Period
to 22 April 2021

The following table provides summary statistics for contract job vacancies advertised in the City of London with a requirement for Kotlin skills. Included is a benchmarking guide to the contractor rates offered in vacancies that have cited Kotlin over the 6 months to 22 April 2021 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.

JetBrains Kotlin
Central London > City of London
6 months to
22 Apr 2021
Same period 2020 Same period 2019
Rank 83 107 173
Rank change year-on-year +24 +66 +33
Contract jobs citing Kotlin 59 61 75
As % of all contract jobs advertised in the City of London 2.36% 1.60% 1.12%
As % of the Programming Languages category 4.99% 3.27% 2.20%
Number of daily rates quoted 47 55 67
10th Percentile £380 £389 £432
25th Percentile £463 £463 £485
Median daily rate (50th Percentile) £563 £550 £580
Median % change year-on-year +2.27% -5.17% -5.31%
75th Percentile £649 £631 £706
90th Percentile £750 £638 £750
Central London median daily rate £556 £550 £600
% change year-on-year +1.14% -8.33% +1.27%
Number of hourly rates quoted 0 1 0
Median hourly rate - £55.00 -
Central London median hourly rate - £55.00 -

Kotlin is in the Programming Languages 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 coding skills.

All Programming Languages
City of London
Contract vacancies with a requirement for coding skills 1,183 1,867 3,413
As % of all contract IT jobs advertised in the City of London 47.32% 49.00% 50.83%
Number of daily rates quoted 891 1,477 2,767
10th Percentile £363 £380 £400
25th Percentile £450 £450 £463
Median daily rate (50th Percentile) £550 £525 £525
Median % change year-on-year +4.76% - -
75th Percentile £638 £625 £619
90th Percentile £713 £688 £675
Central London median daily rate £550 £525 £525
% change year-on-year +4.76% - +2.44%
Number of hourly rates quoted 3 13 18
10th Percentile £15.55 £24.50 £15.84
25th Percentile £17.86 £26.75 "
Median hourly rate £23.45 £47.50 £21.00
Median % change year-on-year -50.63% +126.19% -2.33%
75th Percentile £31.21 £53.00 £37.50
90th Percentile £34.84 £57.30 £43.20
Central London median hourly rate £21.73 £43.00 £21.00
% change year-on-year -49.48% +104.76% -2.33%

Kotlin
Job Vacancy Trend in the City of London

Job postings citing Kotlin as a proportion of all IT jobs advertised in the City of London.

Job vacancy trend for Kotlin in the City of London

Kotlin
Contractor Daily Rate Trend in the City of London

3-month moving average daily rate quoted in jobs citing Kotlin in the City of London.

Daily rate trend for Kotlin in the City of London

Kotlin
Daily Rate Histogram in the City of London

Daily rate distribution for jobs citing Kotlin in the City of London over the 6 months to 22 April 2021.

Daily rate histogram for Kotlin in the City of London

For the 6 months to 22 April 2021, IT contractor jobs citing Kotlin 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 Kotlin.

1 44 (74.58%) Java
2 21 (35.59%) TDD
2 21 (35.59%) Android
3 16 (27.12%) Software Engineering
4 15 (25.42%) Agile Software Development
5 14 (23.73%) RESTful
5 14 (23.73%) Microservices
6 13 (22.03%) Android Development
7 12 (20.34%) Mobile App
7 12 (20.34%) RxJava
7 12 (20.34%) Spring
8 11 (18.64%) TypeScript
8 11 (18.64%) Greenfield Project
9 10 (16.95%) Continuous Integration
10 9 (15.25%) React
11 8 (13.56%) Pair Programming
11 8 (13.56%) Multithreading
11 8 (13.56%) AWS
12 7 (11.86%) Scala
12 7 (11.86%) MVVM
12 7 (11.86%) Banking
12 7 (11.86%) XML
12 7 (11.86%) Continuous Delivery
12 7 (11.86%) Spring Boot
13 6 (10.17%) Mobile Development
13 6 (10.17%) JSON
13 6 (10.17%) REST
13 6 (10.17%) Android SDK
14 5 (8.47%) DevOps
14 5 (8.47%) MongoDB

Kotlin
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:

Cloud Services
1 8 (13.56%) AWS
2 4 (6.78%) Azure
2 4 (6.78%) GitHub
3 3 (5.08%) Slack
4 1 (1.69%) Amazon ECS
4 1 (1.69%) AWS Lambda
4 1 (1.69%) GCP
4 1 (1.69%) SaaS
4 1 (1.69%) Serverless
Communications & Networking
1 1 (1.69%) Wi-Fi
Database & Business Intelligence
1 5 (8.47%) MongoDB
2 2 (3.39%) NoSQL
2 2 (3.39%) SQLite
3 1 (1.69%) Apache Hive
3 1 (1.69%) Big Data
3 1 (1.69%) HBase
Development Applications
1 4 (6.78%) JIRA
1 4 (6.78%) JUnit
1 4 (6.78%) Mockito
2 3 (5.08%) Android Studio
2 3 (5.08%) Appium
2 3 (5.08%) Xcode
3 2 (3.39%) Git (software)
3 2 (3.39%) Jenkins
4 1 (1.69%) Cucumber
4 1 (1.69%) Eclipse
4 1 (1.69%) Gradle
4 1 (1.69%) Maven
4 1 (1.69%) Selenium
4 1 (1.69%) Storybook
4 1 (1.69%) TeamCity
4 1 (1.69%) webpack
General
1 7 (11.86%) Banking
2 5 (8.47%) Finance
2 5 (8.47%) Games
3 4 (6.78%) Investment Banking
4 3 (5.08%) Front Office
5 2 (3.39%) Multimedia
6 1 (1.69%) Aerospace
6 1 (1.69%) Publishing
Job Titles
1 44 (74.58%) Developer
2 12 (20.34%) Android Developer
3 11 (18.64%) Java Developer
4 9 (15.25%) Senior Developer
5 6 (10.17%) Senior Android Developer
6 5 (8.47%) Android Engineer
6 5 (8.47%) React Developer
7 4 (6.78%) Applications Engineer
7 4 (6.78%) Software Engineer
8 3 (5.08%) .NET Developer
8 3 (5.08%) C# .NET Developer
8 3 (5.08%) C# Developer
8 3 (5.08%) Full Stack Developer
8 3 (5.08%) Investment Banking Java Developer
8 3 (5.08%) Java Android Developer
8 3 (5.08%) Software Test Engineer
8 3 (5.08%) Technical Leader
8 3 (5.08%) Test Engineer
9 2 (3.39%) Digital Developer
9 2 (3.39%) JavaScript Developer
Libraries, Frameworks & Software Standards
1 14 (23.73%) RESTful
2 12 (20.34%) RxJava
2 12 (20.34%) Spring
3 9 (15.25%) React
4 7 (11.86%) Spring Boot
4 7 (11.86%) XML
5 6 (10.17%) Android SDK
5 6 (10.17%) JSON
5 6 (10.17%) REST
6 5 (8.47%) GraphQL
7 4 (6.78%) AngularJS
7 4 (6.78%) Dagger
7 4 (6.78%) Kafka
8 3 (5.08%) .NET
8 3 (5.08%) .NET Core
8 3 (5.08%) ASP.NET Web API
9 1 (1.69%) CSS
9 1 (1.69%) Node.js
9 1 (1.69%) Ruby on Rails
9 1 (1.69%) Web Services
Miscellaneous
1 12 (20.34%) Mobile App
2 11 (18.64%) Greenfield Project
3 4 (6.78%) Analytical Skills
3 4 (6.78%) Foreign Exchange (FX)
3 4 (6.78%) User Experience
4 3 (5.08%) Mobile Payment
5 2 (3.39%) Equities
6 1 (1.69%) Derivative
6 1 (1.69%) Equity Derivative
Operating Systems
1 21 (35.59%) Android
2 2 (3.39%) Apple iOS
Processes & Methodologies
1 21 (35.59%) TDD
2 16 (27.12%) Software Engineering
3 15 (25.42%) Agile Software Development
4 14 (23.73%) Microservices
5 13 (22.03%) Android Development
6 10 (16.95%) Continuous Integration
7 8 (13.56%) Multithreading
7 8 (13.56%) Pair Programming
8 7 (11.86%) Continuous Delivery
8 7 (11.86%) MVVM
9 6 (10.17%) Mobile Development
10 5 (8.47%) BDD
10 5 (8.47%) Dependency Injection
10 5 (8.47%) DevOps
10 5 (8.47%) Fintech
11 4 (6.78%) E-business
11 4 (6.78%) Extreme Programming
11 4 (6.78%) OO
11 4 (6.78%) Scrum
11 4 (6.78%) Software Testing
Programming Languages
1 44 (74.58%) Java
2 11 (18.64%) TypeScript
3 7 (11.86%) Scala
4 5 (8.47%) C#
4 5 (8.47%) Java 8
4 5 (8.47%) JavaScript
5 3 (5.08%) Apple Swift
6 2 (3.39%) Python
6 2 (3.39%) Ruby
7 1 (1.69%) C
7 1 (1.69%) C++
7 1 (1.69%) Go
7 1 (1.69%) SQL
Qualifications
1 2 (3.39%) Degree
2 1 (1.69%) Computer Science Degree
2 1 (1.69%) SC Cleared
2 1 (1.69%) Security Cleared
Quality Assurance & Compliance
1 2 (3.39%) QA
System Software
1 2 (3.39%) Docker
Systems Management
1 2 (3.39%) Kubernetes
Vendors
1 3 (5.08%) Solace
2 2 (3.39%) Salesforce.com