The following table provides summary statistics for permanent job vacancies advertised in London with a requirement for Log4j skills. Included is a benchmarking guide to the salaries offered in vacancies that have cited Log4j over the 3 months to 28 March 2017 with a comparison to the same period in the previous 2 years.

Apache Log4j
England / London
3 months to
28 Mar 2017
Same period 2016 Same period 2015
Rank 573 644 633
Rank change year-on-year +71 -11  
Permanent jobs citing Log4j 4 11 30
As % of all permanent IT jobs advertised in London 0.012% 0.026% 0.070%
As % of the Development Applications category 0.060% 0.14% 0.43%
Number of salaries quoted 4 7 27
Median salary £36,000 £40,000 £55,000
Median salary % change year-on-year -10.00% -27.27%  
UK excluding London median salary - £70,000 £55,000
% change year-on-year - +27.27%  

Log4j is in the development application skills category. The next table is for comparison with the above and provides summary statistics for all permanent job vacancies advertised in London with a requirement for development application skills.

Development Application Skills
London
Permanent job vacancies with a requirement for development application skills 6659 7984 6920
As % of all permanent IT job vacancies advertised in London 19.74% 18.93% 16.13%
Number of salaries quoted 5629 6924 5731
Median salary £60,000 £55,000 £53,000
Median salary % change year-on-year +9.09% +3.77%  
90% offered a salary of more than £40,000 £40,000 £38,000
10% offered a salary of more than £80,000 £70,000 £77,500
UK excluding London median salary £42,500 £42,500 £41,000
% change year-on-year - +3.65%  

Log4j
Job Vacancy Trend in London

The job posting trend of jobs advertised in London citing Log4j as a proportion of all permanent or contract IT jobs with a match in the Development Applications category.

Job vacancy trend for Log4j in London

Log4j
Salary Trend in London

This chart provides the 3-month moving average for salaries quoted in permanent IT jobs citing Log4j in London.

Salary trend for Log4j in London

Log4j
Salary Histogram in London

The salary distribution of IT jobs citing Log4j in London over the 3 months to 28 March 2017.

Salary histogram for Log4j in London

For the 6 months to 28 March 2017, IT jobs citing Log4j also mentioned the following skills in order of popularity. The figures indicate the number co-occurrences and its proportion to all job ads across the London region with a requirement for Log4j.

1 10 (100.00%) Java
2 9 (90.00%) Oracle
3 8 (80.00%) SQL
4 7 (70.00%) SQL Server
4 7 (70.00%) Web Services
4 7 (70.00%) Tomcat
4 7 (70.00%) HTML
5 6 (60.00%) XML
5 6 (60.00%) CSS
5 6 (60.00%) JDBC
5 6 (60.00%) JSP
5 6 (60.00%) JavaScript
5 6 (60.00%) Maven
5 6 (60.00%) Ajax
6 5 (50.00%) JSF
6 5 (50.00%) Hibernate
6 5 (50.00%) J2EE
6 5 (50.00%) Servlets
6 5 (50.00%) Eclipse
6 5 (50.00%) RDBMS
6 5 (50.00%) Relational Database
7 4 (40.00%) IBM
7 4 (40.00%) JMS
7 4 (40.00%) Windows
7 4 (40.00%) Linux
7 4 (40.00%) WebLogic
7 4 (40.00%) Finance
7 4 (40.00%) Banking
7 4 (40.00%) Continuous Integration
8 3 (30.00%) Apache Axis

Log4j
Co-occurring IT Skills in 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 7 (70.00%) Tomcat
2 4 (40.00%) WebLogic
3 3 (30.00%) Apache
4 2 (20.00%) Adobe Experience Manager
5 1 (10.00%) JBoss
5 1 (10.00%) WebLogic Portal
5 1 (10.00%) WebSphere
Applications
1 2 (20.00%) MS Excel
1 2 (20.00%) MS Office
Cloud Services
1 1 (10.00%) Amazon AWS
Communications & Networking
1 2 (20.00%) SMTP
2 1 (10.00%) HTTP
2 1 (10.00%) LDAP
Database & Business Intelligence
1 7 (70.00%) SQL Server
2 5 (50.00%) RDBMS
2 5 (50.00%) Relational Database
3 3 (30.00%) Data Warehouse
3 3 (30.00%) Hazelcast
3 3 (30.00%) MySQL
3 3 (30.00%) Oracle Database
3 3 (30.00%) Oracle Database 10g
3 3 (30.00%) Oracle Database 11g
3 3 (30.00%) SSDT
4 1 (10.00%) Apache Cassandra
4 1 (10.00%) Big Data
4 1 (10.00%) DB2
4 1 (10.00%) Jackrabbit
4 1 (10.00%) MongoDB
Development Applications
1 6 (60.00%) Maven
2 5 (50.00%) Eclipse
3 3 (30.00%) Ant
3 3 (30.00%) MyEclipse
3 3 (30.00%) Subversion
4 2 (20.00%) JUnit
5 1 (10.00%) Atlassian Bamboo
5 1 (10.00%) Bitbucket
5 1 (10.00%) Fiddler
5 1 (10.00%) Gatling
5 1 (10.00%) Git (software)
5 1 (10.00%) Hudson
5 1 (10.00%) Jenkins
5 1 (10.00%) JIRA
5 1 (10.00%) JMeter
5 1 (10.00%) LoadRunner
5 1 (10.00%) LoadUI
5 1 (10.00%) Selenium
5 1 (10.00%) YourKit
General
1 4 (40.00%) Banking
1 4 (40.00%) Finance
2 3 (30.00%) Front Office
2 3 (30.00%) Investment Banking
3 1 (10.00%) Publishing
Job Titles
1 4 (40.00%) Developer
1 4 (40.00%) Java Developer
1 4 (40.00%) Senior Developer
1 4 (40.00%) Senior Java Developer
2 2 (20.00%) Development Manager
2 2 (20.00%) Java Development Manager
2 2 (20.00%) Java Programmer
2 2 (20.00%) Oracle Development Manager
2 2 (20.00%) Programmer
2 2 (20.00%) Risk Manager
3 1 (10.00%) Consultant
3 1 (10.00%) Development Team Leader
3 1 (10.00%) Java Team Leader
3 1 (10.00%) Oracle Team Leader
3 1 (10.00%) Software Team Leader
3 1 (10.00%) Team Leader
3 1 (10.00%) Technical Consultant
3 1 (10.00%) Technical Leader
3 1 (10.00%) Technical Manager
3 1 (10.00%) Test Engineer
Libraries, Frameworks & Software Standards
1 7 (70.00%) HTML
1 7 (70.00%) Web Services
2 6 (60.00%) Ajax
2 6 (60.00%) CSS
2 6 (60.00%) JDBC
2 6 (60.00%) JSP
2 6 (60.00%) XML
3 5 (50.00%) Hibernate
3 5 (50.00%) J2EE
3 5 (50.00%) JSF
3 5 (50.00%) Servlets
4 4 (40.00%) JMS
5 3 (30.00%) Apache Axis
5 3 (30.00%) AWT
5 3 (30.00%) JavaBeans
5 3 (30.00%) MDX
5 3 (30.00%) ODBC
5 3 (30.00%) Struts
5 3 (30.00%) Swing
5 3 (30.00%) XSLT
Miscellaneous
1 3 (30.00%) Client/Server
1 3 (30.00%) Computer Science
1 3 (30.00%) Credit Risk
2 2 (20.00%) Analytical Skills
2 2 (20.00%) OTC Derivatives
3 1 (10.00%) New Media
Operating Systems
1 4 (40.00%) Linux
1 4 (40.00%) Windows
2 3 (30.00%) Red Hat Enterprise Linux
2 3 (30.00%) Unix
3 1 (10.00%) Android
3 1 (10.00%) Apple iOS
Processes & Methodologies
1 4 (40.00%) Continuous Integration
2 3 (30.00%) Automated Testing
2 3 (30.00%) ETL
2 3 (30.00%) Migration
2 3 (30.00%) MVC
2 3 (30.00%) Risk Management
2 3 (30.00%) SDLC
2 3 (30.00%) Validation
3 2 (20.00%) TDD
3 2 (20.00%) UML
3 2 (20.00%) Use Case
3 2 (20.00%) Web Development
4 1 (10.00%) Agile Software Development
4 1 (10.00%) Asset Management
4 1 (10.00%) Continuous Delivery
4 1 (10.00%) Feature Driven Development
4 1 (10.00%) Mathematics
4 1 (10.00%) Performance Testing
4 1 (10.00%) Target Operating Model
4 1 (10.00%) Workflow
Programming Languages
1 10 (100.00%) Java
2 8 (80.00%) SQL
3 6 (60.00%) JavaScript
4 3 (30.00%) ANSI SQL
4 3 (30.00%) Data Analysis Expressions (DAX)
4 3 (30.00%) Perl
4 3 (30.00%) PL/SQL
5 2 (20.00%) ECMAScript
5 2 (20.00%) VBA
6 1 (10.00%) Bash Shell
6 1 (10.00%) Groovy
6 1 (10.00%) Scala
Qualifications
1 3 (30.00%) Degree
Quality Assurance & Compliance
1 1 (10.00%) QA
Systems Management
1 3 (30.00%) Control-M
2 1 (10.00%) Grafana
2 1 (10.00%) Graphite
2 1 (10.00%) HP SiteScope
2 1 (10.00%) Nagios
2 1 (10.00%) ZABBIX
Vendors
1 9 (90.00%) Oracle
2 4 (40.00%) IBM
3 3 (30.00%) Informatica
3 3 (30.00%) Red Hat
3 3 (30.00%) Sybase
4 2 (20.00%) Adobe
5 1 (10.00%) Cognizant
5 1 (10.00%) Dynatrace
5 1 (10.00%) HP
5 1 (10.00%) Misys
5 1 (10.00%) SOASTA, Inc