Period
to 9 December 2019

The following table provides summary statistics for contract job vacancies advertised in London with a requirement for CentOS skills. Included is a benchmarking guide to the contractor rates offered in vacancies that have cited CentOS over the 6 months to 9 December 2019 with a comparison to the same period in the previous 2 years.

Note that daily and hourly rates are treated separately in these statistics. When calculating contractor rate percentiles, daily rates are never derived from quoted hourly rates or vice versa.

CentOS Linux
England > London
6 months to
9 Dec 2019
Same period 2018 Same period 2017
Rank 413 399 345
Rank change year-on-year -14 -54 -99
Contract jobs citing CentOS 131 244 330
As % of all contract IT jobs advertised in London 0.38% 0.52% 0.70%
As % of the Operating Systems category 2.15% 2.64% 3.37%
Number of daily rates quoted 89 161 247
London median daily rate £525 £520 £500
Median daily rate % change year-on-year +0.96% +4.00% -
10th Percentile £373 £400 £330
90th Percentile £713 £625 £618
England median daily rate £500 £475 £458
% change year-on-year +5.26% +3.71% -0.97%
Number of hourly rates quoted 1 0 5
London median hourly rate £35.00 - £29.00
England median hourly rate £35.00 £44.58 £29.00
% change year-on-year -21.49% +53.72% +114.81%

CentOS is in the Operating Systems category. The following table is for comparison with the above and provides summary statistics for all contract job vacancies advertised in London with a requirement for operating system skills.

All Operating Systems
London
Contract vacancies with a requirement for operating system skills 6,084 9,242 9,792
As % of all contract IT jobs advertised in London 17.70% 19.82% 20.78%
Number of daily rates quoted 4,203 6,488 6,965
London median daily rate £450 £488 £475
Median daily rate % change year-on-year -7.69% +2.63% +5.56%
10th Percentile £159 £188 £200
90th Percentile £650 £650 £638
England median daily rate £420 £425 £425
% change year-on-year -1.18% - +3.03%
Number of hourly rates quoted 201 274 270
London median hourly rate £21.00 £18.70 £19.00
Median hourly rate % change year-on-year +12.30% -1.58% +5.56%
10th Percentile £13.88 £12.50 £12.00
90th Percentile £55.50 £47.28 £47.83
England median hourly rate £17.50 £17.50 £17.50

CentOS
Job Vacancy Trend in London

Job postings citing CentOS as a percentage of all IT jobs advertised in London.

Job vacancy trend for CentOS in London

CentOS
Contractor Daily Rate Trend in London

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

Contractor daily rate trend for CentOS in London

CentOS
Contractor Daily Rate Histogram in London

The daily rate distribution of IT jobs citing CentOS in London over the 6 months to 9 December 2019.

Contractor daily rate histogram for CentOS in London

CentOS
Contractor Hourly Rate Trend in London

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

Contractor hourly rate trend for CentOS in London

CentOS
Contract Job Locations in London

The table below looks at the demand and provides a guide to the median contractor rates quoted in IT jobs citing CentOS within the London region over the 6 months to 9 December 2019. The 'Rank Change' column provides an indication of the change in demand within each location based on the same 6 month period last year.

Location Rank Change
on Same Period
Last Year
Matching
Contract
IT Job Ads
Median
Daily Rate
Past 6 Months
Median Daily Rate
% Change
on Same Period
Last Year
Live
Job
Vacancies
Central London +31 18 £500 -4.76% 12
South London +6 15 £550 +18.92% 4
West London +18 6 £449 -8.83% 5
North London - 2 £450 - 1
East London - 1 - - 9
CentOS
England

For the 6 months to 9 December 2019, IT contractor jobs citing CentOS also mentioned the following skills in order of popularity. The figures indicate the absolute number co-occurrences and as a proportion of all contract job ads across the London region with a requirement for CentOS.

1 131 (100.00%) Linux
2 74 (56.49%) Red Hat Enterprise Linux
3 67 (51.15%) Python
4 61 (46.56%) DevOps
5 54 (41.22%) Bash Shell
6 53 (40.46%) Windows
6 53 (40.46%) Red Hat
7 51 (38.93%) Security Cleared
8 46 (35.11%) Jenkins
9 45 (34.35%) Ubuntu
10 44 (33.59%) Git (software)
11 42 (32.06%) Azure
12 38 (29.01%) AWS
13 37 (28.24%) Ansible
14 36 (27.48%) SC Cleared
14 36 (27.48%) Agile Software Development
15 35 (26.72%) VMware
16 33 (25.19%) Puppet
17 32 (24.43%) Docker
18 31 (23.66%) Continuous Integration
18 31 (23.66%) Microsoft
19 30 (22.90%) Java
19 30 (22.90%) Kubernetes
20 29 (22.14%) Terraform
20 29 (22.14%) MySQL
21 27 (20.61%) JIRA
22 26 (19.85%) Windows Server
23 25 (19.08%) Test Automation
23 25 (19.08%) Firewall
24 24 (18.32%) C++

CentOS
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 17 (12.98%) Tomcat
2 14 (10.69%) Confluence
3 12 (9.16%) Elasticsearch
4 11 (8.40%) nginx
5 10 (7.63%) Apache
6 8 (6.11%) OpenStack
7 7 (5.34%) JBoss
7 7 (5.34%) Jetty
8 6 (4.58%) Oracle Self-Service HR
8 6 (4.58%) WebLogic
9 5 (3.82%) Apache Spark
10 4 (3.05%) IIS
11 2 (1.53%) WebSphere
12 1 (0.76%) Mailman
12 1 (0.76%) Mongrel
12 1 (0.76%) Oracle SOA Suite
12 1 (0.76%) Skype for Business
Applications
1 5 (3.82%) Microsoft Office
2 4 (3.05%) Microsoft Excel
Business Applications
1 1 (0.76%) Sparx Enterprise Architect
Cloud Services
1 42 (32.06%) Azure
2 38 (29.01%) AWS
3 16 (12.21%) GCP
4 10 (7.63%) Office 365
5 6 (4.58%) GitHub
6 4 (3.05%) Amazon EKS
6 4 (3.05%) Google App Engine
6 4 (3.05%) PaaS
6 4 (3.05%) Sumo Logic
7 3 (2.29%) AWS CloudFormation
7 3 (2.29%) Azure Active Directory
7 3 (2.29%) Heroku
8 2 (1.53%) Amazon EC2
8 2 (1.53%) AWS Lambda
8 2 (1.53%) Cloud Computing
8 2 (1.53%) OpenShift
8 2 (1.53%) Serverless
8 2 (1.53%) Stackdriver
8 2 (1.53%) Virtual Private Cloud
9 1 (0.76%) Amazon CloudWatch
Communications & Networking
1 25 (19.08%) Firewall
2 14 (10.69%) VPN
3 13 (9.92%) DNS
4 11 (8.40%) SSH
4 11 (8.40%) TCP/IP
5 10 (7.63%) Network Security
6 7 (5.34%) DHCP
7 6 (4.58%) Cisco IOS
7 6 (4.58%) HTTP
7 6 (4.58%) WAN
8 4 (3.05%) Cisco Nexus
8 4 (3.05%) Intrusion Detection
8 4 (3.05%) Kerberos
8 4 (3.05%) LAN
8 4 (3.05%) Wi-Fi
9 3 (2.29%) Cisco ASA
9 3 (2.29%) NX-OS
9 3 (2.29%) SAN
9 3 (2.29%) Wireless
9 3 (2.29%) Wireshark
Database & Business Intelligence
1 29 (22.14%) MySQL
2 18 (13.74%) PostgreSQL
3 13 (9.92%) SQL Server
4 10 (7.63%) Hadoop
4 10 (7.63%) MongoDB
5 7 (5.34%) Big Data
5 7 (5.34%) Oracle Database
6 4 (3.05%) NoSQL
7 3 (2.29%) Aerospike
7 3 (2.29%) Apache Cassandra
7 3 (2.29%) Cloudera CDH
7 3 (2.29%) InfluxDB
7 3 (2.29%) Redis
7 3 (2.29%) SQL Server 2012
8 2 (1.53%) Amazon RDS
8 2 (1.53%) Data Warehouse
8 2 (1.53%) SQL Server 2008
8 2 (1.53%) SQL Server 2014
9 1 (0.76%) Oracle Database 10g
9 1 (0.76%) RDBMS
Development Applications
1 46 (35.11%) Jenkins
2 44 (33.59%) Git (software)
3 27 (20.61%) JIRA
4 17 (12.98%) Maven
4 17 (12.98%) Subversion
5 12 (9.16%) Mercurial
5 12 (9.16%) SonarQube
6 10 (7.63%) Vagrant
7 9 (6.87%) Sonatype Nexus
8 8 (6.11%) GitLab
9 7 (5.34%) Ant
9 7 (5.34%) Atlassian Bamboo
9 7 (5.34%) Cucumber
9 7 (5.34%) Gradle
9 7 (5.34%) Selenium
10 6 (4.58%) ClearCase
10 6 (4.58%) Eclipse
10 6 (4.58%) FindBugs
10 6 (4.58%) IntelliJ
10 6 (4.58%) Poseidon for UML
General
1 10 (7.63%) Public Sector
2 9 (6.87%) Finance
3 8 (6.11%) Banking
4 3 (2.29%) Back Office
5 2 (1.53%) Games
6 1 (0.76%) Automotive
6 1 (0.76%) Law
6 1 (0.76%) Police
6 1 (0.76%) Retail
6 1 (0.76%) Telecoms
Job Titles
1 32 (24.43%) DevOps Engineer
2 21 (16.03%) Linux Engineer
3 15 (11.45%) Linux/Unix DevOps
4 12 (9.16%) Administrator
4 12 (9.16%) Linux DevOps Engineer
5 11 (8.40%) Infrastructure Engineer
6 10 (7.63%) Software Engineer
7 9 (6.87%) Mac Engineer
8 8 (6.11%) AWS DevOps
8 8 (6.11%) AWS DevOps Engineer
8 8 (6.11%) AWS Engineer
8 8 (6.11%) DV Cleared Software Engineer
8 8 (6.11%) Security Engineer
8 8 (6.11%) Senior DevOps
8 8 (6.11%) Senior DevOps Engineer
9 7 (5.34%) Architect
9 7 (5.34%) Java Engineer
9 7 (5.34%) Network Engineer
9 7 (5.34%) Systems Administrator
10 6 (4.58%) Cloud Engineer
Libraries, Frameworks & Software Standards
1 20 (15.27%) RabbitMQ
2 15 (11.45%) XML
3 14 (10.69%) JSON
3 14 (10.69%) Node.js
4 12 (9.16%) .NET
4 12 (9.16%) Spring
5 11 (8.40%) REST
6 10 (7.63%) Elastic Stack
7 9 (6.87%) HTML
7 9 (6.87%) HTML5
8 7 (5.34%) ActiveMQ
8 7 (5.34%) Apache Camel
8 7 (5.34%) React
9 6 (4.58%) AngularJS
9 6 (4.58%) GWT
9 6 (4.58%) JMS
9 6 (4.58%) jQuery
9 6 (4.58%) LAMP
9 6 (4.58%) Play Framework
9 6 (4.58%) STL
Miscellaneous
1 10 (7.63%) Linux Command Line
2 8 (6.11%) User Experience
3 7 (5.34%) Analytical Skills
3 7 (5.34%) Public Cloud
4 6 (4.58%) Derivative
5 5 (3.82%) Clustering
5 5 (3.82%) Data Centre
6 4 (3.05%) Cloud Native
6 4 (3.05%) Hedge funds
7 3 (2.29%) Management Information System
7 3 (2.29%) Mobile App
8 2 (1.53%) Cyber Defence
8 2 (1.53%) Enterprise Storage
8 2 (1.53%) Equities
8 2 (1.53%) PKI
9 1 (0.76%) Algorithms
9 1 (0.76%) Blackberry
9 1 (0.76%) Greenfield Project
9 1 (0.76%) Online Games
9 1 (0.76%) Replication
Operating Systems
1 131 (100.00%) Linux
2 74 (56.49%) Red Hat Enterprise Linux
3 53 (40.46%) Windows
4 45 (34.35%) Ubuntu
5 26 (19.85%) Windows Server
6 17 (12.98%) Debian
7 15 (11.45%) Unix
8 12 (9.16%) Mac OS X
9 10 (7.63%) Apple iOS
10 9 (6.87%) Android
10 9 (6.87%) Windows Server 2012
11 8 (6.11%) Windows Server 2008
12 5 (3.82%) CoreOS
12 5 (3.82%) Mac OS
13 4 (3.05%) Mac OS X Server
14 3 (2.29%) DC/OS
14 3 (2.29%) Mesosphere
14 3 (2.29%) Oracle Linux
15 2 (1.53%) Fedora
15 2 (1.53%) Solaris
Processes & Methodologies
1 61 (46.56%) DevOps
2 36 (27.48%) Agile Software Development
3 31 (23.66%) Continuous Integration
4 25 (19.08%) Test Automation
5 24 (18.32%) ITIL
6 19 (14.50%) Configuration Management
7 16 (12.21%) Infrastructure Engineering
7 16 (12.21%) Scrum
8 14 (10.69%) Build Automation
9 13 (9.92%) Service Design
9 13 (9.92%) Software Engineering
10 12 (9.16%) Immutable Infrastructure
10 12 (9.16%) Kanban
11 11 (8.40%) Open Source
12 9 (6.87%) Infrastructure as Code
12 9 (6.87%) Infrastructure Automation
12 9 (6.87%) SIEM
12 9 (6.87%) System Testing
12 9 (6.87%) User Acceptance Testing
13 8 (6.11%) Project Delivery
Programming Languages
1 67 (51.15%) Python
2 54 (41.22%) Bash Shell
3 30 (22.90%) Java
4 24 (18.32%) C++
5 22 (16.79%) Perl
6 20 (15.27%) Groovy
7 16 (12.21%) Ruby
8 15 (11.45%) JavaScript
8 15 (11.45%) PowerShell
9 13 (9.92%) SQL
10 10 (7.63%) Go
10 10 (7.63%) Shell Script
11 9 (6.87%) Clojure
12 8 (6.11%) T-SQL
13 7 (5.34%) C#
13 7 (5.34%) PL/SQL
14 6 (4.58%) ClojureScript
14 6 (4.58%) Scala
15 5 (3.82%) PHP
16 4 (3.05%) VBA
Qualifications
1 51 (38.93%) Security Cleared
2 36 (27.48%) SC Cleared
3 15 (11.45%) DV Cleared
4 8 (6.11%) CCNA
4 8 (6.11%) Cisco Certification
5 7 (5.34%) CCENT
5 7 (5.34%) Network+ Certification
6 6 (4.58%) Microsoft Certification
7 3 (2.29%) Degree
8 2 (1.53%) CEH
8 2 (1.53%) CISSP
8 2 (1.53%) MCITP
8 2 (1.53%) MCP
8 2 (1.53%) MCSE
8 2 (1.53%) VMware Certified Professional (VCP)
9 1 (0.76%) Computer Science Degree
9 1 (0.76%) MCSA
Quality Assurance & Compliance
1 7 (5.34%) NIST
2 3 (2.29%) ISO/IEC 27001
2 3 (2.29%) PMO
2 3 (2.29%) QA
3 2 (1.53%) COBIT
3 2 (1.53%) PCI DSS
3 2 (1.53%) Sarbanes-Oxley
3 2 (1.53%) SLA
4 1 (0.76%) ISO/IEC 27002 (supersedes ISO/IEC 17799)
System Software
1 32 (24.43%) Docker
2 20 (15.27%) Active Directory
2 20 (15.27%) VMware Infrastructure
3 7 (5.34%) VMware NSX
4 6 (4.58%) Hyper-V
4 6 (4.58%) VMware ESXi
5 5 (3.82%) KVM
5 5 (3.82%) Virtual Machines
5 5 (3.82%) VirtualBox
6 4 (3.05%) pfSense
6 4 (3.05%) Virtual Servers
7 3 (2.29%) Oracle RAC
7 3 (2.29%) oVirt
8 2 (1.53%) OCFS2
8 2 (1.53%) Snort
8 2 (1.53%) Xen
9 1 (0.76%) iptables
9 1 (0.76%) NFS
9 1 (0.76%) Samba
9 1 (0.76%) vCloud
Systems Management
1 37 (28.24%) Ansible
2 33 (25.19%) Puppet
3 30 (22.90%) Kubernetes
4 29 (22.14%) Terraform
5 19 (14.50%) Opscode Chef
6 10 (7.63%) Nagios
7 9 (6.87%) Jamf Pro
7 9 (6.87%) Prometheus
7 9 (6.87%) Salt
8 8 (6.11%) Docker Swarm
8 8 (6.11%) vCenter Server
9 7 (5.34%) Packer
9 7 (5.34%) Symantec Endpoint Protection
10 6 (4.58%) logstash
10 6 (4.58%) Norton AntiVirus
10 6 (4.58%) ZABBIX
11 5 (3.82%) Consul
12 4 (3.05%) CFEngine
12 4 (3.05%) SELinux
12 4 (3.05%) WSUS
Vendors
1 53 (40.46%) Red Hat
2 35 (26.72%) VMware
3 31 (23.66%) Microsoft
4 15 (11.45%) Cisco
5 13 (9.92%) Oracle
6 12 (9.16%) Splunk
7 11 (8.40%) Cloudera
7 11 (8.40%) Google
8 9 (6.87%) Apple
8 9 (6.87%) Palo Alto
9 8 (6.11%) HP
9 8 (6.11%) Symantec
10 7 (5.34%) Atlassian
10 7 (5.34%) Citrix
10 7 (5.34%) Hortonworks
10 7 (5.34%) Remedy
10 7 (5.34%) SolarWinds
11 6 (4.58%) Juniper
11 6 (4.58%) Sybase
12 5 (3.82%) SaltStack