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 30 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.

Test-Driven Development (TDD)
South East / Middlesex
3 months to
30 Mar 2017
Same period 2016 Same period 2015
Rank 10 15 20
Rank change year-on-year +5 +5  
Contract jobs citing TDD 10 10 3
As % of all contract IT jobs advertised in Middlesex 8.00% 6.29% 1.81%
As % of the Processes & Methodologies category 9.35% 7.46% 2.29%
Number of daily rates quoted 8 8 3
Median daily rate £363 £394 £275
Median daily rate % change year-on-year -7.93% +43.18%  
90% offered a daily rate of more than £300 £344 £271
10% offered a daily rate of more than £560 £413 £345
UK excluding London median daily rate £400 £400 £375
% change year-on-year - +6.66%  
Number of hourly rates quoted 0 0 0
Median hourly rate - - -
UK excluding London median hourly rate £39.00 £45.75 £39.25
% change year-on-year -14.75% +16.56%  

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 107 134 131
As % of all contract IT job vacancies advertised in Middlesex 85.60% 84.28% 78.92%
Number of daily rates quoted 68 97 81
Median daily rate £420 £405 £400
Median daily rate % change year-on-year +3.70% +1.25%  
90% offered a daily rate of more than £288 £315 £258
10% offered a daily rate of more than £560 £528 £495
UK excluding London median daily rate £410 £400 £396
% change year-on-year +2.50% +1.01%  
Number of hourly rates quoted 0 9 2
Median hourly rate - £48.50 £32.50
Median hourly rate % change year-on-year - +49.23%  
UK excluding London median hourly rate £35.75 £38.00 £30.00
% change year-on-year -5.92% +26.66%  

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

TDD
Contractor Daily Rate Histogram in Middlesex

The daily rate distribution of IT jobs citing TDD in Middlesex over the 3 months to 30 March 2017.

Contractor daily rate histogram for TDD in Middlesex

For the 6 months to 30 March 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 12 (80.00%) Agile Software Development
2 11 (73.33%) Scrum
3 8 (53.33%) REST
4 7 (46.67%) HTML5
4 7 (46.67%) Git (software)
4 7 (46.67%) HTML
5 6 (40.00%) SQL
5 6 (40.00%) C
5 6 (40.00%) Digital TV
5 6 (40.00%) DVB
5 6 (40.00%) C++
5 6 (40.00%) SOA
5 6 (40.00%) MPEG
5 6 (40.00%) HTTP
5 6 (40.00%) STB
5 6 (40.00%) Degree
5 6 (40.00%) Computer Science
5 6 (40.00%) NoSQL
5 6 (40.00%) Node.js
6 5 (33.33%) Software Architecture
6 5 (33.33%) Continuous Integration
6 5 (33.33%) User Stories
6 5 (33.33%) Continuous Deployment
7 4 (26.67%) BDD
7 4 (26.67%) Software Engineering
7 4 (26.67%) Java
8 3 (20.00%) JavaScript
8 3 (20.00%) Linux
8 3 (20.00%) Python
8 3 (20.00%) Kanban

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:

Cloud Services
1 3 (20.00%) Amazon AWS
Communications & Networking
1 6 (40.00%) DVB
1 6 (40.00%) HTTP
Database & Business Intelligence
1 6 (40.00%) NoSQL
2 1 (6.67%) Microsoft Analysis Services
2 1 (6.67%) SQL Server
2 1 (6.67%) SQL Server 2012
2 1 (6.67%) SQL Server Analysis Services
2 1 (6.67%) SQL Server Integration Services
2 1 (6.67%) SQL Server Reporting Services
Development Applications
1 7 (46.67%) Git (software)
2 2 (13.33%) JIRA
2 2 (13.33%) Talend Open Studio
3 1 (6.67%) Jenkins
3 1 (6.67%) Mockito
3 1 (6.67%) Team Foundation Server
3 1 (6.67%) Visual Studio
General
1 2 (13.33%) Retail
2 1 (6.67%) Telecoms
Job Titles
1 8 (53.33%) Developer
2 4 (26.67%) Java Developer
2 4 (26.67%) Software Engineer
3 3 (20.00%) Embedded Engineer
3 3 (20.00%) Integration Engineer
4 2 (13.33%) Analyst
4 2 (13.33%) Developer/Software Engineer
4 2 (13.33%) Embedded Software Engineer
4 2 (13.33%) Java Engineer
4 2 (13.33%) Java Software Developer
4 2 (13.33%) Java Software Engineer
4 2 (13.33%) JavaScript Developer
4 2 (13.33%) Senior Developer
4 2 (13.33%) Senior Java Developer
4 2 (13.33%) Senior Java Engineer
4 2 (13.33%) Senior Java Software Developer
4 2 (13.33%) Senior Java Software Engineer
4 2 (13.33%) Senior Software Developer
4 2 (13.33%) Senior Software Engineer
4 2 (13.33%) Test Analyst
Libraries, Frameworks & Software Standards
1 8 (53.33%) REST
2 7 (46.67%) HTML
2 7 (46.67%) HTML5
3 6 (40.00%) Node.js
4 2 (13.33%) AngularJS
4 2 (13.33%) CSS
4 2 (13.33%) Spring
4 2 (13.33%) Spring Security
5 1 (6.67%) .NET
5 1 (6.67%) ASP.NET
5 1 (6.67%) Backbone.js
5 1 (6.67%) CSS3
5 1 (6.67%) Ember.js
5 1 (6.67%) JMS
5 1 (6.67%) JSON
5 1 (6.67%) React
5 1 (6.67%) React Native
5 1 (6.67%) SOAP
5 1 (6.67%) Spring Boot
5 1 (6.67%) Spring MVC
Miscellaneous
1 6 (40.00%) Computer Science
1 6 (40.00%) Digital TV
1 6 (40.00%) MPEG
1 6 (40.00%) STB
2 1 (6.67%) Clustering
2 1 (6.67%) Smart Meter
Operating Systems
1 3 (20.00%) Linux
2 1 (6.67%) CentOS
2 1 (6.67%) Ubuntu
2 1 (6.67%) Windows
Processes & Methodologies
1 12 (80.00%) Agile Software Development
2 11 (73.33%) Scrum
3 6 (40.00%) SOA
4 5 (33.33%) Continuous Deployment
4 5 (33.33%) Continuous Integration
4 5 (33.33%) Software Architecture
4 5 (33.33%) User Stories
5 4 (26.67%) BDD
5 4 (26.67%) Software Engineering
6 3 (20.00%) Kanban
7 2 (13.33%) Data Migration
7 2 (13.33%) Defect Management
7 2 (13.33%) DevOps
7 2 (13.33%) Logistics
7 2 (13.33%) Microservices
7 2 (13.33%) Migration
7 2 (13.33%) MVC
7 2 (13.33%) Pair Programming
7 2 (13.33%) Test Planning
7 2 (13.33%) Unit Testing
Programming Languages
1 6 (40.00%) C
1 6 (40.00%) C++
1 6 (40.00%) SQL
2 4 (26.67%) Java
3 3 (20.00%) JavaScript
3 3 (20.00%) Python
4 1 (6.67%) Bash Shell
4 1 (6.67%) C#
4 1 (6.67%) Perl
Qualifications
1 6 (40.00%) Degree
Quality Assurance & Compliance
1 1 (6.67%) Data Quality
System Software
1 1 (6.67%) Active Directory
1 1 (6.67%) Docker
1 1 (6.67%) Virtual Machines
1 1 (6.67%) vSphere
Systems Management
1 1 (6.67%) Microsoft Clustering
Vendors
1 2 (13.33%) Citrix
1 2 (13.33%) HP
1 2 (13.33%) Talend
2 1 (6.67%) Oracle
2 1 (6.67%) SaltStack