Period
to 22 November 2017

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 22 November 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
6 months to
22 Nov 2017
Same period 2016 Same period 2015
Rank 33 24 62
Rank change year-on-year -9 +38 -19
Contract jobs citing TDD 75 81 42
As % of all contract IT jobs advertised in Hertfordshire 4.75% 5.79% 2.63%
As % of the Processes & Methodologies category 5.94% 7.53% 3.48%
Number of daily rates quoted 77 71 23
Hertfordshire median daily rate £388 £525 £500
Median daily rate % change year-on-year -26.19% +5.00% +25.00%
10th Percentile £313 £375 £353
90th Percentile £538 £700 £618
East of England median daily rate £485 £475 £413
% change year-on-year +2.11% +15.15% +3.13%
Number of hourly rates quoted 0 0 0
Hertfordshire median hourly rate - - -
East of England median hourly rate £62.50 £36.51 £37.45
% change year-on-year +71.19% -2.51% -

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 1262 1076 1206
As % of all contract IT jobs advertised in Hertfordshire 79.87% 76.91% 75.61%
Number of daily rates quoted 624 625 605
Hertfordshire median daily rate £400 £413 £400
Median daily rate % change year-on-year -3.03% +3.13% +6.67%
10th Percentile £213 £224 £225
90th Percentile £575 £545 £570
East of England median daily rate £425 £400 £400
% change year-on-year +6.25% - +6.67%
Number of hourly rates quoted 67 58 96
Hertfordshire median hourly rate £19.00 £32.25 £21.00
Median hourly rate % change year-on-year -41.09% +53.57% +31.25%
10th Percentile £13.00 £10.35 £9.50
90th Percentile £46.80 £53.75 £43.13
East of England median hourly rate £31.50 £32.00 £23.75
% change year-on-year -1.56% +34.74% -1.53%

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 22 November 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 6 months to 22 November 2017. 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 +10 25 £388 -26.19% 10
Stevenage - 14 £363 - 1
Welwyn Garden City -1 8 £525 -8.70% 5
Hatfield -14 7 £438 -16.67%
St Albans -3 4 £325 -38.10% 5
Hemel Hempstead - 1 - - 7
Waltham Cross - 1 £563 - 1
Cheshunt - 1 £325 -
TDD
East of England

For the 6 months to 22 November 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 68 (90.67%) Agile Software Development
2 37 (49.33%) Java
3 29 (38.67%) BDD
4 27 (36.00%) Scrum
5 25 (33.33%) MVC
6 24 (32.00%) Spring
7 22 (29.33%) Microservices
8 19 (25.33%) .NET
8 19 (25.33%) SOLID
9 18 (24.00%) C#
9 18 (24.00%) Continuous Integration
9 18 (24.00%) Git (software)
10 17 (22.67%) JavaScript
10 17 (22.67%) Web Services
11 16 (21.33%) Pair Programming
12 15 (20.00%) SQL Server
12 15 (20.00%) Kanban
12 15 (20.00%) Amazon AWS
13 14 (18.67%) Spring Boot
13 14 (18.67%) E-Commerce
14 13 (17.33%) Microsoft
14 13 (17.33%) HTML
14 13 (17.33%) CSS
14 13 (17.33%) WCF
14 13 (17.33%) Finance
14 13 (17.33%) React
15 12 (16.00%) Web Development
16 11 (14.67%) SOAP
16 11 (14.67%) OO
16 11 (14.67%) Continuous Delivery

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 (9.33%) Tomcat
2 5 (6.67%) Apache
3 4 (5.33%) Apache Spark
3 4 (5.33%) MQSeries
4 3 (4.00%) IIS
5 2 (2.67%) Apache Solr
5 2 (2.67%) Confluence
6 1 (1.33%) Elasticsearch
Cloud Services
1 15 (20.00%) Amazon AWS
2 3 (4.00%) Google Analytics
2 3 (4.00%) PaaS
3 2 (2.67%) Amazon EC2
4 1 (1.33%) Amazon SQS
4 1 (1.33%) Microsoft Azure
Communications & Networking
1 7 (9.33%) 3GPP
1 7 (9.33%) LTE
1 7 (9.33%) Wireless
2 4 (5.33%) Internet
Database & Business Intelligence
1 15 (20.00%) SQL Server
2 11 (14.67%) MongoDB
3 9 (12.00%) SQL Server Integration Services
4 8 (10.67%) NoSQL
5 7 (9.33%) MySQL
5 7 (9.33%) SQL Server Reporting Services
6 6 (8.00%) PostgreSQL
7 5 (6.67%) Apache Cassandra
7 5 (6.67%) Redis
8 4 (5.33%) Data Warehouse
9 3 (4.00%) Big Data
9 3 (4.00%) RDBMS
9 3 (4.00%) Relational Database
9 3 (4.00%) SQL Server 2014
10 1 (1.33%) Amazon Aurora
10 1 (1.33%) DB2
10 1 (1.33%) Hadoop
10 1 (1.33%) Oracle Database
Development Applications
1 18 (24.00%) Git (software)
2 10 (13.33%) Team Foundation Server
3 9 (12.00%) Maven
4 8 (10.67%) JUnit
5 6 (8.00%) Eclipse
5 6 (8.00%) Grunt
5 6 (8.00%) gulp
5 6 (8.00%) IntelliJ
5 6 (8.00%) JIRA
6 5 (6.67%) Mockito
7 4 (5.33%) Atlassian Bamboo
7 4 (5.33%) Log4j
7 4 (5.33%) Moq
7 4 (5.33%) Subversion
7 4 (5.33%) Talend Open Studio
8 3 (4.00%) Cucumber
8 3 (4.00%) Gradle
8 3 (4.00%) ReSharper
8 3 (4.00%) Selenium
8 3 (4.00%) WebDriver
General
1 13 (17.33%) Finance
2 7 (9.33%) Telecoms
3 4 (5.33%) Games
3 4 (5.33%) Retail
4 3 (4.00%) Advertising
4 3 (4.00%) Marketing
5 1 (1.33%) Back Office
5 1 (1.33%) Front Office
Job Titles
1 54 (72.00%) Developer
2 27 (36.00%) Java Developer
3 13 (17.33%) C# Developer
4 11 (14.67%) .NET Developer
5 10 (13.33%) ASP.NET MVC Developer
5 10 (13.33%) C# .NET Developer
5 10 (13.33%) SQL Developer
5 10 (13.33%) SQL Server Developer
6 9 (12.00%) C# WCF Developer
6 9 (12.00%) SSIS Developer
6 9 (12.00%) WCF Developer
7 8 (10.67%) Senior Developer
8 7 (9.33%) DSP Engineer
8 7 (9.33%) Full Stack Developer
8 7 (9.33%) Senior DSP Engineer
9 6 (8.00%) Ruby on Rails Developer
9 6 (8.00%) SSRS Developer
10 5 (6.67%) Ruby Developer
11 4 (5.33%) Senior .NET Developer
11 4 (5.33%) Senior SQL Server Developer
Libraries, Frameworks & Software Standards
1 24 (32.00%) Spring
2 19 (25.33%) .NET
3 17 (22.67%) Web Services
4 14 (18.67%) Spring Boot
5 13 (17.33%) CSS
5 13 (17.33%) HTML
5 13 (17.33%) React
5 13 (17.33%) WCF
6 11 (14.67%) REST
6 11 (14.67%) SOAP
7 9 (12.00%) ASP.NET Web API
7 9 (12.00%) HTML5
7 9 (12.00%) J2EE
7 9 (12.00%) XML
8 8 (10.67%) AngularJS
8 8 (10.67%) JSON
8 8 (10.67%) RESTful
9 7 (9.33%) Hibernate
9 7 (9.33%) Node.js
9 7 (9.33%) Ruby on Rails
Miscellaneous
1 9 (12.00%) Enterprise Software
2 7 (9.33%) Algorithms
2 7 (9.33%) VHDL
3 5 (6.67%) Greenfield Project
4 1 (1.33%) Computer Science
Operating Systems
1 7 (9.33%) Unix
2 6 (8.00%) Linux
3 5 (6.67%) Solaris
4 4 (5.33%) HPUX
5 1 (1.33%) Android
Processes & Methodologies
1 68 (90.67%) Agile Software Development
2 29 (38.67%) BDD
3 27 (36.00%) Scrum
4 25 (33.33%) MVC
5 22 (29.33%) Microservices
6 19 (25.33%) SOLID
7 18 (24.00%) Continuous Integration
8 16 (21.33%) Pair Programming
9 15 (20.00%) Kanban
10 14 (18.67%) E-Commerce
11 12 (16.00%) Web Development
12 11 (14.67%) Continuous Delivery
12 11 (14.67%) OO
12 11 (14.67%) Test Automation
13 10 (13.33%) SDLC
14 9 (12.00%) Refactoring
15 8 (10.67%) Integration Testing
16 7 (9.33%) Digital Signal Processing
16 7 (9.33%) Domain-Driven Design
16 7 (9.33%) Feature Driven Development
Programming Languages
1 37 (49.33%) Java
2 18 (24.00%) C#
3 17 (22.67%) JavaScript
4 10 (13.33%) Groovy
5 9 (12.00%) Ruby
5 9 (12.00%) SQL
6 7 (9.33%) C
6 7 (9.33%) Embedded C
7 5 (6.67%) Scala
8 3 (4.00%) C++
8 3 (4.00%) VBScript
9 2 (2.67%) Python
9 2 (2.67%) VB
10 1 (1.33%) Clojure
10 1 (1.33%) Go
10 1 (1.33%) PL/SQL
10 1 (1.33%) Shell Script
10 1 (1.33%) TypeScript
Qualifications
1 3 (4.00%) Security Cleared
2 2 (2.67%) SC Cleared
Quality Assurance & Compliance
1 10 (13.33%) QA
System Software
1 9 (12.00%) Docker
Systems Management
1 4 (5.33%) Ansible
2 1 (1.33%) Opscode Chef
Vendors
1 13 (17.33%) Microsoft
2 6 (8.00%) Atlassian
2 6 (8.00%) New Relic
3 4 (5.33%) IBM
3 4 (5.33%) Oracle
3 4 (5.33%) Talend
4 3 (4.00%) Google
5 1 (1.33%) Sonatype
5 1 (1.33%) Teradata