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iSAQB Software Architecture Gathering - Digital 2021

The Leading International Conference for Software Architecture

OCTOBER 11–14,2021

Keynotes of the SAG 2021

The future of the Past – Legacy will stay with us

We have been building software systems for over sixty years, and they continue to grow in size and complexity. Not only do we have legacy mainframe systems, but systems in object-oriented programming languages have grown so rapidly and uncontrollably over the last twenty years that many of them have become large obscure tangles as well. All this legacy code drives up development costs and makes us reluctant to touch these old software systems. Is this inevitable? Or is there also good legacy? And what can we do to get our Legacy in good shape and keep it that way?

Beyond the Known Knowns

Certainty is the comfort zone of software architecture. The idea that architecture offers a dependable, stable and solid foundation on which to build. Sadly, such certainty is in conflict with the nature of reality. By definition, most software development is development in the presence of incomplete knowledge. Any development process that offers certainty of knowledge through early planning is faking and bluffing that certainty. This talk looks at the relationship of knowledge to software, the codification of knowledge in architecture, the acquisition of knowledge to development process, and how we can make progress in the presence of known unknowns, unknown unknowns and unknowable unknowns.

Architectural patterns for rapid, reliable, frequent and sustainable development

Rapid, reliable, frequent and sustainable software development requires an architecture that is loosely coupled and modular.
Teams need to be able complete their work with minimal coordination and communication with other teams.
They also need to be able keep the software’s technology stack up to date.
However, the microservice architecture isn’t always the only way to satisfy these requirements.
Yet, neither is the monolithic architecture.

In this talk, I describe loose coupling and modularity and why they are is essential.
You will learn about three architectural patterns: traditional monolith, modular monolith and microservices.
I describe the benefits, drawbacks and issues of each pattern and how well it supports rapid, reliable, frequent and sustainable development.
You will learn some heuristics for selecting the appropriate pattern for your application.

Architecture, Babies, and Bathwater

To seasoned software architects, it sometimes seems as if our discipline is more alike to the fashion industry than we’d like, and the hype cycle might be the best-known (pseudo-)mathematical graph in our community. Is everything new really only old stuff in new disguise, or is that just old folks yelling at the cloud? How do we distinguish genuine innovation from lipstick on a pig? And will we be able to get through this keynote without even more cliché-ridden puns? Find out and join me for a look at some examples and an attempt to draw useful conclusions.

Evolutionary Architecture: Principles and Patterns

Evolutionary Architecture is a natural culmination of both the maturing of Agile software development and the increasing role of patterns in architecture. This talk will describe the evolution of evolutionary architecture, examining the role of patterns, I will then review the various principles of evolutionary architecture, focusing on the integration of these principles into enterprise systems.

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