Who uses Clojureλ︎
Hundreds of companies actively advertised their Clojure adoption. Given the broad participation in user groups there are many more organizations using Clojure within their technology stack.
A quick scan of various job sites shows Clojure positions at companies like Walmart, Facebook, Staples, Consumer Reports, Salesforce, and Amazon. It doesn't get much more mainstream than that.
Case Studiesλ︎
JUXT Clojure In is a Clojure consultancy company and has interviewed numerous CTO's and Tech Leads, discussing the advantages of using Clojure to solve business challenges.
Clojure.org Community Stories also provides insights into companies using Clojure.
Interesting Companiesλ︎
Functional Works a recruitment company focused on functional programming jobs and built their job management platform on Clojure and ClojureScript.
A diverse set of example companies using Clojure for development. Many more can be found at Clojure.org Companies list, Clojure.org Community Stories and JUXT Clojure In.
| Company | Type of applications |
|---|---|
| Boeing | Boeing 737 MAX - onboard maintenance |
| Puppet Labs | DevOps apps & services e.g. trapperkeeper |
| Cisco | Malware analysis & threat intelligence platform (expert system with core.logic) |
| Deuche Bank (UK) | Processing event streams from Apache Storm |
| Atlassian | Collaborative editing platform for all their products |
| Netflix | Map-Reduce languages for writing apps for Hadoop / Pig |
| USwitch (UK) | Creating meaningful data from multiple sources |
| Daily Mail Online (UK) | Publishing pipeline |
| Circle CI (USA) | Front-end of CI server in ClojureScript & test suite |
| CitiGroup | Financial Trading |
| Student Loans company (UK) | Loans management system written in Clojure |
| Powers the LinkedIn social graph | |
| Walmart (USA) | eReceipts project to process every purchase from 5,000+ stores |
| SwiftKey (UK) | Predictive intelligence platform (possibly used with Microsoft Cortana) |
| Roomkey.co.uk | Hotel booking system to rival Expedia (with a tiny development team) |
| Funding Circle (UK & USA) | Adopting Clojure as their main language (from Ruby, etc) |
| Braintree | Payment processing pipeline with Kafka |
| Mastodon C | Data centre analysis (Incanta, Storm) |
| Thoughtworks | Agile development for Client projects world wide |
| Vero Insurance (AUS) | Rebuilt policy management system in Clojure with Thoughworks |
| Meta-X | Performance art (Overtone, Quil) |
| Salesforce (USA) | Build & deployment with Puppet & Application Routing with nginx-clojure |
There are many more examples of projects on the HackerNews thread: Ask HN: Who's using Clojure in Production
Tech Radarλ︎
Clojure is also defined as a technology that can be adopted since 2014, according to the Thoughtworks technology radar.
JUXT also created its own Clojure specific technology radar as there is such an encompassing ecosystem of libraries and services.