The following table provides summary statistics for contract job vacancies advertised in the City of London 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 24 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
24 Mar 2017
Same period 2016 Same period 2015
Inversion of Control (IoC)
London / City of London
Rank 149 147 186
Rank change year-on-year -2 +39  
Contract jobs citing Inversion of Control 4 11 3
As % of all contract IT jobs advertised in the City of London 0.13% 0.33% 0.059%
As % of the Processes & Methodologies category 0.15% 0.38% 0.072%
Number of daily rates quoted 3 10 3
Median daily rate £360 £263 £400
Median daily rate % change year-on-year +37.14% -34.37%  
UK excluding London median daily rate £378 £375 £404
% change year-on-year +0.66% -7.12%  
Number of hourly rates quoted 0 0 0
Median hourly rate - - -
UK excluding London median hourly rate £40.50 - -

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 City of London with a requirement for process and methodology skills.

Contract Process & Methodology Skills
City of London
Contract job vacancies with a requirement for process and methodology skills 2591 2891 4163
As % of all contract IT job vacancies advertised in the City of London 85.46% 87.77% 82.45%
Number of daily rates quoted 2034 2315 3208
Median daily rate £500 £475 £450
Median daily rate % change year-on-year +5.26% +5.55%  
90% offered a daily rate of more than £345 £325 £313
10% offered a daily rate of more than £625 £625 £625
UK excluding London median daily rate £410 £400 £400
% change year-on-year +2.50% -  
Number of hourly rates quoted 22 26 36
Median hourly rate £16.00 £20.00 £20.45
Median hourly rate % change year-on-year -19.97% -2.20%  
90% offered a hourly rate of more than £13.50 £13.00 £12.50
10% offered a hourly rate of more than £28.35 £47.50 £92.50
UK excluding London median hourly rate £36.00 £39.00 £30.00
% change year-on-year -7.69% +30.00%  

Inversion of Control
Job Vacancy Trend in the City of London

The job posting trend of jobs advertised in the City of London 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 City of London

Inversion of Control
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 Inversion of Control in the City of London.

Contractor daily rate trend for Inversion of Control in the City of London

Inversion of Control
Contractor Daily Rate Histogram in the City of London

The daily rate distribution of IT jobs citing Inversion of Control in the City of London over the 3 months to 24 March 2017.

Contractor daily rate histogram for Inversion of Control in the City of London

Inversion of Control
Top 30 Related IT Skills in the City of London

For the 6 months to 24 March 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 City of London region with a requirement for Inversion of Control.

1 11 (78.57%) TDD
1 11 (78.57%) Dependency Injection
2 10 (71.43%) REST
2 10 (71.43%) JSON
2 10 (71.43%) MVC
2 10 (71.43%) .NET
3 9 (64.29%) C#
3 9 (64.29%) Java
3 9 (64.29%) TIBCO
3 9 (64.29%) Finance
3 9 (64.29%) TIBCO EMS
3 9 (64.29%) Spring
3 9 (64.29%) Jenkins
3 9 (64.29%) Continuous Integration
4 8 (57.14%) JPA
4 8 (57.14%) Build Forge
4 8 (57.14%) Hudson
4 8 (57.14%) CruiseControl
4 8 (57.14%) Hibernate
4 8 (57.14%) Web Services
4 8 (57.14%) JSP
4 8 (57.14%) J2EE
5 6 (42.86%) .NET Framework
6 5 (35.71%) Agile Software Development
6 5 (35.71%) Banking
6 5 (35.71%) SQL
6 5 (35.71%) Spring Boot
7 4 (28.57%) Low Latency
7 4 (28.57%) Analytical Skills
7 4 (28.57%) Multithreading

Inversion of Control
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 3 (21.43%) Apache Spark
1 3 (21.43%) IIS
2 1 (7.14%) Tomcat
Cloud Services
1 3 (21.43%) Microsoft Azure
2 1 (7.14%) GitHub
Communications & Networking
1 2 (14.29%) HTTP
Database & Business Intelligence
1 3 (21.43%) Hadoop
2 2 (14.29%) SQL Server
3 1 (7.14%) MySQL
Development Applications
1 9 (64.29%) Jenkins
2 8 (57.14%) Build Forge
2 8 (57.14%) CruiseControl
2 8 (57.14%) Hudson
3 3 (21.43%) Team Foundation Server
4 2 (14.29%) NUnit
4 2 (14.29%) Visual Studio
5 1 (7.14%) Git (software)
5 1 (7.14%) Moq
5 1 (7.14%) ReSharper
5 1 (7.14%) Selenium
General
1 9 (64.29%) Finance
2 5 (35.71%) Banking
3 3 (21.43%) Front Office
Job Titles
1 12 (85.71%) Developer
2 9 (64.29%) Java Developer
3 5 (35.71%) C# Developer
3 5 (35.71%) Core Java Developer
3 5 (35.71%) Senior Developer
3 5 (35.71%) Senior Java Developer
4 4 (28.57%) .NET Developer
5 3 (21.43%) C# .NET Developer
5 3 (21.43%) Senior .NET Developer
5 3 (21.43%) Senior C# .NET Developer
5 3 (21.43%) Senior C# Developer
6 2 (14.29%) Architect
6 2 (14.29%) Front Office Developer
6 2 (14.29%) Low Latency Java Developer
7 1 (7.14%) .NET Architect
7 1 (7.14%) J2EE Developer
7 1 (7.14%) Senior J2EE Developer
7 1 (7.14%) Solutions Architect
7 1 (7.14%) SQL Developer
7 1 (7.14%) SQL Server Developer
Libraries, Frameworks & Software Standards
1 10 (71.43%) .NET
1 10 (71.43%) JSON
1 10 (71.43%) REST
2 9 (64.29%) Spring
2 9 (64.29%) TIBCO EMS
3 8 (57.14%) Hibernate
3 8 (57.14%) J2EE
3 8 (57.14%) JPA
3 8 (57.14%) JSP
3 8 (57.14%) Web Services
4 6 (42.86%) .NET Framework
5 5 (35.71%) Spring Boot
6 4 (28.57%) WPF
7 3 (21.43%) CSS
7 3 (21.43%) HTML
7 3 (21.43%) jQuery
8 2 (14.29%) SOAP
8 2 (14.29%) WCF
8 2 (14.29%) XML
8 2 (14.29%) XSD
Miscellaneous
1 4 (28.57%) Analytical Skills
2 3 (21.43%) Computer Science
2 3 (21.43%) Derivative
3 1 (7.14%) Foreign Exchange (FX)
Operating Systems
1 1 (7.14%) Windows
Processes & Methodologies
1 11 (78.57%) Dependency Injection
1 11 (78.57%) TDD
2 10 (71.43%) MVC
3 9 (64.29%) Continuous Integration
4 5 (35.71%) Agile Software Development
5 4 (28.57%) Low Latency
5 4 (28.57%) Multithreading
6 2 (14.29%) Asynchronous Programming
6 2 (14.29%) Mentoring
6 2 (14.29%) OO
6 2 (14.29%) Scrum
6 2 (14.29%) SOLID
6 2 (14.29%) Unit Testing
7 1 (7.14%) BDD
7 1 (7.14%) Electronic Trading
7 1 (7.14%) Memory Management
7 1 (7.14%) MVVM
7 1 (7.14%) OOD
7 1 (7.14%) SEO
7 1 (7.14%) Web Development
Programming Languages
1 9 (64.29%) C#
1 9 (64.29%) Java
2 5 (35.71%) SQL
3 4 (28.57%) JavaScript
4 3 (21.43%) Bash Shell
4 3 (21.43%) C
4 3 (21.43%) PowerShell
4 3 (21.43%) Python
4 3 (21.43%) T-SQL
4 3 (21.43%) VBA
5 1 (7.14%) VB
5 1 (7.14%) VB.NET
Qualifications
1 3 (21.43%) Degree
Quality Assurance & Compliance
1 2 (14.29%) QA
System Software
1 1 (7.14%) Docker
Systems Management
1 1 (7.14%) Kubernetes
1 1 (7.14%) Marathon
1 1 (7.14%) Mesos
Vendors
1 9 (64.29%) TIBCO
2 2 (14.29%) Microsoft