Period
to 24 November 2017

The following table provides summary statistics for permanent job vacancies advertised in the City of London 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 24 November 2017 with a comparison to the same period in the previous 2 years.

CentOS Linux
Central London > City of London
6 months to
24 Nov 2017
Same period 2016 Same period 2015
Rank 241 309 325
Rank change year-on-year +68 +16 +42
Permanent jobs citing CentOS 86 44 99
As % of all permanent IT jobs advertised in the City of London 0.84% 0.38% 0.58%
As % of the Operating Systems category 3.64% 1.51% 2.27%
Number of salaries quoted 78 43 93
City of London median annual salary £70,000 £57,500 £55,000
Median salary % change year-on-year +21.74% +4.55% +22.22%
10th Percentile £40,575 £40,300 £36,500
90th Percentile £85,000 £66,000 £76,200
Central London median annual salary £67,500 £57,500 £55,000
% change year-on-year +17.39% +4.55% +22.22%

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 advertised in the City of London with a requirement for operating system skills.

All Operating Systems
City of London
Permanent vacancies with a requirement for operating system skills 2360 2905 4354
As % of all permanent IT jobs advertised in the City of London 23.10% 24.99% 25.51%
Number of salaries quoted 2137 2631 3772
City of London median annual salary £55,000 £55,000 £52,500
Median salary % change year-on-year - +4.76% +5.00%
10th Percentile £30,750 £31,000 £28,750
90th Percentile £85,000 £90,000 £82,500
Central London median annual salary £55,000 £55,000 £52,500
% change year-on-year - +4.76% +5.00%

CentOS
Job Vacancy Trend in the City of London

Job postings citing CentOS as a percentage of all IT jobs advertised in the City of London.

Job vacancy trend for CentOS in the City of London

CentOS
Salary Trend in the City of London

This chart provides the 3-month moving average for salaries quoted in permanent IT jobs citing CentOS in the City of London.

Salary trend for CentOS in the City of London

CentOS
Salary Histogram in the City of London

The salary distribution of IT jobs citing CentOS in the City of London over the 6 months to 24 November 2017.

Salary histogram for CentOS in the City of London

For the 6 months to 24 November 2017, IT jobs citing CentOS also mentioned the following skills in order of popularity. The figures indicate the number co-occurrences and its proportion to all job ads across the City of London region with a requirement for CentOS.

1 86 (100.00%) Linux
2 54 (62.79%) Red Hat
2 54 (62.79%) DevOps
3 44 (51.16%) Amazon AWS
4 40 (46.51%) Python
5 38 (44.19%) Java
6 36 (41.86%) Ubuntu
7 31 (36.05%) Puppet
8 30 (34.88%) Red Hat Enterprise Linux
9 28 (32.56%) Ansible
10 27 (31.40%) Bash Shell
10 27 (31.40%) Windows
11 22 (25.58%) Firewall
12 21 (24.42%) Ruby
13 20 (23.26%) Jenkins
14 19 (22.09%) TCP/IP
15 18 (20.93%) Unix
15 18 (20.93%) Perl
15 18 (20.93%) MySQL
15 18 (20.93%) Docker
16 17 (19.77%) Microsoft Azure
16 17 (19.77%) Terraform
16 17 (19.77%) Finance
17 16 (18.60%) VMware
18 14 (16.28%) nginx
18 14 (16.28%) Cisco
19 13 (15.12%) PHP
19 13 (15.12%) VMware Infrastructure
19 13 (15.12%) Agile Software Development
20 12 (13.95%) Cloud Computing

CentOS
Co-occurring IT Skills in the City of London 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 14 (16.28%) nginx
2 12 (13.95%) Tomcat
3 11 (12.79%) Apache
4 7 (8.14%) Jetty
5 6 (6.98%) Elasticsearch
6 5 (5.81%) Confluence
7 4 (4.65%) Apache Solr
8 3 (3.49%) Apache Spark
9 1 (1.16%) IIS
9 1 (1.16%) OpenStack
Business Applications
1 4 (4.65%) R3 Corda
Cloud Services
1 44 (51.16%) Amazon AWS
2 17 (19.77%) Microsoft Azure
3 12 (13.95%) Cloud Computing
4 11 (12.79%) AWS CloudFormation
5 8 (9.30%) Amazon EC2
5 8 (9.30%) Amazon S3
6 7 (8.14%) Virtual Private Cloud
7 6 (6.98%) AWS Lambda
7 6 (6.98%) Serverless
8 5 (5.81%) Datadog
8 5 (5.81%) Google Cloud Platform
9 4 (4.65%) Amazon CloudWatch
9 4 (4.65%) Amazon ElastiCache
9 4 (4.65%) Amazon Kinesis
9 4 (4.65%) Amazon SQS
9 4 (4.65%) GitHub
9 4 (4.65%) Rackspace Cloud
10 1 (1.16%) Azure Active Directory
10 1 (1.16%) IaaS
Communications & Networking
1 22 (25.58%) Firewall
2 19 (22.09%) TCP/IP
3 11 (12.79%) iSCSI
4 7 (8.14%) Cisco ASA
4 7 (8.14%) Network Security
4 7 (8.14%) VPN
5 6 (6.98%) Fibre Channel
5 6 (6.98%) HTTP
5 6 (6.98%) NetScaler
6 5 (5.81%) Cisco Wireless
6 5 (5.81%) HTTPS
6 5 (5.81%) IPsec
6 5 (5.81%) Wireless
7 4 (4.65%) DNS
7 4 (4.65%) SAN
8 2 (2.33%) Cisco Nexus
8 2 (2.33%) Internet
9 1 (1.16%) Kerberos
9 1 (1.16%) MRTG
Database & Business Intelligence
1 18 (20.93%) MySQL
2 10 (11.63%) Big Data
3 8 (9.30%) Amazon RDS
4 7 (8.14%) NoSQL
5 6 (6.98%) Amazon Redshift
6 5 (5.81%) PostgreSQL
6 5 (5.81%) Redis
7 4 (4.65%) Amazon DynamoDB
7 4 (4.65%) Blockchain
7 4 (4.65%) InterSystems Cache
7 4 (4.65%) MongoDB
8 2 (2.33%) Relational Database
Development Applications
1 20 (23.26%) Jenkins
2 6 (6.98%) JIRA
2 6 (6.98%) TeamCity
3 5 (5.81%) Git (software)
4 4 (4.65%) Artifactory
4 4 (4.65%) Sonatype Nexus
5 2 (2.33%) Ant
5 2 (2.33%) Atlassian Bamboo
5 2 (2.33%) Bitbucket
General
1 17 (19.77%) Finance
2 9 (10.47%) Banking
3 2 (2.33%) Financial Institution
3 2 (2.33%) Telecoms
Job Titles
1 43 (50.00%) DevOps Engineer
2 17 (19.77%) Linux Engineer
3 11 (12.79%) Administrator
3 11 (12.79%) Systems Administrator
4 10 (11.63%) Cloud Engineer
4 10 (11.63%) Linux/Unix DevOps
4 10 (11.63%) Senior DevOps
4 10 (11.63%) Senior DevOps Engineer
4 10 (11.63%) Unix Engineer
5 8 (9.30%) Operations Engineer
5 8 (9.30%) Systems Engineer
6 7 (8.14%) AIX Engineer
6 7 (8.14%) Solaris Engineer
7 6 (6.98%) IT Engineer
7 6 (6.98%) Senior Unix Engineer
8 5 (5.81%) AWS Engineer
8 5 (5.81%) Infrastructure Engineer
8 5 (5.81%) Linux Systems Engineer
9 4 (4.65%) DevOps Administrator
9 4 (4.65%) Linux DevOps Engineer
Libraries, Frameworks & Software Standards
1 10 (11.63%) LEMP Stack
2 7 (8.14%) Node.js
2 7 (8.14%) Servlets
3 6 (6.98%) FIX Protocol
4 4 (4.65%) RESTful
5 2 (2.33%) Elastic Stack
5 2 (2.33%) LAMP
5 2 (2.33%) Web Services
6 1 (1.16%) AngularJS
6 1 (1.16%) LAPP Stack
6 1 (1.16%) React
Miscellaneous
1 8 (9.30%) Data Centre
2 5 (5.81%) Linux Command Line
2 5 (5.81%) PKI
3 4 (4.65%) BBC
3 4 (4.65%) Digital TV
3 4 (4.65%) Enterprise Software
3 4 (4.65%) HP StoreVirtual
3 4 (4.65%) STB
4 2 (2.33%) Fintech
4 2 (2.33%) Hedge funds
4 2 (2.33%) Public Cloud
Operating Systems
1 86 (100.00%) Linux
2 36 (41.86%) Ubuntu
3 30 (34.88%) Red Hat Enterprise Linux
4 27 (31.40%) Windows
5 18 (20.93%) Unix
6 8 (9.30%) Windows Server 2008
7 7 (8.14%) AIX
7 7 (8.14%) Solaris
7 7 (8.14%) Windows Server
8 6 (6.98%) Debian
9 5 (5.81%) Kali Linux
10 2 (2.33%) Windows 10
10 2 (2.33%) Windows 7
11 1 (1.16%) FreeBSD
11 1 (1.16%) SUSE
Processes & Methodologies
1 54 (62.79%) DevOps
2 13 (15.12%) Agile Software Development
3 11 (12.79%) Configuration Management
3 11 (12.79%) Service Delivery
4 10 (11.63%) Open Source
5 9 (10.47%) Continuous Integration
6 8 (9.30%) Patch Management
7 7 (8.14%) Software Engineering
8 6 (6.98%) Change Control
8 6 (6.98%) Electronic Trading
8 6 (6.98%) Performance Tuning
9 5 (5.81%) Cryptography
9 5 (5.81%) High Availability
9 5 (5.81%) ITIL
9 5 (5.81%) Multi-Factor Authentication
9 5 (5.81%) Release Management
9 5 (5.81%) Security Operations
9 5 (5.81%) SIEM
9 5 (5.81%) Two-Factor Authentication
9 5 (5.81%) Vulnerability Management
Programming Languages
1 40 (46.51%) Python
2 38 (44.19%) Java
3 27 (31.40%) Bash Shell
4 21 (24.42%) Ruby
5 18 (20.93%) Perl
6 13 (15.12%) PHP
7 8 (9.30%) Go
7 8 (9.30%) Shell Script
8 7 (8.14%) SQL
9 5 (5.81%) Clojure
9 5 (5.81%) C-shell
9 5 (5.81%) Korn
10 2 (2.33%) PowerShell
11 1 (1.16%) C
11 1 (1.16%) C++
11 1 (1.16%) JavaScript
Qualifications
1 12 (13.95%) RHCE
2 9 (10.47%) Linux+ Certification
2 9 (10.47%) RHCSA
3 6 (6.98%) VMware Certified Professional (VCP)
4 5 (5.81%) CEH
4 5 (5.81%) CISSP
4 5 (5.81%) CREST Certified
4 5 (5.81%) GIAC
4 5 (5.81%) LPIC
4 5 (5.81%) RHCA
4 5 (5.81%) SANS
4 5 (5.81%) SC Cleared
4 5 (5.81%) Security Cleared
5 4 (4.65%) MCP
6 3 (3.49%) Degree
7 1 (1.16%) Microsoft Certification
Quality Assurance & Compliance
1 5 (5.81%) ISO/IEC 27001
1 5 (5.81%) PCI DSS
2 1 (1.16%) GCP
System Software
1 18 (20.93%) Docker
2 13 (15.12%) VMware Infrastructure
3 10 (11.63%) VMware ESXi
4 5 (5.81%) pfSense
5 4 (4.65%) Varnish
6 3 (3.49%) Active Directory
6 3 (3.49%) iptables
7 2 (2.33%) KVM
8 1 (1.16%) oVirt
8 1 (1.16%) Postfix
8 1 (1.16%) PowerDNS
8 1 (1.16%) Xen
Systems Management
1 31 (36.05%) Puppet
2 28 (32.56%) Ansible
3 17 (19.77%) Terraform
4 10 (11.63%) Nagios
5 7 (8.14%) Opscode Chef
6 6 (6.98%) SolarWinds Orion
7 5 (5.81%) FortiGate
7 5 (5.81%) Kubernetes
7 5 (5.81%) Packer
8 4 (4.65%) Backup Exec
8 4 (4.65%) HAProxy
8 4 (4.65%) Icinga
9 2 (2.33%) Red Hat Satellite
9 2 (2.33%) Red Hat Spacewalk
9 2 (2.33%) Salt
9 2 (2.33%) SELinux
10 1 (1.16%) Munin
Vendors
1 54 (62.79%) Red Hat
2 16 (18.60%) VMware
3 14 (16.28%) Cisco
4 11 (12.79%) HP
5 10 (11.63%) SolarWinds
6 8 (9.30%) Citrix
7 7 (8.14%) Microsoft
7 7 (8.14%) NetApp
8 6 (6.98%) Splunk
9 5 (5.81%) Aruba
9 5 (5.81%) CheckPoint
9 5 (5.81%) F5
9 5 (5.81%) Fortinet
9 5 (5.81%) Google
9 5 (5.81%) Juniper
9 5 (5.81%) New Relic
9 5 (5.81%) Palo Alto
9 5 (5.81%) Rackspace
9 5 (5.81%) SonicWALL
9 5 (5.81%) WatchGuard