What we’re about
An open and friendly community that supports the adoption and practice of Clojure in any of its forms.
Clojure is a great way to learn functional programming thanks to a small and well-crafted syntax and focus on simplicity. Clojure is a powerful, productive and fun language, based on LISP and hosted on Java, JavaScript, Microsoft CLR, GraalVM, and Golang.
London Clojurians is a very active community with several events per month, including technical talks, coding dojo's, hackdays and a yearly conference. We hope you will join us and increase your knowledge and appreciation of Clojure and add your own experiences to our community.
If you would like to propose a talk please fill out the following form: https://bit.ly/ldnclj and one of the organisers will be in touch with you.
Upcoming events
5
•OnlineThe Gaiwan Stack (by Arne Brasseur)
OnlineTHIS IS AN ONLINE EVENT
[Connection details will be shared 1h before the start time]
The London Clojurians are happy to present:
Title: The Gaiwan Stack
Speaker: Arne Brasseur
Time: 2025-11-11 @ 18:30 (London time)
Local time: click here for local timeArne Brasseur (https://arnebrasseur.net) will be presenting:
"The Gaiwan Stack"Since 2019 Gaiwan has either built or been involved with close to two dozen Clojure applications. This gives us a unique vantage point to look at the ecosystem. Over time we've largely settled on a stack of libraries, tools, and practices that we are happy with. In this talk we'll go over what that stack looks like, which alternatives we've considered, and why we made certain choices.
Arne has been writing software since the early nillies. He started making Clojure screencast under the Lambda Island monniker in 2016 as a way to share his love for functional programming. In 2019 he founded the Gaiwan software consultancy. He's known for his open source projects like Kaocha, and for community organising, such as the Heart of Clojure conference in Belgium.
If you missed this event, you can watch the recording on our YouTube channel:
https://www.youtube.com/@LondonClojurians
(The recording will be uploaded a couple of days after the event.)Please, consider supporting the London Clojurians with a small donation:
https://opencollective.com/london-clojurians/Your contributions will enable the sustainability of the London Clojurians community and support our varied set of online and in-person events:
- ClojureBridge London: supports under-represented groups discover Clojure
- re:Clojure: our annual community conference
- monthly meetup events with speakers from all over the world
- subscription and admin costs such as domain name & StreamYard subscription
Thank you to our sponsors:
- https://juxt.pro/
- And many individual sponsors
13 attendees
London Clojure Dojo at uSwitch
uSwitch, 5 Copper Row, London, SE1 2LH, London, London, GBuSwitch is located on the first floor of the ZPG building at 5 Copper Row, London, SE1 2LH, London (Click on the map for directions)
What 3 words location: https://what3words.com/puts.sudden.else
The Clojure dojo is a collaborative way to learn Clojure/ClojureScript through practice. The aim is to learn a little more than before you started. This event is for those new to coding through to more experienced developers.
We organise into small groups (2-4) people and write code to solve challenges great and small, chosen by those at the event.
We aim to ensure someone in your group has some Clojure experience, so you shouldn't feel lost (well no more than all developers do when Stack Overflow is broken).
Example challenges for the coding dojo are listed on this website: http://www.londonclojurians.org/code-dojo/
Various past exercises have been loaded to
https://github.com/ldnclj# Approximate schedule:
18:40 Doors open and start collecting suggestions
18.45 Pizza should have arrived
19:00 Quick intros and vote on suggestions
19:15 Break out into groups and start practising
20:45 Gather together for a quick show and tell# What should I bring?
We organise into small groups, so if you have a laptop with a working Clojure environment please bring it along (there are lots of online Clojure environments, so you can just use your browser too).
# How do I get in to the building?
At the glass doors press the buzzer to inform the security guard you are here. Say you are here for the event on the first floor.
Is there way to talk with the Clojure community?
Why yes. The Clojurians Slack channel is full of friendly people who love to try and help. People based in London are often in the #clojure-uk channel. Sign up for a free account to the Clojurians Slack community via http://clojurians.net/
What is Clojure?
Clojure is a JVM language that has syntactically similarities to Lisp, full integration with Java and its libraries and focuses on providing a solution to the issue of single machine concurrency.
Its small core makes it surprisingly easy for Java developers to pick up and it provides a powerful set of concurrency strategies and data structures designed to make immutable data easy to work with. If you went to Rich Hickey’s LJC talk about creating Clojure you’ll already know this, if not it’s well worth watching the Rich Hickey “Clojure for Java Programmers” video or Stuart Halloway “Radical Simplicity” video .
6 attendees
•OnlineA Json-Schema/OpenAPI Renaissance (by Max Penet)
OnlineTHIS IS AN ONLINE EVENT
[Connection details will be shared 1h before the start time]
The London Clojurians are happy to present:
Title: A Json-Schema/OpenAPI Renaissance
Speaker: Max Penet
Time: 2025-11-25 @ 18:30 (London time)
Local time: click here for local timeMax Penet (https://github.com/mpenet) will be presenting:
"A Json-Schema/OpenAPI Renaissance"This talk explores how OpenAPI and JSON Schema can support building robust Clojure services, discussing the various approaches to doing so. It introduces the Legba library and examines the broader JSON Schema ecosystem.
Max Penet has been working professionally with Clojure for over 15 years. He currently works at Exoscale, a European, privacy-focused cloud provider, where he uses Clojure daily to help build and operate large-scale cloud infrastructure. Max also contributes to the Clojure community in various ways, one of which is via his open-source work.
If you missed this event, you can watch the recording on our YouTube channel:
https://www.youtube.com/@LondonClojurians
(The recording will be uploaded a couple of days after the event.)Please, consider supporting the London Clojurians with a small donation:
https://opencollective.com/london-clojurians/Your contributions will enable the sustainability of the London Clojurians community and support our varied set of online and in-person events:
- ClojureBridge London: supports under-represented groups discover Clojure
- re:Clojure: our annual community conference
- monthly meetup events with speakers from all over the world
- subscription and admin costs such as domain name & StreamYard subscription
Thank you to our sponsors:
- https://juxt.pro/
- And many individual sponsors
26 attendeesLondon Clojure Dojo at uSwitch
uSwitch, 5 Copper Row, London, SE1 2LH, London, London, GBuSwitch is located on the first floor of the ZPG building at 5 Copper Row, London, SE1 2LH, London (Click on the map for directions)
What 3 words location: https://what3words.com/puts.sudden.else
The Clojure dojo is a collaborative way to learn Clojure/ClojureScript through practice. The aim is to learn a little more than before you started. This event is for those new to coding through to more experienced developers.
We organise into small groups (2-4) people and write code to solve challenges great and small, chosen by those at the event.
We aim to ensure someone in your group has some Clojure experience, so you shouldn't feel lost (well no more than all developers do when Stack Overflow is broken).
Example challenges for the coding dojo are listed on this website: http://www.londonclojurians.org/code-dojo/
Various past exercises have been loaded to
https://github.com/ldnclj# Approximate schedule:
18:40 Doors open and start collecting suggestions
18.45 Pizza should have arrived
19:00 Quick intros and vote on suggestions
19:15 Break out into groups and start practising
20:45 Gather together for a quick show and tell# What should I bring?
We organise into small groups, so if you have a laptop with a working Clojure environment please bring it along (there are lots of online Clojure environments, so you can just use your browser too).
# How do I get in to the building?
At the glass doors press the buzzer to inform the security guard you are here. Say you are here for the event on the first floor.
Is there way to talk with the Clojure community?
Why yes. The Clojurians Slack channel is full of friendly people who love to try and help. People based in London are often in the #clojure-uk channel. Sign up for a free account to the Clojurians Slack community via http://clojurians.net/
What is Clojure?
Clojure is a JVM language that has syntactically similarities to Lisp, full integration with Java and its libraries and focuses on providing a solution to the issue of single machine concurrency.
Its small core makes it surprisingly easy for Java developers to pick up and it provides a powerful set of concurrency strategies and data structures designed to make immutable data easy to work with. If you went to Rich Hickey’s LJC talk about creating Clojure you’ll already know this, if not it’s well worth watching the Rich Hickey “Clojure for Java Programmers” video or Stuart Halloway “Radical Simplicity” video .
3 attendees
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