Period
to 18 November 2017

The following table provides summary statistics for contract job vacancies advertised in the City of 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 18 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
Central London > City of London
6 months to
18 Nov 2017
Same period 2016 Same period 2015
Rank 223 204 246
Rank change year-on-year -19 +42 +23
Contract jobs citing CentOS 26 43 27
As % of all contract IT jobs advertised in the City of London 0.37% 0.64% 0.29%
As % of the Operating Systems category 1.82% 3.03% 1.32%
Number of daily rates quoted 25 32 24
City of London median daily rate £518 £469 £423
Median daily rate % change year-on-year +10.40% +10.95% -6.11%
10th Percentile £343 £351 £333
90th Percentile £575 £625 £514
Central London median daily rate £500 £475 £431
% change year-on-year +5.26% +10.14% -1.43%
Number of hourly rates quoted 0 0 0
City of London median hourly rate - - -
Central London median hourly rate - - -

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

All Operating Systems
City of London
Contract vacancies with a requirement for operating system skills 1426 1418 2053
As % of all contract IT jobs advertised in the City of London 20.14% 21.13% 22.20%
Number of daily rates quoted 1128 1118 1623
City of London median daily rate £475 £463 £430
Median daily rate % change year-on-year +2.70% +7.56% +7.37%
10th Percentile £225 £275 £225
90th Percentile £675 £625 £625
Central London median daily rate £475 £450 £425
% change year-on-year +5.56% +5.88% +6.25%
Number of hourly rates quoted 48 31 62
City of London median hourly rate £15.75 £19.00 £18.75
Median hourly rate % change year-on-year -17.11% +1.33% +10.29%
10th Percentile £11.25 £11.25 £12.04
90th Percentile £26.28 £33.75 £36.80
Central London median hourly rate £17.00 £17.50 £18.00
% change year-on-year -2.86% -2.78% +12.50%

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
Contractor Daily Rate Trend in the City of London

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

Contractor daily rate trend for CentOS in the City of London

CentOS
Contractor Daily Rate Histogram in the City of London

The daily rate distribution of IT jobs citing CentOS in the City of London over the 6 months to 18 November 2017.

Contractor daily rate histogram for CentOS in the City of London

For the 6 months to 18 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 City of London region with a requirement for CentOS.

1 26 (100.00%) Linux
2 17 (65.38%) Amazon AWS
2 17 (65.38%) DevOps
3 16 (61.54%) Python
4 14 (53.85%) Perl
5 12 (46.15%) Puppet
5 12 (46.15%) Terraform
6 11 (42.31%) Bash Shell
7 9 (34.62%) Ruby
7 9 (34.62%) Ubuntu
8 8 (30.77%) Finance
8 8 (30.77%) Red Hat
8 8 (30.77%) Ansible
9 7 (26.92%) Docker
9 7 (26.92%) Java
10 6 (23.08%) Configuration Management
10 6 (23.08%) Nagios
10 6 (23.08%) MySQL
11 5 (19.23%) Google
11 5 (19.23%) Degree
11 5 (19.23%) Computer Science
11 5 (19.23%) Release Management
11 5 (19.23%) Jetty
11 5 (19.23%) System Testing
11 5 (19.23%) Servlets
11 5 (19.23%) C
11 5 (19.23%) C++
11 5 (19.23%) Tomcat
11 5 (19.23%) Cisco
11 5 (19.23%) Shell Script

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 5 (19.23%) Jetty
1 5 (19.23%) nginx
1 5 (19.23%) Tomcat
2 1 (3.85%) Apache Solr
2 1 (3.85%) Apache Spark
2 1 (3.85%) Elasticsearch
2 1 (3.85%) OpenStack
Cloud Services
1 17 (65.38%) Amazon AWS
2 5 (19.23%) Cloud Computing
3 4 (15.38%) Google Cloud Platform
3 4 (15.38%) Google Compute Engine
3 4 (15.38%) IaaS
4 2 (7.69%) AWS CloudFormation
5 1 (3.85%) Amazon SQS
5 1 (3.85%) Microsoft Azure
Communications & Networking
1 4 (15.38%) DNS
1 4 (15.38%) TCP/IP
2 3 (11.54%) DHCP
2 3 (11.54%) NAS
2 3 (11.54%) SAN
2 3 (11.54%) SMTP
3 1 (3.85%) Cisco ASA
3 1 (3.85%) Cisco Nexus
3 1 (3.85%) Ethernet
3 1 (3.85%) VPN
Database & Business Intelligence
1 6 (23.08%) MySQL
2 5 (19.23%) Big Data
3 1 (3.85%) Apache Cassandra
3 1 (3.85%) Apache Hive
3 1 (3.85%) Hadoop
3 1 (3.85%) InfluxDB
3 1 (3.85%) MongoDB
3 1 (3.85%) PostgreSQL
Development Applications
1 4 (15.38%) Jenkins
2 1 (3.85%) JMeter
2 1 (3.85%) RSpec
2 1 (3.85%) Sonatype Nexus
2 1 (3.85%) TeamCity
General
1 8 (30.77%) Finance
2 3 (11.54%) Telecoms
Job Titles
1 13 (50.00%) DevOps Engineer
2 6 (23.08%) Linux Engineer
3 5 (19.23%) Administrator
3 5 (19.23%) Developer
3 5 (19.23%) Linux DevOps Engineer
3 5 (19.23%) Linux/Unix DevOps
3 5 (19.23%) Systems Administrator
4 4 (15.38%) AWS Engineer
4 4 (15.38%) C++ Developer
4 4 (15.38%) Systems Engineer
5 3 (11.54%) AWS DevOps
5 3 (11.54%) AWS DevOps Engineer
5 3 (11.54%) DevOps Administrator
5 3 (11.54%) DevOps Systems Engineer
5 3 (11.54%) Linux Administrator
5 3 (11.54%) Linux DevOps Administrator
5 3 (11.54%) Linux Systems Administrator
5 3 (11.54%) Linux Systems Engineer
5 3 (11.54%) Unix Support
6 2 (7.69%) Unix Analyst
Libraries, Frameworks & Software Standards
1 5 (19.23%) LEMP Stack
1 5 (19.23%) Servlets
2 4 (15.38%) Boost C++ Libraries
3 1 (3.85%) Elastic Stack
3 1 (3.85%) FIX Protocol
3 1 (3.85%) Node.js
3 1 (3.85%) Web Services
Miscellaneous
1 5 (19.23%) Analytical Skills
1 5 (19.23%) Computer Science
2 3 (11.54%) Greenfield Project
3 1 (3.85%) Enterprise Storage
3 1 (3.85%) Management Information System
3 1 (3.85%) Public Cloud
Operating Systems
1 26 (100.00%) Linux
2 9 (34.62%) Ubuntu
3 5 (19.23%) Red Hat Enterprise Linux
4 3 (11.54%) Solaris
4 3 (11.54%) Unix
4 3 (11.54%) Windows
5 1 (3.85%) Fedora
Processes & Methodologies
1 17 (65.38%) DevOps
2 6 (23.08%) Configuration Management
3 5 (19.23%) Low Latency
3 5 (19.23%) Patch Management
3 5 (19.23%) Release Management
3 5 (19.23%) System Testing
4 4 (15.38%) High-Frequency Trading
4 4 (15.38%) Immutable Infrastructure
4 4 (15.38%) SDLC
5 3 (11.54%) Agile Software Development
5 3 (11.54%) Analytics
5 3 (11.54%) Big Data Analytics
5 3 (11.54%) Continuous Integration
5 3 (11.54%) Data Analytics
6 2 (7.69%) Project Management
7 1 (3.85%) Benchmarking
7 1 (3.85%) Load Balancing
7 1 (3.85%) Load Testing
7 1 (3.85%) Open Source
7 1 (3.85%) Planning Poker
Programming Languages
1 16 (61.54%) Python
2 14 (53.85%) Perl
3 11 (42.31%) Bash Shell
4 9 (34.62%) Ruby
5 7 (26.92%) Java
6 5 (19.23%) C
6 5 (19.23%) C++
6 5 (19.23%) Shell Script
7 3 (11.54%) Korn
7 3 (11.54%) PowerShell
Qualifications
1 5 (19.23%) Degree
2 4 (15.38%) Computer Science Degree
3 3 (11.54%) Security Cleared
4 2 (7.69%) SC Cleared
System Software
1 7 (26.92%) Docker
2 3 (11.54%) Hyper-V
2 3 (11.54%) VMware Infrastructure
3 1 (3.85%) iptables
Systems Management
1 12 (46.15%) Puppet
1 12 (46.15%) Terraform
2 8 (30.77%) Ansible
3 6 (23.08%) Nagios
4 5 (19.23%) Kubernetes
4 5 (19.23%) Packer
5 4 (15.38%) Opscode Chef
5 4 (15.38%) Prometheus
6 3 (11.54%) Salt
7 2 (7.69%) IBM BigFix
7 2 (7.69%) TADDM
8 1 (3.85%) Cacti
8 1 (3.85%) Grafana
8 1 (3.85%) Icinga
8 1 (3.85%) Kibana
8 1 (3.85%) logstash
8 1 (3.85%) NetBackup
8 1 (3.85%) SELinux
Vendors
1 8 (30.77%) Red Hat
2 5 (19.23%) Cisco
2 5 (19.23%) Google
3 3 (11.54%) EMC
3 3 (11.54%) NetApp
3 3 (11.54%) VMware
4 2 (7.69%) IBM
4 2 (7.69%) ServiceNow
5 1 (3.85%) CommVault