Period
to 22 January 2021

The following table provides summary statistics for permanent job vacancies with a requirement for CentOS skills. Included is a benchmarking guide to the salaries offered in vacancies that have cited CentOS over the 6 months to 22 January 2021 with a comparison to the same period in the previous 2 years.

CentOS Linux
UK
6 months to
22 Jan 2021
Same period 2020 Same period 2019
Rank 376 483 420
Rank change year-on-year +107 -63 +1
Permanent jobs citing CentOS 480 703 1,128
As % of all permanent jobs advertised in the UK 0.75% 0.56% 0.74%
As % of the Operating Systems category 3.66% 2.49% 3.19%
Number of salaries quoted 447 626 981
Median annual salary £52,500 £52,500 £55,000
Median salary % change year-on-year - -4.55% +10.00%
10th Percentile £32,500 £31,250 £30,000
90th Percentile £75,000 £78,750 £82,500
UK excluding London median annual salary £48,500 £49,750 £47,500
% change year-on-year -2.51% +4.74% +5.56%

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

All Operating Systems
UK
Permanent vacancies with a requirement for operating system skills 13,119 28,229 35,356
As % of all permanent IT jobs advertised in the UK 20.49% 22.39% 23.28%
Number of salaries quoted 10,730 22,907 28,758
Median annual salary £50,000 £45,000 £47,500
Median salary % change year-on-year +11.11% -5.26% +5.56%
10th Percentile £27,500 £25,000 £25,750
90th Percentile £80,000 £80,000 £78,750
UK excluding London median annual salary £45,000 £41,000 £42,000
% change year-on-year +9.76% -2.38% +5.00%

CentOS
Job Vacancy Trend

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

Job vacancy trend for CentOS in the UK

CentOS
Salary Trend

3-month moving average salary quoted in jobs citing CentOS.

Salary trend for CentOS in the UK

CentOS
Salary Histogram

Salary distribution for jobs citing CentOS over the 6 months to 22 January 2021.

Salary histogram for CentOS in the UK

CentOS
Top 16 Job Locations

The table below looks at the demand and provides a guide to the median salaries quoted in IT jobs citing CentOS within the UK over the 6 months to 22 January 2021. 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
Permanent
IT Job Ads
Median Salary
Past 6 Months
Median Salary
% Change
on Same Period
Last Year
Live
Job
Vacancies
England +99 439 £52,500 -4.55% 130
UK excluding London +161 334 £48,500 -2.51% 86
London +54 129 £67,500 +12.50% 45
South West +65 121 £47,500 -5.00% 15
Work from Home -14 84 £52,500 - 21
South East +132 72 £47,500 -5.00% 29
North of England +94 65 £45,000 -10.00% 23
North West +83 40 £51,250 -2.38% 12
Midlands +67 33 £50,000 +11.11% 13
Yorkshire +53 25 £44,000 -12.00% 6
West Midlands +49 23 £50,000 +11.11% 11
Wales +58 16 £45,000 -5.26%
East of England +89 15 £60,000 +26.32% 5
East Midlands +56 10 £48,750 +8.33% 2
Scotland +46 7 £35,000 +34.62% 1
Northern Ireland +18 5 £52,500 +133.33%

For the 6 months to 22 January 2021, IT 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 permanent job ads with a requirement for CentOS.

1 479 (99.79%) Linux
2 238 (49.58%) DevOps
3 218 (45.42%) Python
4 213 (44.38%) Red Hat
5 191 (39.79%) AWS
6 184 (38.33%) Ansible
7 180 (37.50%) Agile Software Development
8 173 (36.04%) Puppet
9 163 (33.96%) Red Hat Enterprise Linux
10 157 (32.71%) VMware
11 149 (31.04%) Docker
12 146 (30.42%) Ubuntu
13 144 (30.00%) Jenkins
14 142 (29.58%) Windows
15 140 (29.17%) Git (software)
15 140 (29.17%) Bash Shell
16 134 (27.92%) Terraform
17 120 (25.00%) VMware Infrastructure
18 118 (24.58%) Configuration Management
19 109 (22.71%) Azure
20 97 (20.21%) Kubernetes
21 95 (19.79%) Open Source
22 88 (18.33%) Ruby
23 79 (16.46%) Java
24 75 (15.63%) PostgreSQL
24 75 (15.63%) JIRA
25 74 (15.42%) Continuous Integration
26 71 (14.79%) SQL
27 70 (14.58%) MySQL
28 69 (14.38%) Active Directory

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 63 (13.13%) Apache
2 59 (12.29%) Confluence
3 35 (7.29%) Elasticsearch
4 26 (5.42%) nginx
5 19 (3.96%) Tomcat
6 15 (3.13%) Apache Spark
7 14 (2.92%) Apache Solr
7 14 (2.92%) IIS
8 11 (2.29%) WordPress
9 8 (1.67%) Skype for Business
10 6 (1.25%) MS Exchange
10 6 (1.25%) Site Server
11 5 (1.04%) GeoServer
12 4 (0.83%) Apache Pulsar
12 4 (0.83%) GlassFish
12 4 (0.83%) OpenStack
13 2 (0.42%) SharePoint
14 1 (0.21%) Ethereum
14 1 (0.21%) WebSphere
Applications
1 5 (1.04%) Microsoft Office
2 2 (0.42%) Adobe XD
2 2 (0.42%) Photoshop
Business Applications
1 7 (1.46%) Dynamics NAV
2 1 (0.21%) Magento
Cloud Services
1 191 (39.79%) AWS
2 109 (22.71%) Azure
3 38 (7.92%) GCP
4 32 (6.67%) Cloud Computing
4 32 (6.67%) GitHub
5 30 (6.25%) Amazon EC2
6 20 (4.17%) OpenShift
7 18 (3.75%) Virtual Private Cloud
8 17 (3.54%) Amazon S3
9 14 (2.92%) Route 53
10 13 (2.71%) Azure Active Directory
11 11 (2.29%) Amazon EKS
11 11 (2.29%) AWS CloudFormation
12 10 (2.08%) AWS Lambda
12 10 (2.08%) Office 365
12 10 (2.08%) SaaS
12 10 (2.08%) Serverless
13 9 (1.88%) Amazon ElastiCache
13 9 (1.88%) AWS Fargate
14 8 (1.67%) IaaS
Communications & Networking
1 66 (13.75%) DNS
2 64 (13.33%) Firewall
3 55 (11.46%) TCP/IP
4 39 (8.13%) DHCP
5 34 (7.08%) VPN
6 31 (6.46%) HTTP
7 29 (6.04%) IPv4
8 23 (4.79%) WAN
9 21 (4.38%) LAN
9 21 (4.38%) SAN
10 20 (4.17%) FTP
10 20 (4.17%) Internet
11 19 (3.96%) VLAN
12 13 (2.71%) IMAP
12 13 (2.71%) SMTP
13 12 (2.50%) Intrusion Detection
13 12 (2.50%) IPv6
14 11 (2.29%) OSPF
15 9 (1.88%) Cisco IOS
15 9 (1.88%) SSH
Database & Business Intelligence
1 75 (15.63%) PostgreSQL
2 70 (14.58%) MySQL
3 44 (9.17%) SQL Server
4 40 (8.33%) MongoDB
5 34 (7.08%) Big Data
6 31 (6.46%) Hadoop
6 31 (6.46%) NoSQL
6 31 (6.46%) Redis
7 26 (5.42%) MariaDB
8 19 (3.96%) Amazon RDS
9 15 (3.13%) Apache Cassandra
10 13 (2.71%) Relational Database
11 7 (1.46%) Apache Accumulo
11 7 (1.46%) SQL Server 2005
11 7 (1.46%) SQL Server 2008
11 7 (1.46%) SQL Server 2012
12 6 (1.25%) Couchbase
12 6 (1.25%) CouchDB
12 6 (1.25%) RDBMS
13 5 (1.04%) Impala
Development Applications
1 144 (30.00%) Jenkins
2 140 (29.17%) Git (software)
3 75 (15.63%) JIRA
4 48 (10.00%) GitLab
5 33 (6.88%) Atlassian Bamboo
6 18 (3.75%) Artifactory
7 16 (3.33%) Bitbucket
7 16 (3.33%) TeamCity
8 14 (2.92%) Gerrit
8 14 (2.92%) Subversion
9 10 (2.08%) Selenium
10 9 (1.88%) Travis CI
11 8 (1.67%) Sonatype Nexus
12 7 (1.46%) Octopus Deploy
13 6 (1.25%) Visual Studio Team System
14 5 (1.04%) Maven
14 5 (1.04%) Vagrant
15 4 (0.83%) GoCD
16 3 (0.63%) Chocolatey
16 3 (0.63%) JUnit
General
1 67 (13.96%) Public Sector
2 48 (10.00%) Finance
3 30 (6.25%) Marketing
4 18 (3.75%) Telecoms
5 17 (3.54%) Legal
6 16 (3.33%) Electronics
6 16 (3.33%) Manufacturing
7 14 (2.92%) Games
8 12 (2.50%) Law
9 11 (2.29%) Advertising
10 7 (1.46%) Banking
11 6 (1.25%) Publishing
12 4 (0.83%) Aerospace
12 4 (0.83%) Retail
13 3 (0.63%) Front Office
14 2 (0.42%) Back Office
15 1 (0.21%) Military
Job Titles
1 146 (30.42%) DevOps Engineer
2 136 (28.33%) Linux Engineer
3 58 (12.08%) Infrastructure Engineer
4 54 (11.25%) Systems Administrator
5 49 (10.21%) Administrator
6 48 (10.00%) Developer
7 42 (8.75%) Senior DevOps
8 37 (7.71%) Platform Engineer
9 36 (7.50%) Linux/Unix DevOps
9 36 (7.50%) Senior DevOps Engineer
10 34 (7.08%) Linux DevOps Engineer
11 33 (6.88%) Linux Systems Engineer
12 32 (6.67%) Linux Systems Administrator
12 32 (6.67%) Systems Engineer
13 30 (6.25%) Linux Infrastructure Engineer
14 28 (5.83%) Senior Linux Engineer
15 21 (4.38%) Linux Administrator
15 21 (4.38%) Software Engineer
16 18 (3.75%) Cloud Engineer
16 18 (3.75%) PHP Developer
Libraries, Frameworks & Software Standards
1 58 (12.08%) Elastic Stack
2 45 (9.38%) Web Services
3 35 (7.29%) HTML
4 32 (6.67%) Kafka
4 32 (6.67%) LAMP
5 27 (5.63%) CSS
6 26 (5.42%) LEMP Stack
7 22 (4.58%) Apache NiFi
8 19 (3.96%) XML
9 18 (3.75%) .NET
9 18 (3.75%) LDAP
10 17 (3.54%) RESTful
10 17 (3.54%) YAML
11 16 (3.33%) LAPP Stack
11 16 (3.33%) Node.js
11 16 (3.33%) RabbitMQ
12 15 (3.13%) REST
13 13 (2.71%) jQuery
13 13 (2.71%) JSON
13 13 (2.71%) Middleware
Miscellaneous
1 37 (7.71%) Data Centre
2 22 (4.58%) Linux Command Line
2 22 (4.58%) Public Cloud
3 16 (3.33%) Cyberattack
4 14 (2.92%) Clustering
5 12 (2.50%) Greenfield Project
6 8 (1.67%) Analytical Skills
6 8 (1.67%) PKI
6 8 (1.67%) Replication
7 7 (1.46%) Hybrid Cloud
7 7 (1.46%) Management Information System
8 6 (1.25%) Xbox
9 5 (1.04%) PMI
9 5 (1.04%) Self-Motivation
10 4 (0.83%) Media Streaming
10 4 (0.83%) Virtual Team
11 2 (0.42%) Eurex
12 1 (0.21%) Cybercrime
12 1 (0.21%) Private Cloud
12 1 (0.21%) User Experience
Operating Systems
1 479 (99.79%) Linux
2 163 (33.96%) Red Hat Enterprise Linux
3 146 (30.42%) Ubuntu
4 142 (29.58%) Windows
5 54 (11.25%) Windows Server
6 53 (11.04%) Unix
7 43 (8.96%) Debian
8 38 (7.92%) Fedora
9 30 (6.25%) Windows Server 2016
10 22 (4.58%) Windows Server 2012
11 19 (3.96%) Windows Server 2008
12 13 (2.71%) Windows 7
13 12 (2.50%) Windows 10
14 10 (2.08%) Amazon Linux
15 9 (1.88%) AIX
16 7 (1.46%) Mac OS X
17 5 (1.04%) Oracle Linux
17 5 (1.04%) Solaris
18 4 (0.83%) VMS
19 3 (0.63%) FreeBSD
Processes & Methodologies
1 238 (49.58%) DevOps
2 180 (37.50%) Agile Software Development
3 118 (24.58%) Configuration Management
4 95 (19.79%) Open Source
5 74 (15.42%) Continuous Integration
6 68 (14.17%) Infrastructure Engineering
7 58 (12.08%) Microservices
8 54 (11.25%) Problem-Solving
9 53 (11.04%) Infrastructure as Code
10 52 (10.83%) Scrum
11 48 (10.00%) Continuous Delivery
12 47 (9.79%) Software Engineering
13 41 (8.54%) Site Reliability Engineering
14 38 (7.92%) Load Balancing
15 37 (7.71%) High Availability
15 37 (7.71%) ITIL
16 36 (7.50%) IT Strategy
16 36 (7.50%) Machine Learning
17 34 (7.08%) Data Science
18 33 (6.88%) DevSecOps
Programming Languages
1 218 (45.42%) Python
2 140 (29.17%) Bash Shell
3 88 (18.33%) Ruby
4 79 (16.46%) Java
5 71 (14.79%) SQL
6 63 (13.13%) Shell Script
7 58 (12.08%) PowerShell
8 52 (10.83%) Perl
9 45 (9.38%) PHP
10 41 (8.54%) JavaScript
11 34 (7.08%) Go
12 33 (6.88%) C
13 23 (4.79%) C#
14 14 (2.92%) C++
14 14 (2.92%) Groovy
15 12 (2.50%) PL/SQL
16 9 (1.88%) PHP 5
17 6 (1.25%) Bourne shell
18 4 (0.83%) Lua
19 3 (0.63%) TypeScript
Qualifications
1 52 (10.83%) Security Cleared
2 39 (8.13%) SC Cleared
3 30 (6.25%) AWS Certification
4 26 (5.42%) Degree
5 15 (3.13%) RHCE
6 9 (1.88%) CCNA
6 9 (1.88%) Cisco Certification
7 8 (1.67%) Computer Science Degree
8 5 (1.04%) DV Cleared
8 5 (1.04%) PMI Certification
9 3 (0.63%) MCSA
9 3 (0.63%) Microsoft Certification
10 1 (0.21%) LPIC
10 1 (0.21%) MCP
10 1 (0.21%) MCSE
10 1 (0.21%) RHCA
Quality Assurance & Compliance
1 16 (3.33%) QA
2 12 (2.50%) SLA
3 10 (2.08%) ISO/IEC 27001
4 5 (1.04%) PCI DSS
5 4 (0.83%) ISO 9001
5 4 (0.83%) OpenSCAP
6 2 (0.42%) WCAG
7 1 (0.21%) GDPR
7 1 (0.21%) HMG Security Policy Framework
System Software
1 149 (31.04%) Docker
2 120 (25.00%) VMware Infrastructure
3 69 (14.38%) Active Directory
4 35 (7.29%) vSphere
5 33 (6.88%) VMware ESXi
6 26 (5.42%) Hyper-V
7 19 (3.96%) KVM
8 14 (2.92%) Xen
9 10 (2.08%) Apache ZooKeeper
9 10 (2.08%) NFS
9 10 (2.08%) Samba
10 8 (1.67%) Citrix Hypervisor
10 8 (1.67%) Slurm Workload Manager
10 8 (1.67%) XenApp
10 8 (1.67%) XenDesktop
11 7 (1.46%) oVirt
11 7 (1.46%) VirtualBox
12 6 (1.25%) Ceph
12 6 (1.25%) LXC
12 6 (1.25%) Postfix
Systems Management
1 184 (38.33%) Ansible
2 173 (36.04%) Puppet
3 134 (27.92%) Terraform
4 97 (20.21%) Kubernetes
5 42 (8.75%) Prometheus
6 40 (8.33%) Grafana
7 38 (7.92%) Opscode Chef
8 37 (7.71%) Nagios
9 32 (6.67%) Graphite
10 25 (5.21%) HAProxy
11 17 (3.54%) Icinga
12 14 (2.92%) ZABBIX
13 12 (2.50%) Docker Swarm
14 10 (2.08%) SCCM
15 9 (1.88%) vCenter Server
16 8 (1.67%) Capistrano
16 8 (1.67%) Kibana
16 8 (1.67%) Oracle ZFS
16 8 (1.67%) Red Hat Spacewalk
17 7 (1.46%) Galera Cluster
Vendors
1 213 (44.38%) Red Hat
2 157 (32.71%) VMware
3 52 (10.83%) Microsoft
4 34 (7.08%) Oracle
5 33 (6.88%) Atlassian
6 27 (5.63%) Google
7 24 (5.00%) Splunk
8 19 (3.96%) Dell
9 16 (3.33%) Cisco
9 16 (3.33%) SAP
10 13 (2.71%) ServiceNow
11 12 (2.50%) F5
12 8 (1.67%) HP
12 8 (1.67%) Veeam
13 7 (1.46%) EMC
13 7 (1.46%) Isilon
14 6 (1.25%) Citrix
14 6 (1.25%) Juniper
14 6 (1.25%) SaltStack
15 5 (1.04%) SonicWALL