Leander Vanderbijl
Staff Software Engineer @Livi - 13 Years Developing, Managing, and Integrating Diverse Online Systems and Applications
London, United Kingdom
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Leander is an engineer and architect that has worked across the entire stack and has been working at Kry/Livi for the past number of years. He has developed large enterprise applications, migrated cloud platforms, designed data query frameworks, architected integration systems and built lots and lots of APIs. Having worked in large enterprises, small companies and, most recently, in healthcare, he has built the monolith, torn it apart and then rebuilt it again.
Area of Expertise
Topics
Modernising in Healthcare - a case study in decision making
Modern developers know about microservices, they know about cloud native software, they want to build new microservices in cloud native technologies using the latest patterns.
Unfortunately many of us have massive legacy applications with heaps of tech debt, badly defined modules and spaghetti messes of code.
How do you modernise a legacy application? What choices are you likely to face and what are some strategies for making good decisions?
At Livi we migrated a large, on-premise legacy application to the cloud.
In this talk, we look at the challenges we faced, the hurdles we overcame (and some we didn’t), and the thinking behind the choices we made throughout our journey.
We will look at how we leveraged api patterns to solve problems with complexity, modern frameworks to solve, or at least hide, legacy code and cloud-native technologies to provide security and observability across the entire application. We will also analyse some of the options we didn’t use, and discuss why.
First delivered at QCon London 2024.
This is a 50 minute talk.
Transforming Primary Care: Applying DDD to a scale-up
As our company developed through startup and scale up phases, our systems grew larger and more complex. Our usage increased dramatically and our requirements ballooned.
In this session, we will look at how our software and architecture developed into a Conway’s law spider web of interdependent services. We will examine how a start-up environment and the need to find product market fit quickly encourages developers to favour feature and product development over scalable, re-usable and DRY code.
We will show how we used domain driven principles to give our systems structure and provide guidance to our developers. We will study the complexities of refactoring using a domain driven approach in a large existing code base and share some approaches that worked for us.
First delivered at QCon 2025. This is a 45 minute presentation. The target audience is both new and experienced DDD practitioners or architects and developers seeking to apply DDD principles to their existing codebase.
DDD Europe, EventCentric, Data Mesh Live - 2025 Sessionize Event Upcoming
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