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 contractor rates offered in IT contracts that have cited CentOS over the 3 months to 19 January 2017 with a comparison to the same period over 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.

3 months to
19 Jan 2017
Same period 2016 Same period 2015
CentOS Linux
London / City of London
Rank 137 134 171
Rank change year-on-year
-3 +37
Contract jobs citing CentOS 18 13 20
As % of all contract IT jobs located in the City of London 0.61% 0.43% 0.39%
As % of the Operating Systems category 2.77% 2.01% 1.73%
Number of daily rates quoted 15 12 14
Median daily rate £438 £445 £425
Median daily rate % change year-on-year
-1.57% +4.58%
90% offered a daily rate of more than £385 £347 £308
10% offered a daily rate of more than £530 £498 £535
UK excluding London median daily rate £450 £450 £350
% change year-on-year
- +28.57%
Number of hourly rates quoted 0 0 0
Median hourly rate - - -
UK excluding London median hourly rate - £50.50 £47.50
% change year-on-year
- +6.31%

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
649 646 1154
As % of all contract IT jobs located in the City of London 22.14% 21.16% 22.50%
Number of daily rates quoted 529 480 867
Median daily rate £450 £436 £410
Median daily rate % change year-on-year
+3.15% +6.40%
90% offered a daily rate of more than £282 £202 £215
10% offered a daily rate of more than £600 £575 £575
UK excluding London median daily rate £350 £350 £330
% change year-on-year
- +6.06%
Number of hourly rates quoted 7 20 46
Median hourly rate £21.75 £20.25 £17.25
Median hourly rate % change year-on-year
+7.40% +17.39%
90% offered a hourly rate of more than £13.30 £12.65 £12.00
10% offered a hourly rate of more than £130.30 £30.00 £105.00
UK excluding London median hourly rate £16.50 £17.00 £16.00
% change year-on-year
-2.94% +6.25%

CentOS
Jobs Demand Trend in the City of London

The demand trend of contract jobs across the City of London region citing CentOS as a proportion of all IT contracts with a match in 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 19 January 2017.

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 19 January 2017, IT contractor jobs citing CentOS also mentioned the following skills in order of popularity. The figures indicate the number co-occurrences and its proportion to all contract ads across the City of London region with a requirement for CentOS.

1 45 (100.00%) Linux
2 25 (55.56%) Python
3 21 (46.67%) Red Hat
4 20 (44.44%) Apache
4 20 (44.44%) DevOps
5 19 (42.22%) Red Hat Enterprise Linux
6 18 (40.00%) Ansible
6 18 (40.00%) Docker
7 17 (37.78%) Amazon AWS
7 17 (37.78%) VMware
8 16 (35.56%) Puppet
9 15 (33.33%) Continuous Integration
10 14 (31.11%) Bash Shell
10 14 (31.11%) Agile Software Development
11 13 (28.89%) Configuration Management
11 13 (28.89%) Jenkins
12 12 (26.67%) Windows
13 11 (24.44%) Java
13 11 (24.44%) Ruby
13 11 (24.44%) Git (software)
13 11 (24.44%) VMware Infrastructure
14 10 (22.22%) Hadoop
14 10 (22.22%) PostgreSQL
14 10 (22.22%) Finance
15 9 (20.00%) Firewall
15 9 (20.00%) Ubuntu
15 9 (20.00%) MySQL
15 9 (20.00%) IIS
15 9 (20.00%) Unix
15 9 (20.00%) JIRA

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 (44.44%) Apache
2 9 (20.00%) IIS
3 7 (15.56%) Apache Spark
4 6 (13.33%) Confluence
4 6 (13.33%) Tomcat
5 5 (11.11%) OpenStack
6 3 (6.67%) CMS
6 3 (6.67%) Elasticsearch
6 3 (6.67%) Exchange Server 2010
6 3 (6.67%) MS Exchange
6 3 (6.67%) Mule ESB
6 3 (6.67%) nginx
7 2 (4.44%) JBoss
8 1 (2.22%) ColdFusion
8 1 (2.22%) Jetty
8 1 (2.22%) WebLogic
8 1 (2.22%) WildFly
Applications
1 1 (2.22%) HipChat
Cloud Services
1 17 (37.78%) Amazon AWS
2 3 (6.67%) Amazon EC2
3 2 (4.44%) Cloud Computing
3 2 (4.44%) GitHub
3 2 (4.44%) Google Cloud Platform
3 2 (4.44%) Microsoft Azure
4 1 (2.22%) Amazon S3
4 1 (2.22%) AWS Elastic Beanstalk
4 1 (2.22%) AWS Lambda
4 1 (2.22%) G Suite
Communications & Networking
1 9 (20.00%) Firewall
2 7 (15.56%) DNS
3 6 (13.33%) SSL
3 6 (13.33%) TCP/IP
3 6 (13.33%) VPN
4 3 (6.67%) HTTP
4 3 (6.67%) Reverse Proxy
5 2 (4.44%) DMZ
5 2 (4.44%) Internet
5 2 (4.44%) OpenVPN
5 2 (4.44%) SAN
5 2 (4.44%) SSH
6 1 (2.22%) Cisco Nexus
6 1 (2.22%) iSCSI
6 1 (2.22%) LAN
6 1 (2.22%) LDAP
6 1 (2.22%) OpenLDAP
6 1 (2.22%) SNMP
6 1 (2.22%) WAN
6 1 (2.22%) Wireshark
Database & Business Intelligence
1 10 (22.22%) Hadoop
1 10 (22.22%) PostgreSQL
2 9 (20.00%) MongoDB
2 9 (20.00%) MySQL
3 8 (17.78%) NoSQL
4 4 (8.89%) Apache Hive
4 4 (8.89%) Big Data
4 4 (8.89%) SQL Server
5 2 (4.44%) Ingres
5 2 (4.44%) InterSystems Cache
5 2 (4.44%) Redis
6 1 (2.22%) MariaDB
6 1 (2.22%) Relational Database
Development Applications
1 13 (28.89%) Jenkins
2 11 (24.44%) Git (software)
3 9 (20.00%) JIRA
4 5 (11.11%) FishEye
5 4 (8.89%) Atlassian Bamboo
5 4 (8.89%) Sonatype Nexus
6 3 (6.67%) Gerrit
6 3 (6.67%) Maven
6 3 (6.67%) Mercurial
6 3 (6.67%) SonarQube
7 2 (4.44%) Artifactory
7 2 (4.44%) Team Foundation Server
7 2 (4.44%) TeamCity
8 1 (2.22%) Ant
8 1 (2.22%) Bitbucket
8 1 (2.22%) GoCD
8 1 (2.22%) JIRA Agile
8 1 (2.22%) JUnit
8 1 (2.22%) Subversion
8 1 (2.22%) Visual Studio
General
1 10 (22.22%) Finance
2 4 (8.89%) Front Office
2 4 (8.89%) Legal
3 1 (2.22%) Games
3 1 (2.22%) Law
3 1 (2.22%) Telecoms
Job Titles
1 13 (28.89%) DevOps Engineer
2 10 (22.22%) Linux Engineer
3 8 (17.78%) Developer
4 7 (15.56%) Linux/Unix DevOps
5 6 (13.33%) AWS DevOps
5 6 (13.33%) Linux DevOps Engineer
6 4 (8.89%) AWS Engineer
6 4 (8.89%) Hadoop Engineer
6 4 (8.89%) Unix Engineer
7 3 (6.67%) Administrator
7 3 (6.67%) Consultant
7 3 (6.67%) Continuous Deployment Engineer
7 3 (6.67%) Linux Systems Engineer
7 3 (6.67%) Systems Administrator
7 3 (6.67%) Systems Engineer
8 2 (4.44%) C# Developer
8 2 (4.44%) C++ Developer
8 2 (4.44%) Infrastructure Engineer
8 2 (4.44%) Migration Engineer
8 2 (4.44%) Perl Developer
Libraries, Frameworks & Software Standards
1 8 (17.78%) Web Services
2 7 (15.56%) Middleware
3 6 (13.33%) HTML
4 5 (11.11%) JSON
4 5 (11.11%) LAMP
5 4 (8.89%) CSS
5 4 (8.89%) LAPP Stack
5 4 (8.89%) XML
6 3 (6.67%) jQuery
6 3 (6.67%) LEMP Stack
6 3 (6.67%) RabbitMQ
6 3 (6.67%) RSS
6 3 (6.67%) XSLT
7 2 (4.44%) .NET
7 2 (4.44%) ASP.NET
7 2 (4.44%) J2EE
7 2 (4.44%) Kafka
7 2 (4.44%) LINQ
7 2 (4.44%) REST
7 2 (4.44%) Software Packaging
Miscellaneous
1 9 (20.00%) Analytical Skills
2 7 (15.56%) Computer Science
3 6 (13.33%) Clustering
3 6 (13.33%) Data Centre
4 5 (11.11%) Visualisation
5 4 (8.89%) Hedge funds
5 4 (8.89%) Public Cloud
6 3 (6.67%) Web 2.0
7 2 (4.44%) Data Integration
7 2 (4.44%) HP StoreVirtual
8 1 (2.22%) Management Information System
8 1 (2.22%) Mathematics
8 1 (2.22%) Physics
8 1 (2.22%) Private Cloud
8 1 (2.22%) RIA
8 1 (2.22%) User Experience
Operating Systems
1 45 (100.00%) Linux
2 19 (42.22%) Red Hat Enterprise Linux
3 12 (26.67%) Windows
4 9 (20.00%) Ubuntu
4 9 (20.00%) Unix
5 6 (13.33%) Windows Server
6 1 (2.22%) Amazon Linux
6 1 (2.22%) Android
6 1 (2.22%) Apple iOS
6 1 (2.22%) Debian
6 1 (2.22%) FreeBSD
6 1 (2.22%) Mac OS X
6 1 (2.22%) Mac OS X Server
6 1 (2.22%) Solaris
6 1 (2.22%) Windows Server 2008
6 1 (2.22%) Windows Server 2012
Processes & Methodologies
1 20 (44.44%) DevOps
2 15 (33.33%) Continuous Integration
3 14 (31.11%) Agile Software Development
4 13 (28.89%) Configuration Management
5 7 (15.56%) Continuous Deployment
5 7 (15.56%) Migration
6 6 (13.33%) Load Balancing
6 6 (13.33%) Open Source
6 6 (13.33%) Scrum
7 5 (11.11%) Continuous Delivery
7 5 (11.11%) Data Centre Operations
7 5 (11.11%) High Availability
7 5 (11.11%) Service Design
8 4 (8.89%) OOP
8 4 (8.89%) Project Management
8 4 (8.89%) Systematic Trading
9 3 (6.67%) E-Commerce
9 3 (6.67%) Mentoring
9 3 (6.67%) Service Management
10 2 (4.44%) Procedural Programming
Programming Languages
1 25 (55.56%) Python
2 14 (31.11%) Bash Shell
3 11 (24.44%) Java
3 11 (24.44%) Ruby
4 8 (17.78%) Perl
5 7 (15.56%) PHP
6 5 (11.11%) C
6 5 (11.11%) PowerShell
7 4 (8.89%) JavaScript
8 3 (6.67%) Shell Script
9 2 (4.44%) C#
9 2 (4.44%) C++
9 2 (4.44%) Go
9 2 (4.44%) R
9 2 (4.44%) Scala
10 1 (2.22%) SQL
Qualifications
1 7 (15.56%) Degree
2 5 (11.11%) SC Cleared
2 5 (11.11%) Security Cleared
3 2 (4.44%) RHCE
3 2 (4.44%) RHCSA
4 1 (2.22%) CTC Cleared
Quality Assurance & Compliance
1 5 (11.11%) PCI DSS
2 2 (4.44%) QA
System Software
1 18 (40.00%) Docker
2 11 (24.44%) VMware Infrastructure
3 7 (15.56%) Active Directory
4 4 (8.89%) DFS Replication
4 4 (8.89%) Virtual Machines
5 2 (4.44%) vCloud
6 1 (2.22%) NFS
6 1 (2.22%) Postfix
6 1 (2.22%) Squid
6 1 (2.22%) VirtualBox
6 1 (2.22%) VMware ESXi
6 1 (2.22%) Xen
6 1 (2.22%) XenServer
Systems Management
1 18 (40.00%) Ansible
2 16 (35.56%) Puppet
3 8 (17.78%) Opscode Chef
4 7 (15.56%) Terraform
5 6 (13.33%) Kubernetes
6 5 (11.11%) Oracle ZFS
7 4 (8.89%) Kibana
7 4 (8.89%) logstash
7 4 (8.89%) Microsoft Clustering
7 4 (8.89%) ZABBIX
8 3 (6.67%) HAProxy
8 3 (6.67%) HP Data Protector
9 2 (4.44%) Rancher
9 2 (4.44%) Rundeck
9 2 (4.44%) Salt
10 1 (2.22%) Casper Suite
10 1 (2.22%) Consul
10 1 (2.22%) Grafana
10 1 (2.22%) Nagios
10 1 (2.22%) Symantec Endpoint Protection
Vendors
1 21 (46.67%) Red Hat
2 17 (37.78%) VMware
3 7 (15.56%) Atlassian
4 5 (11.11%) HP
5 4 (8.89%) Symantec
6 3 (6.67%) Barracuda Networks
6 3 (6.67%) Cisco
6 3 (6.67%) Google
6 3 (6.67%) Microsoft
6 3 (6.67%) Sonatype
7 2 (4.44%) Black Duck
7 2 (4.44%) Citrix
7 2 (4.44%) Cloudera
7 2 (4.44%) Juniper
7 2 (4.44%) OpenText
7 2 (4.44%) Oracle
7 2 (4.44%) RedDot
7 2 (4.44%) Veracode
8 1 (2.22%) SaltStack
8 1 (2.22%) Splunk