Period
to 14 April 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 14 April 2021 with a comparison to the same period in the previous 2 years.

CentOS Linux
UK
6 months to
14 Apr 2021
Same period 2020 Same period 2019
Rank 404 483 423
Rank change year-on-year +79 -60 +24
Permanent jobs citing CentOS 581 614 1,068
As % of all permanent jobs advertised in the UK 0.70% 0.54% 0.72%
As % of the Operating Systems category 3.57% 2.54% 3.10%
Number of salaries quoted 427 491 903
10th Percentile £34,500 £31,250 £31,050
25th Percentile £42,500 £37,500 £37,625
Median annual salary (50th Percentile) £55,000 £55,000 £52,500
Median % change year-on-year - +4.76% +10.53%
75th Percentile £73,750 £65,000 £67,500
90th Percentile £81,250 £82,500 £80,000
UK excluding London median annual salary £49,000 £45,000 £45,000
% change year-on-year +8.89% - -

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 16,287 24,193 34,432
As % of all permanent IT jobs advertised in the UK 19.56% 21.39% 23.11%
Number of salaries quoted 13,189 19,726 27,788
10th Percentile £27,500 £26,250 £25,821
25th Percentile £36,250 £32,500 £32,500
Median annual salary (50th Percentile) £50,000 £47,500 £47,500
Median % change year-on-year +5.26% - +5.56%
75th Percentile £67,500 £65,000 £65,000
90th Percentile £82,500 £80,000 £78,750
UK excluding London median annual salary £45,000 £42,500 £42,000
% change year-on-year +5.88% +1.19% +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 14 April 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 14 April 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 +107 550 £55,000 - 103
UK excluding London +141 377 £49,000 +8.89% 73
London +33 176 £70,000 +16.67% 37
South West +61 153 £50,000 - 6
Work from Home -58 96 £55,000 - 23
South East +88 86 £45,000 -10.00% 26
North of England +40 57 £45,000 - 13
Midlands +48 47 £50,000 +11.11% 11
North West +49 39 £48,500 -7.62% 8
West Midlands +30 28 £50,000 -14.89% 5
East of England +67 20 £50,000 -9.09% 10
East Midlands +29 19 £47,500 +35.71% 6
Yorkshire -1 14 £43,250 -3.89% 1
Wales +34 6 £36,250 -23.68% 6
Northern Ireland +12 6 £52,500 - 1
North East +10 4 £32,250 +0.78% 4
Scotland -7 3 £35,000 -12.50%

For the 6 months to 14 April 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.

1 581 (100.00%) Linux
2 308 (53.01%) DevOps
3 273 (46.99%) AWS
4 257 (44.23%) Python
4 257 (44.23%) Ansible
5 252 (43.37%) Red Hat
6 242 (41.65%) Ubuntu
7 226 (38.90%) Docker
8 214 (36.83%) Puppet
9 212 (36.49%) Agile Software Development
10 207 (35.63%) VMware
11 198 (34.08%) Windows
12 191 (32.87%) Bash Shell
13 180 (30.98%) Red Hat Enterprise Linux
14 178 (30.64%) Git (software)
15 166 (28.57%) Azure
16 160 (27.54%) Configuration Management
17 157 (27.02%) Jenkins
18 154 (26.51%) Terraform
19 153 (26.33%) VMware Infrastructure
20 127 (21.86%) Kubernetes
21 124 (21.34%) Firewall
22 117 (20.14%) Microsoft
23 114 (19.62%) JIRA
24 108 (18.59%) Confluence
25 107 (18.42%) Windows Server
26 101 (17.38%) PowerShell
27 100 (17.21%) Open Source
28 99 (17.04%) Java
28 99 (17.04%) Infrastructure as Code

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
1 108 (18.59%) Confluence
2 70 (12.05%) Apache
3 41 (7.06%) nginx
4 40 (6.88%) Elasticsearch
5 34 (5.85%) IIS
6 24 (4.13%) Tomcat
7 11 (1.89%) Apache Solr
8 8 (1.38%) OpenStack
9 7 (1.20%) SharePoint
10 6 (1.03%) Apache Spark
10 6 (1.03%) GlassFish
11 5 (0.86%) Apache Pulsar
11 5 (0.86%) MS Exchange
12 4 (0.69%) JBoss
12 4 (0.69%) WordPress
13 3 (0.52%) Skype for Business
14 1 (0.17%) Ethereum
Applications
1 6 (1.03%) Photoshop
2 4 (0.69%) Microsoft Office
3 3 (0.52%) Adobe XD
3 3 (0.52%) Houdini
3 3 (0.52%) Maya
3 3 (0.52%) NUKE
Business Applications
1 14 (2.41%) Dynamics NAV
Cloud Services
1 273 (46.99%) AWS
2 166 (28.57%) Azure
3 53 (9.12%) GCP
4 39 (6.71%) Amazon EC2
5 33 (5.68%) GitHub
6 24 (4.13%) Cloud Computing
7 22 (3.79%) SaaS
8 21 (3.61%) Amazon EKS
8 21 (3.61%) Amazon S3
9 20 (3.44%) Amazon ECS
9 20 (3.44%) Microsoft 365
10 17 (2.93%) Azure Active Directory
10 17 (2.93%) Virtual Private Cloud
11 16 (2.75%) AWS CloudFormation
12 15 (2.58%) Route 53
13 13 (2.24%) Amazon ElastiCache
13 13 (2.24%) AWS Fargate
14 10 (1.72%) OpenShift
15 9 (1.55%) IaaS
16 8 (1.38%) Amazon CloudWatch
Communications & Networking
1 124 (21.34%) Firewall
2 79 (13.60%) DNS
3 55 (9.47%) IPv4
4 53 (9.12%) VPN
5 50 (8.61%) TCP/IP
6 45 (7.75%) VLAN
7 43 (7.40%) DHCP
8 33 (5.68%) HTTP
9 32 (5.51%) OSPF
10 30 (5.16%) SAN
11 28 (4.82%) WAN
12 23 (3.96%) LAN
13 16 (2.75%) FTP
14 15 (2.58%) Internet
15 13 (2.24%) VoIP
16 12 (2.07%) Intrusion Detection
16 12 (2.07%) Network Security
17 11 (1.89%) HTTPS
18 10 (1.72%) IPv6
18 10 (1.72%) SMTP
Database & Business Intelligence
1 79 (13.60%) PostgreSQL
2 75 (12.91%) MySQL
3 56 (9.64%) Big Data
4 55 (9.47%) SQL Server
5 34 (5.85%) MongoDB
6 29 (4.99%) NoSQL
7 23 (3.96%) Hadoop
8 21 (3.61%) MariaDB
8 21 (3.61%) Redis
9 20 (3.44%) Amazon RDS
10 14 (2.41%) SQL Server 2005
10 14 (2.41%) SQL Server 2008
10 14 (2.41%) SQL Server 2012
11 13 (2.24%) Apache Cassandra
11 13 (2.24%) Relational Database
12 6 (1.03%) Apache Accumulo
12 6 (1.03%) CouchDB
12 6 (1.03%) RDBMS
13 5 (0.86%) Impala
14 4 (0.69%) Amazon DynamoDB
Development Applications
1 178 (30.64%) Git (software)
2 157 (27.02%) Jenkins
3 114 (19.62%) JIRA
4 54 (9.29%) GitLab
5 47 (8.09%) Subversion
6 31 (5.34%) Atlassian Bamboo
6 31 (5.34%) TeamCity
7 22 (3.79%) Bitbucket
8 17 (2.93%) Travis CI
9 15 (2.58%) Artifactory
10 14 (2.41%) Octopus Deploy
11 10 (1.72%) GoCD
11 10 (1.72%) Maven
12 9 (1.55%) Gerrit
13 7 (1.20%) Sonatype Nexus
14 6 (1.03%) SonarQube
15 5 (0.86%) git-flow
15 5 (0.86%) Mockito
15 5 (0.86%) TestNG
15 5 (0.86%) WebStorm
General
1 67 (11.53%) Finance
2 56 (9.64%) Public Sector
3 36 (6.20%) Legal
4 33 (5.68%) Marketing
5 27 (4.65%) Telecoms
6 17 (2.93%) Electronics
6 17 (2.93%) Manufacturing
7 12 (2.07%) Banking
8 9 (1.55%) Law
9 7 (1.20%) Games
10 5 (0.86%) Publishing
11 4 (0.69%) Back Office
12 3 (0.52%) Advertising
13 2 (0.34%) Aerospace
13 2 (0.34%) iGaming
13 2 (0.34%) Retail
14 1 (0.17%) Front Office
14 1 (0.17%) Investment Banking
14 1 (0.17%) Retail Banking
Job Titles
1 171 (29.43%) DevOps Engineer
2 114 (19.62%) Linux Engineer
3 76 (13.08%) Infrastructure Engineer
4 53 (9.12%) Senior DevOps
5 48 (8.26%) Senior DevOps Engineer
6 45 (7.75%) Administrator
7 41 (7.06%) Developer
8 39 (6.71%) Systems Administrator
9 36 (6.20%) Software Engineer
10 35 (6.02%) Cloud Engineer
11 31 (5.34%) Linux Systems Engineer
11 31 (5.34%) Linux/Unix DevOps
11 31 (5.34%) Systems Engineer
12 29 (4.99%) Linux DevOps Engineer
13 28 (4.82%) AWS Engineer
13 28 (4.82%) Platform Engineer
14 27 (4.65%) Linux Administrator
15 25 (4.30%) Linux Systems Administrator
16 22 (3.79%) Senior Infrastructure Engineer
16 22 (3.79%) Senior Software Engineer
Libraries, Frameworks & Software Standards
1 77 (13.25%) Web Services
2 61 (10.50%) Elastic Stack
3 51 (8.78%) Kafka
4 42 (7.23%) Apache NiFi
5 40 (6.88%) LAMP
6 28 (4.82%) HTML
7 26 (4.48%) LEMP Stack
8 25 (4.30%) CSS
9 21 (3.61%) .NET
10 17 (2.93%) LAPP Stack
11 16 (2.75%) Middleware
11 16 (2.75%) RabbitMQ
12 14 (2.41%) ASP.NET
13 13 (2.24%) LDAP
13 13 (2.24%) Node.js
14 12 (2.07%) jQuery
14 12 (2.07%) Laravel
14 12 (2.07%) Spring
14 12 (2.07%) YAML
15 11 (1.89%) Twitter Bootstrap
Miscellaneous
1 39 (6.71%) Public Cloud
2 32 (5.51%) Cyberattack
3 31 (5.34%) Data Centre
4 29 (4.99%) Hybrid Cloud
4 29 (4.99%) Linux Command Line
5 18 (3.10%) Clustering
6 10 (1.72%) Virtual Team
7 9 (1.55%) Analytical Skills
8 8 (1.38%) Eurex
9 7 (1.20%) Enterprise Software
9 7 (1.20%) Management Information System
9 7 (1.20%) Media Streaming
9 7 (1.20%) PKI
9 7 (1.20%) Replication
10 5 (0.86%) Algorithms
10 5 (0.86%) Distributed Denial-of-Service
11 4 (0.69%) Cybercrime
12 3 (0.52%) Enterprise Storage
12 3 (0.52%) PMI
12 3 (0.52%) Private Cloud
Operating Systems
1 581 (100.00%) Linux
2 242 (41.65%) Ubuntu
3 198 (34.08%) Windows
4 180 (30.98%) Red Hat Enterprise Linux
5 107 (18.42%) Windows Server
6 60 (10.33%) Unix
7 59 (10.15%) Windows Server 2016
8 52 (8.95%) Debian
9 24 (4.13%) Fedora
10 16 (2.75%) AIX
11 12 (2.07%) Windows Server 2012
12 11 (1.89%) Amazon Linux
12 11 (1.89%) Windows 10
13 10 (1.72%) Windows Server 2008
14 8 (1.38%) Solaris
14 8 (1.38%) Windows 7
15 5 (0.86%) Mac OS
15 5 (0.86%) Oracle Linux
15 5 (0.86%) VMS
16 3 (0.52%) SUSE
Processes & Methodologies
1 308 (53.01%) DevOps
2 212 (36.49%) Agile Software Development
3 160 (27.54%) Configuration Management
4 100 (17.21%) Open Source
5 99 (17.04%) Infrastructure as Code
6 95 (16.35%) Scrum
7 93 (16.01%) Site Reliability Engineering
8 91 (15.66%) Infrastructure Engineering
9 85 (14.63%) Machine Learning
10 83 (14.29%) Data Science
10 83 (14.29%) DevSecOps
11 82 (14.11%) Continuous Integration
12 80 (13.77%) Scaled Agile Framework
13 79 (13.60%) Cyber Intelligence
14 75 (12.91%) Microservices
15 73 (12.56%) Software Engineering
16 64 (11.02%) Task Automation
17 63 (10.84%) ITIL
18 62 (10.67%) Continuous Delivery
19 52 (8.95%) Service Management
Programming Languages
1 257 (44.23%) Python
2 191 (32.87%) Bash Shell
3 101 (17.38%) PowerShell
4 99 (17.04%) Java
5 82 (14.11%) Ruby
6 78 (13.43%) SQL
7 63 (10.84%) Perl
8 57 (9.81%) Shell Script
9 47 (8.09%) C
10 40 (6.88%) PHP
11 34 (5.85%) JavaScript
12 32 (5.51%) C++
13 23 (3.96%) C#
14 21 (3.61%) Go
15 20 (3.44%) Groovy
16 9 (1.55%) PL/SQL
17 8 (1.38%) PHP 5
18 7 (1.20%) Java 8
18 7 (1.20%) Lua
19 3 (0.52%) TypeScript
Qualifications
1 83 (14.29%) Security Cleared
2 63 (10.84%) SC Cleared
3 45 (7.75%) Degree
4 29 (4.99%) AWS Certification
5 18 (3.10%) RHCE
6 14 (2.41%) RHCSA
7 13 (2.24%) Computer Science Degree
8 10 (1.72%) DV Cleared
9 9 (1.55%) CCNA
9 9 (1.55%) Cisco Certification
10 3 (0.52%) Microsoft Certification
10 3 (0.52%) PMI Certification
11 2 (0.34%) CISSP
11 2 (0.34%) CompTIA Security+
11 2 (0.34%) GIAC
11 2 (0.34%) Linux+ Certification
11 2 (0.34%) MCSE
11 2 (0.34%) Network+ Certification
11 2 (0.34%) SANS
11 2 (0.34%) SSCP
Quality Assurance & Compliance
1 19 (3.27%) QA
2 11 (1.89%) PCI DSS
3 8 (1.38%) SLA
4 6 (1.03%) OpenSCAP
5 3 (0.52%) WCAG
6 2 (0.34%) ISO/IEC 27001
7 1 (0.17%) HMG Security Policy Framework
System Software
1 226 (38.90%) Docker
2 153 (26.33%) VMware Infrastructure
3 75 (12.91%) Active Directory
4 56 (9.64%) VMware ESXi
5 42 (7.23%) vSphere
6 32 (5.51%) Hyper-V
7 21 (3.61%) KVM
8 15 (2.58%) Samba
9 14 (2.41%) NFS
9 14 (2.41%) Xen
10 8 (1.38%) Apache ZooKeeper
11 7 (1.20%) Kamailio
11 7 (1.20%) OpenSIPS
11 7 (1.20%) Postfix
12 6 (1.03%) Ceph
12 6 (1.03%) iptables
12 6 (1.03%) Slurm Workload Manager
12 6 (1.03%) StorNext
12 6 (1.03%) VirtualBox
12 6 (1.03%) Xsan
Systems Management
1 257 (44.23%) Ansible
2 214 (36.83%) Puppet
3 154 (26.51%) Terraform
4 127 (21.86%) Kubernetes
5 47 (8.09%) Grafana
6 46 (7.92%) Prometheus
7 36 (6.20%) Opscode Chef
8 35 (6.02%) Nagios
9 34 (5.85%) Docker Swarm
10 32 (5.51%) Graphite
11 21 (3.61%) HAProxy
11 21 (3.61%) Packer
11 21 (3.61%) ZABBIX
12 18 (3.10%) Consul
13 14 (2.41%) Icinga
14 11 (1.89%) Red Hat Satellite
15 10 (1.72%) Oracle ZFS
16 9 (1.55%) Systems Management Server (SMS)
17 7 (1.20%) Galera Cluster
17 7 (1.20%) Kibana
Vendors
1 252 (43.37%) Red Hat
2 207 (35.63%) VMware
3 117 (20.14%) Microsoft
4 40 (6.88%) Cisco
5 38 (6.54%) Oracle
6 34 (5.85%) Google
7 28 (4.82%) Atlassian
8 20 (3.44%) Dell
9 19 (3.27%) HP
9 19 (3.27%) Splunk
10 18 (3.10%) Juniper
11 17 (2.93%) SAP
12 12 (2.07%) EMC
12 12 (2.07%) NetApp
13 11 (1.89%) Cloudera
14 10 (1.72%) Isilon
14 10 (1.72%) Veeam
15 9 (1.55%) Citrix
15 9 (1.55%) ServiceNow
15 9 (1.55%) Supermicro