The following table provides summary statistics for contract job vacancies advertised in 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)
England / London
3 months to
27 Jun 2017
Same period 2016 Same period 2015
Rank 391 409 415
Rank change year-on-year +18 +6  
Contract jobs citing Reactive Extensions 33 18 19
As % of all contract IT jobs advertised in London 0.16% 0.083% 0.082%
As % of the Libraries, Frameworks & Software Standards category 0.44% 0.25% 0.26%
Number of daily rates quoted 28 16 17
Median daily rate £600 £613 £650
Median daily rate % change year-on-year -2.04% -5.76%  
90% offered a daily rate of more than £544 £513 £565
10% offered a daily rate of more than £650 £638 £660
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 London with a requirement for industry standards, technical specifications and software library and framework skills.

Contract Software Library & Framework Skills
London
Contract job vacancies with a requirement for industry standards, technical specifications and software library and framework skills 7469 7068 7228
As % of all contract IT job vacancies advertised in London 35.88% 32.45% 31.38%
Number of daily rates quoted 5550 5424 5248
Median daily rate £475 £450 £425
Median daily rate % change year-on-year +5.55% +5.88%  
90% offered a daily rate of more than £350 £325 £310
10% offered a daily rate of more than £600 £600 £575
UK excluding London median daily rate £400 £375 £350
% change year-on-year +6.66% +7.14%  
Number of hourly rates quoted 50 25 49
Median hourly rate £31.00 £40.00 £22.50
Median hourly rate % change year-on-year -22.50% +77.77%  
90% offered a hourly rate of more than £16.00 £20.00 £16.09
10% offered a hourly rate of more than £55.00 £190.00 £60.00
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 London

The job posting trend of jobs advertised in 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 London

Reactive Extensions
Contractor Daily Rate Trend in London

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

Contractor daily rate trend for Reactive Extensions in London

Reactive Extensions
Contractor Daily Rate Histogram in London

The daily rate distribution of IT jobs citing Reactive Extensions in London over the 3 months to 27 June 2017.

Contractor daily rate histogram for Reactive Extensions in London

Reactive Extensions
Contract Job Locations in London

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 London region over the 3 months to 27 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
City of London -5 5 £530 -13.46% 1
Mayfair - 1 £800 -
Reactive Extensions
England

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 London region with a requirement for Reactive Extensions.

1 58 (89.23%) JavaScript
1 58 (89.23%) .NET
2 55 (84.62%) C#
2 55 (84.62%) Finance
3 46 (70.77%) AngularJS
4 45 (69.23%) Agile Software Development
5 42 (64.62%) React
6 35 (53.85%) Front Office
7 34 (52.31%) HTML
7 34 (52.31%) SQL
7 34 (52.31%) Banking
7 34 (52.31%) NoSQL
7 34 (52.31%) ASP.NET Web API
8 33 (50.77%) HTML5
8 33 (50.77%) WPF
9 32 (49.23%) MVVM
10 28 (43.08%) Greenfield Project
11 27 (41.54%) MongoDB
11 27 (41.54%) Java
12 26 (40.00%) Git (software)
13 25 (38.46%) ASP.NET
14 24 (36.92%) BDD
14 24 (36.92%) Redux
15 23 (35.38%) WebSockets
15 23 (35.38%) SignalR
15 23 (35.38%) SpecFlow
15 23 (35.38%) Subversion
15 23 (35.38%) NUnit
16 22 (33.85%) Foreign Exchange (FX)
16 22 (33.85%) Continuous Improvement

Reactive Extensions
Co-occurring IT Skills in 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 14 (21.54%) NServiceBus
2 11 (16.92%) Apache Spark
3 1 (1.54%) Elasticsearch
3 1 (1.54%) SharePoint
3 1 (1.54%) SharePoint 2013
3 1 (1.54%) WebSphere
Cloud Services
1 9 (13.85%) Microsoft Azure
Communications & Networking
1 8 (12.31%) AMQP
2 1 (1.54%) TCP/IP
Database & Business Intelligence
1 34 (52.31%) NoSQL
2 27 (41.54%) MongoDB
3 21 (32.31%) Relational Database
4 13 (20.00%) Redis
5 12 (18.46%) Big Data
6 9 (13.85%) Azure SQL Database
6 9 (13.85%) SQL Server
7 2 (3.08%) Oracle Database
8 1 (1.54%) OLAP
8 1 (1.54%) Oracle Database 10g
Development Applications
1 26 (40.00%) Git (software)
2 23 (35.38%) NUnit
2 23 (35.38%) SpecFlow
2 23 (35.38%) Subversion
3 13 (20.00%) Maven
4 12 (18.46%) Gradle
5 11 (16.92%) Mockito
6 1 (1.54%) NSubstitute
6 1 (1.54%) Rhino Mocks
6 1 (1.54%) Sonatype Nexus
6 1 (1.54%) TeamCity
6 1 (1.54%) webpack
General
1 55 (84.62%) Finance
2 35 (53.85%) Front Office
3 34 (52.31%) Banking
4 21 (32.31%) Investment Banking
5 5 (7.69%) Marketing
6 1 (1.54%) Back Office
6 1 (1.54%) Financial Institution
Job Titles
1 62 (95.38%) Developer
2 41 (63.08%) C# Developer
3 19 (29.23%) Angular Developer
3 19 (29.23%) Full Stack Developer
3 19 (29.23%) WPF Developer
4 18 (27.69%) C# WPF Developer
5 12 (18.46%) Web Developer
6 11 (16.92%) JavaScript Developer
6 11 (16.92%) Senior Developer
7 10 (15.38%) Applications Developer
7 10 (15.38%) C# Developer - Investment Banking
7 10 (15.38%) Silverlight Developer
7 10 (15.38%) Web Applications Developer
8 9 (13.85%) Senior Applications Developer
8 9 (13.85%) Senior Web Applications Developer
8 9 (13.85%) Senior Web Developer
9 8 (12.31%) Lead Developer
9 8 (12.31%) XAML Developer
10 7 (10.77%) .NET Developer
10 7 (10.77%) C# .NET Developer
Libraries, Frameworks & Software Standards
1 58 (89.23%) .NET
2 46 (70.77%) AngularJS
3 42 (64.62%) React
4 34 (52.31%) ASP.NET Web API
4 34 (52.31%) HTML
5 33 (50.77%) HTML5
5 33 (50.77%) WPF
6 25 (38.46%) ASP.NET
7 24 (36.92%) Redux
8 23 (35.38%) SignalR
8 23 (35.38%) WebSockets
9 20 (30.77%) Angular 2
10 19 (29.23%) NancyFx
11 15 (23.08%) Kafka
11 15 (23.08%) RabbitMQ
12 14 (21.54%) Akka
13 13 (20.00%) RESTful
14 11 (16.92%) CSS
14 11 (16.92%) Spring
14 11 (16.92%) Spring Boot
Miscellaneous
1 28 (43.08%) Greenfield Project
2 22 (33.85%) Foreign Exchange (FX)
3 20 (30.77%) Virtual Team
4 15 (23.08%) Hedge funds
5 12 (18.46%) User Experience
6 11 (16.92%) Computer Science
7 9 (13.85%) Fintech
8 2 (3.08%) Algorithms
8 2 (3.08%) Data Structures
8 2 (3.08%) Derivative
9 1 (1.54%) Client/Server
9 1 (1.54%) Credit Risk
9 1 (1.54%) Equities
9 1 (1.54%) Equity Derivative
9 1 (1.54%) Fixed Income
9 1 (1.54%) Market Risk
Operating Systems
1 1 (1.54%) Unix
Processes & Methodologies
1 45 (69.23%) Agile Software Development
2 32 (49.23%) MVVM
3 24 (36.92%) BDD
4 22 (33.85%) Continuous Improvement
5 21 (32.31%) TDD
6 19 (29.23%) Software Engineering
7 18 (27.69%) Multithreading
8 14 (21.54%) Complex Event Processing
8 14 (21.54%) CQRS
9 13 (20.00%) Pair Programming
9 13 (20.00%) SDLC
10 12 (18.46%) Web Development
11 11 (16.92%) Continuous Integration
11 11 (16.92%) Open Source
11 11 (16.92%) Technical Analysis
12 10 (15.38%) Algorithmic Trading
12 10 (15.38%) Economics
12 10 (15.38%) Scrum
13 8 (12.31%) Microservices
14 5 (7.69%) Domain-Driven Design
Programming Languages
1 58 (89.23%) JavaScript
2 55 (84.62%) C#
3 34 (52.31%) SQL
4 27 (41.54%) Java
5 11 (16.92%) TypeScript
6 10 (15.38%) XAML
7 1 (1.54%) ES6
7 1 (1.54%) Python
Quality Assurance & Compliance
1 1 (1.54%) QA
Vendors
1 19 (29.23%) Microsoft
2 2 (3.08%) Oracle
3 1 (1.54%) DevExpress
3 1 (1.54%) Google
3 1 (1.54%) IBM
3 1 (1.54%) Infragistics
3 1 (1.54%) Splunk