Period
to 24 March 2019

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 24 March 2019 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
24 Mar 2019
Same period 2018 Same period 2017
Rank 59 21 10
Rank change year-on-year -38 -11 +39
Contract jobs citing TDD 38 102 131
As % of all contract IT jobs advertised in Hertfordshire 2.84% 6.61% 10.32%
As % of the Processes & Methodologies category 3.47% 8.01% 12.92%
Number of daily rates quoted 24 77 109
Hertfordshire median daily rate £550 £525 £525
Median daily rate % change year-on-year +4.76% - -1.18%
East of England median daily rate £510 £513 £463
% change year-on-year -0.49% +10.81% +8.82%
Number of hourly rates quoted 1 0 0
Hertfordshire median hourly rate £40.00 - -
East of England median hourly rate £62.30 £50.00 £37.00
% change year-on-year +24.60% +35.14% +1.37%

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 1,095 1,274 1,014
As % of all contract IT jobs advertised in Hertfordshire 81.90% 82.57% 79.91%
Number of daily rates quoted 621 670 568
Hertfordshire median daily rate £440 £400 £450
Median daily rate % change year-on-year +10.00% -11.11% +9.09%
10th Percentile £250 £206 £212
90th Percentile £575 £575 £575
East of England median daily rate £450 £425 £400
% change year-on-year +5.88% +6.25% -1.42%
Number of hourly rates quoted 58 68 56
Hertfordshire median hourly rate £27.00 £17.50 £42.35
Median hourly rate % change year-on-year +54.29% -58.68% +96.98%
10th Percentile £11.16 £11.44 £11.32
90th Percentile £66.81 £47.25 £53.75
East of England median hourly rate £19.25 £25.00 £33.50
% change year-on-year -23.00% -25.37% +29.47%

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 24 March 2019.

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 24 March 2019. 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 -4 17 £550 +29.41% 1
Stevenage +4 13 £475 +66.67% 1
Welwyn Garden City -5 1 £563 +7.14%
Berkhamsted - 1 £525 -
Hitchin - 1 £515 -
TDD
East of England

For the 6 months to 24 March 2019, 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 26 (68.42%) Agile Software Development
2 17 (44.74%) BDD
3 14 (36.84%) SQL
3 14 (36.84%) Problem-Solving
4 13 (34.21%) Java
4 13 (34.21%) Test Automation
5 12 (31.58%) Scrum
6 11 (28.95%) Migration
6 11 (28.95%) SC Cleared
6 11 (28.95%) Security Cleared
6 11 (28.95%) Data Migration
6 11 (28.95%) Scaled Agile Framework
7 9 (23.68%) 5G
7 9 (23.68%) Subversion
7 9 (23.68%) LTE
7 9 (23.68%) Feature Driven Development
7 9 (23.68%) C
7 9 (23.68%) 3GPP
8 8 (21.05%) C++
8 8 (21.05%) JavaScript
8 8 (21.05%) Embedded C
8 8 (21.05%) JIRA
9 7 (18.42%) Wireless
9 7 (18.42%) SQL Server
9 7 (18.42%) C#
9 7 (18.42%) Data Modelling
9 7 (18.42%) Algorithms
10 6 (15.79%) AngularJS
10 6 (15.79%) Analytical Skills
10 6 (15.79%) Analytical Thinking

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 4 (10.53%) CMS
1 4 (10.53%) Sitecore CMS
1 4 (10.53%) WebSphere
2 1 (2.63%) Confluence
2 1 (2.63%) NServiceBus
Business Applications
1 4 (10.53%) Magento
Communications & Networking
1 9 (23.68%) 3GPP
1 9 (23.68%) 5G
1 9 (23.68%) LTE
2 7 (18.42%) Wireless
3 3 (7.89%) SpaceWire
4 2 (5.26%) NAS
5 1 (2.63%) FTP
5 1 (2.63%) HTTP
5 1 (2.63%) RTP
5 1 (2.63%) UTRAN
Database & Business Intelligence
1 7 (18.42%) SQL Server
2 6 (15.79%) PostgreSQL
3 5 (13.16%) SQL Server 2016
3 5 (13.16%) SQL Server Integration Services
3 5 (13.16%) SQL Server Reporting Services
4 2 (5.26%) Redis
5 1 (2.63%) MongoDB
5 1 (2.63%) NoSQL
Development Applications
1 9 (23.68%) Subversion
2 8 (21.05%) JIRA
3 6 (15.79%) Git (software)
4 5 (13.16%) Jasmine
4 5 (13.16%) Karma Test Runner
5 4 (10.53%) Bower
5 4 (10.53%) Eclipse
5 4 (10.53%) Eclipse RCP
5 4 (10.53%) Grunt
6 1 (2.63%) ClearCase
6 1 (2.63%) ClearQuest
6 1 (2.63%) Jenkins
6 1 (2.63%) JUnit
6 1 (2.63%) Maven
General
1 4 (10.53%) Aerospace
1 4 (10.53%) Avionics
2 2 (5.26%) Finance
2 2 (5.26%) Manufacturing
3 1 (2.63%) Games
3 1 (2.63%) Retail
3 1 (2.63%) Telecoms
Job Titles
1 32 (84.21%) Developer
2 11 (28.95%) Data Migration Developer
2 11 (28.95%) SQL Developer
3 6 (15.79%) Analyst
3 6 (15.79%) Analyst Developer
3 6 (15.79%) Data Analyst
3 6 (15.79%) Data Migration Analyst
3 6 (15.79%) Developer Analyst
3 6 (15.79%) Front End Developer (Client-Side Developer)
3 6 (15.79%) Java Developer
3 6 (15.79%) Migration Analyst
3 6 (15.79%) SQL Analyst
3 6 (15.79%) SQL Data Analyst
4 5 (13.16%) ETL Developer
4 5 (13.16%) Oracle Developer
4 5 (13.16%) Oracle ETL Developer
4 5 (13.16%) PostgreSQL Developer
4 5 (13.16%) SQL Server Developer
5 3 (7.89%) Software Developer
6 2 (5.26%) Senior Java Developer
Libraries, Frameworks & Software Standards
1 6 (15.79%) AngularJS
1 6 (15.79%) CSS
1 6 (15.79%) HTML
1 6 (15.79%) JSON
2 5 (13.16%) jQuery
2 5 (13.16%) Twitter Bootstrap
2 5 (13.16%) XML
3 4 (10.53%) Dojo
3 4 (10.53%) LESS
3 4 (10.53%) REST
3 4 (10.53%) Sass
3 4 (10.53%) XHTML
4 3 (7.89%) Akka
4 3 (7.89%) KnockoutJS
4 3 (7.89%) Semantic HTML
5 2 (5.26%) ASP.NET Web API
5 2 (5.26%) Entity Framework
5 2 (5.26%) Node.js
5 2 (5.26%) React
5 2 (5.26%) RESTful
Miscellaneous
1 7 (18.42%) Algorithms
2 6 (15.79%) Analytical Skills
3 5 (13.16%) Reference Data
3 5 (13.16%) User Experience
4 4 (10.53%) Client/Server
4 4 (10.53%) Machine to Machine
4 4 (10.53%) Vector Graphics
4 4 (10.53%) W3C
5 2 (5.26%) Self-Motivation
6 1 (2.63%) Fintech
6 1 (2.63%) Greenfield Project
Processes & Methodologies
1 26 (68.42%) Agile Software Development
2 17 (44.74%) BDD
3 14 (36.84%) Problem-Solving
4 13 (34.21%) Test Automation
5 12 (31.58%) Scrum
6 11 (28.95%) Data Migration
6 11 (28.95%) Migration
6 11 (28.95%) Scaled Agile Framework
7 9 (23.68%) Feature Driven Development
8 7 (18.42%) Data Modelling
9 6 (15.79%) Analytical Thinking
9 6 (15.79%) Statistics
10 5 (13.16%) Data Mapping
10 5 (13.16%) E-Commerce
10 5 (13.16%) ETL
10 5 (13.16%) Front End Development
10 5 (13.16%) UML
10 5 (13.16%) Unit Testing
11 4 (10.53%) OOA/OOD
11 4 (10.53%) OOP
Programming Languages
1 14 (36.84%) SQL
2 13 (34.21%) Java
3 9 (23.68%) C
4 8 (21.05%) C++
4 8 (21.05%) Embedded C
4 8 (21.05%) JavaScript
5 7 (18.42%) C#
6 6 (15.79%) T-SQL
7 5 (13.16%) PL/SQL
8 3 (7.89%) Java 8
9 2 (5.26%) ES6
9 2 (5.26%) PHP
9 2 (5.26%) Scala
10 1 (2.63%) MATLAB
Qualifications
1 11 (28.95%) SC Cleared
1 11 (28.95%) Security Cleared
2 3 (7.89%) Degree
3 1 (2.63%) Computer Science Degree
Quality Assurance & Compliance
1 6 (15.79%) Data Quality
2 3 (7.89%) ECSS
2 3 (7.89%) MIL-STD-1553
3 1 (2.63%) QA
System Software
1 3 (7.89%) Docker
Systems Management
1 1 (2.63%) Kubernetes
Vendors
1 5 (13.16%) Oracle
1 5 (13.16%) Talend
2 4 (10.53%) IBM
2 4 (10.53%) Sitecore
3 2 (5.26%) hybris
4 1 (2.63%) Xerox