The following table provides summary statistics for contract job vacancies 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 22 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)
UK
3 months to
22 Jun 2017
Same period 2016 Same period 2015
Rank 571 618 614
Rank change year-on-year +47 -4  
Contract jobs citing Reactive Extensions 44 27 29
As % of all contract IT jobs advertised in the UK 0.094% 0.050% 0.052%
As % of the Libraries, Frameworks & Software Standards category 0.29% 0.18% 0.19%
Number of daily rates quoted 37 24 18
Median daily rate £600 £613 £650
Median daily rate % change year-on-year -2.04% -5.76%  
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 with a requirement for industry standards, technical specifications and software library and framework skills.

Contract Software Library & Framework Skills
UK
Contract job vacancies with a requirement for industry standards, technical specifications and software library and framework skills 15082 15298 15416
As % of all contract IT job vacancies advertised in the UK 32.18% 28.37% 27.42%
Number of daily rates quoted 10422 10796 10312
Median daily rate £430 £420 £388
Median daily rate % change year-on-year +2.38% +8.38%  
90% offered a daily rate of more than £315 £300 £285
10% offered a daily rate of more than £580 £550 £550
UK excluding London median daily rate £400 £375 £350
% change year-on-year +6.66% +7.14%  
Number of hourly rates quoted 204 179 206
Median hourly rate £41.50 £36.00 £35.00
Median hourly rate % change year-on-year +15.27% +2.85%  
90% offered a hourly rate of more than £16.08 £16.00 £17.50
10% offered a hourly rate of more than £52.50 £50.00 £55.00
UK excluding London median hourly rate £42.50 £36.00 £38.89
% change year-on-year +18.05% -7.41%  

Reactive Extensions
Job Vacancy Trend

The job posting trend of jobs advertised 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 UK

Reactive Extensions
Contractor Daily Rate Trend

This chart provides the 3-month moving average for daily rates quoted in contract jobs citing Reactive Extensions.

Contractor daily rate trend for Reactive Extensions in the UK

Reactive Extensions
Contractor Daily Rate Histogram

The daily rate distribution of IT jobs citing Reactive Extensions over the 3 months to 22 June 2017.

Contractor daily rate histogram for Reactive Extensions in the UK

Reactive Extensions
Top 8 Contract Locations

The table below looks at the demand and provides a guide to the median contractor rates quoted in IT jobs citing Reactive Extensions within the UK over the 3 months to 22 June 2017. The 'Rank Change' column provides an indication of the change in demand within each location based on the same 3 month period last year.

Location Rank Change
on Same Period
Last Year
Matching
Contract
IT Job Ads
Median
Daily Rate
Last 3 Months
Median Daily Rate
% Change
on Same Period
Last Year
Live
Job
Vacancies
England +64 44 £600 -2.04% 6
London +35 41 £600 -2.04% 5
City of London 0 7 £530 -13.46% 1
South East +19 2 £538 +6.17%
Surrey +3 2 £538 +6.17%
Mayfair - 1 £800 -
West Midlands - 1 - -
Coventry - 1 - -

For the 6 months to 22 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 with a requirement for Reactive Extensions.

1 64 (88.89%) JavaScript
1 64 (88.89%) .NET
2 61 (84.72%) C#
3 59 (81.94%) Finance
4 52 (72.22%) AngularJS
5 46 (63.89%) React
5 46 (63.89%) Agile Software Development
6 39 (54.17%) ASP.NET Web API
7 38 (52.78%) SQL
8 37 (51.39%) Banking
9 36 (50.00%) HTML
9 36 (50.00%) NoSQL
10 35 (48.61%) HTML5
10 35 (48.61%) Front Office
11 34 (47.22%) WPF
12 33 (45.83%) MVVM
13 32 (44.44%) Greenfield Project
14 29 (40.28%) ASP.NET
15 27 (37.50%) Java
15 27 (37.50%) MongoDB
15 27 (37.50%) Git (software)
15 27 (37.50%) SignalR
16 25 (34.72%) BDD
17 24 (33.33%) WebSockets
17 24 (33.33%) SpecFlow
17 24 (33.33%) Subversion
17 24 (33.33%) Redux
18 23 (31.94%) TDD
18 23 (31.94%) NUnit
19 22 (30.56%) Foreign Exchange (FX)

Reactive Extensions
Co-occurring IT Skills 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 15 (20.83%) NServiceBus
2 11 (15.28%) Apache Spark
3 1 (1.39%) Elasticsearch
3 1 (1.39%) IIS
3 1 (1.39%) SharePoint
3 1 (1.39%) SharePoint 2013
3 1 (1.39%) WebSphere
Cloud Services
1 14 (19.44%) Microsoft Azure
2 1 (1.39%) Amazon AWS
2 1 (1.39%) SaaS
Communications & Networking
1 9 (12.50%) AMQP
2 1 (1.39%) TCP/IP
Database & Business Intelligence
1 36 (50.00%) NoSQL
2 27 (37.50%) MongoDB
3 21 (29.17%) Relational Database
4 14 (19.44%) Redis
5 13 (18.06%) Azure SQL Database
6 12 (16.67%) Big Data
7 11 (15.28%) SQL Server
8 2 (2.78%) Oracle Database
9 1 (1.39%) Apache Cassandra
9 1 (1.39%) Couchbase
9 1 (1.39%) CouchDB
9 1 (1.39%) Event Store
9 1 (1.39%) OLAP
9 1 (1.39%) Oracle Database 10g
9 1 (1.39%) RavenDB
Development Applications
1 27 (37.50%) Git (software)
2 24 (33.33%) SpecFlow
2 24 (33.33%) Subversion
3 23 (31.94%) NUnit
4 13 (18.06%) Maven
5 12 (16.67%) Gradle
6 11 (15.28%) Mockito
7 2 (2.78%) TeamCity
7 2 (2.78%) webpack
8 1 (1.39%) Jasmine
8 1 (1.39%) JSUnit
8 1 (1.39%) Karma Test Runner
8 1 (1.39%) NSubstitute
8 1 (1.39%) Rhino Mocks
8 1 (1.39%) Sonatype Nexus
General
1 59 (81.94%) Finance
2 37 (51.39%) Banking
3 35 (48.61%) Front Office
4 21 (29.17%) Investment Banking
5 5 (6.94%) Marketing
6 1 (1.39%) Back Office
6 1 (1.39%) Financial Institution
Job Titles
1 69 (95.83%) Developer
2 46 (63.89%) C# Developer
3 22 (30.56%) Full Stack Developer
4 21 (29.17%) Angular Developer
5 20 (27.78%) WPF Developer
6 19 (26.39%) C# WPF Developer
7 12 (16.67%) Web Developer
8 11 (15.28%) JavaScript Developer
8 11 (15.28%) Senior Developer
9 10 (13.89%) Applications Developer
9 10 (13.89%) C# Developer - Investment Banking
9 10 (13.89%) Silverlight Developer
9 10 (13.89%) Web Applications Developer
10 9 (12.50%) .NET Developer
10 9 (12.50%) C# .NET Developer
10 9 (12.50%) Senior Applications Developer
10 9 (12.50%) Senior Web Applications Developer
10 9 (12.50%) Senior Web Developer
11 8 (11.11%) Lead Developer
11 8 (11.11%) XAML Developer
Libraries, Frameworks & Software Standards
1 64 (88.89%) .NET
2 52 (72.22%) AngularJS
3 46 (63.89%) React
4 39 (54.17%) ASP.NET Web API
5 36 (50.00%) HTML
6 35 (48.61%) HTML5
7 34 (47.22%) WPF
8 29 (40.28%) ASP.NET
9 27 (37.50%) SignalR
10 24 (33.33%) Redux
10 24 (33.33%) WebSockets
11 22 (30.56%) Angular 2
12 20 (27.78%) NancyFx
13 15 (20.83%) Kafka
13 15 (20.83%) RabbitMQ
14 14 (19.44%) Akka
15 13 (18.06%) CSS
15 13 (18.06%) RESTful
16 11 (15.28%) CSS3
16 11 (15.28%) Spring
Miscellaneous
1 32 (44.44%) Greenfield Project
2 22 (30.56%) Foreign Exchange (FX)
3 20 (27.78%) Virtual Team
4 15 (20.83%) Hedge funds
5 13 (18.06%) User Experience
6 11 (15.28%) Computer Science
7 10 (13.89%) Fintech
8 2 (2.78%) Algorithms
8 2 (2.78%) Data Structures
8 2 (2.78%) Derivative
9 1 (1.39%) Client/Server
9 1 (1.39%) Credit Risk
9 1 (1.39%) Equities
9 1 (1.39%) Equity Derivative
9 1 (1.39%) Fixed Income
9 1 (1.39%) Market Risk
Operating Systems
1 1 (1.39%) Unix
1 1 (1.39%) Windows
1 1 (1.39%) Windows Server
1 1 (1.39%) Windows Server 2012
Processes & Methodologies
1 46 (63.89%) Agile Software Development
2 33 (45.83%) MVVM
3 25 (34.72%) BDD
4 23 (31.94%) TDD
5 22 (30.56%) Continuous Improvement
6 20 (27.78%) Software Engineering
7 18 (25.00%) Multithreading
8 17 (23.61%) Complex Event Processing
9 14 (19.44%) CQRS
10 13 (18.06%) Pair Programming
10 13 (18.06%) SDLC
11 12 (16.67%) Web Development
12 11 (15.28%) Continuous Integration
12 11 (15.28%) Open Source
12 11 (15.28%) Scrum
12 11 (15.28%) Technical Analysis
13 10 (13.89%) Algorithmic Trading
13 10 (13.89%) Economics
14 9 (12.50%) Microservices
15 7 (9.72%) Domain-Driven Design
Programming Languages
1 64 (88.89%) JavaScript
2 61 (84.72%) C#
3 38 (52.78%) SQL
4 27 (37.50%) Java
5 12 (16.67%) TypeScript
6 10 (13.89%) XAML
7 1 (1.39%) ES6
7 1 (1.39%) PowerShell
7 1 (1.39%) Python
7 1 (1.39%) T-SQL
Quality Assurance & Compliance
1 1 (1.39%) QA
System Software
1 1 (1.39%) Docker
Systems Management
1 1 (1.39%) Opscode Chef
1 1 (1.39%) Puppet
Vendors
1 20 (27.78%) Microsoft
2 2 (2.78%) Oracle
3 1 (1.39%) DevExpress
3 1 (1.39%) Google
3 1 (1.39%) IBM
3 1 (1.39%) Infragistics
3 1 (1.39%) Splunk