Period
to 20 November 2017

The following table provides summary statistics for contract job vacancies advertised in Welwyn Garden City 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 20 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)
Hertfordshire > Welwyn Garden City
6 months to
20 Nov 2017
Same period 2016 Same period 2015
Rank 14 12 24
Rank change year-on-year -2 +12 -10
Contract jobs citing TDD 8 12 1
As % of all contract IT jobs advertised in Welwyn Garden City 6.15% 7.74% 0.82%
As % of the Processes & Methodologies category 7.92% 9.02% 0.94%
Number of daily rates quoted 5 10 1
Welwyn Garden City median daily rate £525 £575 £550
Median daily rate % change year-on-year -8.70% +4.55% +25.71%
10th Percentile £513 £463 £535
90th Percentile £538 £728 £565
Hertfordshire median daily rate £388 £525 £500
% change year-on-year -26.19% +5.00% +25.00%
Number of hourly rates quoted 0 0 0
Welwyn Garden City median hourly rate - - -
Hertfordshire median hourly rate - - -

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 Welwyn Garden City with a requirement for process or methodology skills.

All Process and Methodology Skills
Welwyn Garden City
Contract vacancies with a requirement for process or methodology skills 101 133 106
As % of all contract IT jobs advertised in Welwyn Garden City 77.69% 85.81% 86.89%
Number of daily rates quoted 59 82 49
Welwyn Garden City median daily rate £413 £425 £375
Median daily rate % change year-on-year -2.94% +13.33% +31.00%
10th Percentile £161 £255 £247
90th Percentile £555 £575 £600
Hertfordshire median daily rate £400 £411 £400
% change year-on-year -2.74% +2.81% +6.67%
Number of hourly rates quoted 3 3 3
Welwyn Garden City median hourly rate £15.86 £20.00 £47.50
Median hourly rate % change year-on-year -20.70% -57.89% +193.21%
10th Percentile £13.41 £18.80 £15.63
90th Percentile £17.63 £29.20 £134.25
Hertfordshire median hourly rate £18.00 £31.00 £21.00
% change year-on-year -41.94% +47.60% +30.45%

TDD
Job Vacancy Trend in Welwyn Garden City

Job postings citing TDD as a percentage of all IT jobs advertised in Welwyn Garden City.

Job vacancy trend for TDD in Welwyn Garden City

TDD
Contractor Daily Rate Trend in Welwyn Garden City

This chart provides the 3-month moving average for daily rates quoted in contract jobs citing TDD in Welwyn Garden City.

Contractor daily rate trend for TDD in Welwyn Garden City

For the 6 months to 20 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 Welwyn Garden City region with a requirement for TDD.

1 8 (100.00%) Web Services
1 8 (100.00%) Agile Software Development
2 7 (87.50%) Amazon AWS
2 7 (87.50%) BDD
2 7 (87.50%) Microservices
3 6 (75.00%) QA
3 6 (75.00%) Continuous Integration
4 5 (62.50%) Kanban
4 5 (62.50%) Scrum
4 5 (62.50%) Java
5 4 (50.00%) JavaScript
5 4 (50.00%) Spring
5 4 (50.00%) RESTful
5 4 (50.00%) NoSQL
6 3 (37.50%) MongoDB
6 3 (37.50%) Apache Cassandra
6 3 (37.50%) Big Data
6 3 (37.50%) Web Application Development
6 3 (37.50%) Data Analytics
6 3 (37.50%) AngularJS
6 3 (37.50%) Analytics
6 3 (37.50%) Apache Spark
6 3 (37.50%) Loose Coupling
6 3 (37.50%) Grunt
6 3 (37.50%) Play Framework
6 3 (37.50%) Scalatra
6 3 (37.50%) New Relic
6 3 (37.50%) Spring Boot
6 3 (37.50%) Spark Streaming
6 3 (37.50%) gulp

TDD
Co-occurring IT Skills in Welwyn Garden City 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 (37.50%) Apache Spark
Cloud Services
1 7 (87.50%) Amazon AWS
2 2 (25.00%) Amazon EC2
3 1 (12.50%) Amazon SQS
Database & Business Intelligence
1 4 (50.00%) NoSQL
2 3 (37.50%) Apache Cassandra
2 3 (37.50%) Big Data
2 3 (37.50%) MongoDB
Development Applications
1 3 (37.50%) Git (software)
1 3 (37.50%) Grunt
1 3 (37.50%) gulp
1 3 (37.50%) IntelliJ
2 1 (12.50%) Jenkins
2 1 (12.50%) Maven
General
1 1 (12.50%) Retail
Job Titles
1 8 (100.00%) Developer
2 5 (62.50%) Java Developer
3 3 (37.50%) Database Developer
4 1 (12.50%) Agile Developer
4 1 (12.50%) Agile Java Developer
4 1 (12.50%) AWS Developer
Libraries, Frameworks & Software Standards
1 8 (100.00%) Web Services
2 4 (50.00%) RESTful
2 4 (50.00%) Spring
3 3 (37.50%) AngularJS
3 3 (37.50%) CSS
3 3 (37.50%) Dropwizard
3 3 (37.50%) HTML
3 3 (37.50%) HTML5
3 3 (37.50%) Hystrix
3 3 (37.50%) Play Framework
3 3 (37.50%) React
3 3 (37.50%) Scalatra
3 3 (37.50%) Spark Streaming
3 3 (37.50%) Spring Boot
3 3 (37.50%) Spring Cloud
4 1 (12.50%) Hibernate
4 1 (12.50%) J2EE
Processes & Methodologies
1 8 (100.00%) Agile Software Development
2 7 (87.50%) BDD
2 7 (87.50%) Microservices
3 6 (75.00%) Continuous Integration
4 5 (62.50%) Kanban
4 5 (62.50%) Scrum
5 3 (37.50%) Data Analytics
5 3 (37.50%) Data Modelling
5 3 (37.50%) Domain-Driven Design
5 3 (37.50%) Front End Development
5 3 (37.50%) Loose Coupling
5 3 (37.50%) MVC
5 3 (37.50%) Pair Programming
5 3 (37.50%) Refactoring
5 3 (37.50%) SOA
5 3 (37.50%) Software Engineering
5 3 (37.50%) SOLID
5 3 (37.50%) Test Automation
5 3 (37.50%) Web Application Development
5 3 (37.50%) Web Development
Programming Languages
1 5 (62.50%) Java
2 4 (50.00%) JavaScript
3 3 (37.50%) Groovy
3 3 (37.50%) SQL
4 1 (12.50%) Ruby
4 1 (12.50%) Scala
Quality Assurance & Compliance
1 6 (75.00%) QA
Vendors
1 3 (37.50%) New Relic