Period
to 18 January 2019

The following table provides summary statistics for contract job vacancies advertised in the City of London with a requirement for Chai skills. Included is a benchmarking guide to the contractor rates offered in vacancies that have cited Chai over the 6 months to 18 January 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.

Chai Assertion Library (Chai.js)
Central London > City of London
6 months to
18 Jan 2019
Same period 2018 Same period 2017
Rank 223 234 224
Rank change year-on-year +11 -10 +20
Contract jobs citing Chai 24 16 12
As % of all contract IT jobs advertised in the City of London 0.35% 0.23% 0.19%
As % of the Libraries, Frameworks & Software Standards category 0.90% 0.59% 0.53%
Number of daily rates quoted 19 14 3
City of London median daily rate £475 £519 £450
Median daily rate % change year-on-year -8.43% +15.28% +20.00%
10th Percentile £406 £443 £425
90th Percentile £594 £600 £555
Central London median daily rate £488 £503 £538
% change year-on-year -2.99% -6.51% +43.33%
Number of hourly rates quoted 0 0 0
City of London median hourly rate - - -
Central London median hourly rate - - -

Chai is in the Software Libraries and Frameworks category. The following table is for comparison with the above and provides summary statistics for all contract job vacancies advertised in the City of London with a requirement for technical specification, industry standards, software libraries and framework skills.

All Software Libraries and Frameworks
City of London
Contract vacancies with a requirement for technical specification, industry standards, software libraries and framework skills 2,675 2,698 2,259
As % of all contract IT jobs advertised in the City of London 39.32% 38.18% 36.21%
Number of daily rates quoted 2,228 2,296 1,904
City of London median daily rate £525 £513 £475
Median daily rate % change year-on-year +2.44% +7.89% -
10th Percentile £408 £363 £326
90th Percentile £668 £663 £650
Central London median daily rate £525 £500 £475
% change year-on-year +5.00% +5.26% +5.56%
Number of hourly rates quoted 3 6 2
City of London median hourly rate £19.00 £27.55 £52.12
Median hourly rate % change year-on-year -31.02% -47.15% +30.31%
10th Percentile £14.90 £21.00 £45.66
90th Percentile £84.50 £57.88 £56.68
Central London median hourly rate £27.00 £27.09 £52.12
% change year-on-year -0.33% -48.03% +30.31%

Chai
Job Vacancy Trend in the City of London

Job postings citing Chai as a percentage of all IT jobs advertised in the City of London.

Job vacancy trend for Chai in the City of London

Chai
Contractor Daily Rate Trend in the City of London

This chart provides the 3-month moving average for daily rates quoted in contract jobs citing Chai in the City of London.

Contractor daily rate trend for Chai in the City of London

Chai
Contractor Daily Rate Histogram in the City of London

The daily rate distribution of IT jobs citing Chai in the City of London over the 6 months to 18 January 2019.

Contractor daily rate histogram for Chai in the City of London

For the 6 months to 18 January 2019, IT contractor jobs citing Chai 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 City of London region with a requirement for Chai.

1 20 (83.33%) Mocha
2 19 (79.17%) JavaScript
3 18 (75.00%) Node.js
4 17 (70.83%) TDD
5 13 (54.17%) Unit Testing
5 13 (54.17%) React
5 13 (54.17%) Jest
6 12 (50.00%) HTML
7 11 (45.83%) CSS
8 10 (41.67%) Agile Software Development
8 10 (41.67%) Git (software)
9 9 (37.50%) HTML5
9 9 (37.50%) Redux
10 8 (33.33%) Greenfield Project
10 8 (33.33%) Sass
10 8 (33.33%) LESS
11 7 (29.17%) Selenium
11 7 (29.17%) Java
11 7 (29.17%) gulp
12 6 (25.00%) webpack
12 6 (25.00%) Front End Development
12 6 (25.00%) Jenkins
12 6 (25.00%) Browserify
12 6 (25.00%) RESTful
13 5 (20.83%) BDD
13 5 (20.83%) AngularJS
13 5 (20.83%) JIRA
13 5 (20.83%) Spring
13 5 (20.83%) Protractor
14 4 (16.67%) Spring Boot

Chai
Co-occurring IT Skills in the City of London 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 (16.67%) Confluence
2 1 (4.17%) Cloud Foundry
2 1 (4.17%) CMS
2 1 (4.17%) EPiServer
2 1 (4.17%) Mule
2 1 (4.17%) Tomcat
2 1 (4.17%) WebSphere
Cloud Services
1 3 (12.50%) Amazon AWS
2 2 (8.33%) Datadog
2 2 (8.33%) GitHub
2 2 (8.33%) Microsoft Azure
2 2 (8.33%) npm
2 2 (8.33%) Serverless
3 1 (4.17%) AWS Lambda
3 1 (4.17%) BrowserStack
3 1 (4.17%) Dynamics 365
3 1 (4.17%) IaaS
3 1 (4.17%) PaaS
3 1 (4.17%) Sauce Labs
3 1 (4.17%) Slack
Communications & Networking
1 2 (8.33%) HTTP
2 1 (4.17%) HTTPS
Database & Business Intelligence
1 3 (12.50%) MongoDB
2 2 (8.33%) Couchbase
2 2 (8.33%) PostgreSQL
3 1 (4.17%) Big Data
3 1 (4.17%) MySQL
3 1 (4.17%) NoSQL
3 1 (4.17%) Relational Database
3 1 (4.17%) SQL Server
Development Applications
1 20 (83.33%) Mocha
2 10 (41.67%) Git (software)
3 7 (29.17%) gulp
3 7 (29.17%) Selenium
4 6 (25.00%) Jenkins
4 6 (25.00%) webpack
5 5 (20.83%) JIRA
5 5 (20.83%) Protractor
6 4 (16.67%) WebDriver
7 3 (12.50%) Jasmine
8 2 (8.33%) Cucumber
8 2 (8.33%) JUnit
8 2 (8.33%) Karma Test Runner
8 2 (8.33%) Sinon.JS
9 1 (4.17%) JMeter
9 1 (4.17%) jMock
9 1 (4.17%) LoadRunner
9 1 (4.17%) Maven
9 1 (4.17%) TeamCity
9 1 (4.17%) Visual Studio
General
1 3 (12.50%) Banking
2 1 (4.17%) Retail
Job Titles
1 16 (66.67%) Developer
2 8 (33.33%) Full Stack Developer
3 5 (20.83%) Front End Developer (Client-Side Developer)
3 5 (20.83%) JavaScript Engineer
4 4 (16.67%) Senior Developer
5 3 (12.50%) Senior Front-End Developer
6 2 (8.33%) Automation Engineer
6 2 (8.33%) Java Developer
7 1 (4.17%) Angular Developer
7 1 (4.17%) Digital Developer
7 1 (4.17%) Open Source Developer
7 1 (4.17%) QA Engineer
7 1 (4.17%) QA Manager
7 1 (4.17%) QA Test Engineer
7 1 (4.17%) Senior Java Developer
7 1 (4.17%) Software Engineer
7 1 (4.17%) Test Engineer
Libraries, Frameworks & Software Standards
1 18 (75.00%) Node.js
2 13 (54.17%) Jest
2 13 (54.17%) React
3 12 (50.00%) HTML
4 11 (45.83%) CSS
5 9 (37.50%) HTML5
5 9 (37.50%) Redux
6 8 (33.33%) LESS
6 8 (33.33%) Sass
7 6 (25.00%) Browserify
7 6 (25.00%) RESTful
8 5 (20.83%) AngularJS
8 5 (20.83%) Spring
9 4 (16.67%) SOAP
9 4 (16.67%) Spring Boot
10 3 (12.50%) Enzyme
10 3 (12.50%) REST
10 3 (12.50%) Web Services
10 3 (12.50%) WebdriverIO
11 2 (8.33%) CSS3
Miscellaneous
1 8 (33.33%) Greenfield Project
2 3 (12.50%) User Experience
3 2 (8.33%) Fintech
3 2 (8.33%) Mobile App
4 1 (4.17%) Algorithms
4 1 (4.17%) Cloud Native
4 1 (4.17%) Data Structures
Operating Systems
1 1 (4.17%) Unix
Processes & Methodologies
1 17 (70.83%) TDD
2 13 (54.17%) Unit Testing
3 10 (41.67%) Agile Software Development
4 6 (25.00%) Front End Development
5 5 (20.83%) BDD
6 4 (16.67%) Scrum
6 4 (16.67%) SOA
6 4 (16.67%) Test Automation
7 3 (12.50%) DevOps
7 3 (12.50%) E-Commerce
7 3 (12.50%) OOP
7 3 (12.50%) Software Engineering
8 2 (8.33%) API Testing
8 2 (8.33%) Asynchronous Programming
8 2 (8.33%) Defect Management
8 2 (8.33%) MVC
8 2 (8.33%) Problem-Solving
8 2 (8.33%) SDET
8 2 (8.33%) Use Case
8 2 (8.33%) Web Application Development
Programming Languages
1 19 (79.17%) JavaScript
2 7 (29.17%) Java
3 3 (12.50%) ES6
4 2 (8.33%) Java 8
4 2 (8.33%) SQL
5 1 (4.17%) Go
5 1 (4.17%) Perl
5 1 (4.17%) PHP
5 1 (4.17%) PL/SQL
5 1 (4.17%) Python
Qualifications
1 1 (4.17%) BPSS Clearance
1 1 (4.17%) Degree
1 1 (4.17%) SAFe Agilist
1 1 (4.17%) SC Cleared
1 1 (4.17%) Security Cleared
Quality Assurance & Compliance
1 3 (12.50%) QA
System Software
1 4 (16.67%) Docker
Systems Management
1 1 (4.17%) Docker Swarm
Vendors
1 3 (12.50%) Splunk
2 2 (8.33%) New Relic
3 1 (4.17%) AppDynamics
3 1 (4.17%) Cypress Semiconductor
3 1 (4.17%) Perfecto Mobile