The following table provides summary statistics for contract job vacancies advertised in Hertfordshire 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)
East of England / Hertfordshire
3 months to
30 Mar 2017
Same period 2016 Same period 2015
Rank 12 41 58
Rank change year-on-year +29 +17  
Contract jobs citing TDD 54 18 8
As % of all contract IT jobs advertised in Hertfordshire 9.20% 2.58% 1.15%
As % of the Processes & Methodologies category 11.84% 3.41% 1.52%
Number of daily rates quoted 45 10 4
Median daily rate £525 £488 £463
Median daily rate % change year-on-year +7.69% +5.40%  
90% offered a daily rate of more than £483 £406 £355
10% offered a daily rate of more than £582 £553 £500
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 Hertfordshire with a requirement for process and methodology skills.

Contract Process & Methodology Skills
Hertfordshire
Contract job vacancies with a requirement for process and methodology skills 456 528 527
As % of all contract IT job vacancies advertised in Hertfordshire 77.68% 75.64% 75.61%
Number of daily rates quoted 242 283 273
Median daily rate £475 £425 £400
Median daily rate % change year-on-year +11.76% +6.25%  
90% offered a daily rate of more than £275 £305 £265
10% offered a daily rate of more than £600 £550 £550
UK excluding London median daily rate £410 £400 £396
% change year-on-year +2.50% +1.01%  
Number of hourly rates quoted 28 27 30
Median hourly rate £45.00 £37.50 £16.00
Median hourly rate % change year-on-year +20.00% +134.37%  
90% offered a hourly rate of more than £27.50 £8.50 £10.35
10% offered a hourly rate of more than £52.50 £49.50 £36.80
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 Hertfordshire

The job posting trend of jobs advertised in Hertfordshire 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 Hertfordshire

TDD
Contractor Daily Rate Trend in Hertfordshire

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

Contractor daily rate trend for TDD in Hertfordshire

TDD
Contractor Daily Rate Histogram in Hertfordshire

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

Contractor daily rate histogram for TDD in Hertfordshire

TDD
Contractor Hourly Rate Trend in Hertfordshire

This chart provides the 3-month moving average for contractor hourly rates quoted in IT jobs citing TDD in Hertfordshire.

Contractor hourly rate trend for TDD in Hertfordshire

TDD
Contract Job Locations in Hertfordshire

The table below looks at the demand and provides a guide to the median contractor rates quoted in IT jobs citing TDD within the Hertfordshire region over the 3 months to 30 March 2017. The 'Rank Change' column provides an indication of the change in demand within each location based on the same 3 month period last year.

Location Rank Change
on Same Period
Last Year
Matching
Contract
IT Job Ads
Median
Daily Rate
Last 3 Months
Median Daily Rate
% Change
on Same Period
Last Year
Live
Job
Vacancies
Hatfield +3 24 £525 +10.52%
Welwyn Garden City +2 5 £500 -
Hemel Hempstead +8 1 £360 -35.28% 4
Rickmansworth +8 1 - -
Welwyn 0 1 - -
Watford -6 1 £425 -3.95% 6
Letchworth - 1 - - 2
TDD
East of England

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 Hertfordshire region with a requirement for TDD.

1 119 (92.97%) Agile Software Development
2 94 (73.44%) Java
3 89 (69.53%) BDD
4 63 (49.22%) Scrum
5 40 (31.25%) E-Commerce
6 39 (30.47%) Spring
7 31 (24.22%) DevOps
7 31 (24.22%) JIRA
8 30 (23.44%) RESTful
9 29 (22.66%) Git (software)
9 29 (22.66%) Kanban
10 27 (21.09%) Hibernate
11 25 (19.53%) OO
12 24 (18.75%) QA
12 24 (18.75%) ATDD
13 21 (16.41%) Continuous Integration
14 20 (15.63%) Amazon AWS
14 20 (15.63%) Jenkins
14 20 (15.63%) Continuous Delivery
14 20 (15.63%) Microservices
15 19 (14.84%) Maven
16 18 (14.06%) Web Services
17 17 (13.28%) Opscode Chef
17 17 (13.28%) Scala
17 17 (13.28%) Puppet
18 16 (12.50%) REST
18 16 (12.50%) Concurrent Programming
18 16 (12.50%) Finance
18 16 (12.50%) Selenium
19 15 (11.72%) Software Engineering

TDD
Co-occurring IT Skills in Hertfordshire 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 8 (6.25%) Confluence
2 6 (4.69%) IIS
2 6 (4.69%) Tomcat
3 5 (3.91%) Apache Spark
4 3 (2.34%) Elasticsearch
4 3 (2.34%) nginx
5 2 (1.56%) CMS
5 2 (1.56%) Magnolia
6 1 (0.78%) Apache
Applications
1 5 (3.91%) MS Excel
2 2 (1.56%) Photoshop
3 1 (0.78%) MS Office
Cloud Services
1 20 (15.63%) Amazon AWS
2 2 (1.56%) Amazon EC2
2 2 (1.56%) Amazon SQS
2 2 (1.56%) Microsoft Azure
2 2 (1.56%) PaaS
3 1 (0.78%) Amazon S3
Communications & Networking
1 4 (3.13%) TCP/IP
Database & Business Intelligence
1 14 (10.94%) NoSQL
1 14 (10.94%) SQL Server
2 10 (7.81%) Apache Cassandra
3 6 (4.69%) Big Data
3 6 (4.69%) MongoDB
3 6 (4.69%) MySQL
3 6 (4.69%) SQL Server 2012
4 5 (3.91%) Relational Database
5 3 (2.34%) Couchbase
5 3 (2.34%) Redis
6 2 (1.56%) Azure SQL Database
6 2 (1.56%) Hadoop
6 2 (1.56%) SQL Server 2014
7 1 (0.78%) Apache Hive
7 1 (0.78%) HBase
Development Applications
1 31 (24.22%) JIRA
2 29 (22.66%) Git (software)
3 20 (15.63%) Jenkins
4 19 (14.84%) Maven
5 16 (12.50%) Selenium
6 15 (11.72%) Cucumber
7 13 (10.16%) Gradle
8 12 (9.38%) Ant
9 11 (8.59%) WebDriver
10 9 (7.03%) JBehave
11 8 (6.25%) Atlassian Bamboo
11 8 (6.25%) JUnit
12 7 (5.47%) Moq
12 7 (5.47%) Team Foundation Server
13 6 (4.69%) SoapUI
14 5 (3.91%) FxCop
14 5 (3.91%) ReSharper
14 5 (3.91%) StyleCop
15 3 (2.34%) Mockito
15 3 (2.34%) Vagrant
General
1 16 (12.50%) Finance
2 13 (10.16%) Retail
3 1 (0.78%) Games
3 1 (0.78%) Legal
3 1 (0.78%) Publishing
Job Titles
1 98 (76.56%) Developer
2 74 (57.81%) Java Developer
3 33 (25.78%) Agile Developer
4 32 (25.00%) Agile Java Developer
5 28 (21.88%) Senior Developer
6 27 (21.09%) AWS Developer
6 27 (21.09%) Senior Java Developer
7 19 (14.84%) Senior Agile Developer
7 19 (14.84%) Senior Agile Java Developer
8 13 (10.16%) E-Commerce Developer
8 13 (10.16%) Java E-Commerce Developer
9 12 (9.38%) .NET Developer
10 11 (8.59%) C# Developer
11 10 (7.81%) C# .NET Developer
12 9 (7.03%) Architect
13 7 (5.47%) ASP.NET Developer
13 7 (5.47%) ASP.NET MVC Developer
14 6 (4.69%) Software Developer
14 6 (4.69%) Software Engineer
14 6 (4.69%) Test Manager
Libraries, Frameworks & Software Standards
1 39 (30.47%) Spring
2 30 (23.44%) RESTful
3 27 (21.09%) Hibernate
4 18 (14.06%) Web Services
5 16 (12.50%) REST
6 15 (11.72%) .NET
6 15 (11.72%) CSS
6 15 (11.72%) HTML
7 12 (9.38%) ASP.NET Web API
7 12 (9.38%) RxJava
8 11 (8.59%) Gherkin
8 11 (8.59%) XML
9 10 (7.81%) ASP.NET
9 10 (7.81%) JSON
10 9 (7.03%) .NET Framework
10 9 (7.03%) Entity Framework
11 8 (6.25%) Node.js
12 7 (5.47%) AngularJS
12 7 (5.47%) SOAP
12 7 (5.47%) WCF
Miscellaneous
1 12 (9.38%) Data Structures
2 11 (8.59%) Algorithms
3 6 (4.69%) iPad
4 5 (3.91%) Client/Server
5 4 (3.13%) Contactless
5 4 (3.13%) EMV
6 2 (1.56%) FMCG
6 2 (1.56%) User Experience
6 2 (1.56%) W3C
7 1 (0.78%) Linux Command Line
7 1 (0.78%) Mobile App
7 1 (0.78%) Tandem
Operating Systems
1 10 (7.81%) Linux
2 7 (5.47%) Unix
3 1 (0.78%) Android
Processes & Methodologies
1 119 (92.97%) Agile Software Development
2 89 (69.53%) BDD
3 63 (49.22%) Scrum
4 40 (31.25%) E-Commerce
5 31 (24.22%) DevOps
6 29 (22.66%) Kanban
7 25 (19.53%) OO
8 24 (18.75%) ATDD
9 21 (16.41%) Continuous Integration
10 20 (15.63%) Continuous Delivery
10 20 (15.63%) Microservices
11 16 (12.50%) Concurrent Programming
12 15 (11.72%) Open Source
12 15 (11.72%) Software Engineering
13 14 (10.94%) Software Testing
14 12 (9.38%) MVC
14 12 (9.38%) OOD
14 12 (9.38%) Pair Programming
15 11 (8.59%) Complexity Analysis
15 11 (8.59%) Test Strategy
Programming Languages
1 94 (73.44%) Java
2 17 (13.28%) Scala
3 15 (11.72%) C#
3 15 (11.72%) JavaScript
4 13 (10.16%) Go
5 10 (7.81%) Clojure
5 10 (7.81%) Rust
6 8 (6.25%) F#
6 8 (6.25%) SQL
7 6 (4.69%) VBScript
8 5 (3.91%) Groovy
9 4 (3.13%) Ruby
10 3 (2.34%) C++
10 3 (2.34%) Lua
10 3 (2.34%) Python
11 2 (1.56%) Haskell
11 2 (1.56%) Shell Script
11 2 (1.56%) VB.NET
12 1 (0.78%) T-SQL
Qualifications
1 1 (0.78%) Degree
Quality Assurance & Compliance
1 24 (18.75%) QA
2 2 (1.56%) SDET
2 2 (1.56%) WAI
System Software
1 3 (2.34%) Docker
Systems Management
1 17 (13.28%) Opscode Chef
1 17 (13.28%) Puppet
2 13 (10.16%) Ansible
3 2 (1.56%) TeamSite
Vendors
1 9 (7.03%) Atlassian
1 9 (7.03%) Microsoft
2 5 (3.91%) Oracle
3 4 (3.13%) IBM
4 1 (0.78%) hybris