Period
to 24 November 2017

The following table provides summary statistics for contract job vacancies advertised in London with a requirement for CentOS skills. Included is a benchmarking guide to the contractor rates 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.

Note that daily and hourly rates are treated separately in these statistics. When calculating contractor rate percentiles, daily rates are never derived from quoted hourly rates or vice versa.

CentOS Linux
England > London
6 months to
24 Nov 2017
Same period 2016 Same period 2015
Rank 326 239 315
Rank change year-on-year -87 +76 +39
Contract jobs citing CentOS 339 487 324
As % of all contract IT jobs advertised in London 0.72% 1.08% 0.69%
As % of the Operating Systems category 3.46% 5.20% 3.24%
Number of daily rates quoted 251 323 221
London median daily rate £500 £500 £450
Median daily rate % change year-on-year - +11.11% +4.35%
10th Percentile £330 £363 £330
90th Percentile £609 £601 £575
England median daily rate £455 £463 £425
% change year-on-year -1.62% +8.82% +6.25%
Number of hourly rates quoted 6 1 0
London median hourly rate £29.88 £16.00 -
Median hourly rate % change year-on-year +86.72% - -
England median hourly rate £32.88 £14.75 £38.00
% change year-on-year +122.88% -61.18% +102.67%

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

All Operating Systems
London
Contract vacancies with a requirement for operating system skills 9798 9360 10015
As % of all contract IT jobs advertised in London 20.80% 20.75% 21.33%
Number of daily rates quoted 6947 6469 6827
London median daily rate £475 £450 £425
Median daily rate % change year-on-year +5.56% +5.88% +6.25%
10th Percentile £202 £230 £205
90th Percentile £638 £600 £600
England median daily rate £425 £410 £400
% change year-on-year +3.66% +2.50% +6.67%
Number of hourly rates quoted 269 211 316
London median hourly rate £19.00 £18.00 £17.43
Median hourly rate % change year-on-year +5.56% +3.30% +8.91%
10th Percentile £12.00 £11.25 £11.25
90th Percentile £47.83 £48.38 £43.00
England median hourly rate £17.50 £16.50 £16.50
% change year-on-year +6.06% - +4.90%

CentOS
Job Vacancy Trend in London

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

Job vacancy trend for CentOS in London

CentOS
Contractor Daily Rate Trend in London

This chart provides the 3-month moving average for daily rates quoted in contract jobs citing CentOS in London.

Contractor daily rate trend for CentOS in London

CentOS
Contractor Daily Rate Histogram in London

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

Contractor daily rate histogram for CentOS in London

CentOS
Contractor Hourly Rate Trend in London

This chart provides the 3-month moving average for contractor hourly rates quoted in IT jobs citing CentOS in London.

Contractor hourly rate trend for CentOS in London

CentOS
Contractor Hourly Rate Histogram in London

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

Contractor hourly rate histogram for CentOS in London

CentOS
Contract Job Locations in London

The table below looks at the demand and provides a guide to the median contractor rates quoted in IT jobs citing CentOS within the London region over the 6 months to 24 November 2017. 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
Contract
IT Job Ads
Median
Daily Rate
Past 6 Months
Median Daily Rate
% Change
on Same Period
Last Year
Live
Job
Vacancies
South London -22 64 £460 -3.16% 3
Central London -13 32 £500 +5.26% 15
West London +3 25 £515 +3.00% 8
East London -3 11 £575 +7.98% 2
CentOS
England

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

1 339 (100.00%) Linux
2 210 (61.95%) DevOps
3 173 (51.03%) Red Hat Enterprise Linux
4 164 (48.38%) Amazon AWS
5 156 (46.02%) Bash Shell
6 147 (43.36%) Red Hat
7 136 (40.12%) Puppet
8 132 (38.94%) Jenkins
9 131 (38.64%) Python
10 122 (35.99%) Docker
11 116 (34.22%) VMware
12 111 (32.74%) Ubuntu
13 99 (29.20%) Agile Software Development
13 99 (29.20%) Java
14 94 (27.73%) Git (software)
15 89 (26.25%) Continuous Integration
16 88 (25.96%) Security Cleared
17 87 (25.66%) Ansible
18 83 (24.48%) Windows
19 68 (20.06%) Unix
19 68 (20.06%) Configuration Management
19 68 (20.06%) Kubernetes
20 65 (19.17%) SC Cleared
21 64 (18.88%) Maven
22 63 (18.58%) VMware Infrastructure
23 60 (17.70%) DNS
23 60 (17.70%) Terraform
24 59 (17.40%) Windows Server
24 59 (17.40%) Ruby
25 58 (17.11%) Opscode Chef

CentOS
Co-occurring IT Skills in 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 55 (16.22%) Tomcat
2 45 (13.27%) Elasticsearch
3 40 (11.80%) Apache
4 28 (8.26%) Confluence
5 22 (6.49%) nginx
6 15 (4.42%) OpenStack
7 14 (4.13%) Apache Spark
8 10 (2.95%) Apache Solr
9 9 (2.65%) Apache Pig
9 9 (2.65%) Jetty
10 8 (2.36%) JBoss
11 6 (1.77%) MS Exchange
12 4 (1.18%) Adobe Experience Manager
12 4 (1.18%) Drupal
12 4 (1.18%) IIS
12 4 (1.18%) WordPress
13 1 (0.29%) SAS
13 1 (0.29%) WebLogic
13 1 (0.29%) WebSphere
13 1 (0.29%) WebSphere Application Server
Applications
1 1 (0.29%) HipChat
1 1 (0.29%) Microsoft Excel
1 1 (0.29%) MS Visio
1 1 (0.29%) Stata
Cloud Services
1 164 (48.38%) Amazon AWS
2 36 (10.62%) Amazon EC2
3 25 (7.37%) Microsoft Azure
4 21 (6.19%) Virtual Private Cloud
5 19 (5.60%) Amazon S3
6 18 (5.31%) GitHub
7 15 (4.42%) AWS CloudFormation
8 9 (2.65%) Amazon CloudWatch
8 9 (2.65%) Office 365
9 8 (2.36%) Amazon ELB
9 8 (2.36%) IaaS
10 7 (2.06%) Cloud Computing
10 7 (2.06%) Google Cloud Platform
11 6 (1.77%) Amazon EMR
12 5 (1.47%) Route 53
13 4 (1.18%) AWS Lambda
13 4 (1.18%) Google Compute Engine
13 4 (1.18%) Serverless
14 3 (0.88%) Amazon SQS
15 2 (0.59%) CloudFront
Communications & Networking
1 60 (17.70%) DNS
2 52 (15.34%) Firewall
3 30 (8.85%) LDAP
3 30 (8.85%) VPN
4 25 (7.37%) SAN
5 24 (7.08%) DHCP
5 24 (7.08%) TCP/IP
6 22 (6.49%) HTTP
7 21 (6.19%) LAN
7 21 (6.19%) WAN
8 15 (4.42%) OpenLDAP
9 14 (4.13%) SMTP
10 11 (3.24%) SSH
10 11 (3.24%) VoIP
11 9 (2.65%) OpenVPN
12 8 (2.36%) Kerberos
13 7 (2.06%) IMAP
14 5 (1.47%) Ethernet
14 5 (1.47%) NAS
14 5 (1.47%) Network Security
Database & Business Intelligence
1 51 (15.04%) MySQL
2 44 (12.98%) PostgreSQL
3 43 (12.68%) MongoDB
4 28 (8.26%) NoSQL
5 22 (6.49%) Hadoop
6 21 (6.19%) Apache Cassandra
6 21 (6.19%) Big Data
7 16 (4.72%) Amazon RDS
8 14 (4.13%) Relational Database
9 13 (3.83%) Redis
10 10 (2.95%) Apache Hive
10 10 (2.95%) Riak
11 9 (2.65%) Data Mining
11 9 (2.65%) Data Warehouse
11 9 (2.65%) Impala
11 9 (2.65%) MarkLogic
12 8 (2.36%) Blockchain
13 4 (1.18%) DB2
13 4 (1.18%) RDBMS
13 4 (1.18%) SQL Server
Development Applications
1 132 (38.94%) Jenkins
2 94 (27.73%) Git (software)
3 64 (18.88%) Maven
4 39 (11.50%) JIRA
5 19 (5.60%) Sonatype Nexus
6 13 (3.83%) Bitbucket
7 12 (3.54%) JUnit
7 12 (3.54%) Vagrant
8 11 (3.24%) Atlassian Bamboo
9 10 (2.95%) GitLab
10 9 (2.65%) Ant
10 9 (2.65%) Liquibase
10 9 (2.65%) SonarQube
11 7 (2.06%) Gradle
11 7 (2.06%) TeamCity
12 6 (1.77%) Subversion
13 5 (1.47%) git-flow
14 4 (1.18%) Hudson
14 4 (1.18%) Mercurial
15 3 (0.88%) Gerrit
General
1 33 (9.73%) Finance
2 9 (2.65%) Games
2 9 (2.65%) Retail
3 6 (1.77%) Banking
4 5 (1.47%) Telecoms
5 2 (0.59%) Advertising
5 2 (0.59%) Publishing
6 1 (0.29%) Billing
6 1 (0.29%) Financial Institution
6 1 (0.29%) Front Office
6 1 (0.29%) International Banking
6 1 (0.29%) Marketing
6 1 (0.29%) Pharmaceutical
Job Titles
1 153 (45.13%) DevOps Engineer
2 66 (19.47%) Administrator
3 65 (19.17%) AWS DevOps
4 55 (16.22%) Linux Engineer
5 50 (14.75%) Linux/Unix DevOps
6 49 (14.45%) Linux Administrator
6 49 (14.45%) Systems Administrator
7 48 (14.16%) AWS Engineer
8 44 (12.98%) Linux DevOps Engineer
9 42 (12.39%) AWS DevOps Engineer
10 40 (11.80%) Linux Systems Administrator
11 33 (9.73%) Developer
12 22 (6.49%) Consultant
12 22 (6.49%) Windows Engineer
13 21 (6.19%) DevOps Consultant
14 20 (5.90%) AWS Consultant
14 20 (5.90%) Systems Engineer
15 18 (5.31%) Senior DevOps
16 17 (5.01%) Infrastructure Engineer
16 17 (5.01%) VMWare Administrator
Libraries, Frameworks & Software Standards
1 49 (14.45%) Web Services
2 30 (8.85%) Elastic Stack
3 28 (8.26%) ActiveMQ
4 23 (6.78%) MCollective
5 22 (6.49%) REST
6 15 (4.42%) LAMP
6 15 (4.42%) RESTful
7 14 (4.13%) Spring
8 13 (3.83%) Hibernate
8 13 (3.83%) Kafka
9 12 (3.54%) Natural Language Processing
9 12 (3.54%) SOAP
10 10 (2.95%) RabbitMQ
11 9 (2.65%) Boost C++ Libraries
11 9 (2.65%) JMS
11 9 (2.65%) JSON
11 9 (2.65%) LEMP Stack
11 9 (2.65%) Lucene
11 9 (2.65%) Sensu
12 8 (2.36%) Play Framework
Miscellaneous
1 34 (10.03%) Replication
2 28 (8.26%) Analytical Skills
3 26 (7.67%) Greenfield Project
4 23 (6.78%) Public Cloud
5 21 (6.19%) Linux Command Line
6 20 (5.90%) Clustering
6 20 (5.90%) Data Centre
6 20 (5.90%) Device Driver
7 17 (5.01%) Computer Science
8 9 (2.65%) Algorithms
8 9 (2.65%) Fintech
9 7 (2.06%) PKI
9 7 (2.06%) Spread Betting
10 5 (1.47%) Mobile App
11 4 (1.18%) Video on Demand
12 3 (0.88%) Enterprise Storage
12 3 (0.88%) Grid Computing
13 2 (0.59%) Derivative
13 2 (0.59%) NHS
13 2 (0.59%) Video\Live Streaming
Operating Systems
1 339 (100.00%) Linux
2 173 (51.03%) Red Hat Enterprise Linux
3 111 (32.74%) Ubuntu
4 83 (24.48%) Windows
5 68 (20.06%) Unix
6 59 (17.40%) Windows Server
7 32 (9.44%) Windows Server 2012
8 25 (7.37%) Windows Server 2003
9 8 (2.36%) Debian
10 7 (2.06%) SUSE
11 6 (1.77%) Solaris
12 5 (1.47%) Fedora
12 5 (1.47%) Windows Server 2008
13 4 (1.18%) Mac OS X
13 4 (1.18%) Scientific Linux
14 3 (0.88%) CoreOS
14 3 (0.88%) Windows 7
15 2 (0.59%) Data ONTAP
15 2 (0.59%) VyOS
15 2 (0.59%) Windows 10
Processes & Methodologies
1 210 (61.95%) DevOps
2 99 (29.20%) Agile Software Development
3 89 (26.25%) Continuous Integration
4 68 (20.06%) Configuration Management
5 56 (16.52%) Open Source
6 49 (14.45%) Scrum
7 36 (10.62%) Load Balancing
8 30 (8.85%) Mentoring
9 27 (7.96%) Migration
10 24 (7.08%) Immutable Infrastructure
11 20 (5.90%) Continuous Delivery
11 20 (5.90%) SDLC
12 18 (5.31%) Build Automation
12 18 (5.31%) Patch Management
13 17 (5.01%) High Availability
13 17 (5.01%) Network Monitoring
14 16 (4.72%) Dependency Injection
15 14 (4.13%) Analytics
15 14 (4.13%) Root Cause Analysis
15 14 (4.13%) Test Automation
Programming Languages
1 156 (46.02%) Bash Shell
2 131 (38.64%) Python
3 99 (29.20%) Java
4 59 (17.40%) Ruby
5 52 (15.34%) Perl
6 40 (11.80%) PowerShell
7 31 (9.14%) Shell Script
8 24 (7.08%) SQL
9 23 (6.78%) Groovy
10 20 (5.90%) Go
11 19 (5.60%) C++
12 18 (5.31%) C
13 15 (4.42%) JavaScript
14 12 (3.54%) C#
15 11 (3.24%) Scala
16 10 (2.95%) R
17 8 (2.36%) PHP
18 6 (1.77%) Korn
19 3 (0.88%) ES6
19 3 (0.88%) Fortran
Qualifications
1 88 (25.96%) Security Cleared
2 65 (19.17%) SC Cleared
3 26 (7.67%) Degree
4 11 (3.24%) Computer Science Degree
5 7 (2.06%) Cisco Certification
6 5 (1.47%) RHCE
7 4 (1.18%) CCNP
7 4 (1.18%) CCSE
7 4 (1.18%) CISA
7 4 (1.18%) CISMP
7 4 (1.18%) CISSP
7 4 (1.18%) Microsoft Certification
8 3 (0.88%) CCNA
8 3 (0.88%) JNCIS
8 3 (0.88%) RHCSA
9 2 (0.59%) DV Cleared
9 2 (0.59%) VCP5
9 2 (0.59%) VMware Certified Professional (VCP)
10 1 (0.29%) MCPD
10 1 (0.29%) MCSE
Quality Assurance & Compliance
1 16 (4.72%) QA
2 14 (4.13%) Disclosure Scotland
3 4 (1.18%) GDPR
4 3 (0.88%) ISO/IEC 27001
5 1 (0.29%) GCP
5 1 (0.29%) PMO
System Software
1 122 (35.99%) Docker
2 63 (18.58%) VMware Infrastructure
3 42 (12.39%) VMware ESXi
4 40 (11.80%) Hyper-V
5 24 (7.08%) Active Directory
6 19 (5.60%) Virtual Machines
7 14 (4.13%) KVM
8 11 (3.24%) Samba
8 11 (3.24%) vCloud
9 10 (2.95%) Squid
10 9 (2.65%) Postfix
11 8 (2.36%) NFS
12 5 (1.47%) iptables
13 4 (1.18%) HDFS
14 2 (0.59%) pfSense
14 2 (0.59%) VMware NSX
14 2 (0.59%) vSphere
14 2 (0.59%) Xen
14 2 (0.59%) XenServer
15 1 (0.29%) Snort
Systems Management
1 136 (40.12%) Puppet
2 87 (25.66%) Ansible
3 68 (20.06%) Kubernetes
4 60 (17.70%) Terraform
5 58 (17.11%) Opscode Chef
6 43 (12.68%) Nagios
7 36 (10.62%) logstash
8 31 (9.14%) ZABBIX
9 25 (7.37%) Prometheus
10 23 (6.78%) Grafana
10 23 (6.78%) WMI
11 22 (6.49%) Icinga
12 20 (5.90%) Galera Cluster
13 14 (4.13%) Kibana
13 14 (4.13%) Salt
14 12 (3.54%) yum
15 11 (3.24%) Docker Swarm
16 9 (2.65%) Hadoop YARN
16 9 (2.65%) Rancher
17 8 (2.36%) Rsyslog
Vendors
1 147 (43.36%) Red Hat
2 116 (34.22%) VMware
3 47 (13.86%) Cisco
4 42 (12.39%) Splunk
5 25 (7.37%) Juniper
6 24 (7.08%) SolarWinds
7 18 (5.31%) Atlassian
8 13 (3.83%) Microsoft
9 12 (3.54%) NetApp
10 11 (3.24%) Fortinet
10 11 (3.24%) Mitel
11 10 (2.95%) EMC
11 10 (2.95%) HP
12 9 (2.65%) IBM
12 9 (2.65%) Sonatype
13 7 (2.06%) Google
14 6 (1.77%) Extreme Networks
14 6 (1.77%) Oracle
15 5 (1.47%) CheckPoint
15 5 (1.47%) CommVault