Period
to 17 November 2017

The following table provides summary statistics for contract job vacancies advertised in the City of London with a requirement for CQRS skills. Included is a benchmarking guide to the contractor rates offered in vacancies that have cited CQRS over the 6 months to 17 November 2017 with a comparison to the same period in the previous 2 years.

Note that daily and hourly rates are treated separately in these statistics. When calculating contractor rate percentiles, daily rates are never derived from quoted hourly rates or vice versa.

Command-Query Responsibility Segregation (also Command-Query Separation)
Central London > City of London
6 months to
17 Nov 2017
Same period 2016 Same period 2015
Rank 233 239 280
Rank change year-on-year +6 +41 +11
Contract jobs citing CQRS 18 7 1
As % of all contract IT jobs advertised in the City of London 0.25% 0.10% 0.011%
As % of the Processes & Methodologies category 0.29% 0.12% 0.013%
Number of daily rates quoted 17 7 1
City of London median daily rate £600 £600 £550
Median daily rate % change year-on-year - +9.09% +37.50%
10th Percentile £475 £400 £475
90th Percentile £690 £800 £625
Central London median daily rate £530 £475 £550
% change year-on-year +11.58% -13.64% +37.50%
Number of hourly rates quoted 0 0 0
City of London median hourly rate - - -
Central London median hourly rate - - -

CQRS is in the Processes and Methodologies category. The following table is for comparison with the above and provides summary statistics for all contract job vacancies advertised in the City of London with a requirement for process or methodology skills.

All Process and Methodology Skills
City of London
Contract vacancies with a requirement for process or methodology skills 6297 5887 7808
As % of all contract IT jobs advertised in the City of London 88.45% 87.51% 83.93%
Number of daily rates quoted 5003 4710 6215
City of London median daily rate £513 £475 £463
Median daily rate % change year-on-year +7.89% +2.70% +2.78%
10th Percentile £325 £313 £285
90th Percentile £688 £663 £650
Central London median daily rate £500 £475 £451
% change year-on-year +5.26% +5.44% +1.24%
Number of hourly rates quoted 59 55 76
City of London median hourly rate £20.00 £20.00 £20.50
Median hourly rate % change year-on-year - -2.44% +7.89%
10th Percentile £13.34 £12.15 £10.99
90th Percentile £30.90 £53.05 £40.00
Central London median hourly rate £20.25 £19.00 £20.00
% change year-on-year +6.58% -5.00% +11.14%

CQRS
Job Vacancy Trend in the City of London

Job postings citing CQRS as a percentage of all IT jobs advertised in the City of London.

Job vacancy trend for CQRS in the City of London

CQRS
Contractor Daily Rate Trend in the City of London

This chart provides the 3-month moving average for daily rates quoted in contract jobs citing CQRS in the City of London.

Contractor daily rate trend for CQRS in the City of London

CQRS
Contractor Daily Rate Histogram in the City of London

The daily rate distribution of IT jobs citing CQRS in the City of London over the 6 months to 17 November 2017.

Contractor daily rate histogram for CQRS in the City of London

For the 6 months to 17 November 2017, IT contractor jobs citing CQRS also mentioned the following skills in order of popularity. The figures indicate the number co-occurrences and its proportion to all contract ads across the City of London region with a requirement for CQRS.

1 17 (94.44%) Agile Software Development
2 14 (77.78%) Continuous Integration
3 13 (72.22%) Domain-Driven Design
3 13 (72.22%) Amazon AWS
3 13 (72.22%) TDD
3 13 (72.22%) JavaScript
4 12 (66.67%) BDD
4 12 (66.67%) Redux
5 10 (55.56%) Java
6 9 (50.00%) Web Services
6 9 (50.00%) PostgreSQL
6 9 (50.00%) RESTful
6 9 (50.00%) Software Engineering
6 9 (50.00%) Fintech
6 9 (50.00%) Microservices
6 9 (50.00%) React
6 9 (50.00%) REST
6 9 (50.00%) Gradle
7 8 (44.44%) Kafka
7 8 (44.44%) NoSQL
7 8 (44.44%) MongoDB
7 8 (44.44%) Finance
7 8 (44.44%) C#
7 8 (44.44%) .NET
8 7 (38.89%) DevOps
9 6 (33.33%) Jenkins
9 6 (33.33%) SQL
9 6 (33.33%) Scrum
10 5 (27.78%) Objective-C
10 5 (27.78%) Publishing

CQRS
Co-occurring IT Skills in the City of London by Category

The follow tables expand on the table above by listing co-occurrences grouped by category. The same job type, locality and period is covered with up to 20 co-occurrences shown in each of the following categories:

Application Platforms
1 5 (27.78%) Elasticsearch
2 4 (22.22%) NServiceBus
Cloud Services
1 13 (72.22%) Amazon AWS
2 5 (27.78%) Google Play
2 5 (27.78%) Microsoft Azure
3 4 (22.22%) Heroku
4 1 (5.56%) Amazon SQS
Communications & Networking
1 4 (22.22%) DNS
1 4 (22.22%) FTP
1 4 (22.22%) HTTP
1 4 (22.22%) SSL
1 4 (22.22%) TCP/IP
Database & Business Intelligence
1 9 (50.00%) PostgreSQL
2 8 (44.44%) MongoDB
2 8 (44.44%) NoSQL
3 5 (27.78%) Amazon DynamoDB
3 5 (27.78%) Apache Cassandra
3 5 (27.78%) MySQL
3 5 (27.78%) Neo4j
3 5 (27.78%) Redis
4 4 (22.22%) Relational Database
5 1 (5.56%) SQL Server
Development Applications
1 9 (50.00%) Gradle
2 6 (33.33%) Jenkins
3 5 (27.78%) Cucumber
3 5 (27.78%) Maven
3 5 (27.78%) SonarQube
4 4 (22.22%) TeamCity
4 4 (22.22%) webpack
5 3 (16.67%) Git (software)
5 3 (16.67%) SpecFlow
5 3 (16.67%) Subversion
6 1 (5.56%) Burp Suite
6 1 (5.56%) JMeter
6 1 (5.56%) Protractor
6 1 (5.56%) WebDriver
General
1 8 (44.44%) Finance
2 5 (27.78%) Banking
2 5 (27.78%) Publishing
Job Titles
1 13 (72.22%) Developer
2 5 (27.78%) Full Stack Developer
2 5 (27.78%) Java Developer
3 4 (22.22%) .NET Developer
3 4 (22.22%) Architect
3 4 (22.22%) Platform Architect
4 3 (16.67%) Lead Developer
4 3 (16.67%) Technical Developer
4 3 (16.67%) Technical Leader
5 2 (11.11%) Analyst
5 2 (11.11%) E-Commerce Developer
6 1 (5.56%) Analyst Developer
6 1 (5.56%) AWS Developer
6 1 (5.56%) Software Analyst
6 1 (5.56%) Software Test Analyst
6 1 (5.56%) Test Analyst
Libraries, Frameworks & Software Standards
1 12 (66.67%) Redux
2 9 (50.00%) React
2 9 (50.00%) REST
2 9 (50.00%) RESTful
2 9 (50.00%) Web Services
3 8 (44.44%) .NET
3 8 (44.44%) Kafka
4 5 (27.78%) Android SDK
4 5 (27.78%) gRPC
4 5 (27.78%) iOS SDK
4 5 (27.78%) React Native
4 5 (27.78%) ReactiveX
4 5 (27.78%) Spring
4 5 (27.78%) Spring Boot
4 5 (27.78%) Spring Security
5 4 (22.22%) Guice
5 4 (22.22%) Node.js
5 4 (22.22%) OAuth
5 4 (22.22%) RabbitMQ
5 4 (22.22%) SOAP
Miscellaneous
1 9 (50.00%) Fintech
2 5 (27.78%) Analytical Skills
2 5 (27.78%) Mobile App
3 4 (22.22%) Computer Science
3 4 (22.22%) Public Cloud
4 3 (16.67%) Greenfield Project
4 3 (16.67%) Hedge funds
Operating Systems
1 5 (27.78%) Android
1 5 (27.78%) Apple iOS
2 4 (22.22%) CoreOS
2 4 (22.22%) Linux
Processes & Methodologies
1 17 (94.44%) Agile Software Development
2 14 (77.78%) Continuous Integration
3 13 (72.22%) Domain-Driven Design
3 13 (72.22%) TDD
4 12 (66.67%) BDD
5 9 (50.00%) Microservices
5 9 (50.00%) Software Engineering
6 7 (38.89%) DevOps
7 6 (33.33%) Scrum
8 5 (27.78%) Continuous Delivery
8 5 (27.78%) Functional Testing
8 5 (27.78%) Open Source
8 5 (27.78%) OWASP
8 5 (27.78%) Test Automation
9 4 (22.22%) Event-Driven Architecture
9 4 (22.22%) Extreme Programming
9 4 (22.22%) OO
9 4 (22.22%) Pair Programming
9 4 (22.22%) Refactoring
9 4 (22.22%) SOLID
Programming Languages
1 13 (72.22%) JavaScript
2 10 (55.56%) Java
3 8 (44.44%) C#
4 6 (33.33%) SQL
5 5 (27.78%) ES6
5 5 (27.78%) GraphQL
5 5 (27.78%) Objective-C
6 4 (22.22%) Groovy
Qualifications
1 4 (22.22%) Computer Science Degree
1 4 (22.22%) Degree
System Software
1 4 (22.22%) Docker
Systems Management
1 5 (27.78%) Ansible
2 4 (22.22%) Docker Swarm
2 4 (22.22%) Puppet
2 4 (22.22%) Terraform
Vendors
1 5 (27.78%) Apple
1 5 (27.78%) Google