For a technology company, building a strong engineering culture is essential for long-term success. Today's software industry is growing so fast that a large proportion of developers will inevitably have less than 5 years experience. At the same time, many software systems contain code that is ten, twenty or even thirty years old.

It's a constant challenge to communicate a healthy culture to newcomers and prevent technical debt from getting out of control. Technical coaching is all about…

"Ich hatte keine Zeit, den Zaun zu flicken" - Dieses Zitat kennt wohl jeder, und doch ertappen wir uns selbst, unseren Zaun nicht geflickt, sondern stattdessen die Hühner gesucht zu haben.
Doch wie ändere ich das?
Dieser Vortrag zeigt mit dem Konzept der MLCs ein Tool auf, dieser Falle zu begegnen und sich selbst und andere in den Modus des kontinuierlichen Lernens zu versetzen.
Am Ende haben die Zuhörenden einen ersten MLC durchlaufen und ein Tool erlernt, um sich und anderen den Freiraum zum…

For a microservices architecture to be successful it is crucial to have the right boundaries between the microservices. But where are the right boundaries? We would like to present a tool that helps us answer this question.

Domain Storytelling is a collaborative modeling method. It brings together domain experts and development teams. We let our users tell us stories about their work. While listening, we record the stories using a pictographic language.

In this talk we show how to find…

The developers have instrumented the applications with OpenTelemetry — great! But that doesn't mean you're ready to roll it out in production yet. What do you need to keep in mind for your instrumentation infrastructure?

* Quick OpenTelemetry overview.
* Tradeoffs between the three architectures you use with OTel (depending on your vendor): vendor exporter vs OTel Collector vs OTel protocol support
* Sampling, including head vs tail based, and how to keep it representative and / or useful.

Targ…

Many approaches to software architecture assume that architecture be planned at the beginning from the project's quality goals. This is problematic as the macroarchitecture is hard to change, and the quality goals it's based on tend to be unknown at the beginning of a project, or change later. Consequently, it would really be preferable if we could defer the macroarchitectural decisions until later.

This talk shows how to do this using systematic modelling and functional programming.

Target…

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…

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…

Discipline, determination, a highly visible area, and a few sticky notes, are all you need to move beyond problems with technical debt.

Target Audience: Developers, Project Leader, Designers, Product Owners, Decision Makers
Prerequisites: Basic Knowledge of Software Development Process
Level: Basic

Extended Abstract:
## Making great software is challenging
It doesn't matter how qualified a team is, it will never be able to produce perfect, flawless, entirely bug-free software.
While teams are…

Even in the time of agile software development and devOps, maintenance and evolution of large-scale software systems remain challenging. This is not only caused by technical debt, but is heavily caused by lost knowledge, high complexity of micro-service architectures, difficult requirements management, not available documentation, and the complexity of communication among and coordination of the many stakeholders. In our session we will talk about the challenges we identified in our study and…

How much design is enough design? How much is overdesign? When does — or should — design happen? How big is 'design'?
Anyone who has ever looked at the methodology landscape or has juggled different roles in software development — programmer, architect, coach, therapist, code paramedic, politician — knows that there are many answers to these questions, and they often contradict one another.

In this talk, we will consider different scales and time frames of design in software, bringing some…

Unfortunately, this presentation has to be cancelled at short notice for personal reasons.

Traditional (i.e. hands-off, blessed-few) approaches to architecture rarely (if ever) work. But in the world of microservices, autonomous teams, and continuous delivery, architecture is more important than ever. Is there an alternative?

Target Audience: Architecture Practitioners (Architects, Lead Developers, etc.)
Prerequisites: Experience delivering software architecture
Level: Advanced

Extended…

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:…

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…

This talk explains how Scenario Casting enables agile teams to pull together despite diverse ideas and concerns - in three iterative collaborative steps:
1. Find example scenarios of how ideas and concerns affect the domain - strictly in domain language! This provides an initial Scenario Backlog outlining the problem space.
2. Prioritize the Scenario Backlog and agree on scope.
3. Combine the top scenarios into coherent overarching Orientation Scenarios.

Let the agile teams focus on their parts…

With GraphQL a modern and flexible way of providing APIs for our data is emerging.
The clients specify which data they need, the provisioning of data becomes more flexible and dynamic. Over-fetching or under-fetching are history.
But does this mean we have to rewrite all APIs to benefit? How can we retrofit a GraphQL API onto our existing API landscape?
We will explore three different approaches.

Target Audience: Architects, Developers
Prerequisites: Basic knowledge in API design and Java
Level:…

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,…

How to structure your program right? This has been a central question since the beginning of software development. Layers are a start, but not enough. Hexagonal, Onion, and Clean Architecture have joined the club together with DDD's Tactical Design and Pattern Languages. Great system design is not achieved with one of these alone. Putting all the ingredients together we can build the Architecture Hamburger – the combination that makes high quality software possible.

Target Audience: Architects,…

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.

One of the fundamental strategies of Agile Modeling is that artifacts, including architecture models, should be just barely good enough (JBGE). Another way of saying this is your models should be sufficient for the task at hand, no more and no less. But sufficiency is contextual in nature, it depends.
In this session we will look at the issue of model sufficiency, exploring the risk factors that motivate us to model more as well as the conditions that enable us to model less.

Target Audience:…

In 2022, is having a dedicated software architect still useful, or are there better ways to fulfil this role? The answer, as usual, is "it depends”.

Target Audience: Software Developers and Architects
Prerequisites: None
Level: Advanced

Extended Abstract:
Traditional approaches to software architecture usually trigger thoughts of ivory tower dictators who are a long way removed from the process of building software, probably because they no longer write code anymore. This unfortunate stereotype…

In a microservices architecture, services shall be as loosely coupled as possible. Still, they need to communicate with each other in order to fulfill business requirements. This talk will help you shape an answer for the typical questions (like shall I be synchronous or asynchronous and what's a good protocol to use?). You will better understand not only the architectural implications but also the effect on the productivity of your teams.

Target Audience: Developers, Architects
Prerequisites:…

As developers, our job is to deliver working software. With the shift to CI/CD and the move to the cloud, the need to have the right feedback at the right time only increases. There are many ways that testing can help us with that. Not only can testing help us verify our solution and prevent us from breaking things, it can also help us design our software, find flaws in our architecture and come up with better solutions. In this talk I will highlight some of the many ways that testing can help…

In this session I’ll examine some of the things that can go wrong when organisations jump headfirst into micro-service architectures without understanding the potential pitfalls.

I'll explain contract testing from the ground up. You'll learn how it can decouple micro-service dependencies during development, allowing your teams to work effectively. And I'll describe sophisticated, free, open-source tooling that helps integrate contract testing into your software lifecycle, giving you the…

You know the story, one dev in the team found out about this amazing new framework which will solve potentially aaaall your problems; but the product owner stops him right away. There is definitely no time until the next roadmap milestone is reached and you’re already late. We have introduced the tool Tech Radar – in two different organisational setups – to make technology strategy explicit.

In this talk I’ll share our learnings on how we made sure our teams don’t drown in legacy, train them on…

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…

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…

Software Development based on a distributed architecture provides both several advantages and new challenges. In order to take advantage of the distribution it requires implementation of service discovery, routing, load-balancing, resilience mechanisms and more. These requirements can be covered by language frameworks or the underlying platform.

This talk will walk through a comparison of various approaches with focus on frameworks, Kubernetes and extending options like Service Meshes and eBPF.…

What should you do if you are promoted or hired to be the first Head of Architecture in a big, international organisation? What should you do to shape the role to deliver value to the organisation and its customers? How do you work with many development teams to shape the current legacy spaghetti mess into a coherent system, without becoming a bottleneck?

In this talk I'll respond to all questions and more, by sharing my experience in becoming the first Head of Architecture in a big…

When building systems, it can be too easy to focus on features and overlook software qualities related to architecture. If not enough attention is given to qualities related to the architecture, technical debt and design problems can creep in until it becomes muddy with the effect of teams being less agile. Sustainable architecture requires ongoing attention, especially when there are evolving priorities, technical risks, and many dependencies. This talk presents practices for creating and…

Language defines the boundary to our world: it sets what we can describe and what we can’t. This talk describes how to formalize a ubiquitous language into a domain-specific language. The resulting language is used for communication and collaboration as well as used as a basis for generating code, tests, configs, etc. The talk is based on industry cases from various domains, such as banking and insurance, industry automation and automotive.

Target Audience: Developers, Subject Matter/Domain…