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 27 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.

Reactive Extensions for .NET (Rx.NET)
London / City of London
3 months to
27 Jun 2017
Same period 2016 Same period 2015
Rank 159 154 192
Rank change year-on-year -5 +38  
Contract jobs citing Reactive Extensions 5 9 9
As % of all contract IT jobs advertised in the City of London 0.15% 0.27% 0.16%
As % of the Libraries, Frameworks & Software Standards category 0.40% 0.76% 0.53%
Number of daily rates quoted 3 9 8
Median daily rate £530 £613 £638
Median daily rate % change year-on-year -13.46% -3.92%  
UK excluding London median daily rate £538 £488 £400
% change year-on-year +10.25% +21.87%  
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 1252 1181 1708
As % of all contract IT job vacancies advertised in the City of London 37.89% 34.87% 29.77%
Number of daily rates quoted 1019 1014 1376
Median daily rate £500 £450 £425
Median daily rate % change year-on-year +11.00% +5.88%  
90% offered a daily rate of more than £363 £325 £318
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 5 1 11
Median hourly rate £24.36 £20.00 £24.23
Median hourly rate % change year-on-year +21.80% -17.45%  
90% offered a hourly rate of more than £21.50 £20.00 £15.64
10% offered a hourly rate of more than £24.86 £20.00 £187.50
UK excluding London median hourly rate £42.50 £36.00 £40.00
% change year-on-year +18.05% -10.00%  

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

For the 6 months to 27 June 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
1 9 (100.00%) Finance
2 8 (88.89%) Agile Software Development
2 8 (88.89%) AngularJS
3 7 (77.78%) NoSQL
3 7 (77.78%) Git (software)
3 7 (77.78%) .NET
3 7 (77.78%) ASP.NET
4 6 (66.67%) Subversion
4 6 (66.67%) Hedge funds
4 6 (66.67%) Complex Event Processing
4 6 (66.67%) BDD
4 6 (66.67%) MongoDB
4 6 (66.67%) SignalR
4 6 (66.67%) Akka
4 6 (66.67%) ASP.NET Web API
4 6 (66.67%) SpecFlow
4 6 (66.67%) Kafka
4 6 (66.67%) Redux
4 6 (66.67%) Greenfield Project
5 5 (55.56%) Angular 2
5 5 (55.56%) CQRS
5 5 (55.56%) RabbitMQ
5 5 (55.56%) WebSockets
5 5 (55.56%) NServiceBus
6 3 (33.33%) SQL
6 3 (33.33%) React
7 2 (22.22%) Fund Management
7 2 (22.22%) Multithreading

Reactive Extensions
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 (55.56%) NServiceBus
Cloud Services
1 1 (11.11%) Microsoft Azure
Database & Business Intelligence
1 7 (77.78%) NoSQL
2 6 (66.67%) MongoDB
3 1 (11.11%) Azure SQL Database
Development Applications
1 7 (77.78%) Git (software)
2 6 (66.67%) SpecFlow
2 6 (66.67%) Subversion
General
1 9 (100.00%) Finance
2 2 (22.22%) Banking
Job Titles
1 9 (100.00%) Developer
1 9 (100.00%) Full Stack Developer
2 5 (55.56%) Lead Developer
2 5 (55.56%) Technical Developer
2 5 (55.56%) Technical Leader
3 1 (11.11%) C# Developer
Libraries, Frameworks & Software Standards
1 8 (88.89%) AngularJS
2 7 (77.78%) .NET
2 7 (77.78%) ASP.NET
3 6 (66.67%) Akka
3 6 (66.67%) ASP.NET Web API
3 6 (66.67%) Kafka
3 6 (66.67%) Redux
3 6 (66.67%) SignalR
4 5 (55.56%) Angular 2
4 5 (55.56%) RabbitMQ
4 5 (55.56%) WebSockets
5 3 (33.33%) React
6 1 (11.11%) ASP.NET MVC
6 1 (11.11%) KnockoutJS
Miscellaneous
1 6 (66.67%) Greenfield Project
1 6 (66.67%) Hedge funds
Processes & Methodologies
1 8 (88.89%) Agile Software Development
2 6 (66.67%) BDD
2 6 (66.67%) Complex Event Processing
3 5 (55.56%) CQRS
4 2 (22.22%) Fund Management
4 2 (22.22%) Multithreading
5 1 (11.11%) MVC
Programming Languages
1 9 (100.00%) C#
1 9 (100.00%) JavaScript
2 3 (33.33%) SQL