Period
to 26 July 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 26 July 2021 with a comparison to the same period in the previous 2 years.

CentOS Linux
UK
6 months to
26 Jul 2021
Same period 2020 Same period 2019
Rank 497 429 429
Rank change year-on-year -68 0 +37
Permanent jobs citing CentOS 615 445 1,060
As % of all permanent jobs advertised in the UK 0.55% 0.63% 0.73%
As % of the Operating Systems category 2.99% 2.98% 3.19%
Number of salaries quoted 369 347 868
10th Percentile £36,250 £32,300 £31,250
25th Percentile £42,500 £40,000 £37,500
Median annual salary (50th Percentile) £55,000 £51,593 £49,500
Median % change year-on-year +6.60% +4.23% -5.71%
75th Percentile £72,500 £69,375 £65,000
90th Percentile £85,000 £82,500 £77,500
UK excluding London median annual salary £46,500 £45,000 £45,000
% change year-on-year +3.33% - -

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 20,553 14,939 33,229
As % of all permanent IT jobs advertised in the UK 18.26% 21.13% 22.88%
Number of salaries quoted 14,959 12,322 26,627
10th Percentile £27,000 £27,500 £25,750
25th Percentile £36,250 £35,846 £32,500
Median annual salary (50th Percentile) £50,000 £50,000 £46,500
Median % change year-on-year - +7.53% -2.11%
75th Percentile £67,500 £66,250 £65,000
90th Percentile £85,000 £80,000 £80,000
UK excluding London median annual salary £45,000 £45,000 £41,500
% change year-on-year - +8.43% +2.47%

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 26 July 2021.

Salary histogram for CentOS in the UK

CentOS
Top 17 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 26 July 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 -69 573 £55,000 +4.76% 106
UK excluding London -15 405 £46,500 +3.33% 85
London -124 180 £70,000 +7.69% 27
South West +2 159 £47,500 +17.44% 11
Work from Home -188 91 £60,000 +14.29% 24
South East -37 89 £47,500 +5.56% 24
North of England -59 60 £47,000 +4.44% 13
Midlands -54 44 £42,750 -2.29% 20
North West -29 40 £50,000 +5.26% 9
East of England -17 28 £50,000 -6.98% 11
West Midlands -49 28 £67,500 +80.00% 13
Wales -2 21 £42,500 -5.56% 3
East Midlands -42 16 £40,000 -8.57% 7
North East -11 10 £44,500 +67.92% 1
Yorkshire -57 10 £37,500 -16.67% 3
Scotland -72 4 £39,846 +6.26% 3
Northern Ireland -33 1 £55,000 -

For the 6 months to 26 July 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.

1 615 (100.00%) Linux
2 314 (51.06%) Python
3 289 (46.99%) AWS
4 283 (46.02%) DevOps
5 282 (45.85%) Ansible
6 277 (45.04%) Red Hat
7 243 (39.51%) Docker
8 234 (38.05%) Agile Software Development
9 220 (35.77%) Ubuntu
9 220 (35.77%) Bash Shell
9 220 (35.77%) Puppet
10 213 (34.63%) Windows
11 201 (32.68%) Azure
12 193 (31.38%) VMware
13 190 (30.89%) Red Hat Enterprise Linux
14 169 (27.48%) Git (software)
15 159 (25.85%) Configuration Management
16 158 (25.69%) Jenkins
17 150 (24.39%) VMware Infrastructure
18 145 (23.58%) Windows Server
19 137 (22.28%) Microsoft
20 135 (21.95%) Terraform
21 133 (21.63%) Kubernetes
22 129 (20.98%) PowerShell
22 129 (20.98%) JIRA
23 128 (20.81%) Scrum
23 128 (20.81%) Firewall
24 125 (20.33%) Java
25 124 (20.16%) Finance
26 114 (18.54%) Confluence

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
1 114 (18.54%) Confluence
2 82 (13.33%) Apache
3 45 (7.32%) nginx
4 42 (6.83%) Tomcat
5 40 (6.50%) Elasticsearch
6 29 (4.72%) IIS
7 15 (2.44%) SharePoint
8 13 (2.11%) JBoss
9 10 (1.63%) Apache Spark
9 10 (1.63%) OpenStack
10 5 (0.81%) WordPress
11 2 (0.33%) Apache Solr
11 2 (0.33%) CMS
11 2 (0.33%) GlassFish
11 2 (0.33%) MS Exchange
11 2 (0.33%) Traffic Server
12 1 (0.16%) Apache Pulsar
12 1 (0.16%) Oracle SOA Suite
12 1 (0.16%) Red Hat Fuse
12 1 (0.16%) Skype for Business
Applications
1 5 (0.81%) Microsoft Office
2 4 (0.65%) Maya
2 4 (0.65%) NUKE
2 4 (0.65%) Photoshop
3 3 (0.49%) Houdini
3 3 (0.49%) MS Visio
4 1 (0.16%) Adobe After Effects
4 1 (0.16%) Adobe XD
4 1 (0.16%) Microsoft Project
Business Applications
1 7 (1.14%) Dynamics NAV
2 1 (0.16%) Oracle Procure-to-Pay
Cloud Services
1 289 (46.99%) AWS
2 201 (32.68%) Azure
3 62 (10.08%) GCP
4 51 (8.29%) Amazon EC2
5 37 (6.02%) SaaS
6 36 (5.85%) Microsoft 365
7 34 (5.53%) OpenShift
8 31 (5.04%) GitHub
9 29 (4.72%) Amazon ECS
10 28 (4.55%) Amazon S3
11 27 (4.39%) Amazon EKS
12 24 (3.90%) AWS CloudFormation
13 23 (3.74%) Cloud Computing
14 21 (3.41%) Azure Active Directory
15 18 (2.93%) Virtual Private Cloud
16 13 (2.11%) OneDrive
17 11 (1.79%) AWS Fargate
17 11 (1.79%) AWS Lambda
17 11 (1.79%) Serverless
18 10 (1.63%) AWS Direct Connect
Communications & Networking
1 128 (20.81%) Firewall
2 91 (14.80%) DNS
3 86 (13.98%) VPN
4 58 (9.43%) IPv4
5 57 (9.27%) VLAN
6 46 (7.48%) HTTP
7 45 (7.32%) OSPF
8 43 (6.99%) DHCP
9 41 (6.67%) TCP/IP
10 21 (3.41%) SNMP
11 20 (3.25%) SSH
12 19 (3.09%) Broadband
13 18 (2.93%) IPv6
13 18 (2.93%) Network Security
13 18 (2.93%) SAN
14 17 (2.76%) FIX Connectivity
14 17 (2.76%) VoIP
15 16 (2.60%) BGP
16 14 (2.28%) WAN
17 12 (1.95%) Internet
Database & Business Intelligence
1 102 (16.59%) MySQL
2 77 (12.52%) PostgreSQL
3 53 (8.62%) SQL Server
4 52 (8.46%) MongoDB
5 50 (8.13%) Big Data
6 36 (5.85%) Hadoop
7 23 (3.74%) NoSQL
8 22 (3.58%) MariaDB
9 20 (3.25%) Amazon RDS
10 9 (1.46%) Relational Database
11 7 (1.14%) SQL Server 2005
11 7 (1.14%) SQL Server 2008
11 7 (1.14%) SQL Server 2012
12 6 (0.98%) Redis
13 4 (0.65%) Apache Cassandra
13 4 (0.65%) RDBMS
14 3 (0.49%) GIS
14 3 (0.49%) Tableau
14 3 (0.49%) Tableau Server
15 2 (0.33%) Data Warehouse
Development Applications
1 169 (27.48%) Git (software)
2 158 (25.69%) Jenkins
3 129 (20.98%) JIRA
4 41 (6.67%) Subversion
5 39 (6.34%) GitLab
6 27 (4.39%) Atlassian Bamboo
7 24 (3.90%) Bitbucket
7 24 (3.90%) Eclipse
8 23 (3.74%) Cucumber
9 21 (3.41%) Selenium
10 20 (3.25%) JMeter
10 20 (3.25%) Robot Framework
11 14 (2.28%) TeamCity
12 12 (1.95%) Maven
13 8 (1.30%) IntelliJ
14 7 (1.14%) GoCD
14 7 (1.14%) Octopus Deploy
14 7 (1.14%) Travis CI
15 6 (0.98%) SonarQube
15 6 (0.98%) TestNG
General
1 124 (20.16%) Finance
2 76 (12.36%) Social Skills
3 41 (6.67%) Legal
4 37 (6.02%) Public Sector
5 28 (4.55%) Telecoms
6 19 (3.09%) Advertising
7 18 (2.93%) Marketing
8 16 (2.60%) Analytical Skills
9 15 (2.44%) Banking
10 12 (1.95%) Law
11 10 (1.63%) Electronics
11 10 (1.63%) Manufacturing
12 9 (1.46%) Back Office
13 8 (1.30%) Documentation Skills
14 7 (1.14%) iGaming
15 6 (0.98%) Retail
16 2 (0.33%) Local Government
17 1 (0.16%) International Banking
17 1 (0.16%) Investment Banking
17 1 (0.16%) Retail Banking
Job Titles
1 123 (20.00%) DevOps Engineer
2 107 (17.40%) Linux Engineer
3 80 (13.01%) Infrastructure Engineer
4 57 (9.27%) Developer
5 54 (8.78%) Administrator
6 46 (7.48%) Cloud Engineer
7 45 (7.32%) Software Engineer
8 41 (6.67%) AWS Engineer
9 39 (6.34%) Architect
10 36 (5.85%) Senior Software Engineer
11 29 (4.72%) Platform Engineer
12 28 (4.55%) Linux/Unix DevOps
12 28 (4.55%) Systems Administrator
13 27 (4.39%) Java Developer
14 26 (4.23%) DBA
14 26 (4.23%) Linux DevOps Engineer
14 26 (4.23%) Senior Infrastructure Engineer
15 25 (4.07%) Linux Infrastructure Engineer
16 24 (3.90%) Senior DevOps
16 24 (3.90%) Senior DevOps Engineer
Libraries, Frameworks & Software Standards
1 76 (12.36%) Elastic Stack
2 74 (12.03%) Web Services
3 71 (11.54%) Kafka
4 63 (10.24%) LAMP
5 62 (10.08%) Apache NiFi
6 53 (8.62%) HTML
7 39 (6.34%) CSS
8 33 (5.37%) Node.js
9 32 (5.20%) LAPP Stack
10 29 (4.72%) LEMP Stack
11 27 (4.39%) HTML5
12 26 (4.23%) Spring Boot
12 26 (4.23%) Twitter Bootstrap
13 24 (3.90%) ActiveMQ
14 23 (3.74%) React
15 22 (3.58%) Gherkin
16 21 (3.41%) CSS3
17 20 (3.25%) FIX Protocol
17 20 (3.25%) REST
18 14 (2.28%) jQuery
Miscellaneous
1 59 (9.59%) Cyberattack
2 53 (8.62%) Data Centre
3 45 (7.32%) Hybrid Cloud
4 44 (7.15%) Public Cloud
5 25 (4.07%) Linux Command Line
6 24 (3.90%) User Experience
7 22 (3.58%) Clustering
8 13 (2.11%) Eurex
9 11 (1.79%) PKI
10 9 (1.46%) Distributed Denial-of-Service
11 7 (1.14%) Enterprise Software
11 7 (1.14%) Private Cloud
12 6 (0.98%) Algorithms
12 6 (0.98%) Field-Programmable Gate Array
12 6 (0.98%) Foreign Exchange (FX)
13 5 (0.81%) Client/Server
13 5 (0.81%) Derivative
13 5 (0.81%) Fixed Income
13 5 (0.81%) Management Information System
13 5 (0.81%) Virtual Team
Operating Systems
1 615 (100.00%) Linux
2 220 (35.77%) Ubuntu
3 213 (34.63%) Windows
4 190 (30.89%) Red Hat Enterprise Linux
5 145 (23.58%) Windows Server
6 76 (12.36%) Windows Server 2016
7 73 (11.87%) Unix
8 56 (9.11%) Debian
9 30 (4.88%) Windows Server 2019
10 23 (3.74%) Windows Server 2012
11 18 (2.93%) Fedora
12 15 (2.44%) Solaris
13 13 (2.11%) Amazon Linux
14 9 (1.46%) Windows 10
15 8 (1.30%) AIX
16 5 (0.81%) SUSE
17 4 (0.65%) Android
17 4 (0.65%) CoreOS
18 3 (0.49%) Oracle Linux
18 3 (0.49%) Windows 7
Processes & Methodologies
1 283 (46.02%) DevOps
2 234 (38.05%) Agile Software Development
3 159 (25.85%) Configuration Management
4 128 (20.81%) Scrum
5 113 (18.37%) Software Engineering
6 107 (17.40%) Infrastructure Engineering
7 106 (17.24%) Site Reliability Engineering
8 103 (16.75%) Open Source
9 96 (15.61%) Infrastructure as Code
10 95 (15.45%) ITIL
11 92 (14.96%) Machine Learning
12 90 (14.63%) Cyber Intelligence
12 90 (14.63%) Data Science
12 90 (14.63%) DevSecOps
12 90 (14.63%) Scaled Agile Framework
13 89 (14.47%) Mentoring
14 88 (14.31%) Continuous Integration
15 75 (12.20%) Cybersecurity
15 75 (12.20%) Microservices
16 70 (11.38%) Task Automation
Programming Languages
1 314 (51.06%) Python
2 220 (35.77%) Bash Shell
3 129 (20.98%) PowerShell
4 125 (20.33%) Java
5 99 (16.10%) SQL
6 74 (12.03%) JavaScript
7 64 (10.41%) C++
8 56 (9.11%) Ruby
9 55 (8.94%) C
10 50 (8.13%) Perl
11 43 (6.99%) Go
12 39 (6.34%) PHP
13 30 (4.88%) Shell Script
14 24 (3.90%) C#
15 17 (2.76%) Groovy
16 7 (1.14%) Java 8
17 6 (0.98%) PHP 7
18 5 (0.81%) TypeScript
19 4 (0.65%) Kotlin
19 4 (0.65%) Lua
Qualifications
1 111 (18.05%) Security Cleared
2 79 (12.85%) SC Cleared
3 56 (9.11%) Degree
4 38 (6.18%) AWS Certification
5 33 (5.37%) DV Cleared
6 30 (4.88%) RHCE
7 20 (3.25%) RHCSA
8 19 (3.09%) CCNA
8 19 (3.09%) Cisco Certification
9 8 (1.30%) Computer Science Degree
9 8 (1.30%) Microsoft Certification
10 7 (1.14%) CCENT
11 4 (0.65%) MCSA
12 3 (0.49%) CompTIA Security+
12 3 (0.49%) MCSE
12 3 (0.49%) Network+ Certification
13 2 (0.33%) DBS Check
13 2 (0.33%) GIAC
13 2 (0.33%) Linux+ Certification
13 2 (0.33%) SANS
Quality Assurance & Compliance
1 19 (3.09%) QA
2 10 (1.63%) ISO/IEC 27001
2 10 (1.63%) PCI DSS
3 6 (0.98%) Cyber Essentials
4 5 (0.81%) Cyber Essentials PLUS
5 3 (0.49%) SLA
6 2 (0.33%) OpenSCAP
7 1 (0.16%) Accessibility
7 1 (0.16%) GDPR
7 1 (0.16%) NIST
7 1 (0.16%) Sarbanes-Oxley
7 1 (0.16%) WCAG
System Software
1 243 (39.51%) Docker
2 150 (24.39%) VMware Infrastructure
3 90 (14.63%) Active Directory
4 47 (7.64%) VMware ESXi
5 45 (7.32%) vSphere
6 21 (3.41%) iptables
7 16 (2.60%) NFS
8 15 (2.44%) Hyper-V
9 10 (1.63%) XenApp
9 10 (1.63%) XenDesktop
10 9 (1.46%) KVM
11 8 (1.30%) Virtual Servers
12 7 (1.14%) Samba
12 7 (1.14%) Virtual Machines
13 5 (0.81%) Firmware
13 5 (0.81%) Postfix
14 4 (0.65%) Kamailio
14 4 (0.65%) OpenSIPS
14 4 (0.65%) Xen
15 3 (0.49%) Xsan
Systems Management
1 282 (45.85%) Ansible
2 220 (35.77%) Puppet
3 135 (21.95%) Terraform
4 133 (21.63%) Kubernetes
5 43 (6.99%) Grafana
6 42 (6.83%) Docker Swarm
6 42 (6.83%) Prometheus
7 40 (6.50%) Opscode Chef
8 29 (4.72%) Packer
9 26 (4.23%) ZABBIX
10 23 (3.74%) Graphite
10 23 (3.74%) HAProxy
11 19 (3.09%) Consul
12 18 (2.93%) Nagios
13 16 (2.60%) Icinga
14 12 (1.95%) Red Hat Satellite
14 12 (1.95%) Salt
15 10 (1.63%) Rundeck
16 8 (1.30%) Failover Clustering
16 8 (1.30%) SCCM
Vendors
1 277 (45.04%) Red Hat
2 193 (31.38%) VMware
3 137 (22.28%) Microsoft
4 78 (12.68%) Oracle
5 56 (9.11%) Cisco
6 50 (8.13%) Google
7 36 (5.85%) Atlassian
8 28 (4.55%) HP
9 20 (3.25%) Juniper
10 17 (2.76%) NetApp
11 16 (2.60%) Dell
11 16 (2.60%) F5
12 14 (2.28%) Solarflare
13 13 (2.11%) Bloomberg
13 13 (2.11%) CQG
13 13 (2.11%) ION Trading
13 13 (2.11%) Patsystems
13 13 (2.11%) Reuters
13 13 (2.11%) SolarWinds
13 13 (2.11%) Trayport