The first table below looks at the demand 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 18 April 2014 with a comparison to the same period in the previous 2 years. The second table is for comparison and provides aggregates for all of the Operating Systems category for the City of London region.

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
18 Apr 2014
Same period 2013 Same period 2012
CentOS Linux
Rank 198 186 214
Rank change year-on-year
-12 +28
Contract jobs citing CentOS 12 11 10
As % of all contract IT jobs located in the City of London 0.19% 0.18% 0.12%
As % of the Operating Systems category 0.94% 0.86% 0.65%
Number of daily rates quoted 5 10 3
Average daily rate £306 £330 £400
Average daily rate % change year-on-year
-7.27% -17.50%
90% offered a daily rate of more than £210 £120 £272
10% offered a daily rate of more than £438 £500 £420
UK excluding London average daily rate £363 £300 £450
% change year-on-year
+20.83% -33.33%
Number of hourly rates quoted 0 0 0
Average hourly rate - - -
UK excluding London average hourly rate £35.00 £34.00 -
% change year-on-year
+2.94% -
Operating Systems Category
City of London
Contract IT job ads with a match in the
Operating Systems category
1273 1280 1532
As % of all contract IT jobs located in the City of London 19.72% 20.54% 18.94%
Number of daily rates quoted 908 872 1006
Average daily rate £400 £401 £400
Average daily rate % change year-on-year
-0.12% +0.12%
90% offered a daily rate of more than £185 £225 £225
10% offered a daily rate of more than £600 £550 £550
UK excluding London average daily rate £320 £315 £325
% change year-on-year
+1.58% -3.07%
Number of hourly rates quoted 52 74 92
Average hourly rate £17.50 £22.00 £20.00
Average hourly rate % change year-on-year
-20.45% +10.00%
90% offered a hourly rate of more than £12.30 £12.50 £12.50
10% offered a hourly rate of more than £26.75 £135.00 £37.00
UK excluding London average hourly rate £16.00 £16.00 £17.00
% change year-on-year
- -5.88%
CentOS
London

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 18 April 2014.

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 18 April 2014, 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 33 (91.67%) Linux
2 27 (75.00%) Red Hat
3 19 (52.78%) Ruby
3 19 (52.78%) Red Hat Enterprise Linux
4 18 (50.00%) Puppet
5 16 (44.44%) Python
5 16 (44.44%) Apache
6 15 (41.67%) Bash Shell
6 15 (41.67%) Opscode Chef
7 14 (38.89%) UNIX
8 11 (30.56%) Java
9 10 (27.78%) VMware
10 9 (25.00%) VMware Infrastructure
10 9 (25.00%) Perl
10 9 (25.00%) PHP
11 8 (22.22%) Oracle
11 8 (22.22%) Web Services
11 8 (22.22%) Ubuntu
11 8 (22.22%) Jenkins
11 8 (22.22%) Amazon AWS
12 7 (19.44%) vCloud
12 7 (19.44%) Xen
12 7 (19.44%) Finance
12 7 (19.44%) MySQL
12 7 (19.44%) Nagios
12 7 (19.44%) HTTP
12 7 (19.44%) DNS
12 7 (19.44%) Citrix
13 6 (16.67%) Oracle Database 10g
13 6 (16.67%) Windows

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

For the 6 months to 18 April 2014, 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 16 (44.44%) Apache
2 4 (11.11%) IIS
2 4 (11.11%) Tomcat
3 3 (8.33%) nginx
4 2 (5.56%) OpenStack
5 1 (2.78%) Drupal
5 1 (2.78%) WebLogic
5 1 (2.78%) Apache Solr
Applications
1 1 (2.78%) MS Visio
Business Applications
1 1 (2.78%) Oracle 11i
Cloud Services
1 8 (22.22%) Amazon AWS
2 6 (16.67%) Cloud Computing
3 2 (5.56%) Amazon EC2
3 2 (5.56%) Rackspace Cloud
3 2 (5.56%) GitHub
4 1 (2.78%) Amazon ELB
Communications & Networking
1 7 (19.44%) HTTP
1 7 (19.44%) DNS
2 4 (11.11%) SMTP
2 4 (11.11%) Firewall
3 3 (8.33%) IPsec
3 3 (8.33%) Network Security
3 3 (8.33%) PPTP
3 3 (8.33%) VPN
4 2 (5.56%) TCP/IP
4 2 (5.56%) Internet
4 2 (5.56%) LDAP
4 2 (5.56%) SSH
5 1 (2.78%) BIG-IP
5 1 (2.78%) OpenLDAP
5 1 (2.78%) iSCSI
5 1 (2.78%) VoIP
5 1 (2.78%) SNMP
5 1 (2.78%) SSL
5 1 (2.78%) SAN
Database & Business Intelligence
1 7 (19.44%) MySQL
2 6 (16.67%) Oracle Database 10g
2 6 (16.67%) Oracle Database
2 6 (16.67%) MongoDB
3 5 (13.89%) Oracle Database 11g
4 3 (8.33%) SQL Server
5 2 (5.56%) CouchDB
5 2 (5.56%) Apache Cassandra
6 1 (2.78%) Oracle8/8i Database
6 1 (2.78%) Oracle9i Database
6 1 (2.78%) Oracle Reports
Development Applications
1 8 (22.22%) Jenkins
2 4 (11.11%) Git (software)
3 3 (8.33%) Subversion
4 2 (5.56%) Maven
5 1 (2.78%) Hudson
General
1 7 (19.44%) Finance
2 2 (5.56%) Games
3 1 (2.78%) Manufacturing
3 1 (2.78%) Advertising
3 1 (2.78%) Publishing
3 1 (2.78%) Telecoms
3 1 (2.78%) Banking
3 1 (2.78%) Retail
Job Titles
1 14 (38.89%) Linux Engineer
2 11 (30.56%) DevOps Engineer
3 9 (25.00%) Systems Engineer
4 7 (19.44%) Administrator
5 6 (16.67%) Systems Administrator
6 5 (13.89%) Linux Systems Administrator
6 5 (13.89%) Linux Administrator
7 4 (11.11%) Support Engineer
7 4 (11.11%) Graduate
8 3 (8.33%) UNIX Systems Administrator
8 3 (8.33%) UNIX Administrator
9 2 (5.56%) Senior Linux Engineer
10 1 (2.78%) Systems Support Engineer
10 1 (2.78%) Process Manager
10 1 (2.78%) Analyst
10 1 (2.78%) Systems Analyst
10 1 (2.78%) Systems Support
10 1 (2.78%) Cloud Engineer
10 1 (2.78%) Platform Engineer
Libraries, Frameworks & Software Standards
1 8 (22.22%) Web Services
2 6 (16.67%) LAMP
3 5 (13.89%) XML
4 3 (8.33%) HTML
5 2 (5.56%) SOAP
6 1 (2.78%) JSF
6 1 (2.78%) Hibernate
6 1 (2.78%) EJB 3.0
6 1 (2.78%) Software Packaging
6 1 (2.78%) Apache Axis
6 1 (2.78%) JSON
6 1 (2.78%) UDDI
6 1 (2.78%) J2EE
6 1 (2.78%) EJB
6 1 (2.78%) JDBC
6 1 (2.78%) JSP
6 1 (2.78%) Servlets
6 1 (2.78%) RichFaces
6 1 (2.78%) REST
Miscellaneous
1 3 (8.33%) Computer Science
1 3 (8.33%) Open Source
2 2 (5.56%) Online Games
2 2 (5.56%) Replication
3 1 (2.78%) Clustering
3 1 (2.78%) Wiki
Operating Systems
1 33 (91.67%) Linux
2 19 (52.78%) Red Hat Enterprise Linux
3 14 (38.89%) UNIX
4 8 (22.22%) Ubuntu
5 6 (16.67%) Windows
5 6 (16.67%) Debian
6 5 (13.89%) Oracle Linux
6 5 (13.89%) Fedora
6 5 (13.89%) SUSE
7 3 (8.33%) Windows Server 2008
7 3 (8.33%) Windows 7
8 2 (5.56%) Solaris
9 1 (2.78%) HPUX
Processes & Methodologies
1 5 (13.89%) Continuous Integration
2 3 (8.33%) Migration
2 3 (8.33%) Load Balancing
2 3 (8.33%) E-Commerce
2 3 (8.33%) Configuration Management
3 2 (5.56%) Continuous Improvement
3 2 (5.56%) High Availability
3 2 (5.56%) Performance Tuning
3 2 (5.56%) Low Latency
3 2 (5.56%) ERD
3 2 (5.56%) Enterprise Architecture
3 2 (5.56%) Data Security
3 2 (5.56%) Workflow
4 1 (2.78%) Validation
4 1 (2.78%) GAP Analysis
4 1 (2.78%) Process Management
4 1 (2.78%) TDD
4 1 (2.78%) Project Planning
4 1 (2.78%) Statistical Analysis
4 1 (2.78%) Software Engineering
Programming Languages
1 19 (52.78%) Ruby
2 16 (44.44%) Python
3 15 (41.67%) Bash Shell
4 11 (30.56%) Java
5 9 (25.00%) Perl
5 9 (25.00%) PHP
6 5 (13.89%) sed
6 5 (13.89%) AWK
6 5 (13.89%) Shell Script
7 1 (2.78%) JavaScript
7 1 (2.78%) PL/SQL
7 1 (2.78%) SQL
Qualifications
1 3 (8.33%) Degree
2 1 (2.78%) SC Cleared
2 1 (2.78%) Security Cleared
2 1 (2.78%) CCNA
2 1 (2.78%) Cisco Certification
Quality Assurance & Compliance
1 2 (5.56%) QA
2 1 (2.78%) SLA
System Software
1 9 (25.00%) VMware Infrastructure
2 7 (19.44%) vCloud
2 7 (19.44%) Xen
3 6 (16.67%) KVM
4 5 (13.89%) VMware ESXi
4 5 (13.89%) XenServer
4 5 (13.89%) VMware ESX
4 5 (13.89%) Oracle RAC
5 3 (8.33%) NFS
6 2 (5.56%) Postfix
6 2 (5.56%) Sendmail
7 1 (2.78%) Samba
7 1 (2.78%) Active Directory
7 1 (2.78%) Hyper-V
7 1 (2.78%) Varnish
7 1 (2.78%) SpamAssassin
7 1 (2.78%) Apache Flume
Systems Management
1 18 (50.00%) Puppet
2 15 (41.67%) Opscode Chef
3 7 (19.44%) Nagios
4 2 (5.56%) Ansible
4 2 (5.56%) HAProxy
4 2 (5.56%) ZABBIX
5 1 (2.78%) Zenoss
5 1 (2.78%) Vagrant
5 1 (2.78%) StatsD
Vendors
1 27 (75.00%) Red Hat
2 10 (27.78%) VMware
3 8 (22.22%) Oracle
4 7 (19.44%) Citrix
5 3 (8.33%) New Relic
5 3 (8.33%) Splunk
6 2 (5.56%) Rackspace
6 2 (5.56%) NetApp
7 1 (2.78%) JBoss
7 1 (2.78%) Cisco
7 1 (2.78%) Sun
7 1 (2.78%) HP
7 1 (2.78%) BEA
7 1 (2.78%) F5
7 1 (2.78%) Tealeaf