The table below looks at the statistics for CentOS skills in IT contracts advertised for the City of London region. Included is a guide to the average contractor rates offered in IT contracts that have cited CentOS over the 3 months to 30 March 2015 with a comparison to the same period in the previous 2 years.

Note that daily contractor rates and hourly contractor rates are treated separately. When calculating average contractor rates, daily rates are not derived from quoted hourly rates or vice versa.

Location
3 months to
30 Mar 2015
Same period 2014 Same period 2013
CentOS Linux
Rank 185 196 179
Rank change year-on-year
+11 -17
Contract jobs citing CentOS 6 15 13
As % of all contract IT jobs located in the City of London 0.12% 0.24% 0.22%
As % of the Operating Systems category 0.53% 1.23% 1.09%
Number of daily rates quoted 5 5 10
Average daily rate
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of your Daily Rate
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£450 £306 £360
Average daily rate % change year-on-year
+47.05% -15.00%
90% offered a daily rate of more than £293 £210 £120
10% offered a daily rate of more than £535 £438 £500
UK excluding London average daily rate £375 £375 £300
% change year-on-year
- +25.00%
Number of hourly rates quoted 0 0 0
Average hourly rate - - -
UK excluding London average hourly rate £47.50 £35.00 £34.00
% change year-on-year
+35.71% +2.94%
CentOS
London

The following table is for comparison with the above and provides statistics for the entire Operating Systems category in contract jobs advertised in the City of London region.

Operating Systems Category
City of London
Contract IT job ads with a match in the
Operating Systems category
1127 1221 1194
As % of all contract IT jobs located in the City of London 21.73% 19.89% 20.33%
Number of daily rates quoted 870 840 805
Average daily rate £413 £402 £400
Average daily rate % change year-on-year
+2.61% +0.50%
90% offered a daily rate of more than £190 £189 £213
10% offered a daily rate of more than £575 £600 £550
UK excluding London average daily rate £340 £320 £309
% change year-on-year
+6.25% +3.55%
Number of hourly rates quoted 33 51 71
Average hourly rate £17.87 £18.70 £19.00
Average hourly rate % change year-on-year
-4.46% -1.57%
90% offered a hourly rate of more than £13.08 £13.40 £12.50
10% offered a hourly rate of more than £105.00 £27.50 £135.00
UK excluding London average hourly rate £15.00 £16.00 £16.00
% change year-on-year
-6.25% -

CentOS
Jobs Demand Trend in the City of London

This chart provides a 3-month moving total of IT contractor jobs citing CentOS across the City of London region as a proportion of the total demand within the Operating Systems category.

CentOS Jobs Demand Trend in the City of London

CentOS
Daily Rate Trend in the City of London

This chart provides the 3-month moving average for daily rates quoted in IT contract jobs citing CentOS across the City of London region.

CentOS Daily Rate Trend in the City of London

CentOS
Daily Rate Histogram in the City of London

This chart provides a histogram of daily rates quoted in contract IT jobs citing CentOS across the City of London region over the 3 months to 30 March 2015.

CentOS Daily Rate Histogram in the City of London

CentOS
Hourly Rate Trend in the City of London

This chart provides the 3-month moving average for hourly rates quoted in IT contractor jobs citing CentOS across the City of London region.

CentOS Hourly Rate Trend in the City of London

CentOS
Top 30 Related IT Skills in the City of London

For the 6 months to 30 March 2015, IT contractor jobs across the City of London region citing CentOS also mentioned the following IT skills in order of popularity. The figures indicate the number of jobs and their proportion against the total number of contract IT job ads sampled that cited CentOS.

1 24 (82.76%) Linux
2 19 (65.52%) Jenkins
3 17 (58.62%) Puppet
4 15 (51.72%) Git (software)
4 15 (51.72%) Agile Software Development
5 14 (48.28%) Red Hat
5 14 (48.28%) DevOps
6 13 (44.83%) Ubuntu
6 13 (44.83%) Red Hat Enterprise Linux
7 12 (41.38%) Ruby
7 12 (41.38%) Continuous Integration
7 12 (41.38%) VMware
7 12 (41.38%) Java
8 11 (37.93%) MySQL
8 11 (37.93%) Configuration Management
8 11 (37.93%) Maven
9 10 (34.48%) Bash Shell
10 9 (31.03%) Perl
10 9 (31.03%) Python
10 9 (31.03%) DNS
11 7 (24.14%) Apache
11 7 (24.14%) JavaScript
11 7 (24.14%) VMware Infrastructure
11 7 (24.14%) Cobbler
12 6 (20.69%) HTML5
12 6 (20.69%) CSS
12 6 (20.69%) Web Services
12 6 (20.69%) HTML
12 6 (20.69%) Windows
13 5 (17.24%) Kanban

CentOS
Top Related IT Skills in the City of London by Category

For the 6 months to 30 March 2015, IT contractor jobs across the City of London region citing CentOS also mentioned the following IT skills grouped by category. The figures indicate the number of jobs and their proportion against the total number of contract IT job ads sampled that cited CentOS. Up to 20 skills are shown per category.

Application Platforms
1 7 (24.14%) Apache
2 3 (10.34%) IIS
2 3 (10.34%) OpenStack
3 2 (6.90%) nginx
3 2 (6.90%) Moodle
3 2 (6.90%) Tomcat
4 1 (3.45%) GlassFish
4 1 (3.45%) Jetty
4 1 (3.45%) Node.js
4 1 (3.45%) JBoss
4 1 (3.45%) Elasticsearch
Applications
1 1 (3.45%) Photoshop
1 1 (3.45%) MS Office
Cloud Services
1 3 (10.34%) Amazon AWS
2 1 (3.45%) SaaS
2 1 (3.45%) PaaS
2 1 (3.45%) Rackspace Cloud
2 1 (3.45%) Route 53
2 1 (3.45%) IaaS
2 1 (3.45%) Amazon ELB
2 1 (3.45%) Amazon EC2
2 1 (3.45%) Amazon S3
Communications & Networking
1 9 (31.03%) DNS
2 4 (13.79%) Wi-Fi
3 2 (6.90%) Internet
3 2 (6.90%) DVB
3 2 (6.90%) Firewall
3 2 (6.90%) DHCP
3 2 (6.90%) HTTP
4 1 (3.45%) SNMP
4 1 (3.45%) VPN
4 1 (3.45%) SSL
4 1 (3.45%) IPv6
4 1 (3.45%) SAN
4 1 (3.45%) LDAP
4 1 (3.45%) IPsec
4 1 (3.45%) IMAP
4 1 (3.45%) OpenLDAP
4 1 (3.45%) OpenVPN
Database & Business Intelligence
1 11 (37.93%) MySQL
2 4 (13.79%) SQL Server
3 3 (10.34%) PostgreSQL
3 3 (10.34%) MongoDB
3 3 (10.34%) NoSQL
4 2 (6.90%) Apache Cassandra
4 2 (6.90%) SQL Server 2012
5 1 (3.45%) Redis
5 1 (3.45%) SQL Server Reporting Services
5 1 (3.45%) SQL Server Integration Services
Development Applications
1 19 (65.52%) Jenkins
2 15 (51.72%) Git (software)
3 11 (37.93%) Maven
4 5 (17.24%) Subversion
5 4 (13.79%) Selenium
5 4 (13.79%) Grunt
6 3 (10.34%) SonarQube
6 3 (10.34%) webpack
7 1 (3.45%) Ant
7 1 (3.45%) Mercurial
7 1 (3.45%) Hudson
7 1 (3.45%) Gradle
General
1 2 (6.90%) Finance
1 2 (6.90%) Games
Job Titles
1 12 (41.38%) DevOps Engineer
2 7 (24.14%) Linux DevOps Engineer
3 6 (20.69%) Developer
4 4 (13.79%) Systems Engineer
4 4 (13.79%) Administrator
4 4 (13.79%) Linux Administrator
4 4 (13.79%) Linux Systems Engineer
5 2 (6.90%) Senior DevOps Engineer
5 2 (6.90%) DevOps Administrator
5 2 (6.90%) Moodle Developer
5 2 (6.90%) PHP Developer
5 2 (6.90%) Java Developer
6 1 (3.45%) Java Software Engineer
6 1 (3.45%) Server Engineer
6 1 (3.45%) Applications Architect
6 1 (3.45%) Linux Systems Administrator
6 1 (3.45%) Applications Developer
6 1 (3.45%) Infrastructure Analyst
6 1 (3.45%) Architect
6 1 (3.45%) Software Engineer
Libraries, Frameworks & Software Standards
1 6 (20.69%) CSS
1 6 (20.69%) Web Services
1 6 (20.69%) HTML
1 6 (20.69%) HTML5
2 5 (17.24%) REST
3 4 (13.79%) jQuery
3 4 (13.79%) Spring
3 4 (13.79%) LAMP
3 4 (13.79%) XHTML
3 4 (13.79%) Backbone.js
3 4 (13.79%) AngularJS
4 3 (10.34%) MCollective
4 3 (10.34%) Hibernate
4 3 (10.34%) JSON
4 3 (10.34%) JPA
5 2 (6.90%) Middleware
6 1 (3.45%) Ajax
6 1 (3.45%) Java EE
6 1 (3.45%) WebSockets
6 1 (3.45%) ActiveMQ
Miscellaneous
1 4 (13.79%) W3C
1 4 (13.79%) Open Source
2 3 (10.34%) Clustering
2 3 (10.34%) Client/Server
3 2 (6.90%) E-Learning
3 2 (6.90%) Interactive TV
3 2 (6.90%) Replication
3 2 (6.90%) Digital Media
3 2 (6.90%) Data Structures
4 1 (3.45%) Hybrid Cloud
4 1 (3.45%) Analytical Skills
Operating Systems
1 24 (82.76%) Linux
2 13 (44.83%) Ubuntu
2 13 (44.83%) Red Hat Enterprise Linux
3 6 (20.69%) Windows
4 4 (13.79%) Windows Server 2008
5 3 (10.34%) UNIX
5 3 (10.34%) VMS
6 2 (6.90%) Windows Server 2012
6 2 (6.90%) SUSE Linux Enterprise Server
7 1 (3.45%) Debian
Processes & Methodologies
1 15 (51.72%) Agile Software Development
2 14 (48.28%) DevOps
3 12 (41.38%) Continuous Integration
4 11 (37.93%) Configuration Management
5 5 (17.24%) Kanban
5 5 (17.24%) Load Balancing
6 4 (13.79%) Performance Testing
6 4 (13.79%) Performance Tuning
6 4 (13.79%) Performance Monitoring
6 4 (13.79%) Kalman Filter
6 4 (13.79%) OO
7 2 (6.90%) Change Management
7 2 (6.90%) ITIL
7 2 (6.90%) Web Development
7 2 (6.90%) Server Monitoring
8 1 (3.45%) Auto-Scaling
8 1 (3.45%) Continuous Delivery
8 1 (3.45%) Asset Management
8 1 (3.45%) Software Engineering
8 1 (3.45%) High Availability
Programming Languages
1 12 (41.38%) Java
1 12 (41.38%) Ruby
2 10 (34.48%) Bash Shell
3 9 (31.03%) Python
3 9 (31.03%) Perl
4 7 (24.14%) JavaScript
5 4 (13.79%) PHP
5 4 (13.79%) SQL
5 4 (13.79%) Shell Script
6 1 (3.45%) PHP5
Qualifications
1 1 (3.45%) DV Cleared
1 1 (3.45%) Security Cleared
Quality Assurance & Compliance
1 1 (3.45%) QA
1 1 (3.45%) PCI DSS
System Software
1 7 (24.14%) VMware Infrastructure
2 2 (6.90%) Hyper-V
2 2 (6.90%) vSphere
2 2 (6.90%) KVM
3 1 (3.45%) Docker
3 1 (3.45%) NFS
3 1 (3.45%) Active Directory
3 1 (3.45%) VMware ESXi
3 1 (3.45%) FreeRADIUS
3 1 (3.45%) vCloud
Systems Management
1 17 (58.62%) Puppet
2 7 (24.14%) Cobbler
3 5 (17.24%) Red Hat Spacewalk
4 4 (13.79%) Opscode Chef
4 4 (13.79%) Ansible
5 2 (6.90%) Nagios
5 2 (6.90%) ZABBIX
6 1 (3.45%) Cacti
6 1 (3.45%) Vagrant
Vendors
1 14 (48.28%) Red Hat
2 12 (41.38%) VMware
3 4 (13.79%) EMC
4 2 (6.90%) Microsoft
5 1 (3.45%) Cisco
5 1 (3.45%) IBM
5 1 (3.45%) Zend
5 1 (3.45%) Percona
5 1 (3.45%) Facebook
5 1 (3.45%) Twitter
5 1 (3.45%) Rackspace