Period
to 19 November 2017

The following table provides summary statistics for contract job vacancies 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 19 November 2017 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
UK
6 months to
19 Nov 2017
Same period 2016 Same period 2015
Rank 401 319 447
Rank change year-on-year -82 +128 -43
Contract jobs citing CentOS 583 811 548
As % of all contract IT jobs advertised in the UK 0.57% 0.77% 0.48%
As % of the Operating Systems category 2.74% 3.59% 2.23%
Number of daily rates quoted 419 572 353
UK median daily rate £455 £463 £425
Median daily rate % change year-on-year -1.62% +8.82% +6.25%
10th Percentile £313 £313 £300
90th Percentile £588 £588 £550
UK excluding London median daily rate £420 £430 £378
% change year-on-year -2.33% +13.91% +0.67%
Number of hourly rates quoted 14 6 3
UK median hourly rate £32.88 £14.75 £38.00
Median hourly rate % change year-on-year +122.88% -61.18% +125.19%
10th Percentile £17.00 £11.69 £34.80
90th Percentile £48.75 £38.25 £48.20
UK excluding London median hourly rate £35.00 £13.50 £38.00
% change year-on-year +159.26% -64.47% +125.19%

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 with a requirement for operating system skills.

All Operating Systems
UK
Contract vacancies with a requirement for operating system skills 21272 22613 24585
As % of all contract IT jobs advertised in the UK 20.98% 21.57% 21.45%
Number of daily rates quoted 13519 14253 14509
UK median daily rate £425 £400 £393
Median daily rate % change year-on-year +6.25% +1.91% +4.67%
10th Percentile £170 £200 £187
90th Percentile £600 £575 £561
UK excluding London median daily rate £375 £370 £363
% change year-on-year +1.35% +2.07% +8.86%
Number of hourly rates quoted 1288 1301 1951
UK median hourly rate £17.50 £16.25 £16.50
Median hourly rate % change year-on-year +7.69% -1.52% +4.93%
10th Percentile £11.00 £10.63 £10.50
90th Percentile £47.83 £43.75 £42.46
UK excluding London median hourly rate £16.63 £15.26 £16.16
% change year-on-year +8.98% -5.57% +4.26%

CentOS
Job Vacancy Trend

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

Job vacancy trend for CentOS in the UK

CentOS
Contractor Daily Rate Trend

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

Contractor daily rate trend for CentOS in the UK

CentOS
Contractor Daily Rate Histogram

The daily rate distribution of IT jobs citing CentOS over the 6 months to 19 November 2017.

Contractor daily rate histogram for CentOS in the UK

CentOS
Contractor Hourly Rate Trend

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

Contractor hourly rate trend for CentOS in the UK

CentOS
Contractor Hourly Rate Histogram

The hourly rate distribution of IT jobs citing CentOS over the 6 months to 19 November 2017.

Contractor hourly rate histogram for CentOS in the UK

CentOS
Top 15 Contract Locations

The table below looks at the demand and provides a guide to the median contractor rates quoted in IT jobs citing CentOS within the UK over the 6 months to 19 November 2017. 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
England -87 561 £458 -1.08% 82
London -101 328 £491 -1.75% 35
UK excluding London -24 250 £420 -2.33% 52
South East -24 78 £425 -2.86% 15
North of England -3 61 £425 - 16
South West +26 48 £400 -11.11% 6
North West +18 36 £425 - 11
Midlands +22 27 £350 -15.66% 6
Yorkshire -14 24 £450 +5.88% 5
West Midlands +31 17 £425 -2.86% 3
East of England -14 17 £415 +10.67% 4
Scotland +8 14 £400 -27.27% 2
East Midlands +1 10 £290 -25.16% 3
Wales +13 5 £369 -20.91% 3
North East +48 1 - -

For the 6 months to 19 November 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 with a requirement for CentOS.

1 583 (100.00%) Linux
2 316 (54.20%) DevOps
3 296 (50.77%) Red Hat Enterprise Linux
4 285 (48.89%) Red Hat
5 255 (43.74%) Amazon AWS
6 230 (39.45%) Bash Shell
6 230 (39.45%) Python
7 229 (39.28%) Puppet
8 212 (36.36%) Jenkins
9 184 (31.56%) Docker
10 175 (30.02%) VMware
11 173 (29.67%) Ubuntu
12 164 (28.13%) Git (software)
13 159 (27.27%) Agile Software Development
13 159 (27.27%) Ansible
14 150 (25.73%) Java
15 148 (25.39%) Configuration Management
16 122 (20.93%) Security Cleared
17 119 (20.41%) Continuous Integration
18 111 (19.04%) Windows
19 110 (18.87%) DNS
20 106 (18.18%) Unix
20 106 (18.18%) Terraform
21 105 (18.01%) Opscode Chef
22 100 (17.15%) Kubernetes
23 94 (16.12%) Tomcat
23 94 (16.12%) SC Cleared
24 93 (15.95%) Perl
25 88 (15.09%) Ruby
26 87 (14.92%) MySQL

CentOS
Co-occurring IT Skills 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 94 (16.12%) Tomcat
2 70 (12.01%) Apache
3 56 (9.61%) Elasticsearch
4 43 (7.38%) Confluence
5 41 (7.03%) nginx
6 30 (5.15%) OpenStack
7 23 (3.95%) JBoss
8 22 (3.77%) Apache Spark
9 21 (3.60%) WebSphere
10 14 (2.40%) MS Exchange
11 13 (2.23%) Apache Solr
12 10 (1.72%) Jetty
13 9 (1.54%) Apache Pig
14 8 (1.37%) IIS
14 8 (1.37%) SAS
15 7 (1.20%) Cloud Foundry
16 6 (1.03%) ArcGIS
17 4 (0.69%) Adobe Experience Manager
17 4 (0.69%) Drupal
17 4 (0.69%) WordPress
Applications
1 8 (1.37%) Houdini
1 8 (1.37%) Maya
1 8 (1.37%) NUKE
1 8 (1.37%) Photoshop
2 1 (0.17%) HipChat
2 1 (0.17%) Microsoft Excel
2 1 (0.17%) MS Visio
2 1 (0.17%) Stata
Cloud Services
1 255 (43.74%) Amazon AWS
2 60 (10.29%) Amazon EC2
3 48 (8.23%) Microsoft Azure
4 42 (7.20%) Amazon S3
4 42 (7.20%) AWS CloudFormation
5 39 (6.69%) Virtual Private Cloud
6 25 (4.29%) AWS Lambda
6 25 (4.29%) Serverless
7 23 (3.95%) Amazon CloudWatch
8 20 (3.43%) Amazon ELB
9 19 (3.26%) GitHub
10 18 (3.09%) Cloud Computing
10 18 (3.09%) Route 53
11 16 (2.74%) Google Cloud Platform
12 15 (2.57%) Office 365
13 11 (1.89%) IaaS
14 8 (1.37%) Amazon SQS
15 6 (1.03%) Amazon EMR
15 6 (1.03%) SaaS
16 5 (0.86%) CloudFront
Communications & Networking
1 110 (18.87%) DNS
2 82 (14.07%) Firewall
3 46 (7.89%) DHCP
3 46 (7.89%) VPN
4 39 (6.69%) HTTP
5 38 (6.52%) SAN
6 35 (6.00%) LAN
6 35 (6.00%) WAN
7 34 (5.83%) LDAP
8 32 (5.49%) TCP/IP
9 28 (4.80%) SSL
10 23 (3.95%) OpenLDAP
11 20 (3.43%) SMTP
12 19 (3.26%) Network Security
13 17 (2.92%) SSH
14 16 (2.74%) Internet
15 15 (2.57%) OpenVPN
16 13 (2.23%) NetScaler
16 13 (2.23%) VLAN
16 13 (2.23%) Wireless
Database & Business Intelligence
1 87 (14.92%) MySQL
2 64 (10.98%) MongoDB
3 55 (9.43%) PostgreSQL
4 39 (6.69%) Hadoop
5 37 (6.35%) Big Data
6 30 (5.15%) NoSQL
7 28 (4.80%) Apache Cassandra
8 27 (4.63%) Amazon RDS
9 26 (4.46%) Relational Database
10 25 (4.29%) DB2
11 20 (3.43%) Redis
12 18 (3.09%) Apache Hive
13 14 (2.40%) RDBMS
14 13 (2.23%) SQL Server
15 11 (1.89%) Amazon DynamoDB
16 10 (1.72%) Impala
16 10 (1.72%) Riak
17 9 (1.54%) Data Mining
17 9 (1.54%) Data Warehouse
17 9 (1.54%) MarkLogic
Development Applications
1 212 (36.36%) Jenkins
2 164 (28.13%) Git (software)
3 79 (13.55%) Maven
4 54 (9.26%) JIRA
5 44 (7.55%) Sonatype Nexus
6 28 (4.80%) Vagrant
7 27 (4.63%) GitLab
8 26 (4.46%) Bitbucket
9 25 (4.29%) Subversion
10 21 (3.60%) Atlassian Bamboo
11 19 (3.26%) SonarQube
12 17 (2.92%) JUnit
13 16 (2.74%) Ant
14 15 (2.57%) Liquibase
15 14 (2.40%) TeamCity
16 11 (1.89%) Team Foundation Server
17 8 (1.37%) Gradle
17 8 (1.37%) JMeter
17 8 (1.37%) Selenium
18 5 (0.86%) Hudson
General
1 41 (7.03%) Finance
2 18 (3.09%) Retail
3 16 (2.74%) Telecoms
4 13 (2.23%) Games
5 7 (1.20%) Law
6 6 (1.03%) Banking
7 5 (0.86%) Manufacturing
8 3 (0.51%) Advertising
8 3 (0.51%) Marketing
9 2 (0.34%) Electronics
9 2 (0.34%) Publishing
10 1 (0.17%) Aerospace
10 1 (0.17%) Billing
10 1 (0.17%) Financial Institution
10 1 (0.17%) Front Office
10 1 (0.17%) International Banking
10 1 (0.17%) Pharmaceutical
Job Titles
1 225 (38.59%) DevOps Engineer
2 112 (19.21%) Linux Engineer
3 104 (17.84%) Administrator
4 82 (14.07%) Linux/Unix DevOps
5 81 (13.89%) AWS DevOps
6 80 (13.72%) Linux Administrator
7 79 (13.55%) Systems Administrator
8 71 (12.18%) AWS Engineer
9 69 (11.84%) Linux DevOps Engineer
10 65 (11.15%) Linux Systems Administrator
11 54 (9.26%) AWS DevOps Engineer
12 53 (9.09%) Developer
13 39 (6.69%) Consultant
14 38 (6.52%) Systems Engineer
15 29 (4.97%) Senior DevOps
16 27 (4.63%) Linux Systems Engineer
17 24 (4.12%) DevOps Consultant
18 23 (3.95%) Senior DevOps Engineer
18 23 (3.95%) Windows Engineer
19 22 (3.77%) Infrastructure Engineer
Libraries, Frameworks & Software Standards
1 63 (10.81%) Web Services
2 62 (10.63%) Elastic Stack
3 34 (5.83%) LAMP
4 32 (5.49%) MCollective
5 31 (5.32%) REST
6 30 (5.15%) ActiveMQ
7 19 (3.26%) Hibernate
7 19 (3.26%) RabbitMQ
7 19 (3.26%) Spring
8 18 (3.09%) RESTful
8 18 (3.09%) Sensu
8 18 (3.09%) XML
9 16 (2.74%) Kafka
10 14 (2.40%) Java EE
10 14 (2.40%) Node.js
11 13 (2.23%) EJB
11 13 (2.23%) JSON
11 13 (2.23%) SOAP
11 13 (2.23%) Struts
12 12 (2.06%) Natural Language Processing
Miscellaneous
1 43 (7.38%) Linux Command Line
2 34 (5.83%) Replication
3 33 (5.66%) Analytical Skills
4 32 (5.49%) Public Cloud
5 30 (5.15%) Data Centre
6 28 (4.80%) Clustering
7 27 (4.63%) Computer Science
7 27 (4.63%) Greenfield Project
8 19 (3.26%) Device Driver
9 16 (2.74%) PKI
10 12 (2.06%) Algorithms
11 11 (1.89%) Derivative
11 11 (1.89%) Hybrid Cloud
11 11 (1.89%) Private Cloud
12 9 (1.54%) Fintech
13 7 (1.20%) Animation
13 7 (1.20%) Spread Betting
13 7 (1.20%) Video on Demand
14 5 (0.86%) Mobile App
15 3 (0.51%) Enterprise Storage
Operating Systems
1 583 (100.00%) Linux
2 296 (50.77%) Red Hat Enterprise Linux
3 173 (29.67%) Ubuntu
4 111 (19.04%) Windows
5 106 (18.18%) Unix
6 71 (12.18%) Windows Server
7 36 (6.17%) Windows Server 2012
8 35 (6.00%) Debian
9 30 (5.15%) Windows Server 2003
10 17 (2.92%) Solaris
11 14 (2.40%) Windows 7
12 11 (1.89%) Fedora
12 11 (1.89%) SUSE
13 8 (1.37%) Windows Server 2008
14 6 (1.03%) Mac OS X
15 5 (0.86%) CoreOS
16 4 (0.69%) Scientific Linux
17 3 (0.51%) Data ONTAP
17 3 (0.51%) VMS
18 2 (0.34%) Mac OS
Processes & Methodologies
1 316 (54.20%) DevOps
2 159 (27.27%) Agile Software Development
3 148 (25.39%) Configuration Management
4 119 (20.41%) Continuous Integration
5 71 (12.18%) Open Source
6 65 (11.15%) Scrum
7 57 (9.78%) Load Balancing
8 43 (7.38%) Mentoring
9 41 (7.03%) Continuous Delivery
10 38 (6.52%) Test Automation
11 33 (5.66%) Software Engineering
12 32 (5.49%) Migration
13 30 (5.15%) Continuous Deployment
14 27 (4.63%) Service Management
15 26 (4.46%) ITIL
16 22 (3.77%) Immutable Infrastructure
17 20 (3.43%) Patch Management
17 20 (3.43%) SDLC
18 19 (3.26%) Build Automation
18 19 (3.26%) Coaching
Programming Languages
1 230 (39.45%) Bash Shell
1 230 (39.45%) Python
2 150 (25.73%) Java
3 93 (15.95%) Perl
4 88 (15.09%) Ruby
5 55 (9.43%) SQL
6 52 (8.92%) PowerShell
7 50 (8.58%) Shell Script
8 37 (6.35%) JavaScript
9 31 (5.32%) Groovy
10 24 (4.12%) PHP
11 22 (3.77%) C
11 22 (3.77%) C++
12 20 (3.43%) Go
13 15 (2.57%) Scala
14 13 (2.23%) C#
15 11 (1.89%) Korn
16 10 (1.72%) R
17 7 (1.20%) AWK
17 7 (1.20%) Dart
Qualifications
1 122 (20.93%) Security Cleared
2 94 (16.12%) SC Cleared
3 33 (5.66%) Degree
4 12 (2.06%) Cisco Certification
4 12 (2.06%) RHCE
5 11 (1.89%) Computer Science Degree
6 9 (1.54%) CISSP
6 9 (1.54%) Microsoft Certification
6 9 (1.54%) RHCSA
7 8 (1.37%) CCNA
7 8 (1.37%) CESG Certified Professional
8 7 (1.20%) CCNP
8 7 (1.20%) CLAS
9 5 (0.86%) OCA
9 5 (0.86%) OCP
9 5 (0.86%) Oracle Certification
10 4 (0.69%) CISA
10 4 (0.69%) CISMP
10 4 (0.69%) MCSA
10 4 (0.69%) VMware Certified Professional (VCP)
Quality Assurance & Compliance
1 20 (3.43%) QA
2 18 (3.09%) Disclosure Scotland
3 7 (1.20%) ISO/IEC 27001
4 6 (1.03%) JSP 440
4 6 (1.03%) SLA
5 4 (0.69%) GDPR
6 2 (0.34%) GCP
6 2 (0.34%) PCI DSS
6 2 (0.34%) PMO
System Software
1 184 (31.56%) Docker
2 82 (14.07%) VMware Infrastructure
3 58 (9.95%) VMware ESXi
4 53 (9.09%) Active Directory
5 50 (8.58%) Hyper-V
6 41 (7.03%) KVM
7 38 (6.52%) Virtual Machines
8 23 (3.95%) Samba
9 19 (3.26%) NFS
9 19 (3.26%) Squid
9 19 (3.26%) vCloud
10 18 (3.09%) Postfix
11 16 (2.74%) LXC
12 14 (2.40%) iptables
13 10 (1.72%) Xen
14 6 (1.03%) GlusterFS
14 6 (1.03%) vSphere
15 5 (0.86%) HDFS
15 5 (0.86%) Veritas Cluster Server
16 3 (0.51%) Sendmail
Systems Management
1 229 (39.28%) Puppet
2 159 (27.27%) Ansible
3 106 (18.18%) Terraform
4 105 (18.01%) Opscode Chef
5 100 (17.15%) Kubernetes
6 82 (14.07%) Nagios
7 47 (8.06%) logstash
8 39 (6.69%) ZABBIX
9 37 (6.35%) Packer
10 33 (5.66%) Grafana
11 28 (4.80%) Icinga
11 28 (4.80%) Prometheus
12 22 (3.77%) Kibana
12 22 (3.77%) WMI
13 20 (3.43%) Rsyslog
14 18 (3.09%) Galera Cluster
14 18 (3.09%) Rancher
14 18 (3.09%) yum
15 17 (2.92%) Docker Swarm
16 14 (2.40%) Sysdig
Vendors
1 285 (48.89%) Red Hat
2 175 (30.02%) VMware
3 72 (12.35%) Cisco
4 62 (10.63%) Splunk
5 33 (5.66%) Microsoft
6 32 (5.49%) Oracle
7 26 (4.46%) Juniper
7 26 (4.46%) SolarWinds
8 24 (4.12%) Atlassian
9 22 (3.77%) HP
9 22 (3.77%) IBM
10 21 (3.60%) EMC
11 20 (3.43%) Citrix
12 18 (3.09%) Google
13 17 (2.92%) NetApp
14 16 (2.74%) Cloudera
15 15 (2.57%) Sonatype
16 14 (2.40%) Dell
16 14 (2.40%) Extreme Networks
17 13 (2.23%) CheckPoint