Period
to 25 May 2018

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 6 months to 25 May 2018 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
6 months to
25 May 2018
Same period 2017 Same period 2016
Rank 25 15 43
Rank change year-on-year -10 +28 +31
Contract jobs citing TDD 85 106 49
As % of all contract IT jobs advertised in Hertfordshire 5.82% 8.63% 3.65%
As % of the Processes & Methodologies category 7.13% 10.71% 4.61%
Number of daily rates quoted 69 87 31
Hertfordshire median daily rate £500 £525 £475
Median daily rate % change year-on-year -4.76% +10.53% +11.76%
10th Percentile £363 £326 £325
90th Percentile £588 £605 £650
East of England median daily rate £513 £465 £419
% change year-on-year +10.22% +11.04% +4.69%
Number of hourly rates quoted 0 0 0
Hertfordshire median hourly rate - - -
East of England median hourly rate £70.00 £39.00 £30.50
% change year-on-year +79.49% +27.87% -15.28%

TDD is in the Processes and Methodologies category. The following table is for comparison with the above and provides summary statistics for all contract job vacancies advertised in Hertfordshire with a requirement for process or methodology skills.

All Process and Methodology Skills
Hertfordshire
Contract vacancies with a requirement for process or methodology skills 1,192 990 1,063
As % of all contract IT jobs advertised in Hertfordshire 81.59% 80.62% 79.09%
Number of daily rates quoted 641 519 536
Hertfordshire median daily rate £400 £425 £400
Median daily rate % change year-on-year -5.88% +6.25% -
10th Percentile £210 £200 £250
90th Percentile £560 £575 £575
East of England median daily rate £438 £422 £413
% change year-on-year +3.67% +2.30% +3.13%
Number of hourly rates quoted 77 53 65
Hertfordshire median hourly rate £17.25 £31.50 £29.00
Median hourly rate % change year-on-year -45.24% +8.62% -0.85%
10th Percentile £10.22 £13.00 £12.63
90th Percentile £45.50 £52.88 £52.25
East of England median hourly rate £17.50 £33.00 £27.00
% change year-on-year -46.97% +22.22% +8.00%

TDD
Job Vacancy Trend in Hertfordshire

Job postings citing TDD as a percentage of all IT jobs advertised in Hertfordshire.

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 6 months to 25 May 2018.

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 6 months to 25 May 2018. The 'Rank Change' column provides an indication of the change in demand within each location based on the same 6 month period last year.

Location Rank Change
on Same Period
Last Year
Matching
Contract
IT Job Ads
Median
Daily Rate
Past 6 Months
Median Daily Rate
% Change
on Same Period
Last Year
Live
Job
Vacancies
Watford +6 20 £450 +5.88% 10
Welwyn Garden City +4 19 £525 +5.00% 5
Hemel Hempstead +3 18 £400 +11.11% 3
Hatfield -22 3 £525 - 1
Rickmansworth -12 1 £525 +63.42% 1
Stevenage - 1 - -
TDD
East of England

For the 6 months to 25 May 2018, IT contractor jobs citing TDD also mentioned the following skills in order of popularity. The figures indicate the absolute number co-occurrences and as a proportion of all contract job ads across the Hertfordshire region with a requirement for TDD.

1 73 (85.88%) Agile Software Development
2 43 (50.59%) BDD
3 42 (49.41%) Java
4 31 (36.47%) Java 8
5 30 (35.29%) Scrum
6 28 (32.94%) Kanban
7 25 (29.41%) Amazon AWS
7 25 (29.41%) Microservices
8 24 (28.24%) E-Commerce
9 23 (27.06%) Continuous Integration
10 22 (25.88%) JavaScript
10 22 (25.88%) C#
10 22 (25.88%) .NET
10 22 (25.88%) DevOps
11 21 (24.71%) REST
12 19 (22.35%) HTML
12 19 (22.35%) CSS
12 19 (22.35%) MVC
13 18 (21.18%) SOAP
14 17 (20.00%) Spring
15 15 (17.65%) Greenfield Project
16 14 (16.47%) SQL
17 13 (15.29%) Continuous Delivery
17 13 (15.29%) Node.js
17 13 (15.29%) AngularJS
18 12 (14.12%) MongoDB
18 12 (14.12%) ASP.NET MVC
18 12 (14.12%) HTML5
18 12 (14.12%) .NET Core
18 12 (14.12%) ASP.NET

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 7 (8.24%) Elasticsearch
2 3 (3.53%) Oracle SOA Suite
3 1 (1.18%) Confluence
Business Applications
1 3 (3.53%) Magento
Cloud Services
1 25 (29.41%) Amazon AWS
2 8 (9.41%) Google Analytics
2 8 (9.41%) PaaS
3 7 (8.24%) Amazon EC2
3 7 (8.24%) Amazon SQS
4 6 (7.06%) Amazon S3
5 3 (3.53%) GitHub
5 3 (3.53%) Heroku
Communications & Networking
1 2 (2.35%) DNS
1 2 (2.35%) FTP
1 2 (2.35%) HTTP
1 2 (2.35%) SSL
1 2 (2.35%) TCP/IP
2 1 (1.18%) SpaceWire
2 1 (1.18%) Wi-Fi
Database & Business Intelligence
1 12 (14.12%) MongoDB
2 10 (11.76%) NoSQL
3 9 (10.59%) SQL Server
4 5 (5.88%) MySQL
4 5 (5.88%) SQL Server 2014
5 3 (3.53%) PostgreSQL
6 2 (2.35%) Amazon DynamoDB
7 1 (1.18%) Big Data
7 1 (1.18%) Couchbase
7 1 (1.18%) Relational Database
7 1 (1.18%) SQL Server 2012
Development Applications
1 11 (12.94%) Git (software)
2 10 (11.76%) JIRA
3 9 (10.59%) gulp
4 7 (8.24%) Grunt
4 7 (8.24%) Jenkins
4 7 (8.24%) NUnit
4 7 (8.24%) ReSharper
4 7 (8.24%) Visual Studio
5 5 (5.88%) Jasmine
5 5 (5.88%) Mocha
5 5 (5.88%) webpack
6 4 (4.71%) JUnit
6 4 (4.71%) Maven
7 3 (3.53%) Hudson
7 3 (3.53%) Karma Test Runner
7 3 (3.53%) Mockito
8 2 (2.35%) Cucumber
8 2 (2.35%) GitLab
8 2 (2.35%) Gradle
8 2 (2.35%) Zephyr
General
1 8 (9.41%) Advertising
1 8 (9.41%) Finance
1 8 (9.41%) Marketing
2 6 (7.06%) Retail
3 2 (2.35%) Automotive
3 2 (2.35%) Law
4 1 (1.18%) Avionics
4 1 (1.18%) Telecoms
Job Titles
1 61 (71.76%) Developer
2 33 (38.82%) Java Developer
3 14 (16.47%) .NET Developer
4 12 (14.12%) Senior Developer
4 12 (14.12%) Senior Java Developer
5 11 (12.94%) C# .NET Developer
5 11 (12.94%) C# Developer
6 8 (9.41%) Architect
6 8 (9.41%) E-Commerce Architect
6 8 (9.41%) E-Commerce Solution Architect
6 8 (9.41%) Solutions Architect
7 7 (8.24%) Digital Architect
7 7 (8.24%) Digital Solutions Architect
7 7 (8.24%) JavaScript Developer
7 7 (8.24%) Scrum Master
8 6 (7.06%) AWS Developer
9 5 (5.88%) ASP.NET Developer
9 5 (5.88%) C# ASP.NET Developer
10 4 (4.71%) Tester
10 4 (4.71%) WCF Developer
Libraries, Frameworks & Software Standards
1 22 (25.88%) .NET
2 21 (24.71%) REST
3 19 (22.35%) CSS
3 19 (22.35%) HTML
4 18 (21.18%) SOAP
5 17 (20.00%) Spring
6 13 (15.29%) AngularJS
6 13 (15.29%) Node.js
7 12 (14.12%) .NET Core
7 12 (14.12%) ASP.NET
7 12 (14.12%) ASP.NET MVC
7 12 (14.12%) HTML5
8 11 (12.94%) Kafka
8 11 (12.94%) RESTful
9 10 (11.76%) React
9 10 (11.76%) Web Services
10 9 (10.59%) Hibernate
11 8 (9.41%) J2EE
11 8 (9.41%) jQuery
11 8 (9.41%) XHTML
Miscellaneous
1 15 (17.65%) Greenfield Project
2 5 (5.88%) Tandem
3 3 (3.53%) Driving Licence
3 3 (3.53%) Linux Command Line
3 3 (3.53%) User Experience
3 3 (3.53%) Vector Graphics
4 2 (2.35%) Analytical Skills
4 2 (2.35%) W3C
5 1 (1.18%) Client/Server
Operating Systems
1 9 (10.59%) Linux
2 7 (8.24%) Windows
3 3 (3.53%) Unix
Processes & Methodologies
1 73 (85.88%) Agile Software Development
2 43 (50.59%) BDD
3 30 (35.29%) Scrum
4 28 (32.94%) Kanban
5 25 (29.41%) Microservices
6 24 (28.24%) E-Commerce
7 23 (27.06%) Continuous Integration
8 22 (25.88%) DevOps
9 19 (22.35%) MVC
10 13 (15.29%) Continuous Delivery
11 12 (14.12%) Pair Programming
12 11 (12.94%) OO
13 9 (10.59%) SOLID
14 8 (9.41%) Analytics
14 8 (9.41%) Cybersecurity
14 8 (9.41%) Refactoring
15 7 (8.24%) Continuous Improvement
15 7 (8.24%) Test Automation
16 6 (7.06%) Continuous Deployment
16 6 (7.06%) Web Application Development
Programming Languages
1 42 (49.41%) Java
2 31 (36.47%) Java 8
3 22 (25.88%) C#
3 22 (25.88%) JavaScript
4 14 (16.47%) SQL
5 10 (11.76%) Scala
6 7 (8.24%) Groovy
7 6 (7.06%) PHP
7 6 (7.06%) Ruby
8 5 (5.88%) T-SQL
9 4 (4.71%) ES6
10 3 (3.53%) Python
11 2 (2.35%) TypeScript
Qualifications
1 3 (3.53%) Security Cleared
2 2 (2.35%) ISTQB
2 2 (2.35%) ISTQB Foundation Certification
2 2 (2.35%) SC Cleared
Quality Assurance & Compliance
1 4 (4.71%) QA
2 1 (1.18%) ECSS
2 1 (1.18%) MIL-STD-1553
System Software
1 11 (12.94%) Docker
Systems Management
1 2 (2.35%) Docker Swarm
2 1 (1.18%) Kubernetes
Vendors
1 8 (9.41%) Google
2 5 (5.88%) Microsoft
2 5 (5.88%) Oracle
3 3 (3.53%) hybris
3 3 (3.53%) IBM
4 2 (2.35%) Zend
5 1 (1.18%) New Relic
5 1 (1.18%) Percona
5 1 (1.18%) Xamarin