Kevin Denver

@KevZ

Full time creative and bibliophile.

LondonJoined September 2024

About

Principal Consultant at Zühlke Engineering. XP, TDD and pair programming advocate. Designs, builds and runs distributed systems at scale, serving 10 million customers.

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Kevin Denver's blogs

Software Engineering Cornersoftware-engineering-corner.zuehlke.com6 posts

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Recently published

software-engineering-corner.zuehlke.com

Untangling Legacy Systems

Whether you're tasked with updating functionality, improving performance, migrating to new technologies, or simply trying to understand an undocumented system for maintenance, dealing with legacy systems is an inevitable challenge in the software ind...

Mar 31, 20257 min read

software-engineering-corner.zuehlke.com

Parsing inconsistent JSON with a reader monad in Java

Ever had an API response make you question its design choices? Like when it gives you an empty array instead of just saying, 'This value is missing,' or throws in an empty string where a null would be way cleaner? If this sounds familiar, you're not ...

Mar 3, 20255 min read

software-engineering-corner.zuehlke.com

Introducing Pair Programming to a Sceptical Team

Last year, I joined a client's team of highly skilled and dedicated Java engineers. The team managed a complex event-driven system with a long history of changing requirements. The original engineers were long gone, making the code difficult to maint...

Feb 3, 20257 min read

software-engineering-corner.zuehlke.com

Refactoring Legacy Code using Tiny Types and Data Oriented Programming in Java

Legacy systems are often procedural and rely heavily on mutable state, which makes them difficult to maintain and extend. This reliance on mutable data structures can lead to issues like unintended side effects and bugs, especially when several parts...

Jan 6, 20258 min read

software-engineering-corner.zuehlke.com

Building observability into the NHS COVID-19 app backend serving 16 million users

When the COVID-19 pandemic swept the globe, it triggered a race to develop digital tools that could help manage and track the spread of the virus. The Department of Health and Social Care (DHSC) oversees the UK's National Health Service (NHS), with ...

Nov 25, 20245 min read

Kevin Denver

About

Available for

Kevin Denver's blogs

Recently published

Untangling Legacy Systems

Parsing inconsistent JSON with a reader monad in Java

Introducing Pair Programming to a Sceptical Team

Refactoring Legacy Code using Tiny Types and Data Oriented Programming in Java

Building observability into the NHS COVID-19 app backend serving 16 million users

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Kevin Denver

About

Available for

Kevin Denver's blogs

Recently published

Untangling Legacy Systems

Parsing inconsistent JSON with a reader monad in Java

Introducing Pair Programming to a Sceptical Team

Refactoring Legacy Code using Tiny Types and Data Oriented Programming in Java

Building observability into the NHS COVID-19 app backend serving 16 million users