Period
to 29 July 2021

The following table provides summary statistics for contract job vacancies advertised in the City of London with a requirement for JSON skills. Included is a benchmarking guide to the contractor rates offered in vacancies that have cited JSON over the 6 months to 29 July 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.

JSON
Central London > City of London
6 months to
29 Jul 2021
Same period 2020 Same period 2019
Rank 124 120 99
Rank change year-on-year -4 -21 +6
Contract jobs citing JSON 39 18 160
As % of all contract jobs advertised in the City of London 1.14% 0.76% 2.44%
As % of the Libraries, Frameworks & Software Standards category 3.36% 2.27% 6.62%
Number of daily rates quoted 25 10 122
10th Percentile £370 £433 £425
25th Percentile £447 £463 £475
Median daily rate (50th Percentile) £525 £538 £525
Median % change year-on-year -2.33% +2.38% +5.00%
75th Percentile £638 £584 £588
90th Percentile £740 £650 £686
Central London median daily rate £509 £550 £525
% change year-on-year -7.55% +4.76% +5.00%
Number of hourly rates quoted 0 0 1
Median hourly rate - - £21.50
Central London median hourly rate - - £21.50

JSON 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 1,161 794 2,416
As % of all contract IT jobs advertised in the City of London 33.88% 33.64% 36.82%
Number of daily rates quoted 889 615 1,960
10th Percentile £410 £375 £413
25th Percentile £463 £450 £464
Median daily rate (50th Percentile) £585 £525 £525
Median % change year-on-year +11.43% - -
75th Percentile £650 £625 £600
90th Percentile £725 £688 £675
Central London median daily rate £575 £525 £525
% change year-on-year +9.52% - -
Number of hourly rates quoted 8 7 10
10th Percentile £15.88 £29.05 £20.15
25th Percentile £20.00 £34.75 £24.81
Median hourly rate £30.25 £39.00 £38.37
Median % change year-on-year -22.44% +1.64% +74.42%
75th Percentile £37.75 £52.63 £48.56
90th Percentile £47.43 £59.00 £56.50
Central London median hourly rate £35.00 £39.00 £41.75
% change year-on-year -10.26% -6.58% +89.75%

JSON
Job Vacancy Trend in the City of London

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

Job vacancy trend for JSON in the City of London

JSON
Contractor Daily Rate Trend in the City of London

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

Daily rate trend for JSON in the City of London

JSON
Daily Rate Histogram in the City of London

Daily rate distribution for jobs citing JSON in the City of London over the 6 months to 29 July 2021.

Daily rate histogram for JSON in the City of London

JSON
Contractor Hourly Rate Trend in the City of London

3-month moving average hourly rates quoted in jobs citing JSON in the City of London.

Hourly rate trend for JSON in the City of London

For the 6 months to 29 July 2021, IT contractor jobs citing JSON 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 JSON.

1 20 (51.28%) XML
2 18 (46.15%) Java
3 14 (35.90%) SQL
3 14 (35.90%) Agile Software Development
4 10 (25.64%) Spring
4 10 (25.64%) JavaScript
5 9 (23.08%) HTML
5 9 (23.08%) Git (software)
5 9 (23.08%) Azure
5 9 (23.08%) RESTful
5 9 (23.08%) REST
6 8 (20.51%) DevOps
6 8 (20.51%) Spring Boot
6 8 (20.51%) CSS
6 8 (20.51%) Web Services
6 8 (20.51%) Python
6 8 (20.51%) Finance
7 7 (17.95%) Microservices
7 7 (17.95%) Jenkins
7 7 (17.95%) Front End Development
8 6 (15.38%) Full Stack Development
8 6 (15.38%) User Experience
8 6 (15.38%) React
8 6 (15.38%) AWS
8 6 (15.38%) SQL Server
9 5 (12.82%) SOAP
9 5 (12.82%) Data Modelling
9 5 (12.82%) ETL
9 5 (12.82%) Maven
9 5 (12.82%) SQL Server Integration Services

JSON
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 3 (7.69%) Elasticsearch
2 2 (5.13%) Apache
2 2 (5.13%) Apache Spark
2 2 (5.13%) CMS
2 2 (5.13%) Confluence
3 1 (2.56%) JBoss
3 1 (2.56%) SharePoint
Applications
1 1 (2.56%) Microsoft Excel
1 1 (2.56%) Microsoft PowerPoint
Cloud Services
1 9 (23.08%) Azure
2 6 (15.38%) AWS
3 5 (12.82%) GitHub
4 4 (10.26%) Azure Data Factory
5 3 (7.69%) IaaS
6 2 (5.13%) GCP
6 2 (5.13%) Serverless
6 2 (5.13%) Slack
6 2 (5.13%) Snowflake
7 1 (2.56%) Amazon Cognito
7 1 (2.56%) Azure Functions
7 1 (2.56%) Azure Key Vault
7 1 (2.56%) Azure Logic Apps
7 1 (2.56%) Azure Service Bus
7 1 (2.56%) Azure Storage
7 1 (2.56%) Boomi
7 1 (2.56%) npm
7 1 (2.56%) Power Automate
7 1 (2.56%) Power Platform
7 1 (2.56%) PowerApps
Communications & Networking
1 4 (10.26%) HTTP
2 2 (5.13%) HTTPS
3 1 (2.56%) BGP
3 1 (2.56%) Cisco ASA
3 1 (2.56%) Cisco Nexus
3 1 (2.56%) Cisco Wireless
3 1 (2.56%) F5 BIG-IP GTM
3 1 (2.56%) F5 BIG-IP LTM
3 1 (2.56%) Firewall
3 1 (2.56%) Internet
3 1 (2.56%) LAN
3 1 (2.56%) Multicast
3 1 (2.56%) Network Security
3 1 (2.56%) OSPF
3 1 (2.56%) TCP/IP
3 1 (2.56%) VXLAN
3 1 (2.56%) WAN
3 1 (2.56%) Wi-Fi
3 1 (2.56%) Wireless
3 1 (2.56%) Wireshark
Database & Business Intelligence
1 6 (15.38%) SQL Server
2 5 (12.82%) SQL Server Integration Services
3 4 (10.26%) Data Warehouse
4 3 (7.69%) Hadoop
5 2 (5.13%) Apache Hive
5 2 (5.13%) Big Data
5 2 (5.13%) NoSQL
5 2 (5.13%) Tableau
6 1 (2.56%) Amazon DynamoDB
6 1 (2.56%) Amazon RDS
6 1 (2.56%) Amazon Redshift
6 1 (2.56%) Azure SQL Database
6 1 (2.56%) BusinessObjects
6 1 (2.56%) CouchDB
6 1 (2.56%) Data Mart
6 1 (2.56%) OLTP
6 1 (2.56%) Oracle Database
6 1 (2.56%) PostgreSQL
6 1 (2.56%) Relational Database
6 1 (2.56%) Yellowfin
Development Applications
1 9 (23.08%) Git (software)
2 7 (17.95%) Jenkins
3 5 (12.82%) Maven
4 4 (10.26%) JUnit
5 3 (7.69%) GitLab
5 3 (7.69%) Mockito
5 3 (7.69%) Sonatype Nexus
6 2 (5.13%) Android Studio
6 2 (5.13%) Calabash
6 2 (5.13%) Gradle
6 2 (5.13%) JIRA
6 2 (5.13%) Subversion
6 2 (5.13%) webpack
7 1 (2.56%) Ant
7 1 (2.56%) Karma Test Runner
7 1 (2.56%) Mocha
7 1 (2.56%) NetBeans
7 1 (2.56%) Visual Studio
7 1 (2.56%) Visual Studio Team System
7 1 (2.56%) Xcode
General
1 8 (20.51%) Finance
2 3 (7.69%) Banking
2 3 (7.69%) Social Skills
3 2 (5.13%) Analytical Skills
3 2 (5.13%) Public Sector
4 1 (2.56%) Advertising
4 1 (2.56%) Financial Institution
4 1 (2.56%) Front Office
4 1 (2.56%) Investment Banking
4 1 (2.56%) Manufacturing
Job Titles
1 21 (53.85%) Developer
2 4 (10.26%) Java Developer
3 3 (7.69%) Analyst
3 3 (7.69%) ETL Developer
3 3 (7.69%) Front End Developer (Client-Side Developer)
3 3 (7.69%) Full Stack Developer
3 3 (7.69%) Lead Developer
3 3 (7.69%) Technical Leader
4 2 (5.13%) Android Developer
4 2 (5.13%) Architect
4 2 (5.13%) Cloud Developer
4 2 (5.13%) Integration Analyst
4 2 (5.13%) iOS Developer
4 2 (5.13%) Technical Analyst
5 1 (2.56%) Data Modeller
5 1 (2.56%) Network Manager
5 1 (2.56%) Programme Manager
5 1 (2.56%) Software Engineer
5 1 (2.56%) SQL Developer
5 1 (2.56%) Team Leader
Libraries, Frameworks & Software Standards
1 20 (51.28%) XML
2 10 (25.64%) Spring
3 9 (23.08%) HTML
3 9 (23.08%) REST
3 9 (23.08%) RESTful
4 8 (20.51%) CSS
4 8 (20.51%) Spring Boot
4 8 (20.51%) Web Services
5 6 (15.38%) React
6 5 (12.82%) Node.js
6 5 (12.82%) SOAP
7 4 (10.26%) AngularJS
8 3 (7.69%) JMS
8 3 (7.69%) jQuery
8 3 (7.69%) Kafka
8 3 (7.69%) Redux
8 3 (7.69%) Sass
9 2 (5.13%) Ajax
9 2 (5.13%) JPA
9 2 (5.13%) Middleware
Miscellaneous
1 6 (15.38%) User Experience
2 1 (2.56%) Animation
2 1 (2.56%) Data Centre
2 1 (2.56%) Enterprise Software
2 1 (2.56%) Foreign Exchange (FX)
2 1 (2.56%) iPhone
2 1 (2.56%) Mobile App
2 1 (2.56%) Virtual Team
Operating Systems
1 4 (10.26%) Linux
2 3 (7.69%) Android
3 2 (5.13%) Apple iOS
3 2 (5.13%) Mac OS
3 2 (5.13%) Unix
4 1 (2.56%) Windows
Processes & Methodologies
1 14 (35.90%) Agile Software Development
2 8 (20.51%) DevOps
3 7 (17.95%) Front End Development
3 7 (17.95%) Microservices
4 6 (15.38%) Full Stack Development
5 5 (12.82%) Data Modelling
5 5 (12.82%) ETL
6 4 (10.26%) Business Intelligence
6 4 (10.26%) Dashboard Development
6 4 (10.26%) Data Governance
6 4 (10.26%) Data Mapping
6 4 (10.26%) Integration Testing
6 4 (10.26%) TDD
6 4 (10.26%) Test Automation
7 3 (7.69%) Continuous Integration
7 3 (7.69%) ETL Development
7 3 (7.69%) Master Data Management
7 3 (7.69%) Performance Tuning
7 3 (7.69%) Push Notifications
7 3 (7.69%) Root Cause Analysis
Programming Languages
1 18 (46.15%) Java
2 14 (35.90%) SQL
3 10 (25.64%) JavaScript
4 8 (20.51%) Python
5 4 (10.26%) C#
6 3 (7.69%) ES6
6 3 (7.69%) Kotlin
7 2 (5.13%) Apple Swift
7 2 (5.13%) Java 8
7 2 (5.13%) Objective-C
7 2 (5.13%) Scala
7 2 (5.13%) T-SQL
8 1 (2.56%) Ada
8 1 (2.56%) C++
8 1 (2.56%) PowerShell
8 1 (2.56%) TypeScript
8 1 (2.56%) VBA
Qualifications
1 4 (10.26%) SC Cleared
1 4 (10.26%) Security Cleared
2 1 (2.56%) AWS Certification
Quality Assurance & Compliance
1 1 (2.56%) QA
System Software
1 4 (10.26%) Docker
Systems Management
1 1 (2.56%) Ansible
1 1 (2.56%) Terraform
Vendors
1 3 (7.69%) Google
1 3 (7.69%) Oracle
2 2 (5.13%) CA
2 2 (5.13%) CA Agile Central
2 2 (5.13%) Confluent
3 1 (2.56%) Alteryx
3 1 (2.56%) Arista
3 1 (2.56%) CheckPoint
3 1 (2.56%) Cisco
3 1 (2.56%) F5
3 1 (2.56%) Fortinet
3 1 (2.56%) IBM
3 1 (2.56%) Informatica
3 1 (2.56%) Microsoft
3 1 (2.56%) Palo Alto
3 1 (2.56%) Riverbed
3 1 (2.56%) Salesforce.com
3 1 (2.56%) SAP
3 1 (2.56%) SolarWinds
3 1 (2.56%) Splunk