Period
to 16 August 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 16 August 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
16 Aug 2018
Same period 2017 Same period 2016
Rank 24 32 49
Rank change year-on-year +8 +17 +25
Contract jobs citing TDD 90 62 41
As % of all contract IT jobs advertised in Hertfordshire 5.72% 4.81% 2.82%
As % of the Processes & Methodologies category 6.98% 5.91% 3.57%
Number of daily rates quoted 80 64 35
Hertfordshire median daily rate £510 £470 £475
Median daily rate % change year-on-year +8.51% -1.05% -5.00%
10th Percentile £363 £320 £325
90th Percentile £569 £588 £695
East of England median daily rate £525 £488 £410
% change year-on-year +7.69% +18.90% +2.50%
Number of hourly rates quoted 1 0 0
Hertfordshire median hourly rate £42.50 - -
East of England median hourly rate £50.94 £41.50 £33.95
% change year-on-year +22.74% +22.24% -20.12%

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 1,289 1,049 1,150
As % of all contract IT jobs advertised in Hertfordshire 81.89% 81.38% 79.20%
Number of daily rates quoted 742 544 616
Hertfordshire median daily rate £413 £411 £400
Median daily rate % change year-on-year +0.30% +2.81% +5.12%
10th Percentile £210 £213 £220
90th Percentile £569 £588 £550
East of England median daily rate £438 £425 £400
% change year-on-year +2.94% +6.25% +3.23%
Number of hourly rates quoted 94 66 47
Hertfordshire median hourly rate £17.32 £16.82 £25.00
Median hourly rate % change year-on-year +2.97% -32.72% +35.14%
10th Percentile £11.10 £11.76 £9.70
90th Percentile £46.25 £45.75 £53.75
East of England median hourly rate £17.50 £26.00 £25.00
% change year-on-year -32.69% +4.00% +9.89%

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 16 August 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 16 August 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 +13 23 £506 +39.66% 6
Welwyn Garden City +3 21 £563 +15.38% 3
Hemel Hempstead +3 17 £400 +11.11% 2
St Albans -4 3 £538 +65.38% 7
Hatfield -17 2 £525 -1.18% 2
Stevenage -17 2 - - 1
Hitchin - 1 £510 -
TDD
East of England

For the 6 months to 16 August 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 (81.11%) Agile Software Development
2 51 (56.67%) Java
3 41 (45.56%) Java 8
4 37 (41.11%) BDD
5 31 (34.44%) Microservices
5 31 (34.44%) Continuous Integration
6 30 (33.33%) C#
6 30 (33.33%) AngularJS
6 30 (33.33%) REST
7 29 (32.22%) Scrum
8 28 (31.11%) SQL
9 27 (30.00%) SOAP
10 26 (28.89%) Kanban
11 24 (26.67%) MVC
12 23 (25.56%) CSS
12 23 (25.56%) Git (software)
13 22 (24.44%) .NET
14 21 (23.33%) Spring
15 20 (22.22%) Continuous Delivery
16 19 (21.11%) Test Automation
17 18 (20.00%) DevOps
17 18 (20.00%) JavaScript
17 18 (20.00%) E-Commerce
18 17 (18.89%) Web Services
18 17 (18.89%) HTML
18 17 (18.89%) JIRA
19 16 (17.78%) SQL Server
19 16 (17.78%) Greenfield Project
20 15 (16.67%) ASP.NET
20 15 (16.67%) SOLID

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 5 (5.56%) Elasticsearch
2 2 (2.22%) NServiceBus
3 1 (1.11%) Confluence
Business Applications
1 1 (1.11%) Magento
Cloud Services
1 14 (15.56%) Amazon AWS
2 4 (4.44%) Amazon EC2
2 4 (4.44%) Amazon S3
2 4 (4.44%) Amazon SQS
3 2 (2.22%) Heroku
3 2 (2.22%) Microsoft Azure
4 1 (1.11%) GitHub
Communications & Networking
1 2 (2.22%) DNS
1 2 (2.22%) FTP
1 2 (2.22%) HTTP
1 2 (2.22%) SSL
1 2 (2.22%) TCP/IP
2 1 (1.11%) SpaceWire
2 1 (1.11%) Wi-Fi
Database & Business Intelligence
1 16 (17.78%) SQL Server
2 8 (8.89%) PostgreSQL
3 6 (6.67%) MongoDB
4 4 (4.44%) MySQL
5 3 (3.33%) SQL Server Reporting Services
6 2 (2.22%) SQL Server 2014
6 2 (2.22%) SQL Server Integration Services
7 1 (1.11%) Big Data
7 1 (1.11%) Data Warehouse
7 1 (1.11%) NoSQL
7 1 (1.11%) Relational Database
7 1 (1.11%) SQL Server 2012
7 1 (1.11%) SQL Server 2016
Development Applications
1 23 (25.56%) Git (software)
2 17 (18.89%) JIRA
3 14 (15.56%) Jenkins
4 11 (12.22%) NUnit
4 11 (12.22%) ReSharper
4 11 (12.22%) Visual Studio
5 10 (11.11%) Subversion
6 6 (6.67%) gulp
6 6 (6.67%) JUnit
7 4 (4.44%) Grunt
8 3 (3.33%) Cucumber
8 3 (3.33%) Gradle
8 3 (3.33%) IntelliJ
8 3 (3.33%) Jasmine
8 3 (3.33%) Mocha
8 3 (3.33%) Mockito
9 2 (2.22%) Eclipse
9 2 (2.22%) Eclipse RCP
9 2 (2.22%) Redmine
9 2 (2.22%) Team Foundation Server
General
1 12 (13.33%) Finance
2 6 (6.67%) Retail
3 2 (2.22%) Advertising
4 1 (1.11%) Aerospace
4 1 (1.11%) Avionics
4 1 (1.11%) Games
4 1 (1.11%) Law
4 1 (1.11%) Telecoms
Job Titles
1 77 (85.56%) Developer
2 44 (48.89%) Java Developer
3 25 (27.78%) Senior Developer
4 23 (25.56%) Senior Java Developer
5 18 (20.00%) .NET Developer
6 14 (15.56%) C# .NET Developer
6 14 (15.56%) C# Developer
7 7 (7.78%) SQL Developer
8 6 (6.67%) Angular Developer
8 6 (6.67%) ASP.NET Developer
8 6 (6.67%) C# ASP.NET Developer
8 6 (6.67%) Data Migration Developer
8 6 (6.67%) ETL Developer
8 6 (6.67%) Oracle Developer
8 6 (6.67%) Oracle ETL Developer
8 6 (6.67%) PostgreSQL Developer
8 6 (6.67%) SQL Server Developer
9 5 (5.56%) Agile Developer
9 5 (5.56%) Agile Java Developer
9 5 (5.56%) Backend Developer
Libraries, Frameworks & Software Standards
1 30 (33.33%) AngularJS
1 30 (33.33%) REST
2 27 (30.00%) SOAP
3 23 (25.56%) CSS
4 22 (24.44%) .NET
5 21 (23.33%) Spring
6 17 (18.89%) HTML
6 17 (18.89%) Web Services
7 15 (16.67%) ASP.NET
8 13 (14.44%) ASP.NET MVC
9 12 (13.33%) HTML5
10 11 (12.22%) CSS3
10 11 (12.22%) Dropwizard
10 11 (12.22%) Spring Boot
10 11 (12.22%) Velocity
10 11 (12.22%) WCF
11 9 (10.00%) ASP.NET Web API
12 7 (7.78%) Hibernate
12 7 (7.78%) React
12 7 (7.78%) RESTful
Miscellaneous
1 16 (17.78%) Greenfield Project
2 7 (7.78%) Analytical Skills
3 6 (6.67%) Reference Data
4 3 (3.33%) Linux Command Line
4 3 (3.33%) Self-Motivation
5 2 (2.22%) Client/Server
5 2 (2.22%) Tandem
6 1 (1.11%) Computer Science
6 1 (1.11%) User Experience
6 1 (1.11%) Vector Graphics
6 1 (1.11%) W3C
Operating Systems
1 11 (12.22%) Windows
2 9 (10.00%) Linux
3 2 (2.22%) Unix
Processes & Methodologies
1 73 (81.11%) Agile Software Development
2 37 (41.11%) BDD
3 31 (34.44%) Continuous Integration
3 31 (34.44%) Microservices
4 29 (32.22%) Scrum
5 26 (28.89%) Kanban
6 24 (26.67%) MVC
7 20 (22.22%) Continuous Delivery
8 19 (21.11%) Test Automation
9 18 (20.00%) DevOps
9 18 (20.00%) E-Commerce
10 15 (16.67%) SOLID
11 14 (15.56%) Refactoring
12 11 (12.22%) Pair Programming
12 11 (12.22%) Software Engineering
13 9 (10.00%) Domain-Driven Design
13 9 (10.00%) ETL
14 8 (8.89%) Data Migration
14 8 (8.89%) Migration
14 8 (8.89%) Scaled Agile Framework
Programming Languages
1 51 (56.67%) Java
2 41 (45.56%) Java 8
3 30 (33.33%) C#
4 28 (31.11%) SQL
5 18 (20.00%) JavaScript
6 6 (6.67%) Groovy
6 6 (6.67%) PL/SQL
7 5 (5.56%) Scala
7 5 (5.56%) T-SQL
8 4 (4.44%) ES6
8 4 (4.44%) PHP
9 3 (3.33%) TypeScript
10 2 (2.22%) C
11 1 (1.11%) Python
11 1 (1.11%) Ruby
Qualifications
1 9 (10.00%) Security Cleared
2 8 (8.89%) SC Cleared
3 2 (2.22%) ISTQB
3 2 (2.22%) ISTQB Foundation Certification
4 1 (1.11%) Computer Science Degree
4 1 (1.11%) Degree
Quality Assurance & Compliance
1 8 (8.89%) QA
2 1 (1.11%) ECSS
2 1 (1.11%) MIL-STD-1553
System Software
1 4 (4.44%) Docker
Systems Management
1 2 (2.22%) Docker Swarm
2 1 (1.11%) Kubernetes
Vendors
1 14 (15.56%) Oracle
2 6 (6.67%) Talend
3 4 (4.44%) Microsoft
4 3 (3.33%) New Relic
5 2 (2.22%) Zend
6 1 (1.11%) hybris
6 1 (1.11%) IBM
6 1 (1.11%) Percona
6 1 (1.11%) Xamarin