The following table provides summary statistics for contract job vacancies advertised in the West Midlands with a requirement for Inversion of Control skills. Included is a benchmarking guide to the contractor rates offered in vacancies that have cited Inversion of Control 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.

Inversion of Control (IoC)
England / West Midlands
3 months to
22 Jun 2017
Same period 2016 Same period 2015
Rank - 140 120
Contract jobs citing Inversion of Control 0 1 3
As % of all contract IT jobs advertised in the West Midlands - 0.033% 0.12%
As % of the Processes & Methodologies category - 0.040% 0.16%
Number of daily rates quoted 0 0 2
Median daily rate - - £263
UK excluding London median daily rate £345 £361 £325
% change year-on-year -4.49% +11.15%  
Number of hourly rates quoted 0 0 0
Median hourly rate - - -
UK excluding London median hourly rate - - -

Inversion of Control is in the process and methodology skills category. The next table is for comparison with the above and provides summary statistics for all contract job vacancies advertised in the West Midlands with a requirement for process and methodology skills.

Contract Process & Methodology Skills
West Midlands
Contract job vacancies with a requirement for process and methodology skills 1689 2489 1879
As % of all contract IT job vacancies advertised in the West Midlands 83.28% 82.75% 77.29%
Number of daily rates quoted 1004 1484 1183
Median daily rate £404 £400 £375
Median daily rate % change year-on-year +0.93% +6.66%  
90% offered a daily rate of more than £275 £250 £250
10% offered a daily rate of more than £550 £525 £500
UK excluding London median daily rate £415 £400 £385
% change year-on-year +3.75% +3.89%  
Number of hourly rates quoted 73 53 79
Median hourly rate £28.00 £25.00 £25.00
Median hourly rate % change year-on-year +12.00% -  
90% offered a hourly rate of more than £12.80 £13.00 £15.00
10% offered a hourly rate of more than £52.50 £42.15 £42.50
UK excluding London median hourly rate £33.50 £28.50 £30.00
% change year-on-year +17.54% -5.00%  

Inversion of Control
Job Vacancy Trend in the West Midlands

The job posting trend of jobs advertised in the West Midlands citing Inversion of Control as a proportion of all contract or permanent IT jobs with a match in the Processes & Methodologies category.

Job vacancy trend for Inversion of Control in the West Midlands

Inversion of Control
Contractor Daily Rate Trend in the West Midlands

This chart provides the 3-month moving average for daily rates quoted in contract jobs citing Inversion of Control in the West Midlands.

Contractor daily rate trend for Inversion of Control in the West Midlands

For the 6 months to 22 June 2017, IT contractor jobs citing Inversion of Control 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 West Midlands region with a requirement for Inversion of Control.

1 5 (100.00%) .NET
1 5 (100.00%) Agile Software Development
1 5 (100.00%) TDD
1 5 (100.00%) WCF
1 5 (100.00%) Microsoft Azure
1 5 (100.00%) BDD
2 4 (80.00%) MSTest
2 4 (80.00%) NServiceBus
2 4 (80.00%) SpecFlow
2 4 (80.00%) SOLID
2 4 (80.00%) Test Automation
2 4 (80.00%) Domain-Driven Design
2 4 (80.00%) Continuous Integration
2 4 (80.00%) NUnit
2 4 (80.00%) ReSharper
2 4 (80.00%) C#
2 4 (80.00%) Web Services
2 4 (80.00%) Microsoft
3 3 (60.00%) .NET Framework
3 3 (60.00%) NHibernate
3 3 (60.00%) PowerShell
3 3 (60.00%) MSBuild
3 3 (60.00%) YAGNI
3 3 (60.00%) ATDD
3 3 (60.00%) NuGet
3 3 (60.00%) Mentoring
3 3 (60.00%) User Experience
3 3 (60.00%) Don't repeat yourself (DRY)
3 3 (60.00%) NDepend
3 3 (60.00%) NCover

Inversion of Control
Co-occurring IT Skills in the West Midlands 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 4 (80.00%) NServiceBus
Cloud Services
1 5 (100.00%) Microsoft Azure
2 1 (20.00%) Amazon AWS
Database & Business Intelligence
1 1 (20.00%) SQL Server
Development Applications
1 4 (80.00%) MSTest
1 4 (80.00%) NUnit
1 4 (80.00%) ReSharper
1 4 (80.00%) SpecFlow
2 3 (60.00%) MSBuild
2 3 (60.00%) NCover
2 3 (60.00%) NDepend
2 3 (60.00%) NuGet
2 3 (60.00%) StyleCop
3 1 (20.00%) Team Foundation Server
3 1 (20.00%) Visual Studio
General
1 1 (20.00%) Retail
Job Titles
1 4 (80.00%) Developer
1 4 (80.00%) Senior Developer
2 3 (60.00%) .NET Developer
2 3 (60.00%) Azure Developer
2 3 (60.00%) Senior .NET Developer
3 1 (20.00%) Senior Software Engineer
3 1 (20.00%) Software Engineer
Libraries, Frameworks & Software Standards
1 5 (100.00%) .NET
1 5 (100.00%) WCF
2 4 (80.00%) Web Services
3 3 (60.00%) .NET Framework
3 3 (60.00%) Entity Framework
3 3 (60.00%) NHibernate
4 1 (20.00%) ASP.NET
4 1 (20.00%) jQuery
4 1 (20.00%) MSMQ
4 1 (20.00%) RabbitMQ
4 1 (20.00%) REST
Miscellaneous
1 3 (60.00%) User Experience
2 1 (20.00%) Fintech
Processes & Methodologies
1 5 (100.00%) Agile Software Development
1 5 (100.00%) BDD
1 5 (100.00%) TDD
2 4 (80.00%) Continuous Integration
2 4 (80.00%) Domain-Driven Design
2 4 (80.00%) SOLID
2 4 (80.00%) Test Automation
3 3 (60.00%) ATDD
3 3 (60.00%) Don't repeat yourself (DRY)
3 3 (60.00%) Mentoring
3 3 (60.00%) YAGNI
4 2 (40.00%) Pair Programming
5 1 (20.00%) CRM
5 1 (20.00%) Dependency Injection
5 1 (20.00%) Software Engineering
5 1 (20.00%) User Stories
5 1 (20.00%) Web Development
Programming Languages
1 4 (80.00%) C#
2 3 (60.00%) PowerShell
3 2 (40.00%) SQL
4 1 (20.00%) JavaScript
Vendors
1 4 (80.00%) Microsoft