The following table provides summary statistics for contract job vacancies advertised in Cardiff 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 25 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
25 Mar 2017
Same period 2016 Same period 2015
Test-Driven Development (TDD)
South Wales / Cardiff
Rank 28 7 32
Rank change year-on-year -21 +25  
Contract jobs citing TDD 13 74 8
As % of all contract IT jobs advertised in Cardiff 3.82% 17.75% 3.05%
As % of the Processes & Methodologies category 4.42% 20.61% 3.88%
Number of daily rates quoted 10 61 4
Median daily rate £400 £375 £350
Median daily rate % change year-on-year +6.66% +7.14%  
90% offered a daily rate of more than £343 £330 £325
10% offered a daily rate of more than £505 £450 £393
UK excluding London median daily rate £405 £400 £375
% change year-on-year +1.25% +6.66%  
Number of hourly rates quoted 0 0 1
Median hourly rate - - £32.50
UK excluding London median hourly rate £39.00 £45.75 £36.00
% change year-on-year -14.75% +27.08%  

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 Cardiff with a requirement for process and methodology skills.

Contract Process & Methodology Skills
Cardiff
Contract job vacancies with a requirement for process and methodology skills 294 359 206
As % of all contract IT job vacancies advertised in Cardiff 86.47% 86.09% 78.63%
Number of daily rates quoted 243 257 154
Median daily rate £375 £375 £375
90% offered a daily rate of more than £186 £275 £235
10% offered a daily rate of more than £525 £450 £495
UK excluding London median daily rate £410 £400 £400
% change year-on-year +2.50% +0.06%  
Number of hourly rates quoted 7 11 10
Median hourly rate £26.00 £13.00 £17.83
Median hourly rate % change year-on-year +100.00% -27.06%  
90% offered a hourly rate of more than £15.10 £13.00 £13.00
10% offered a hourly rate of more than £33.25 £19.63 £32.50
UK excluding London median hourly rate £36.00 £38.75 £30.00
% change year-on-year -7.09% +29.16%  

TDD
Job Vacancy Trend in Cardiff

The job posting trend of jobs advertised in Cardiff 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 Cardiff

TDD
Contractor Daily Rate Trend in Cardiff

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

Contractor daily rate trend for TDD in Cardiff

TDD
Contractor Daily Rate Histogram in Cardiff

The daily rate distribution of IT jobs citing TDD in Cardiff over the 3 months to 25 March 2017.

Contractor daily rate histogram for TDD in Cardiff

TDD
Top 30 Related IT Skills in Cardiff

For the 6 months to 25 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 Cardiff region with a requirement for TDD.

1 24 (75.00%) Agile Software Development
2 18 (56.25%) BDD
3 13 (40.63%) Java
4 12 (37.50%) JavaScript
5 11 (34.38%) HTML
5 11 (34.38%) CSS
6 10 (31.25%) AngularJS
7 9 (28.13%) Scrum
8 7 (21.88%) Automated Testing
8 7 (21.88%) HTML5
8 7 (21.88%) CSS3
9 6 (18.75%) Scala
9 6 (18.75%) RESTful
9 6 (18.75%) Big Data
10 5 (15.63%) DevOps
10 5 (15.63%) Front End Development
10 5 (15.63%) jQuery
10 5 (15.63%) Continuous Integration
10 5 (15.63%) Kanban
10 5 (15.63%) Node.js
10 5 (15.63%) REST
10 5 (15.63%) .NET
11 4 (12.50%) C#
11 4 (12.50%) Web Design
11 4 (12.50%) Finance
11 4 (12.50%) NUnit
11 4 (12.50%) Web Development
11 4 (12.50%) KnockoutJS
11 4 (12.50%) Responsive Web Design
11 4 (12.50%) Open Source

TDD
Top Related IT Skills in Cardiff 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 2 (6.25%) Confluence
2 1 (3.13%) Apache Airflow
2 1 (3.13%) Cloud Foundry
2 1 (3.13%) Elasticsearch
Applications
1 2 (6.25%) Photoshop
Cloud Services
1 3 (9.38%) Amazon AWS
2 1 (3.13%) Microsoft Azure
2 1 (3.13%) PaaS
Communications & Networking
1 3 (9.38%) HTTP
Database & Business Intelligence
1 6 (18.75%) Big Data
2 4 (12.50%) Relational Database
3 3 (9.38%) MySQL
3 3 (9.38%) NoSQL
4 2 (6.25%) Apache Cassandra
4 2 (6.25%) Hadoop
4 2 (6.25%) MongoDB
4 2 (6.25%) Oracle Database
5 1 (3.13%) Apache Hive
5 1 (3.13%) Couchbase
5 1 (3.13%) Neo4j
5 1 (3.13%) SQL Server
5 1 (3.13%) SQL Server 2008
5 1 (3.13%) SQL Server 2012
Development Applications
1 4 (12.50%) Cucumber
1 4 (12.50%) NUnit
2 3 (9.38%) Selenium
3 2 (6.25%) Git (software)
3 2 (6.25%) Jasmine
3 2 (6.25%) Jenkins
3 2 (6.25%) JIRA
3 2 (6.25%) Subversion
4 1 (3.13%) Atlassian Bamboo
4 1 (3.13%) Babel
4 1 (3.13%) gulp
4 1 (3.13%) MbUnit
4 1 (3.13%) Mercurial
4 1 (3.13%) Mocha
4 1 (3.13%) MSTest
4 1 (3.13%) Protractor
4 1 (3.13%) TeamCity
4 1 (3.13%) Visual Studio
4 1 (3.13%) WebDriver
4 1 (3.13%) webpack
General
1 4 (12.50%) Finance
2 2 (6.25%) Banking
2 2 (6.25%) Marketing
3 1 (3.13%) Investment Banking
3 1 (3.13%) Legal
Job Titles
1 27 (84.38%) Developer
2 8 (25.00%) Java Developer
3 5 (15.63%) Front End Developer (Client-Side Developer)
3 5 (15.63%) Scala Developer
3 5 (15.63%) Senior Developer
3 5 (15.63%) Senior Java Developer
4 4 (12.50%) .NET Developer
4 4 (12.50%) Java Scala Developer
5 3 (9.38%) Full Stack Developer
5 3 (9.38%) PHP Developer
5 3 (9.38%) Senior Java Scala Developer
5 3 (9.38%) Senior Scala Developer
6 2 (6.25%) C# .NET Developer
6 2 (6.25%) C# Developer
6 2 (6.25%) Front End Web Developer (Client-Side Developer)
6 2 (6.25%) HTML Developer
6 2 (6.25%) JavaScript Developer
6 2 (6.25%) Node.js Developer
6 2 (6.25%) PHP Zend Developer
6 2 (6.25%) Web Developer
Libraries, Frameworks & Software Standards
1 11 (34.38%) CSS
1 11 (34.38%) HTML
2 10 (31.25%) AngularJS
3 7 (21.88%) CSS3
3 7 (21.88%) HTML5
4 6 (18.75%) RESTful
5 5 (15.63%) .NET
5 5 (15.63%) jQuery
5 5 (15.63%) Node.js
5 5 (15.63%) REST
6 4 (12.50%) ASP.NET Web API
6 4 (12.50%) KnockoutJS
6 4 (12.50%) Twitter Bootstrap
7 3 (9.38%) Gherkin
7 3 (9.38%) JSON
7 3 (9.38%) NHibernate
7 3 (9.38%) Web Services
8 2 (6.25%) J2EE
8 2 (6.25%) Sass
9 1 (3.13%) Akka
Miscellaneous
1 2 (6.25%) User Experience
1 2 (6.25%) W3C
2 1 (3.13%) Analytical Skills
2 1 (3.13%) Enterprise Software
2 1 (3.13%) Fintech
Operating Systems
1 2 (6.25%) Linux
2 1 (3.13%) Mac OS
Processes & Methodologies
1 24 (75.00%) Agile Software Development
2 18 (56.25%) BDD
3 9 (28.13%) Scrum
4 7 (21.88%) Automated Testing
5 5 (15.63%) Continuous Integration
5 5 (15.63%) DevOps
5 5 (15.63%) Front End Development
5 5 (15.63%) Kanban
6 4 (12.50%) API Design
6 4 (12.50%) Continuous Delivery
6 4 (12.50%) Mentoring
6 4 (12.50%) Open Source
6 4 (12.50%) Responsive Web Design
6 4 (12.50%) Unit Testing
6 4 (12.50%) Web Accessibility
6 4 (12.50%) Web Design
6 4 (12.50%) Web Development
7 3 (9.38%) Domain-Driven Design
7 3 (9.38%) OO
7 3 (9.38%) Software Delivery
Programming Languages
1 13 (40.63%) Java
2 12 (37.50%) JavaScript
3 6 (18.75%) Scala
4 4 (12.50%) C#
5 3 (9.38%) PHP
5 3 (9.38%) Python
5 3 (9.38%) SQL
6 2 (6.25%) Go
7 1 (3.13%) Ruby
7 1 (3.13%) TypeScript
Qualifications
1 3 (9.38%) Security Cleared
2 1 (3.13%) SC Cleared
Quality Assurance & Compliance
1 2 (6.25%) QA
1 2 (6.25%) WAI
1 2 (6.25%) WCAG
System Software
1 2 (6.25%) Docker
Vendors
1 3 (9.38%) Oracle
2 2 (6.25%) Zend
3 1 (3.13%) CA Agile Central
3 1 (3.13%) HP