Period
to 28 September 2020

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 28 September 2020 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
28 Sep 2020
Same period 2019 Same period 2018
Rank 75 160 183
Rank change year-on-year +85 +23 +41
Contract jobs citing Kotlin 41 71 78
As % of all contract jobs advertised in the City of London 2.31% 1.16% 1.12%
As % of the Programming Languages category 4.77% 2.34% 2.08%
Number of daily rates quoted 46 66 72
Median daily rate £565 £575 £600
Median daily rate % change year-on-year -1.70% -4.17% -2.04%
10th Percentile £463 £431 £475
90th Percentile £688 £738 £775
Central London median daily rate £565 £575 £600
% change year-on-year -1.70% -4.17% -2.04%
Number of hourly rates quoted 0 0 0
Median hourly rate - - -
Central London median hourly rate - - -

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 860 3,035 3,750
As % of all contract IT jobs advertised in the City of London 48.37% 49.47% 53.75%
Number of daily rates quoted 625 2,470 3,138
Median daily rate £525 £525 £525
10th Percentile £363 £400 £375
90th Percentile £689 £675 £688
Central London median daily rate £525 £525 £525
Number of hourly rates quoted 10 14 13
Median hourly rate £35.00 £22.42 £22.00
Median hourly rate % change year-on-year +56.15% +1.89% +2.33%
10th Percentile £21.08 £21.00 £12.65
90th Percentile £41.65 £54.23 £58.44
Median hourly rate £35.00 £22.50 £22.00
% change year-on-year +55.56% +2.27% +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 28 September 2020.

Daily rate histogram for Kotlin in the City of London

For the 6 months to 28 September 2020, 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 31 (75.61%) Java
2 18 (43.90%) Agile Software Development
3 13 (31.71%) TDD
3 13 (31.71%) RESTful
4 12 (29.27%) Android
4 12 (29.27%) Android Development
5 10 (24.39%) React
5 10 (24.39%) MongoDB
5 10 (24.39%) Spring
5 10 (24.39%) Front Office
5 10 (24.39%) Finance
5 10 (24.39%) C#
6 9 (21.95%) .NET
6 9 (21.95%) .NET Core
6 9 (21.95%) ASP.NET Web API
6 9 (21.95%) Microservices
7 8 (19.51%) RxJava
8 7 (17.07%) Fintech
8 7 (17.07%) AWS
9 6 (14.63%) Scala
10 5 (12.20%) Azure
10 5 (12.20%) Test Automation
10 5 (12.20%) MVVM
10 5 (12.20%) Web Development
10 5 (12.20%) Continuous Integration
10 5 (12.20%) Banking
10 5 (12.20%) HTTPS
10 5 (12.20%) Redux
10 5 (12.20%) Continuous Delivery
10 5 (12.20%) Greenfield Project

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:

Application Platforms
1 4 (9.76%) Apache Spark
2 2 (4.88%) Confluence
Cloud Services
1 7 (17.07%) AWS
2 5 (12.20%) Azure
2 5 (12.20%) GCP
3 4 (9.76%) GitHub
4 1 (2.44%) Cloud Computing
4 1 (2.44%) SaaS
4 1 (2.44%) Serverless
Communications & Networking
1 5 (12.20%) HTTPS
2 3 (7.32%) SSL
3 1 (2.44%) Bluetooth
Database & Business Intelligence
1 10 (24.39%) MongoDB
2 4 (9.76%) NoSQL
3 1 (2.44%) Big Data
3 1 (2.44%) Hazelcast
3 1 (2.44%) PostgreSQL
Development Applications
1 3 (7.32%) Git (software)
1 3 (7.32%) JUnit
2 2 (4.88%) JIRA
2 2 (4.88%) Mockito
3 1 (2.44%) Android Studio
3 1 (2.44%) git-flow
3 1 (2.44%) GitLab
General
1 10 (24.39%) Finance
1 10 (24.39%) Front Office
2 5 (12.20%) Banking
3 4 (9.76%) Games
Job Titles
1 36 (87.80%) Developer
2 10 (24.39%) C# Developer
2 10 (24.39%) Full Stack Developer
2 10 (24.39%) React Developer
3 9 (21.95%) .NET Developer
3 9 (21.95%) Android Developer
3 9 (21.95%) C# .NET Developer
4 7 (17.07%) Java Developer
5 4 (9.76%) Applications Developer
6 3 (7.32%) Android Engineer
7 2 (4.88%) AWS Developer
7 2 (4.88%) Lead Android Developer
7 2 (4.88%) Lead Developer
8 1 (2.44%) Chief Technology Officer
8 1 (2.44%) Java Software Engineer
8 1 (2.44%) JavaScript Developer
8 1 (2.44%) Scala Developer
8 1 (2.44%) Senior C# Developer
8 1 (2.44%) Senior Developer
8 1 (2.44%) Senior Full Stack Developer
Libraries, Frameworks & Software Standards
1 13 (31.71%) RESTful
2 10 (24.39%) React
2 10 (24.39%) Spring
3 9 (21.95%) .NET
3 9 (21.95%) .NET Core
3 9 (21.95%) ASP.NET Web API
4 8 (19.51%) RxJava
5 5 (12.20%) Redux
5 5 (12.20%) REST
6 4 (9.76%) GraphQL
6 4 (9.76%) Kafka
6 4 (9.76%) Reactive Extensions
7 3 (7.32%) Guice
7 3 (7.32%) JAAS
7 3 (7.32%) Spring Security
8 2 (4.88%) CSS
8 2 (4.88%) HTML
8 2 (4.88%) Material Design
8 2 (4.88%) Retrofit
8 2 (4.88%) Spring Boot
Miscellaneous
1 5 (12.20%) Greenfield Project
2 2 (4.88%) Mobile App
2 2 (4.88%) User Experience
3 1 (2.44%) Algorithms
3 1 (2.44%) Analytical Skills
3 1 (2.44%) Data Structures
3 1 (2.44%) Foreign Exchange (FX)
3 1 (2.44%) Mobile Payment
Operating Systems
1 12 (29.27%) Android
2 1 (2.44%) Android TV
Processes & Methodologies
1 18 (43.90%) Agile Software Development
2 13 (31.71%) TDD
3 12 (29.27%) Android Development
4 9 (21.95%) Microservices
5 7 (17.07%) Fintech
6 5 (12.20%) Continuous Delivery
6 5 (12.20%) Continuous Integration
6 5 (12.20%) MVVM
6 5 (12.20%) Test Automation
6 5 (12.20%) Web Development
7 4 (9.76%) Computer Science
7 4 (9.76%) Digital Banking
7 4 (9.76%) Mobile Development
7 4 (9.76%) SDLC
7 4 (9.76%) Software Engineering
8 3 (7.32%) AOP
8 3 (7.32%) Dependency Injection
8 3 (7.32%) Mathematics
8 3 (7.32%) Pair Programming
9 2 (4.88%) Project Management
Programming Languages
1 31 (75.61%) Java
2 10 (24.39%) C#
3 6 (14.63%) Scala
4 4 (9.76%) JavaScript
4 4 (9.76%) SQL
5 3 (7.32%) Java 8
6 2 (4.88%) TypeScript
7 1 (2.44%) Bash Shell
7 1 (2.44%) C
7 1 (2.44%) Python
Qualifications
1 2 (4.88%) Degree
2 1 (2.44%) Computer Science Degree
System Software
1 5 (12.20%) Docker
Systems Management
1 4 (9.76%) Kubernetes
2 3 (7.32%) Prometheus
2 3 (7.32%) Zipkin
3 1 (2.44%) Terraform
Vendors
1 1 (2.44%) IBM
1 1 (2.44%) Salesforce.com