The following table provides summary statistics for contract job vacancies advertised in the City of London with a requirement for Reactive Extensions skills. Included is a benchmarking guide to the contractor rates offered in vacancies that have cited Reactive Extensions over the 3 months to 26 March 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.

3 months to
26 Mar 2017
Same period 2016 Same period 2015
Reactive Extensions (Rx)
London / City of London
Rank 150 145 189
Rank change year-on-year -5 +44  
Contract jobs citing Reactive Extensions 4 13 6
As % of all contract IT jobs advertised in the City of London 0.13% 0.39% 0.12%
As % of the Libraries, Frameworks & Software Standards category 0.38% 1.19% 0.39%
Number of daily rates quoted 4 13 4
Median daily rate £525 £620 £613
Median daily rate % change year-on-year -15.32% +1.22%  
90% offered a daily rate of more than £454 £613 £583
10% offered a daily rate of more than £530 £675 £625
UK excluding London median daily rate £450 £475 £344
% change year-on-year -5.26% +38.18%  
Number of hourly rates quoted 0 0 0
Median hourly rate - - -
UK excluding London median hourly rate - - -

Reactive Extensions 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 1049 1091 1530
As % of all contract IT job vacancies advertised in the City of London 35.04% 32.79% 30.00%
Number of daily rates quoted 867 918 1224
Median daily rate £475 £463 £425
Median daily rate % change year-on-year +2.70% +8.82%  
90% offered a daily rate of more than £338 £325 £313
10% offered a daily rate of more than £625 £600 £580
UK excluding London median daily rate £375 £363 £350
% change year-on-year +3.44% +3.57%  
Number of hourly rates quoted 2 5 7
Median hourly rate £35.00 £55.00 £27.37
Median hourly rate % change year-on-year -36.36% +100.94%  
UK excluding London median hourly rate £40.00 £38.00 £36.00
% change year-on-year +5.26% +5.55%  

Reactive Extensions
Job Vacancy Trend in the City of London

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

Job vacancy trend for Reactive Extensions in the City of London

Reactive Extensions
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 Reactive Extensions in the City of London.

Contractor daily rate trend for Reactive Extensions in the City of London

Reactive Extensions
Top 30 Related IT Skills in the City of London

For the 6 months to 26 March 2017, IT contractor jobs citing Reactive Extensions 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 Reactive Extensions.

1 9 (100.00%) C#
1 9 (100.00%) JavaScript
2 8 (88.89%) Finance
2 8 (88.89%) AngularJS
3 6 (66.67%) React
3 6 (66.67%) .NET
4 5 (55.56%) ASP.NET
4 5 (55.56%) ASP.NET Web API
5 4 (44.44%) NancyFx
5 4 (44.44%) SignalR
5 4 (44.44%) Multithreading
5 4 (44.44%) Complex Event Processing
5 4 (44.44%) Java
5 4 (44.44%) Agile Software Development
5 4 (44.44%) Git (software)
5 4 (44.44%) RESTful
6 3 (33.33%) Subversion
6 3 (33.33%) SQL
6 3 (33.33%) BDD
6 3 (33.33%) MongoDB
6 3 (33.33%) Hedge funds
6 3 (33.33%) SpecFlow
6 3 (33.33%) Akka
6 3 (33.33%) Kafka
6 3 (33.33%) Redux
7 2 (22.22%) Angular 2
7 2 (22.22%) CQRS
7 2 (22.22%) Banking
7 2 (22.22%) NoSQL
7 2 (22.22%) Azure SQL Database

Reactive Extensions
Top Related 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 2 (22.22%) NServiceBus
2 1 (11.11%) Apache Spark
Cloud Services
1 2 (22.22%) Microsoft Azure
Database & Business Intelligence
1 3 (33.33%) MongoDB
2 2 (22.22%) Azure SQL Database
2 2 (22.22%) NoSQL
3 1 (11.11%) Big Data
Development Applications
1 4 (44.44%) Git (software)
2 3 (33.33%) SpecFlow
2 3 (33.33%) Subversion
3 1 (11.11%) Gradle
3 1 (11.11%) Maven
3 1 (11.11%) Mockito
3 1 (11.11%) NUnit
General
1 8 (88.89%) Finance
2 2 (22.22%) Banking
3 1 (11.11%) Front Office
3 1 (11.11%) Investment Banking
Job Titles
1 9 (100.00%) Developer
2 6 (66.67%) Full Stack Developer
3 4 (44.44%) Senior Developer
4 3 (33.33%) Senior UI Developer
4 3 (33.33%) UI Developer
5 2 (22.22%) C# Developer
5 2 (22.22%) Lead Developer
5 2 (22.22%) Technical Developer
5 2 (22.22%) Technical Leader
6 1 (11.11%) Java Developer
6 1 (11.11%) Senior Full Stack Developer
6 1 (11.11%) Senior Java Developer
Libraries, Frameworks & Software Standards
1 8 (88.89%) AngularJS
2 6 (66.67%) .NET
2 6 (66.67%) React
3 5 (55.56%) ASP.NET
3 5 (55.56%) ASP.NET Web API
4 4 (44.44%) NancyFx
4 4 (44.44%) RESTful
4 4 (44.44%) SignalR
5 3 (33.33%) Akka
5 3 (33.33%) Kafka
5 3 (33.33%) Redux
6 2 (22.22%) Angular 2
6 2 (22.22%) ASP.NET MVC
6 2 (22.22%) KnockoutJS
6 2 (22.22%) RabbitMQ
6 2 (22.22%) WebSockets
7 1 (11.11%) HTML
7 1 (11.11%) HTML5
7 1 (11.11%) Spring
7 1 (11.11%) WPF
Miscellaneous
1 3 (33.33%) Hedge funds
2 1 (11.11%) Foreign Exchange (FX)
Processes & Methodologies
1 4 (44.44%) Agile Software Development
1 4 (44.44%) Complex Event Processing
1 4 (44.44%) Multithreading
2 3 (33.33%) BDD
3 2 (22.22%) CQRS
3 2 (22.22%) MVC
4 1 (11.11%) MVVM
4 1 (11.11%) Software Engineering
Programming Languages
1 9 (100.00%) C#
1 9 (100.00%) JavaScript
2 4 (44.44%) Java
3 3 (33.33%) SQL