The following table provides summary statistics for permanent job vacancies advertised in the City of London with a requirement for CentOS skills. Included is a benchmarking guide to the salaries offered in vacancies that have cited CentOS over the 3 months to 26 March 2017 with a comparison to the same period in the previous 2 years.

3 months to
26 Mar 2017
Same period 2016 Same period 2015
CentOS Linux
London / City of London
Rank 182 244 268
Rank change year-on-year +62 +24  
Permanent jobs citing CentOS 44 29 47
As % of all permanent IT jobs advertised in the City of London 0.88% 0.41% 0.46%
As % of the Operating Systems category 3.43% 1.70% 1.72%
Number of salaries quoted 43 29 40
Median salary £55,000 £67,500 £52,500
Median salary % change year-on-year -18.51% +28.57%  
90% offered a salary of more than £38,300 £47,500 £32,500
10% offered a salary of more than £100,000 £85,500 £70,000
UK excluding London median salary £45,000 £45,000 £42,500
% change year-on-year - +5.88%  

CentOS is in the operating system skills category. The next table is for comparison with the above and provides summary statistics for all permanent job vacancies advertised in the City of London with a requirement for operating system skills.

Operating System Skills
City of London
Permanent job vacancies with a requirement for operating system skills 1284 1709 2738
As % of all permanent IT job vacancies advertised in the City of London 25.65% 24.08% 26.70%
Number of salaries quoted 1172 1527 2376
Median salary £55,000 £52,500 £48,500
Median salary % change year-on-year +4.76% +8.24%  
90% offered a salary of more than £28,500 £30,000 £30,000
10% offered a salary of more than £82,500 £70,000 £80,000
UK excluding London median salary £37,500 £37,500 £37,500

CentOS
Job Vacancy Trend in the City of London

The job posting trend of jobs advertised in the City of London citing CentOS as a proportion of all permanent or contract IT jobs with a match in the Operating Systems category.

Job vacancy trend for CentOS in the City of London

CentOS
Salary Trend in the City of London

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

Salary trend for CentOS in the City of London

CentOS
Salary Histogram in the City of London

The salary distribution of IT jobs citing CentOS in the City of London over the 3 months to 26 March 2017.

Salary histogram for CentOS in the City of London

CentOS
Top 30 Related IT Skills in the City of London

For the 6 months to 26 March 2017, IT jobs citing CentOS 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 City of London region with a requirement for CentOS.

1 74 (100.00%) Linux
2 51 (68.92%) Red Hat
3 39 (52.70%) Python
4 37 (50.00%) Windows
4 37 (50.00%) DevOps
5 33 (44.59%) Red Hat Enterprise Linux
6 31 (41.89%) Puppet
7 26 (35.14%) Ubuntu
8 25 (33.78%) Ansible
9 23 (31.08%) Java
9 23 (31.08%) Finance
10 21 (28.38%) Opscode Chef
10 21 (28.38%) Firewall
10 21 (28.38%) Configuration Management
11 20 (27.03%) Apache
11 20 (27.03%) Jenkins
12 19 (25.68%) Tomcat
12 19 (25.68%) Bash Shell
13 17 (22.97%) Windows Server
14 16 (21.62%) Docker
14 16 (21.62%) Ruby
14 16 (21.62%) Cisco Certification
15 15 (20.27%) Unix
16 14 (18.92%) SQL
16 14 (18.92%) Microsoft
16 14 (18.92%) Continuous Integration
16 14 (18.92%) Windows Server 2012
17 13 (17.57%) Cisco
17 13 (17.57%) MySQL
17 13 (17.57%) VMware

CentOS
Top Related 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 20 (27.03%) Apache
2 19 (25.68%) Tomcat
3 11 (14.86%) OpenStack
4 9 (12.16%) Apache Spark
5 7 (9.46%) Confluence
6 5 (6.76%) JBoss
7 3 (4.05%) nginx
8 2 (2.70%) IIS
8 2 (2.70%) WebSphere
9 1 (1.35%) Alfresco
9 1 (1.35%) Cloud Foundry
9 1 (1.35%) CloudStack
9 1 (1.35%) Elasticsearch
9 1 (1.35%) Exchange Server 2013
9 1 (1.35%) Jetty
9 1 (1.35%) Mongrel
9 1 (1.35%) MS Exchange
Applications
1 5 (6.76%) MS Excel
Cloud Services
1 12 (16.22%) Amazon AWS
2 3 (4.05%) Amazon EC2
2 3 (4.05%) Microsoft Azure
3 2 (2.70%) DigitalOcean
3 2 (2.70%) IaaS
3 2 (2.70%) PaaS
3 2 (2.70%) SaaS
4 1 (1.35%) Amazon ELB
4 1 (1.35%) Amazon S3
4 1 (1.35%) AWS CloudFormation
4 1 (1.35%) G Suite
4 1 (1.35%) Heroku
4 1 (1.35%) Linode
4 1 (1.35%) VULTR
Communications & Networking
1 21 (28.38%) Firewall
2 12 (16.22%) Network Security
3 11 (14.86%) VPN
4 6 (8.11%) TCP/IP
5 5 (6.76%) Cisco ISE
5 5 (6.76%) LAN
5 5 (6.76%) WAN
5 5 (6.76%) Wireless
6 4 (5.41%) Cisco ASA
6 4 (5.41%) iSCSI
6 4 (5.41%) NetScaler
6 4 (5.41%) SAN
7 3 (4.05%) Cisco Wireless
7 3 (4.05%) Fibre Channel
7 3 (4.05%) Internet
7 3 (4.05%) Intrusion Detection
7 3 (4.05%) OSPF
7 3 (4.05%) Spanning Tree
7 3 (4.05%) VLAN
8 2 (2.70%) BGP
Database & Business Intelligence
1 13 (17.57%) MySQL
2 9 (12.16%) Hadoop
3 8 (10.81%) Big Data
4 6 (8.11%) MongoDB
4 6 (8.11%) NoSQL
5 4 (5.41%) Data Warehouse
6 3 (4.05%) PostgreSQL
6 3 (4.05%) SQL Server
7 2 (2.70%) Apache Cassandra
7 2 (2.70%) Redis
7 2 (2.70%) SQL Server 2008
7 2 (2.70%) SQL Server 2012
8 1 (1.35%) Amazon RDS
8 1 (1.35%) Amazon Redshift
8 1 (1.35%) Data Mining
8 1 (1.35%) Oracle Database
8 1 (1.35%) Oracle Database 11g
Development Applications
1 20 (27.03%) Jenkins
2 9 (12.16%) Git (software)
3 8 (10.81%) JIRA
4 7 (9.46%) FishEye
5 6 (8.11%) Subversion
6 5 (6.76%) Vagrant
7 3 (4.05%) CruiseControl
7 3 (4.05%) Maven
8 1 (1.35%) Bitbucket
8 1 (1.35%) Cucumber
8 1 (1.35%) GoCD
8 1 (1.35%) Hudson
8 1 (1.35%) JUnit
8 1 (1.35%) Octopus Deploy
8 1 (1.35%) Travis CI
General
1 23 (31.08%) Finance
2 8 (10.81%) Front Office
3 3 (4.05%) Banking
4 2 (2.70%) Back Office
5 1 (1.35%) Games
5 1 (1.35%) Pharmaceutical
Job Titles
1 22 (29.73%) DevOps Engineer
2 16 (21.62%) Linux Engineer
3 10 (13.51%) Linux/Unix DevOps
4 9 (12.16%) Administrator
5 8 (10.81%) Support Engineer
6 7 (9.46%) Senior DevOps
6 7 (9.46%) Senior DevOps Engineer
6 7 (9.46%) Systems Administrator
7 6 (8.11%) Analyst
7 6 (8.11%) Linux Administrator
7 6 (8.11%) Security Engineer
7 6 (8.11%) Site Engineer
8 5 (6.76%) Architect
8 5 (6.76%) DevOps Architect
8 5 (6.76%) Linux DevOps Engineer
8 5 (6.76%) Linux Support
8 5 (6.76%) Network Engineer
9 4 (5.41%) Linux Support Engineer
9 4 (5.41%) Linux Systems Administrator
9 4 (5.41%) Senior Support Engineer
Libraries, Frameworks & Software Standards
1 5 (6.76%) FIX Protocol
1 5 (6.76%) Web Services
2 3 (4.05%) LAMP
2 3 (4.05%) Sensu
3 2 (2.70%) Boost C++ Libraries
3 2 (2.70%) CSS
3 2 (2.70%) HTML
3 2 (2.70%) HTML5
4 1 (1.35%) CGI
4 1 (1.35%) Elastic Stack
4 1 (1.35%) LEMP Stack
4 1 (1.35%) Node.js
4 1 (1.35%) RabbitMQ
4 1 (1.35%) REST
4 1 (1.35%) RESTful
4 1 (1.35%) Servlets
Miscellaneous
1 12 (16.22%) Data Centre
2 11 (14.86%) Linux Command Line
3 10 (13.51%) Computer Science
4 8 (10.81%) Hedge funds
5 7 (9.46%) Fintech
6 5 (6.76%) PKI
7 2 (2.70%) Management Information System
8 1 (1.35%) Analytical Skills
8 1 (1.35%) Animation
8 1 (1.35%) Digital Media
8 1 (1.35%) Driving Licence
8 1 (1.35%) EMC VNX
8 1 (1.35%) Private Cloud
8 1 (1.35%) Replication
Operating Systems
1 74 (100.00%) Linux
2 37 (50.00%) Windows
3 33 (44.59%) Red Hat Enterprise Linux
4 26 (35.14%) Ubuntu
5 17 (22.97%) Windows Server
6 15 (20.27%) Unix
7 14 (18.92%) Windows Server 2012
8 12 (16.22%) Windows Server 2008
9 5 (6.76%) Debian
10 3 (4.05%) Windows 7
11 2 (2.70%) Fedora
11 2 (2.70%) Windows 10
11 2 (2.70%) Windows 8
12 1 (1.35%) Kali Linux
12 1 (1.35%) Mac OS X
12 1 (1.35%) NetWare
12 1 (1.35%) Solaris
12 1 (1.35%) SUSE
12 1 (1.35%) Windows Server 2003
Processes & Methodologies
1 37 (50.00%) DevOps
2 21 (28.38%) Configuration Management
3 14 (18.92%) Continuous Integration
4 11 (14.86%) Continuous Deployment
5 10 (13.51%) Open Source
6 9 (12.16%) Visualisation
7 7 (9.46%) Systematic Trading
8 6 (8.11%) Analytics
8 6 (8.11%) Service Design
8 6 (8.11%) SIEM
9 5 (6.76%) Release Management
9 5 (6.76%) Vulnerability Management
10 4 (5.41%) Agile Software Development
10 4 (5.41%) E-Commerce
10 4 (5.41%) Information Security
10 4 (5.41%) Load Balancing
10 4 (5.41%) Network Monitoring
10 4 (5.41%) Performance Monitoring
11 3 (4.05%) Data Analysis
11 3 (4.05%) Incident Management
Programming Languages
1 39 (52.70%) Python
2 23 (31.08%) Java
3 19 (25.68%) Bash Shell
4 16 (21.62%) Ruby
5 14 (18.92%) SQL
6 11 (14.86%) Perl
7 10 (13.51%) PHP
8 9 (12.16%) PowerShell
9 7 (9.46%) Shell Script
10 5 (6.76%) JavaScript
11 4 (5.41%) C++
12 3 (4.05%) Go
12 3 (4.05%) PL/SQL
13 2 (2.70%) AWK
13 2 (2.70%) C
13 2 (2.70%) PHP 5
13 2 (2.70%) T-SQL
Qualifications
1 16 (21.62%) Cisco Certification
2 10 (13.51%) CCNP
2 10 (13.51%) Degree
3 8 (10.81%) CCSP
4 6 (8.11%) CCNA
5 5 (6.76%) CCDP
5 5 (6.76%) CESG Certified Professional
6 4 (5.41%) RHCA
6 4 (5.41%) RHCE
6 4 (5.41%) VMware Certified Professional (VCP)
7 3 (4.05%) (ISC)2 CCSP
7 3 (4.05%) CISM
7 3 (4.05%) CISSP
7 3 (4.05%) JNCIA
7 3 (4.05%) JNCIS
7 3 (4.05%) Linux+ Certification
7 3 (4.05%) LPIC
7 3 (4.05%) Microsoft Certification
7 3 (4.05%) RHCSA
8 2 (2.70%) MCTS
Quality Assurance & Compliance
1 5 (6.76%) ISO/IEC 27001
1 5 (6.76%) PCI DSS
2 1 (1.35%) QA
System Software
1 16 (21.62%) Docker
2 12 (16.22%) VMware Infrastructure
3 7 (9.46%) Active Directory
4 5 (6.76%) Snort
5 4 (5.41%) Virtual Machines
6 3 (4.05%) VMware ESXi
7 2 (2.70%) Virtual Servers
8 1 (1.35%) Hyper-V
8 1 (1.35%) KVM
8 1 (1.35%) Microsoft Virtual Server
8 1 (1.35%) pfSense
8 1 (1.35%) Shibboleth
8 1 (1.35%) vSphere
8 1 (1.35%) Xen
8 1 (1.35%) XenApp
8 1 (1.35%) XenServer
Systems Management
1 31 (41.89%) Puppet
2 25 (33.78%) Ansible
3 21 (28.38%) Opscode Chef
4 11 (14.86%) Kubernetes
5 10 (13.51%) Terraform
6 6 (8.11%) Mesos
6 6 (8.11%) Oracle ZFS
7 5 (6.76%) OSSEC
8 4 (5.41%) logstash
8 4 (5.41%) Nagios
9 3 (4.05%) CFEngine
9 3 (4.05%) FortiGate
9 3 (4.05%) Graphite
9 3 (4.05%) SCCM
10 2 (2.70%) Cisco CUCM
10 2 (2.70%) SELinux
11 1 (1.35%) EMC VPLEX
11 1 (1.35%) Kibana
11 1 (1.35%) Marathon
11 1 (1.35%) Simpana
Vendors
1 51 (68.92%) Red Hat
2 14 (18.92%) Microsoft
3 13 (17.57%) Cisco
3 13 (17.57%) VMware
4 10 (13.51%) Juniper
5 6 (8.11%) Atlassian
6 5 (6.76%) CheckPoint
6 5 (6.76%) Fortinet
6 5 (6.76%) HP
6 5 (6.76%) Intel Security
6 5 (6.76%) LogRhythm
6 5 (6.76%) Oracle
6 5 (6.76%) SonicWALL
6 5 (6.76%) Sourcefire
7 3 (4.05%) Aruba
7 3 (4.05%) Extreme Networks
7 3 (4.05%) F5
7 3 (4.05%) Palo Alto
7 3 (4.05%) WatchGuard
8 2 (2.70%) Aerohive Networks
City, London
Harrington Starr
Salary: £70000 - £90000 per annum
Posted: Yesterday
City, London
Oliver Bernard
Salary: £90000 - £110000 per annum + Benefits
Posted: 3 days ago
City, London
Premier IT
Salary: £45000.00 - £55000.00 per annum
Posted: 4 days ago
City, London
Reflex Computer Recruitment Ltd
Salary: Bonuses + Benefits
Posted: 2 days ago
City, London
Evolution Recruitment Solutions
Salary: 35,000 - 45,000
Posted: 3 days ago
City, London
Empiric Solutions
Posted: 5 days ago
City, London
Empiric Solutions
Salary: Benefits
Posted: 5 days ago
City of London
Venturi
Salary: £50000 - £60000 per annum + 12% bonus & benefits
Posted: 11 days ago
City of London
Michael Page Technology
Salary: £75000 - £85000 per annum
Posted: 6 days ago
City, London
Digital Gurus
Salary: £40000 - £60000 Per Annum £40,000 - £60,000
Posted: 25 days ago