The following table provides summary statistics for contract job vacancies advertised in Middlesex with a requirement for TDD skills. Included is a benchmarking guide to the contractor rates offered in vacancies that have cited TDD over the 3 months to 26 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.

Test-Driven Development (TDD)
South East / Middlesex
3 months to
26 Jun 2017
Same period 2016 Same period 2015
Rank 10 19 19
Rank change year-on-year +9 0  
Contract jobs citing TDD 7 8 5
As % of all contract IT jobs advertised in Middlesex 7.61% 4.62% 2.69%
As % of the Processes & Methodologies category 8.75% 5.13% 3.60%
Number of daily rates quoted 6 1 0
Median daily rate £500 £360 -
Median daily rate % change year-on-year +38.88% -  
UK excluding London median daily rate £420 £413 £375
% change year-on-year +1.81% +10.00%  
Number of hourly rates quoted 0 1 0
Median hourly rate - £45.00 -
UK excluding London median hourly rate £41.50 £40.00 £43.75
% change year-on-year +3.75% -8.57%  

TDD 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 Middlesex with a requirement for process and methodology skills.

Contract Process & Methodology Skills
Middlesex
Contract job vacancies with a requirement for process and methodology skills 80 156 139
As % of all contract IT job vacancies advertised in Middlesex 86.96% 90.17% 74.73%
Number of daily rates quoted 52 102 72
Median daily rate £457 £400 £387
Median daily rate % change year-on-year +14.25% +3.35%  
90% offered a daily rate of more than £275 £300 £275
10% offered a daily rate of more than £525 £529 £484
UK excluding London median daily rate £415 £400 £380
% change year-on-year +3.75% +5.26%  
Number of hourly rates quoted 1 3 3
Median hourly rate £43.00 £45.00 £45.00
Median hourly rate % change year-on-year -4.44% -  
UK excluding London median hourly rate £34.00 £28.50 £30.00
% change year-on-year +19.29% -5.00%  

TDD
Job Vacancy Trend in Middlesex

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

Job vacancy trend for TDD in Middlesex

TDD
Contractor Daily Rate Trend in Middlesex

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

Contractor daily rate trend for TDD in Middlesex

For the 6 months to 26 June 2017, IT contractor jobs citing TDD 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 Middlesex region with a requirement for TDD.

1 13 (76.47%) Agile Software Development
2 8 (47.06%) Java
2 8 (47.06%) Continuous Integration
2 8 (47.06%) Amazon AWS
3 7 (41.18%) NoSQL
3 7 (41.18%) Scrum
4 6 (35.29%) OO
4 6 (35.29%) Python
5 5 (29.41%) Tomcat
5 5 (29.41%) WebLogic
5 5 (29.41%) JavaScript
5 5 (29.41%) MySQL
5 5 (29.41%) Oracle
5 5 (29.41%) PostgreSQL
5 5 (29.41%) NUnit
5 5 (29.41%) WebSphere
5 5 (29.41%) BDD
5 5 (29.41%) Puppet
5 5 (29.41%) MSTest
5 5 (29.41%) OpenStack
5 5 (29.41%) Microsoft Azure
5 5 (29.41%) Git (software)
5 5 (29.41%) Opscode Chef
5 5 (29.41%) Ansible
6 4 (23.53%) REST
6 4 (23.53%) HTML5
6 4 (23.53%) HTML
6 4 (23.53%) MVC
6 4 (23.53%) CSS
7 3 (17.65%) Degree

TDD
Co-occurring IT Skills in Middlesex 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 (29.41%) OpenStack
1 5 (29.41%) Tomcat
1 5 (29.41%) WebLogic
1 5 (29.41%) WebSphere
Cloud Services
1 8 (47.06%) Amazon AWS
2 5 (29.41%) Microsoft Azure
Communications & Networking
1 2 (11.76%) DVB
1 2 (11.76%) HTTP
Database & Business Intelligence
1 7 (41.18%) NoSQL
2 5 (29.41%) MySQL
2 5 (29.41%) PostgreSQL
3 2 (11.76%) Microsoft Analysis Services
3 2 (11.76%) SQL Server
3 2 (11.76%) SQL Server 2012
3 2 (11.76%) SQL Server Analysis Services
3 2 (11.76%) SQL Server Integration Services
3 2 (11.76%) SQL Server Reporting Services
Development Applications
1 5 (29.41%) Git (software)
1 5 (29.41%) MSTest
1 5 (29.41%) NUnit
2 2 (11.76%) JIRA
2 2 (11.76%) Talend Open Studio
2 2 (11.76%) Team Foundation Server
2 2 (11.76%) Visual Studio
3 1 (5.88%) Jasmine
3 1 (5.88%) Mockito
General
1 2 (11.76%) Retail
Job Titles
1 14 (82.35%) Developer
2 8 (47.06%) Java Developer
3 3 (17.65%) JavaScript Developer
4 2 (11.76%) .NET Developer
4 2 (11.76%) Analyst
4 2 (11.76%) Database Developer
4 2 (11.76%) Developer/Software Engineer
4 2 (11.76%) Java Engineer
4 2 (11.76%) Java Software Engineer
4 2 (11.76%) Senior Developer
4 2 (11.76%) Senior Java Engineer
4 2 (11.76%) Senior Software Developer
4 2 (11.76%) Senior Software Engineer
4 2 (11.76%) SQL Database Developer
4 2 (11.76%) SQL Developer
4 2 (11.76%) SQL Server Developer
4 2 (11.76%) SSAS Developer
4 2 (11.76%) SSIS Developer
4 2 (11.76%) SSRS Developer
4 2 (11.76%) Test Analyst
Libraries, Frameworks & Software Standards
1 4 (23.53%) CSS
1 4 (23.53%) HTML
1 4 (23.53%) HTML5
1 4 (23.53%) REST
2 3 (17.65%) AngularJS
2 3 (17.65%) Node.js
3 2 (11.76%) .NET
3 2 (11.76%) ASP.NET
3 2 (11.76%) ASP.NET MVC
3 2 (11.76%) CSS3
3 2 (11.76%) React
4 1 (5.88%) Backbone.js
4 1 (5.88%) Ember.js
4 1 (5.88%) JMS
4 1 (5.88%) JSON
4 1 (5.88%) React Native
4 1 (5.88%) RESTful
4 1 (5.88%) SOAP
4 1 (5.88%) Spring
4 1 (5.88%) Spring Boot
Miscellaneous
1 2 (11.76%) Clustering
1 2 (11.76%) Computer Science
1 2 (11.76%) Digital TV
1 2 (11.76%) MPEG
1 2 (11.76%) STB
2 1 (5.88%) Analytical Skills
2 1 (5.88%) Smart Meter
Operating Systems
1 2 (11.76%) Linux
1 2 (11.76%) Windows
Processes & Methodologies
1 13 (76.47%) Agile Software Development
2 8 (47.06%) Continuous Integration
3 7 (41.18%) Scrum
4 6 (35.29%) OO
5 5 (29.41%) BDD
6 4 (23.53%) MVC
7 3 (17.65%) Kanban
7 3 (17.65%) Pair Programming
7 3 (17.65%) Unit Testing
8 2 (11.76%) Analytics
8 2 (11.76%) Continuous Deployment
8 2 (11.76%) Data Migration
8 2 (11.76%) Defect Management
8 2 (11.76%) DevOps
8 2 (11.76%) Front End Development
8 2 (11.76%) Microservices
8 2 (11.76%) Scenario Testing
8 2 (11.76%) Software Architecture
8 2 (11.76%) Test Planning
8 2 (11.76%) User Stories
Programming Languages
1 8 (47.06%) Java
2 6 (35.29%) Python
3 5 (29.41%) JavaScript
4 2 (11.76%) C
4 2 (11.76%) C#
4 2 (11.76%) C++
4 2 (11.76%) SQL
Qualifications
1 3 (17.65%) Degree
Quality Assurance & Compliance
1 2 (11.76%) Data Quality
System Software
1 2 (11.76%) Active Directory
Systems Management
1 5 (29.41%) Ansible
1 5 (29.41%) Opscode Chef
1 5 (29.41%) Puppet
2 2 (11.76%) Microsoft Clustering
Vendors
1 5 (29.41%) Oracle
2 2 (11.76%) Citrix
2 2 (11.76%) HP
2 2 (11.76%) Talend