Period
to 13 December 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 13 December 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
13 Dec 2018
Same period 2017 Same period 2016
Rank 32 32 26
Rank change year-on-year 0 -6 +33
Contract jobs citing TDD 79 86 95
As % of all contract IT jobs advertised in Hertfordshire 4.92% 5.36% 6.75%
As % of the Processes & Methodologies category 6.00% 6.47% 8.62%
Number of daily rates quoted 66 82 77
Hertfordshire median daily rate £538 £388 £525
Median daily rate % change year-on-year +38.71% -26.19% +5.00%
10th Percentile £420 £313 £358
90th Percentile £569 £538 £593
East of England median daily rate £525 £500 £463
% change year-on-year +5.00% +8.11% +8.82%
Number of hourly rates quoted 2 0 0
Hertfordshire median hourly rate £41.25 - -
East of England median hourly rate £40.00 £62.50 £38.51
% change year-on-year -36.00% +62.30% +2.83%

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 1,317 1,329 1,102
As % of all contract IT jobs advertised in Hertfordshire 82.00% 82.91% 78.32%
Number of daily rates quoted 805 675 629
Hertfordshire median daily rate £425 £400 £413
Median daily rate % change year-on-year +6.25% -3.03% -
10th Percentile £205 £206 £223
90th Percentile £569 £575 £550
East of England median daily rate £450 £425 £400
% change year-on-year +5.88% +6.25% -
Number of hourly rates quoted 72 63 58
Hertfordshire median hourly rate £17.71 £19.00 £29.75
Median hourly rate % change year-on-year -6.82% -36.13% +39.98%
10th Percentile £12.51 £13.00 £10.00
90th Percentile £48.18 £47.00 £53.75
East of England median hourly rate £17.97 £33.33 £31.50
% change year-on-year -46.08% +5.81% +29.55%

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 13 December 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 13 December 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 +2 26 £550 +41.94% 4
Welwyn Garden City -4 16 £563 +7.14% 1
Hemel Hempstead +2 5 £420 - 3
Stevenage -17 5 £400 +10.34% 2
Hitchin - 5 £510 -
St Albans +1 3 £538 +65.38% 9
Berkhamsted - 1 £525 -
TDD
East of England

For the 6 months to 13 December 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 66 (83.54%) Agile Software Development
2 41 (51.90%) Java
3 35 (44.30%) Java 8
4 33 (41.77%) BDD
4 33 (41.77%) SQL
5 30 (37.97%) AngularJS
6 29 (36.71%) Microservices
7 28 (35.44%) Test Automation
7 28 (35.44%) C#
8 27 (34.18%) JIRA
9 23 (29.11%) Git (software)
9 23 (29.11%) REST
10 22 (27.85%) Oracle
11 21 (26.58%) Migration
11 21 (26.58%) Continuous Integration
12 20 (25.32%) Subversion
12 20 (25.32%) SC Cleared
12 20 (25.32%) Security Cleared
12 20 (25.32%) Data Migration
12 20 (25.32%) Scrum
12 20 (25.32%) SQL Server
12 20 (25.32%) Scaled Agile Framework
13 17 (21.52%) Spring
13 17 (21.52%) CSS
13 17 (21.52%) JavaScript
13 17 (21.52%) MVC
13 17 (21.52%) Problem-Solving
14 16 (20.25%) Spring Boot
14 16 (20.25%) PostgreSQL
15 15 (18.99%) PL/SQL

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 3 (3.80%) NServiceBus
2 1 (1.27%) CMS
2 1 (1.27%) Confluence
2 1 (1.27%) Elasticsearch
2 1 (1.27%) Sitecore CMS
2 1 (1.27%) WebSphere
Business Applications
1 1 (1.27%) Magento
1 1 (1.27%) Oracle Assets
1 1 (1.27%) Oracle Financials
1 1 (1.27%) Oracle General Ledger
1 1 (1.27%) Oracle Payables
1 1 (1.27%) Oracle Receivables
Cloud Services
1 8 (10.13%) Amazon AWS
2 3 (3.80%) Microsoft Azure
3 1 (1.27%) Heroku
Communications & Networking
1 3 (3.80%) SpaceWire
2 1 (1.27%) DNS
2 1 (1.27%) FTP
2 1 (1.27%) HTTP
2 1 (1.27%) SSL
2 1 (1.27%) TCP/IP
Database & Business Intelligence
1 20 (25.32%) SQL Server
2 16 (20.25%) PostgreSQL
3 12 (15.19%) SQL Server Reporting Services
4 11 (13.92%) SQL Server Integration Services
5 10 (12.66%) SQL Server 2016
6 5 (6.33%) MongoDB
7 1 (1.27%) Data Warehouse
7 1 (1.27%) Redis
Development Applications
1 27 (34.18%) JIRA
2 23 (29.11%) Git (software)
3 20 (25.32%) Subversion
4 11 (13.92%) Jenkins
5 5 (6.33%) Grunt
5 5 (6.33%) gulp
6 4 (5.06%) Eclipse
6 4 (5.06%) Eclipse RCP
6 4 (5.06%) IntelliJ
6 4 (5.06%) NUnit
6 4 (5.06%) ReSharper
6 4 (5.06%) Visual Studio
7 2 (2.53%) Jasmine
7 2 (2.53%) JUnit
8 1 (1.27%) Bower
8 1 (1.27%) GitLab
8 1 (1.27%) Gradle
8 1 (1.27%) Karma Test Runner
8 1 (1.27%) Redmine
8 1 (1.27%) Team Foundation Server
General
1 13 (16.46%) Finance
2 7 (8.86%) Retail
3 3 (3.80%) Avionics
4 2 (2.53%) Aerospace
5 1 (1.27%) Advertising
Job Titles
1 72 (91.14%) Developer
2 37 (46.84%) Java Developer
3 21 (26.58%) Senior Developer
3 21 (26.58%) SQL Developer
4 20 (25.32%) Data Migration Developer
5 19 (24.05%) Senior Java Developer
6 15 (18.99%) ETL Developer
6 15 (18.99%) Oracle Developer
6 15 (18.99%) Oracle ETL Developer
6 15 (18.99%) PostgreSQL Developer
6 15 (18.99%) SQL Server Developer
7 9 (11.39%) .NET Developer
8 8 (10.13%) Angular Developer
9 6 (7.59%) Agile Developer
9 6 (7.59%) Agile Java Developer
9 6 (7.59%) Analyst
9 6 (7.59%) Backend Developer
9 6 (7.59%) C# .NET Developer
9 6 (7.59%) C# Developer
10 5 (6.33%) Software Developer
Libraries, Frameworks & Software Standards
1 30 (37.97%) AngularJS
2 23 (29.11%) REST
3 17 (21.52%) CSS
3 17 (21.52%) Spring
4 16 (20.25%) Spring Boot
5 15 (18.99%) XML
6 14 (17.72%) .NET
6 14 (17.72%) SOAP
7 11 (13.92%) Dropwizard
7 11 (13.92%) HTML
8 10 (12.66%) JSON
8 10 (12.66%) Web Services
9 8 (10.13%) Angular 2
9 8 (10.13%) ASP.NET
9 8 (10.13%) ASP.NET Web API
9 8 (10.13%) CSS3
9 8 (10.13%) HTML5
10 7 (8.86%) jQuery
10 7 (8.86%) React
11 5 (6.33%) .NET Framework
Miscellaneous
1 15 (18.99%) Greenfield Project
1 15 (18.99%) Reference Data
2 10 (12.66%) Analytical Skills
3 4 (5.06%) Client/Server
3 4 (5.06%) Self-Motivation
4 3 (3.80%) Machine to Machine
5 1 (1.27%) Fintech
5 1 (1.27%) User Experience
5 1 (1.27%) Vector Graphics
5 1 (1.27%) W3C
Operating Systems
1 4 (5.06%) Windows
2 2 (2.53%) Linux
Processes & Methodologies
1 66 (83.54%) Agile Software Development
2 33 (41.77%) BDD
3 29 (36.71%) Microservices
4 28 (35.44%) Test Automation
5 21 (26.58%) Continuous Integration
5 21 (26.58%) Migration
6 20 (25.32%) Data Migration
6 20 (25.32%) Scaled Agile Framework
6 20 (25.32%) Scrum
7 17 (21.52%) MVC
7 17 (21.52%) Problem-Solving
8 15 (18.99%) Data Mapping
8 15 (18.99%) ETL
8 15 (18.99%) Kanban
8 15 (18.99%) Software Engineering
9 12 (15.19%) Continuous Delivery
10 10 (12.66%) DevOps
10 10 (12.66%) E-Commerce
11 9 (11.39%) Digital Transformation Programme
12 8 (10.13%) SOLID
Programming Languages
1 41 (51.90%) Java
2 35 (44.30%) Java 8
3 33 (41.77%) SQL
4 28 (35.44%) C#
5 17 (21.52%) JavaScript
6 15 (18.99%) PL/SQL
7 13 (16.46%) T-SQL
8 6 (7.59%) Groovy
9 3 (3.80%) ES6
10 2 (2.53%) C
10 2 (2.53%) TypeScript
11 1 (1.27%) Scala
Qualifications
1 20 (25.32%) SC Cleared
1 20 (25.32%) Security Cleared
2 2 (2.53%) Computer Science Degree
2 2 (2.53%) Degree
Quality Assurance & Compliance
1 8 (10.13%) QA
2 5 (6.33%) Data Quality
3 3 (3.80%) ECSS
3 3 (3.80%) MIL-STD-1553
System Software
1 5 (6.33%) Docker
Systems Management
1 1 (1.27%) Docker Swarm
1 1 (1.27%) Kubernetes
Vendors
1 22 (27.85%) Oracle
2 15 (18.99%) Talend
3 4 (5.06%) New Relic
4 3 (3.80%) Microsoft
5 1 (1.27%) hybris
5 1 (1.27%) IBM
5 1 (1.27%) Sitecore
5 1 (1.27%) Xerox