Period
to 19 October 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 19 October 2021 with a comparison to the same period in the previous 2 years.

CentOS Linux
UK
6 months to
19 Oct 2021
Same period 2020 Same period 2019
Rank 577 361 439
Rank change year-on-year -216 +78 +10
Permanent jobs citing CentOS 554 385 920
As % of all permanent jobs advertised in the UK 0.44% 0.80% 0.67%
As % of the Operating Systems category 2.53% 3.70% 2.94%
Number of salaries quoted 351 290 755
10th Percentile £37,500 £33,975 £31,250
25th Percentile £42,500 £41,250 £37,500
Median annual salary (50th Percentile) £55,000 £51,250 £50,000
Median % change year-on-year +7.32% +2.50% -9.09%
75th Percentile £72,500 £70,000 £63,750
90th Percentile £85,000 £75,000 £76,250
UK excluding London median annual salary £45,000 £45,000 £47,500
% change year-on-year - -5.26% -

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 21,881 10,403 31,338
As % of all permanent IT jobs advertised in the UK 17.42% 21.48% 22.99%
Number of salaries quoted 15,497 8,716 25,138
10th Percentile £26,250 £28,500 £25,000
25th Percentile £35,000 £36,750 £32,000
Median annual salary (50th Percentile) £50,000 £50,000 £45,000
Median % change year-on-year - +11.11% -5.26%
75th Percentile £67,500 £66,250 £63,750
90th Percentile £85,000 £80,000 £80,000
UK excluding London median annual salary £45,000 £45,000 £41,000
% change year-on-year - +9.76% -

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 19 October 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 19 October 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 -215 487 £55,000 +4.76% 92
UK excluding London -141 371 £45,000 - 71
London -224 144 £67,500 -3.57% 25
South West -65 117 £47,500 +3.26% 12
Work from Home -186 117 £60,000 +9.09% 19
South East -111 91 £45,000 -10.00% 26
North of England -127 57 £50,000 +11.11% 11
Midlands -91 43 £37,500 -11.76% 11
North West -99 37 £50,000 -2.44% 7
Wales -31 31 £42,500 -5.56% 3
West Midlands -105 28 £50,000 +66.67% 6
East of England -95 24 £55,000 +0.92% 7
East Midlands -67 15 £32,500 -25.71% 5
Yorkshire -119 13 £50,000 +33.33% 1
Scotland -88 8 £39,846 +13.85% 1
North East -23 7 £49,500 - 3

For the 6 months to 19 October 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.

1 554 (100.00%) Linux
2 301 (54.33%) Python
3 254 (45.85%) Red Hat
4 238 (42.96%) Ansible
5 237 (42.78%) AWS
6 226 (40.79%) DevOps
7 191 (34.48%) Red Hat Enterprise Linux
8 187 (33.75%) Agile Software Development
9 185 (33.39%) Bash Shell
10 181 (32.67%) Docker
11 163 (29.42%) Windows
12 153 (27.62%) Puppet
12 153 (27.62%) Azure
13 150 (27.08%) Ubuntu
14 146 (26.35%) Jenkins
15 143 (25.81%) VMware
16 129 (23.29%) Finance
17 126 (22.74%) Git (software)
18 117 (21.12%) Java
19 115 (20.76%) Software Engineering
20 114 (20.58%) VMware Infrastructure
21 113 (20.40%) MySQL
22 107 (19.31%) Terraform
23 106 (19.13%) Kubernetes
24 103 (18.59%) Windows Server
24 103 (18.59%) PowerShell
25 92 (16.61%) Configuration Management
26 90 (16.25%) Active Directory
27 89 (16.06%) Scrum
28 88 (15.88%) Microsoft

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 83 (14.98%) Apache
2 66 (11.91%) Confluence
3 40 (7.22%) Elasticsearch
4 36 (6.50%) Tomcat
5 32 (5.78%) nginx
6 18 (3.25%) SharePoint
7 15 (2.71%) IIS
8 14 (2.53%) Apache Spark
9 11 (1.99%) WordPress
10 9 (1.62%) JBoss
10 9 (1.62%) OpenStack
11 2 (0.36%) Cloud Foundry
11 2 (0.36%) CloudStack
11 2 (0.36%) CMS
11 2 (0.36%) Jetty
11 2 (0.36%) Skype for Business
11 2 (0.36%) Traffic Server
12 1 (0.18%) Apache Airflow
12 1 (0.18%) Oracle SOA Suite
12 1 (0.18%) Red Hat Fuse
Applications
1 4 (0.72%) Microsoft Office
1 4 (0.72%) MS Visio
2 1 (0.18%) Adobe After Effects
2 1 (0.18%) Maya
2 1 (0.18%) Microsoft Project
2 1 (0.18%) NUKE
Business Applications
1 3 (0.54%) Oracle Procure-to-Pay
1 3 (0.54%) SAP Business One
2 2 (0.36%) Remedy ITSM
3 1 (0.18%) Payment Gateway
Cloud Services
1 237 (42.78%) AWS
2 153 (27.62%) Azure
3 55 (9.93%) SaaS
4 53 (9.57%) GCP
5 47 (8.48%) Amazon EC2
6 41 (7.40%) OpenShift
7 36 (6.50%) Microsoft 365
8 23 (4.15%) GitHub
9 18 (3.25%) AWS CloudFormation
9 18 (3.25%) Cloud Computing
10 17 (3.07%) Amazon S3
10 17 (3.07%) OneDrive
11 15 (2.71%) Amazon ECS
11 15 (2.71%) Amazon EKS
11 15 (2.71%) Virtual Private Cloud
12 14 (2.53%) IaaS
12 14 (2.53%) PaaS
13 13 (2.35%) Amazon CloudWatch
14 12 (2.17%) Azure Active Directory
15 10 (1.81%) AWS Direct Connect
Communications & Networking
1 81 (14.62%) Firewall
1 81 (14.62%) VPN
2 78 (14.08%) DNS
3 39 (7.04%) TCP/IP
4 38 (6.86%) HTTP
5 35 (6.32%) DHCP
6 32 (5.78%) OSPF
7 29 (5.23%) IPv4
8 28 (5.05%) VLAN
9 25 (4.51%) LAN
9 25 (4.51%) WAN
10 24 (4.33%) IPv6
11 23 (4.15%) Broadband
11 23 (4.15%) SNMP
12 20 (3.61%) SSH
13 19 (3.43%) BGP
13 19 (3.43%) Network Security
14 18 (3.25%) FIX Connectivity
15 16 (2.89%) SSL
16 14 (2.53%) NetScaler
Database & Business Intelligence
1 113 (20.40%) MySQL
2 78 (14.08%) PostgreSQL
3 67 (12.09%) MongoDB
4 44 (7.94%) Big Data
4 44 (7.94%) SQL Server
5 40 (7.22%) Hadoop
5 40 (7.22%) MariaDB
6 24 (4.33%) NoSQL
7 20 (3.61%) Amazon RDS
8 16 (2.89%) Redis
9 8 (1.44%) RDBMS
9 8 (1.44%) Relational Database
10 7 (1.26%) Apache Cassandra
11 2 (0.36%) ArangoDB
11 2 (0.36%) GIS
11 2 (0.36%) Oracle Database
11 2 (0.36%) Tableau
11 2 (0.36%) Tableau Server
12 1 (0.18%) ClickHouse
12 1 (0.18%) Scylla
Development Applications
1 146 (26.35%) Jenkins
2 126 (22.74%) Git (software)
3 85 (15.34%) JIRA
4 29 (5.23%) Eclipse
5 26 (4.69%) Cucumber
5 26 (4.69%) GitLab
5 26 (4.69%) Selenium
6 24 (4.33%) JMeter
6 24 (4.33%) Robot Framework
7 16 (2.89%) Atlassian Bamboo
7 16 (2.89%) Bitbucket
8 15 (2.71%) Maven
9 9 (1.62%) Subversion
10 8 (1.44%) Sonatype Nexus
11 6 (1.08%) Gradle
12 4 (0.72%) Artifactory
13 3 (0.54%) CircleCI
13 3 (0.54%) GoCD
13 3 (0.54%) IntelliJ
14 2 (0.36%) Oracle APEX
General
1 129 (23.29%) Finance
2 70 (12.64%) Social Skills
3 32 (5.78%) Legal
4 30 (5.42%) Advertising
5 25 (4.51%) Telecoms
6 19 (3.43%) Analytical Skills
7 17 (3.07%) Banking
7 17 (3.07%) Public Sector
8 14 (2.53%) Marketing
8 14 (2.53%) Retail
9 9 (1.62%) Back Office
9 9 (1.62%) Law
10 7 (1.26%) Documentation Skills
10 7 (1.26%) Manufacturing
11 5 (0.90%) iGaming
12 4 (0.72%) Electronics
13 2 (0.36%) Games
13 2 (0.36%) International Banking
13 2 (0.36%) Local Government
14 1 (0.18%) Investment Banking
Job Titles
1 95 (17.15%) Linux Engineer
2 93 (16.79%) DevOps Engineer
3 62 (11.19%) Developer
4 60 (10.83%) Infrastructure Engineer
5 58 (10.47%) Software Engineer
6 54 (9.75%) Administrator
7 40 (7.22%) Senior Software Engineer
8 38 (6.86%) AWS Engineer
9 37 (6.68%) Cloud Engineer
10 32 (5.78%) Linux/Unix DevOps
11 31 (5.60%) DBA
12 30 (5.42%) Linux DevOps Engineer
13 29 (5.23%) Architect
14 26 (4.69%) AWS DevOps
14 26 (4.69%) Senior Linux Engineer
14 26 (4.69%) Systems Administrator
15 25 (4.51%) AWS DevOps Engineer
15 25 (4.51%) Linux Infrastructure Engineer
16 24 (4.33%) Java Developer
17 21 (3.79%) Consultant
Libraries, Frameworks & Software Standards
1 69 (12.45%) Elastic Stack
1 69 (12.45%) Kafka
2 62 (11.19%) LAMP
3 58 (10.47%) Apache NiFi
4 49 (8.84%) HTML
5 38 (6.86%) CSS
5 38 (6.86%) Node.js
6 37 (6.68%) Web Services
7 36 (6.50%) React
8 32 (5.78%) Twitter Bootstrap
9 31 (5.60%) LAPP Stack
10 27 (4.87%) HTML5
11 26 (4.69%) ActiveMQ
12 25 (4.51%) CSS3
12 25 (4.51%) Gherkin
12 25 (4.51%) Spring Boot
13 22 (3.97%) LEMP Stack
14 20 (3.61%) FIX Protocol
15 18 (3.25%) jQuery
15 18 (3.25%) RESTful
Miscellaneous
1 55 (9.93%) Cyberattack
1 55 (9.93%) Data Centre
2 33 (5.96%) Hybrid Cloud
3 31 (5.60%) User Experience
4 22 (3.97%) Public Cloud
5 20 (3.61%) Clustering
6 15 (2.71%) Eurex
7 13 (2.35%) Linux Command Line
8 9 (1.62%) PKI
9 8 (1.44%) Field-Programmable Gate Array
10 7 (1.26%) Greenfield Project
11 6 (1.08%) Derivative
11 6 (1.08%) Enterprise Software
11 6 (1.08%) Foreign Exchange (FX)
11 6 (1.08%) NHS
11 6 (1.08%) Video Conferencing
12 5 (0.90%) Client/Server
12 5 (0.90%) Cloud Native
12 5 (0.90%) Fixed Income
12 5 (0.90%) Private Cloud
Operating Systems
1 554 (100.00%) Linux
2 191 (34.48%) Red Hat Enterprise Linux
3 163 (29.42%) Windows
4 150 (27.08%) Ubuntu
5 103 (18.59%) Windows Server
6 72 (13.00%) Unix
7 55 (9.93%) Debian
8 49 (8.84%) Windows Server 2016
9 36 (6.50%) Windows Server 2019
10 29 (5.23%) Windows Server 2012
11 21 (3.79%) Fedora
12 19 (3.43%) Solaris
13 13 (2.35%) Windows 10
14 10 (1.81%) Amazon Linux
15 8 (1.44%) SUSE
16 5 (0.90%) CoreOS
17 4 (0.72%) Oracle Linux
18 3 (0.54%) Windows 2000 Server
18 3 (0.54%) Windows XP
19 2 (0.36%) VMS
Processes & Methodologies
1 226 (40.79%) DevOps
2 187 (33.75%) Agile Software Development
3 115 (20.76%) Software Engineering
4 92 (16.61%) Configuration Management
5 89 (16.06%) Scrum
6 87 (15.70%) Infrastructure Engineering
7 84 (15.16%) Mentoring
7 84 (15.16%) Open Source
8 83 (14.98%) Continuous Integration
9 77 (13.90%) Problem-Solving
10 69 (12.45%) Cybersecurity
10 69 (12.45%) ITIL
11 64 (11.55%) Site Reliability Engineering
12 63 (11.37%) Test Automation
13 57 (10.29%) High Availability
13 57 (10.29%) Infrastructure as Code
14 56 (10.11%) Microservices
15 55 (9.93%) Machine Learning
16 53 (9.57%) Migration
17 51 (9.21%) Disaster Recovery
Programming Languages
1 301 (54.33%) Python
2 185 (33.39%) Bash Shell
3 117 (21.12%) Java
4 103 (18.59%) PowerShell
5 87 (15.70%) JavaScript
6 84 (15.16%) SQL
7 74 (13.36%) C++
8 64 (11.55%) C
9 56 (10.11%) Perl
10 54 (9.75%) PHP
11 45 (8.12%) Go
11 45 (8.12%) Ruby
12 27 (4.87%) Shell Script
13 17 (3.07%) C#
14 11 (1.99%) PHP 7
15 10 (1.81%) Groovy
16 4 (0.72%) Kotlin
16 4 (0.72%) TypeScript
17 2 (0.36%) R
17 2 (0.36%) Rust
Qualifications
1 85 (15.34%) Security Cleared
2 58 (10.47%) SC Cleared
3 43 (7.76%) Degree
4 33 (5.96%) DV Cleared
5 27 (4.87%) RHCE
6 23 (4.15%) AWS Certification
7 21 (3.79%) CCNA
7 21 (3.79%) Cisco Certification
8 12 (2.17%) RHCSA
9 11 (1.99%) Microsoft Certification
10 9 (1.62%) CCENT
10 9 (1.62%) MCSA
11 3 (0.54%) Computer Science Degree
12 2 (0.36%) CompTIA Security+
12 2 (0.36%) DBS Check
12 2 (0.36%) HND
12 2 (0.36%) IISP
12 2 (0.36%) JNCIA
12 2 (0.36%) Master's Degree
12 2 (0.36%) OCP
Quality Assurance & Compliance
1 11 (1.99%) ISO/IEC 27001
2 10 (1.81%) QA
3 8 (1.44%) SLA
4 7 (1.26%) Cyber Essentials
5 5 (0.90%) Cyber Essentials PLUS
6 4 (0.72%) GDPR
7 3 (0.54%) NIST
7 3 (0.54%) PCI DSS
8 2 (0.36%) NCSC
8 2 (0.36%) Sarbanes-Oxley
9 1 (0.18%) Accessibility
System Software
1 181 (32.67%) Docker
2 114 (20.58%) VMware Infrastructure
3 90 (16.25%) Active Directory
4 38 (6.86%) vSphere
5 19 (3.43%) iptables
6 14 (2.53%) XenApp
6 14 (2.53%) XenDesktop
7 13 (2.35%) NFS
8 12 (2.17%) Hyper-V
9 10 (1.81%) Virtual Servers
10 9 (1.62%) KVM
10 9 (1.62%) VMware ESXi
11 8 (1.44%) Virtual Machines
12 7 (1.26%) Firmware
13 4 (0.72%) Postfix
14 2 (0.36%) Apache ZooKeeper
14 2 (0.36%) Oracle RAC
14 2 (0.36%) Sendmail
14 2 (0.36%) Varnish
14 2 (0.36%) Xen
Systems Management
1 238 (42.96%) Ansible
2 153 (27.62%) Puppet
3 107 (19.31%) Terraform
4 106 (19.13%) Kubernetes
5 46 (8.30%) Opscode Chef
6 31 (5.60%) Icinga
7 29 (5.23%) Prometheus
8 28 (5.05%) Docker Swarm
9 27 (4.87%) Nagios
10 24 (4.33%) HAProxy
11 23 (4.15%) Grafana
12 21 (3.79%) ZABBIX
13 19 (3.43%) SCCM
14 17 (3.07%) Packer
15 14 (2.53%) Failover Clustering
16 12 (2.17%) Consul
17 11 (1.99%) Salt
18 9 (1.62%) Graphite
19 6 (1.08%) Rundeck
20 5 (0.90%) logstash
Vendors
1 254 (45.85%) Red Hat
2 143 (25.81%) VMware
3 88 (15.88%) Microsoft
4 85 (15.34%) Oracle
5 48 (8.66%) Cisco
6 44 (7.94%) Google
7 40 (7.22%) Atlassian
8 20 (3.61%) F5
9 18 (3.25%) Brocade
10 17 (3.07%) SolarWinds
11 16 (2.89%) HP
12 15 (2.71%) New Relic
13 14 (2.53%) Bloomberg
13 14 (2.53%) CQG
13 14 (2.53%) Fidessa
13 14 (2.53%) ION Trading
13 14 (2.53%) Mellanox
13 14 (2.53%) Reuters
13 14 (2.53%) Solarflare
13 14 (2.53%) Trayport