The following table provides summary statistics for contract job vacancies advertised in the City of London with a requirement for WebSockets skills. Included is a benchmarking guide to the contractor rates offered in vacancies that have cited WebSockets over the 3 months to 23 June 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.

WebSockets
London / City of London
3 months to
23 Jun 2017
Same period 2016 Same period 2015
Rank 159 148 198
Rank change year-on-year -11 +50  
Contract jobs citing WebSockets 7 16 3
As % of all contract IT jobs advertised in the City of London 0.21% 0.47% 0.052%
As % of the Libraries, Frameworks & Software Standards category 0.56% 1.36% 0.17%
Number of daily rates quoted 7 16 3
Median daily rate £530 £338 £520
Median daily rate % change year-on-year +57.03% -35.09%  
UK excluding London median daily rate £351 £275 £325
% change year-on-year +27.72% -15.38%  
Number of hourly rates quoted 0 0 0
Median hourly rate - - -
UK excluding London median hourly rate - £37.50 -

WebSockets is in the industry standards, technical specifications and software library and framework skills category. The next 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 industry standards, technical specifications and software library and framework skills.

Contract Software Library & Framework Skills
City of London
Contract job vacancies with a requirement for industry standards, technical specifications and software library and framework skills 1250 1176 1729
As % of all contract IT job vacancies advertised in the City of London 37.88% 34.75% 29.75%
Number of daily rates quoted 1019 1007 1404
Median daily rate £500 £450 £430
Median daily rate % change year-on-year +11.00% +4.65%  
90% offered a daily rate of more than £360 £325 £315
10% offered a daily rate of more than £625 £575 £600
UK excluding London median daily rate £400 £375 £350
% change year-on-year +6.66% +7.14%  
Number of hourly rates quoted 6 1 12
Median hourly rate £24.86 £20.00 £24.23
Median hourly rate % change year-on-year +24.30% -17.45%  
90% offered a hourly rate of more than £21.50 £20.00 £15.64
10% offered a hourly rate of more than £26.80 £20.00 £187.50
UK excluding London median hourly rate £42.50 £36.00 £40.00
% change year-on-year +18.05% -10.00%  

WebSockets
Job Vacancy Trend in the City of London

The job posting trend of jobs advertised in the City of London citing WebSockets as a proportion of all contract or permanent IT jobs with a match in the Libraries, Frameworks & Software Standards category.

Job vacancy trend for WebSockets in the City of London

WebSockets
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 WebSockets in the City of London.

Contractor daily rate trend for WebSockets in the City of London

For the 6 months to 23 June 2017, IT contractor jobs citing WebSockets 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 WebSockets.

1 13 (86.67%) JavaScript
2 11 (73.33%) AngularJS
3 9 (60.00%) Greenfield Project
3 9 (60.00%) Finance
4 8 (53.33%) HTML
4 8 (53.33%) HTML5
5 7 (46.67%) Agile Software Development
6 6 (40.00%) BDD
6 6 (40.00%) NoSQL
6 6 (40.00%) Redux
6 6 (40.00%) Akka
7 5 (33.33%) ASP.NET Web API
7 5 (33.33%) SignalR
7 5 (33.33%) CQRS
7 5 (33.33%) Kafka
7 5 (33.33%) Reactive Extensions
7 5 (33.33%) NServiceBus
7 5 (33.33%) SpecFlow
7 5 (33.33%) Angular 2
7 5 (33.33%) RabbitMQ
7 5 (33.33%) REST
7 5 (33.33%) MongoDB
7 5 (33.33%) Hedge funds
7 5 (33.33%) Complex Event Processing
7 5 (33.33%) Git (software)
7 5 (33.33%) Subversion
7 5 (33.33%) C#
7 5 (33.33%) .NET
7 5 (33.33%) ASP.NET
8 4 (26.67%) CSS

WebSockets
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 (33.33%) NServiceBus
2 1 (6.67%) Apache Spark
Communications & Networking
1 2 (13.33%) Internet
Database & Business Intelligence
1 6 (40.00%) NoSQL
2 5 (33.33%) MongoDB
3 2 (13.33%) Hadoop
4 1 (6.67%) Apache Cassandra
4 1 (6.67%) KDB
4 1 (6.67%) Neo4j
4 1 (6.67%) Redis
4 1 (6.67%) Relational Database
Development Applications
1 5 (33.33%) Git (software)
1 5 (33.33%) SpecFlow
1 5 (33.33%) Subversion
2 3 (20.00%) webpack
3 1 (6.67%) Bower
3 1 (6.67%) Grunt
3 1 (6.67%) Jasmine
3 1 (6.67%) JIRA
3 1 (6.67%) Protractor
3 1 (6.67%) Selenium
General
1 9 (60.00%) Finance
2 4 (26.67%) Banking
3 3 (20.00%) Front Office
4 2 (13.33%) Investment Banking
Job Titles
1 12 (80.00%) Developer
2 6 (40.00%) Full Stack Developer
3 5 (33.33%) Lead Developer
3 5 (33.33%) Technical Developer
3 5 (33.33%) Technical Leader
4 2 (13.33%) Angular Developer
4 2 (13.33%) Front End Developer (Client-Side Developer)
4 2 (13.33%) HTML Developer
4 2 (13.33%) JavaScript Developer
4 2 (13.33%) UI Developer
4 2 (13.33%) Web Developer
5 1 (6.67%) E-Commerce Engineer
5 1 (6.67%) Front End Web Developer (Client-Side Developer)
5 1 (6.67%) Front Office Developer
5 1 (6.67%) iOS Developer
5 1 (6.67%) Mobile Web Developer
5 1 (6.67%) Scala Developer
5 1 (6.67%) Senior Test Engineer
5 1 (6.67%) Test Engineer
Libraries, Frameworks & Software Standards
1 11 (73.33%) AngularJS
2 8 (53.33%) HTML
2 8 (53.33%) HTML5
3 6 (40.00%) Akka
3 6 (40.00%) Redux
4 5 (33.33%) .NET
4 5 (33.33%) Angular 2
4 5 (33.33%) ASP.NET
4 5 (33.33%) ASP.NET Web API
4 5 (33.33%) Kafka
4 5 (33.33%) RabbitMQ
4 5 (33.33%) Reactive Extensions
4 5 (33.33%) REST
4 5 (33.33%) SignalR
5 4 (26.67%) CSS
5 4 (26.67%) CSS3
6 3 (20.00%) Backbone.js
6 3 (20.00%) D3.js
6 3 (20.00%) jQuery
6 3 (20.00%) Node.js
Miscellaneous
1 9 (60.00%) Greenfield Project
2 5 (33.33%) Hedge funds
3 4 (26.67%) Foreign Exchange (FX)
4 3 (20.00%) Derivative
4 3 (20.00%) User Experience
5 2 (13.33%) Computer Science
5 2 (13.33%) Fixed Income
5 2 (13.33%) Mobile App
6 1 (6.67%) Equities
6 1 (6.67%) Fintech
Operating Systems
1 2 (13.33%) Apple iOS
Processes & Methodologies
1 7 (46.67%) Agile Software Development
2 6 (40.00%) BDD
3 5 (33.33%) Complex Event Processing
3 5 (33.33%) CQRS
4 4 (26.67%) Test Automation
5 3 (20.00%) Scrum
5 3 (20.00%) Web Development
6 2 (13.33%) E-Commerce
6 2 (13.33%) Electronic Trading
6 2 (13.33%) Front End Development
6 2 (13.33%) Open Source
6 2 (13.33%) SDLC
6 2 (13.33%) TDD
6 2 (13.33%) Web Application Development
6 2 (13.33%) Workflow
7 1 (6.67%) Automated Trading
7 1 (6.67%) Data Visualisation
7 1 (6.67%) Dependency Management
7 1 (6.67%) iOS Development
7 1 (6.67%) SDET
Programming Languages
1 13 (86.67%) JavaScript
2 5 (33.33%) C#
3 4 (26.67%) ES6
4 3 (20.00%) Java
5 1 (6.67%) PHP
5 1 (6.67%) Python
5 1 (6.67%) Scala
5 1 (6.67%) SQL
Qualifications
1 2 (13.33%) Computer Science Degree
1 2 (13.33%) Degree
Quality Assurance & Compliance
1 2 (13.33%) MiFID
System Software
1 2 (13.33%) HDFS
Vendors
1 1 (6.67%) Atlassian