weg. Selten steht bei der Planung die erwartete Anstrengung im Vordergrund. Ähnlich ist es mit Cloud-Migrationen: Der positive Beitrag zur geschäftlichen Entwicklung lockt, aber nicht ohne Mühe.

Wir streifen die folgenden Etappen:
1. Tourenplanung: Wie wähle ich den richtigen Migrationsweg, aka. die "Migrationsstrategie"
2. Lohnt sich der Weg: Wie überzeuge ich Entscheider, ein solches Vorhaben zu sponsoren
3. Auf dem Weg bleiben: Wie managt man den Migrationsfortschritt?
4. Bleibende Erinnerungen: Wie begegnet man übergroßen Erwartungen und vermeidet Enttäuschung bei Endkunden und Produktverantwortlichen?

Bernd Rederlechner ist einer der Principal Lead Architects von T-Systems mit Schwerpunkt "Digitale Lösungen". Er war verantwortlich für die Lieferung von kleinen Innovationsprojekten, aber auch von wirklich großen Landschaftsvorhaben, wo er immer eine Balance zwischen Product Owner, Dev, Ops, Test und Security finden musste. Heute liegt seine Passion im Aufbau von Teams, die digitale Ideen zur Reality machen können - für Kunden und für die Deutschen Telekom.

Balancing Legacy and Innovation: Taking your IBM Mainframe on the Modernization Journey
Balancing Legacy and Innovation: Taking your IBM Mainframe on the Modernization Journey

Modernization projects are not a straight line as there’s no one-stop shop. Balance is definitely the right word: we talk here about finding the proper trade-off between quality/costs/timeframe requirements and customized patterns for a successful legacy system modernization. Based on actual use cases, we’ll discuss the available solutions (ERP implementation, code rewriting, middleware, cloud…), and see why combining the relevant tools is key.
Let us take you on a modernization journey and get your IBM mainframe to embrace innovation!

Target Audience: Architects, Developers, Project Leaders, Chief Information Officers
Prerequisites: IBM i (AS400) and IBM z environments, mainframes, software development
Level: Advanced

Extended Abstract:
Trusted by major players in the insurance, banking, industrial and public services, IBM i and IBM z mainframes are undoubtedly powerful and reliable. Yet, the core business applications developed decades ago are no longer suited for today's requirements nor for tomorrow's innovations. Issues are piling up: maintenance, regulations, cybersecurity, mobility, UX/UI, technical debt … all made worse by the lack of skilled and motivated developers able to untangle layers of spaghetti legacy COBOL or RPG codes.

When the Total Cost of Ownership (TCO) is rising, some may consider simply shifting to modern architectures. Remember the massive rush to a famous ERP in the 2000s? Disarray, downtime, sleepless nights dreading data loss … History has taught us that forced march towards efficiency is possible but also that balance to consider the actual business environment and needs could have been a far better solution, both for systems and people.
Successful modernization is about making the most of the existing mainframe (remember, IBM i and IBM z systems are powerful and reliable!), adapting it to the latest IT trends and strategically relocating applications, inside or outside the mainframe.

Let us introduce you to an interesting use case we had a few years ago: this financial institution, specialized in consumer loans, is struggling with the obsolescence of its mainframe core business applications:
•    Accounting
•    Human resources and payroll
•    Customer Relationship Management (CRM)
•    Documentary reporting

Lately, legacy applications had had issues to address new demands from their various users (accountants, HR, sales, management):
•    How to work over 2 accounting exercises?
•    How to add new data and issue monthly statements of account?
•    How to call an external webservice to check customer solvency?
•    How to cope with the stricter compliance checks requested by financial regulations?
•    How to secure remote access for other branches?
•    How to provide a modern, secure and multi-session interface?
•    How to offer mobile access to all kinds of devices?

We’ll discuss a fully customized and easy to implement solution to modernize:
developers’ workstations: Java Integrated Development Environment (IDE)
systems and software: migration, decommissioning, revamping, middleware, runtime, mobile connectivity, web services, cloud
Let’s dive together into this real-world use case and deploy the full array of modernization tools to support this financial institution in her quest for innovation.

Firas Al-Shawi is passionate about software modernization and always has the focus to keep softwares future-proof. He is Senior Consultant and Productmanager working for EasiRun Europa GmbH.

Julie Dumortier is a lifelong entrepreneur with a passion to ‘Simply solve complex problems'. She is President of Metrixware Systemobjects, the French ISV specialized in mainframe modernization.

Bernd Rederlechner
Firas Al-Shawi, Julie Dumortier
Firas Al-Shawi, Julie Dumortier
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11:00 - 11:45
Mi 5.2
Cloud Chaos and Microservices Mayhem
Cloud Chaos and Microservices Mayhem

The cloud has fundamentally changed how we design applications and introduced whole new categories of software-development disasters. With a focus on Java, this talk will introduce some of the new tools, patterns, and best practices for modern distributed application development. It also gives a tour of some of the most painful anti-patterns Holly has seen as a cloud consultant.

Target Audience: Architects, Developers, Strategic Decision Makers
Prerequisites: Basic experience of cloud computing, Knowledge of Java
Level: Advanced

Extended Abstract:
The cloud is just someone else's data center, but it has fundamentally changed how we design software and what we expect from our platforms. Our applications have gotten bigger, more distributed, and more complicated, and there are whole new categories of mistakes we can make. Some things that were a good idea ten years ago turn out to be a terrible idea in the cloud; and what used to be ‘good enough’ for testing really isn’t anymore. Managing microservices architecture demands a lot of us, to ensure observability, operational resiliency, and organisational agility. With a focus on Java, this talk will introduce some of the new tools, patterns, and best practices for modern distributed application development. It also gives a tour of some of the most painful anti-patterns Holly has seen as a cloud consultant.

Holly Cummins is a Senior Principal Software Engineer on the Red Hat Quarkus team. Before joining Red Hat, Holly was a long time IBMer, in a range of roles from cloud consultant, full-stack javascript developer, WebSphere Liberty build architect, JVM performance engineer, to innovation leader. Holly is also a Java Champion, author, and regular keynote speaker. You can follow her on twitter at @holly_cummins or at hollycummins.com.

Holly Cummins
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15:45 - 16:30
KeyMi 2
KEYNOTE: Cloud Adoption Patterns
KEYNOTE: Cloud Adoption Patterns

Learn key patterns, practices, tools, and techniques which lead to successful cloud adoption. Lynn's work with research teams around genomic-scale data pipelines for human health will be highlighted in this keynote.

Independent Cloud Architect and Developer, Lynn is also the author of 35 cloud courses on Linked In Learning. She publishes GitHub (code) and Substack (articles).

Lynn Langit
Lynn Langit
Track: Keynote
Vortrag: KeyMi 2
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, (Donnerstag, 09.Februar 2023)
11:00 - 11:45
Do 7.2
Scale to Zero with Java and Save the Planet (and Money)
Scale to Zero with Java and Save the Planet (and Money)

Java applications are widely used and often several years old. You can use these applications in the cloud via lift-and-shift (helps nothing) or you can rewrite the application in cloud-native style and use the advantages of the cloud.

An alternative for existing applications is missing here. It must be possible to go to the cloud and use advantages such as serverless and scale-to-zero WITHOUT having to rewrite the entire application.
I will show what is already working well today and where the rough edges are.

Target Audience: Architects, Developers
Prerequisites: None
Level: Basic

Additional information:
In the session, we'll move an existing application to the cloud and save over 70 % of operating and maintenance costs with serverless and scale-to-zero.

Richard Fichtner is CEO and Principal Software Architect at XDEV Software GmbH and has worked in the software industry for more than 15 years, often at the interface between business and technology. He is involved in the open-source community to spread knowledge about Java technologies. He speaks at conferences and contributes to various open-source projects such as https://www.rapidclipse.com/. Richard is a leader of the Java User Group Oberpfalz, recognized as Oracle ACE and holds a Master of Science degree in applied computer science. He is passionate about enabling developer productivity and supports teams in the use of cloud solutions. His interests are Java, clean code, cloud, new technologies and everything pragmatic.

Richard Fichtner
Richard Fichtner
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15:45 - 16:30
KeyDo 2
KEYNOTE: Making Sure the New Platform is Actually an Improvement
KEYNOTE: Making Sure the New Platform is Actually an Improvement

Since the dawn of software development, programmers have been perpetually occupied with migrating our "legacy" code to "the new platform". As soon as we finish, it is obsolete, and we need to start over. Today we are typically in the midst of moving to the cloud. We need DevOps, microservices, new frontend frameworks ... there is always some new tool that promises to deliver much better value than our existing solutions. Millions - even billions - are spent on these initiatives. Are they worth it? For whom?
In this presentation we will go through various strategies and their tradeoffs. How can we work with our code bases, staff and users to maximise the actual value delivered? The answer will depend on many things. Be conscious of what exactly you are aiming to achieve.

Christin Gorman has more than 20 years experience with hands-on software development. She is currently working on a large migration project in the Norwegian healthcare sector. She has worked for both startups and large enterprises, on systems varying from real-time control systems to e-commerce. What is important in one field is not necessarily important in others. Both in writing and in presentations, she is known for her entertaining way of raising questions about established truths, and making people think about why they are working the way they do.
Sometimes controversial, but never boring.

Christin Gorman
Christin Gorman
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