CentOS Contracts

The following table provides summary statistics for contract job vacancies with a requirement for CentOS skills. Included is a benchmarking guide to the contractor rates offered in vacancies that have cited CentOS over the 3 months to 25 June 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 UK
Location	3 months to 25 Jun 2017	Same period 2016	Same period 2015
Rank	282	370	412
Rank change year-on-year	+88	+42
Contract jobs citing CentOS	362	308	234
As % of all contract IT jobs advertised in the UK	0.78%	0.58%	0.42%
As % of the Operating Systems category	3.75%	2.50%	1.89%
Number of daily rates quoted	260	229	146
Median daily rate	£500	£465	£400
Median daily rate % change year-on-year	+7.52%	+16.25%
90% offered a daily rate of more than	£360	£323	£245
10% offered a daily rate of more than	£600	£560	£500
UK excluding London median daily rate	£460	£425	£375
% change year-on-year	+8.23%	+13.33%
Number of hourly rates quoted	6	2	0
Median hourly rate	£47.50	£55.00	-
Median hourly rate % change year-on-year	-13.63%	-
UK excluding London median hourly rate	£47.50	£55.00	-
% change year-on-year	-13.63%	-

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

Contract Operating System Skills UK
Contract job vacancies with a requirement for operating system skills	9652	12296	12385
As % of all contract IT job vacancies advertised in the UK	20.85%	23.17%	22.10%
Number of daily rates quoted	6011	7745	7227
Median daily rate	£403	£395	£350
Median daily rate % change year-on-year	+1.89%	+12.85%
90% offered a daily rate of more than	£175	£200	£173
10% offered a daily rate of more than	£550	£550	£525
UK excluding London median daily rate	£375	£363	£345
% change year-on-year	+3.44%	+5.07%
Number of hourly rates quoted	545	645	978
Median hourly rate	£16.00	£16.97	£17.00
Median hourly rate % change year-on-year	-5.71%	-0.17%
90% offered a hourly rate of more than	£11.00	£11.50	£11.00
10% offered a hourly rate of more than	£47.50	£42.00	£40.00
UK excluding London median hourly rate	£15.50	£17.00	£16.20
% change year-on-year	-8.82%	+4.93%

CentOS
Job Vacancy Trend

The job posting trend of jobs advertised citing CentOS as a proportion of all contract or permanent IT jobs with a match in the Operating Systems category.

CentOS
Contractor Daily Rate Trend

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

Contractor daily rate trend for CentOS in the UK

CentOS
Contractor Daily Rate Histogram

The daily rate distribution of IT jobs citing CentOS over the 3 months to 25 June 2017.

Contractor daily rate histogram for CentOS in the UK

CentOS
Contractor Hourly Rate Trend

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

Contractor hourly rate trend for CentOS in the UK

CentOS
Top 30 Contract Locations

The table below looks at the demand and provides a guide to the median contractor rates quoted in IT jobs citing CentOS within the UK over the 3 months to 25 June 2017. The 'Rank Change' column provides an indication of the change in demand within each location based on the same 3 month period last year.

Location	Rank Change on Same Period Last Year	Matching Contract IT Job Ads	Median Daily Rate Last 3 Months	Median Daily Rate % Change on Same Period Last Year	Live Job Vacancies
England	+81	358	£500	+7.81%	106
London	+27	191	£515	+3.00%	34
South East	+68	83	£500	+17.64%	27
Croydon	+16	27	£456	-6.88%
South West	+23	25	£425	-19.04%	14
Berkshire	+34	21	£550	+22.22%	11
West Midlands	+28	20	£460	+15.00%	2
Hampshire	-2	18	£500	+42.85%	6
North West	+27	16	£425	-	9
Surrey	+12	16	£525	+23.52%	6
City of London	+8	16	£475	-	6
Hammersmith	-	12	£555	-
Manchester	+21	11	£438	-12.50%	5
Milton Keynes	-3	11	£325	-38.09%
Buckinghamshire	-7	11	£325	-35.00%
Somerset	-	10	£588	-	1
Yorkshire	+8	9	£404	-10.27%	7
East of England	-4	9	£450	+5.88%	10
West Yorkshire	+11	8	£404	-12.70%	5
Slough	+11	8	£550	+15.78%	2
Oxfordshire	-2	8	£450	+12.50%	1
Bristol	-	8	£370	-	4
Shropshire	-	8	£496	-
Oxford	-	8	£450	-
Cambridge	+7	7	£213	-48.48%	4
Leeds	+7	7	£388	-16.21%	5
Cambridgeshire	+5	7	£213	-55.26%	4
Windsor	+3	7	£575	+10.57%
West Sussex	-	7	£383	-	2
Telford	-	6	£496	-

CentOS
Top 30 Co-occurring IT Skills

For the 6 months to 25 June 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 with a requirement for CentOS.

1	653 (100.00%)	Linux
2	360 (55.13%)	DevOps
3	301 (46.09%)	Red Hat Enterprise Linux
4	299 (45.79%)	Red Hat
5	295 (45.18%)	Python
6	273 (41.81%)	Puppet
7	252 (38.59%)	Ansible
8	250 (38.28%)	Bash Shell
9	243 (37.21%)	Amazon AWS
10	227 (34.76%)	Docker
11	218 (33.38%)	VMware
12	213 (32.62%)	Java
13	190 (29.10%)	Security Cleared
13	190 (29.10%)	Jenkins
14	187 (28.64%)	Git (software)

15	183 (28.02%)	Configuration Management
16	182 (27.87%)	Ubuntu
17	172 (26.34%)	SC Cleared
18	164 (25.11%)	Ruby
18	164 (25.11%)	Windows
19	134 (20.52%)	Agile Software Development
20	132 (20.21%)	VMware Infrastructure
21	120 (18.38%)	Perl
22	118 (18.07%)	DNS
23	114 (17.46%)	MySQL
23	114 (17.46%)	Terraform
24	109 (16.69%)	Opscode Chef
25	107 (16.39%)	Continuous Integration
26	100 (15.31%)	Unix
27	96 (14.70%)	Elastic Stack

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
Applications
Business Applications
Cloud Services
Communications & Networking
Database & Business Intelligence
Development Applications
General
Job Titles
Libraries, Frameworks & Software Standards
Miscellaneous
Operating Systems
Processes & Methodologies
Programming Languages
Qualifications
Quality Assurance & Compliance
System Software
Systems Management
Vendors

Application Platforms
1	74 (11.33%)	Tomcat
2	73 (11.18%)	Confluence
3	72 (11.03%)	Apache
4	70 (10.72%)	Elasticsearch
5	50 (7.66%)	OpenStack
6	30 (4.59%)	nginx
7	16 (2.45%)	MS Exchange
8	14 (2.14%)	Jetty
9	11 (1.68%)	JBoss
10	10 (1.53%)	IIS
10	10 (1.53%)	SharePoint
11	8 (1.23%)	Apache Spark
11	8 (1.23%)	Exchange Server 2010
11	8 (1.23%)	SharePoint 2013
11	8 (1.23%)	WebSphere
11	8 (1.23%)	WildFly
12	6 (0.92%)	ArcGIS
12	6 (0.92%)	Exchange Server 2013
12	6 (0.92%)	SAS
12	6 (0.92%)	SharePoint 2010

Applications
1	9 (1.38%)	Microsoft Office
2	3 (0.46%)	Microsoft Excel
3	1 (0.15%)	HipChat
3	1 (0.15%)	MS Visio
3	1 (0.15%)	Stata

Business Applications
1	7 (1.07%)	SAP Oil and Gas

Cloud Services
1	243 (37.21%)	Amazon AWS
2	69 (10.57%)	Microsoft Azure
3	48 (7.35%)	AWS CloudFormation
4	34 (5.21%)	GitHub
5	29 (4.44%)	Amazon S3
5	29 (4.44%)	AWS Lambda
6	26 (3.98%)	Amazon EC2
7	22 (3.37%)	Amazon CloudWatch
8	18 (2.76%)	Virtual Private Cloud
9	16 (2.45%)	Amazon ELB
10	15 (2.30%)	Cloud Computing
11	13 (1.99%)	IaaS
11	13 (1.99%)	Office 365
12	11 (1.68%)	SaaS
13	7 (1.07%)	Route 53
14	6 (0.92%)	Akamai
14	6 (0.92%)	Datadog
15	5 (0.77%)	Google Cloud Platform
16	4 (0.61%)	Bluemix
16	4 (0.61%)	IBM Cloud

Communications & Networking
1	118 (18.07%)	DNS
2	81 (12.40%)	TCP/IP
3	79 (12.10%)	HTTP
4	77 (11.79%)	Firewall
5	75 (11.49%)	LDAP
6	48 (7.35%)	SSL
7	36 (5.51%)	SAN
8	35 (5.36%)	DHCP
8	35 (5.36%)	SSH
9	31 (4.75%)	VPN
10	29 (4.44%)	SMTP
11	21 (3.22%)	LAN
12	20 (3.06%)	OpenLDAP
12	20 (3.06%)	WAN
13	18 (2.76%)	Internet
13	18 (2.76%)	NAS
14	17 (2.60%)	HTTPS
15	15 (2.30%)	Kerberos
16	14 (2.14%)	Network Security
17	13 (1.99%)	OpenVPN

Database & Business Intelligence
1	114 (17.46%)	MySQL
2	91 (13.94%)	PostgreSQL
3	62 (9.49%)	MongoDB
4	53 (8.12%)	Hadoop
5	41 (6.28%)	NoSQL
6	39 (5.97%)	Apache Cassandra
6	39 (5.97%)	Big Data
7	35 (5.36%)	SQL Server
8	23 (3.52%)	Amazon DynamoDB
9	21 (3.22%)	Relational Database
10	17 (2.60%)	Apache Hive
11	16 (2.45%)	MariaDB
11	16 (2.45%)	Redis
12	15 (2.30%)	Amazon RDS
13	12 (1.84%)	SQL Server 2012
14	9 (1.38%)	Oracle Database
15	8 (1.23%)	SQL Server 2008
16	7 (1.07%)	GIS
16	7 (1.07%)	Impala
17	5 (0.77%)	HBase

Development Applications
1	190 (29.10%)	Jenkins
2	187 (28.64%)	Git (software)
3	82 (12.56%)	Maven
4	74 (11.33%)	JIRA
5	36 (5.51%)	Sonatype Nexus
5	36 (5.51%)	Vagrant
6	25 (3.83%)	Bitbucket
7	23 (3.52%)	Ant
8	22 (3.37%)	Team Foundation Server
9	19 (2.91%)	GitLab
9	19 (2.91%)	JUnit
10	16 (2.45%)	Subversion
11	14 (2.14%)	Gradle
11	14 (2.14%)	TeamCity
12	12 (1.84%)	Liquibase
12	12 (1.84%)	SonarQube
13	9 (1.38%)	Atlassian Bamboo
14	8 (1.23%)	Artifactory
14	8 (1.23%)	Selenium
15	7 (1.07%)	Hudson

General
1	43 (6.58%)	Finance
2	30 (4.59%)	Telecoms
3	17 (2.60%)	Law
4	7 (1.07%)	Electronics
4	7 (1.07%)	Manufacturing
4	7 (1.07%)	Marketing
5	6 (0.92%)	Banking
6	2 (0.31%)	Back Office
7	1 (0.15%)	Aerospace
7	1 (0.15%)	Games
7	1 (0.15%)	Investment Banking
7	1 (0.15%)	Pharmaceutical
7	1 (0.15%)	Retail

Job Titles
1	242 (37.06%)	DevOps Engineer
2	115 (17.61%)	Linux Engineer
3	107 (16.39%)	Administrator
4	96 (14.70%)	Linux/Unix DevOps
5	82 (12.56%)	AWS DevOps
6	79 (12.10%)	Linux Administrator
7	76 (11.64%)	Systems Administrator
8	72 (11.03%)	AWS Engineer
9	69 (10.57%)	Linux DevOps Engineer
10	67 (10.26%)	Linux Systems Administrator
11	66 (10.11%)	AWS DevOps Engineer
12	55 (8.42%)	Developer
13	43 (6.58%)	Consultant
14	37 (5.67%)	Senior DevOps
15	33 (5.05%)	DBA
16	31 (4.75%)	Systems Engineer
17	30 (4.59%)	Architect
18	28 (4.29%)	Senior DevOps Engineer
19	27 (4.13%)	DevOps Consultant
19	27 (4.13%)	Java Engineer

Libraries, Frameworks & Software Standards
1	96 (14.70%)	Elastic Stack
2	52 (7.96%)	Web Services
3	47 (7.20%)	Sensu
4	45 (6.89%)	REST
5	40 (6.13%)	LAMP
6	27 (4.13%)	Kafka
7	24 (3.68%)	HTML
8	23 (3.52%)	ActiveMQ
8	23 (3.52%)	XML
9	21 (3.22%)	JSON
9	21 (3.22%)	MCollective
10	20 (3.06%)	CSS
11	18 (2.76%)	XSLT
12	17 (2.60%)	RESTful
13	16 (2.45%)	RabbitMQ
13	16 (2.45%)	RSS
14	13 (1.99%)	PostGIS
14	13 (1.99%)	SOAP
15	12 (1.84%)	Hibernate
15	12 (1.84%)	Spring

Miscellaneous
1	45 (6.89%)	Linux Command Line
2	38 (5.82%)	Computer Science
2	38 (5.82%)	Public Cloud
3	34 (5.21%)	Data Centre
4	29 (4.44%)	Clustering
5	25 (3.83%)	Analytical Skills
6	22 (3.37%)	Greenfield Project
7	21 (3.22%)	PKI
7	21 (3.22%)	Replication
8	18 (2.76%)	Video on Demand
9	17 (2.60%)	Management Information System
10	16 (2.45%)	Web 2.0
11	12 (1.84%)	Private Cloud
12	11 (1.68%)	Enterprise Storage
13	6 (0.92%)	Derivative
13	6 (0.92%)	Spread Betting
14	5 (0.77%)	CMDB
14	5 (0.77%)	Device Driver
14	5 (0.77%)	EMC VNX
14	5 (0.77%)	RIA

Operating Systems
1	653 (100.00%)	Linux
2	301 (46.09%)	Red Hat Enterprise Linux
3	182 (27.87%)	Ubuntu
4	164 (25.11%)	Windows
5	100 (15.31%)	Unix
6	73 (11.18%)	Windows Server
7	46 (7.04%)	Debian
8	32 (4.90%)	Windows Server 2012
9	29 (4.44%)	Solaris
10	28 (4.29%)	SUSE
10	28 (4.29%)	Windows Server 2008
11	24 (3.68%)	Fedora
12	15 (2.30%)	Windows Server 2003
13	6 (0.92%)	Data ONTAP
13	6 (0.92%)	Oracle Linux
14	5 (0.77%)	AIX
15	3 (0.46%)	CoreOS
15	3 (0.46%)	Windows 10
15	3 (0.46%)	Windows 7
16	2 (0.31%)	Apple iOS

Processes & Methodologies
1	360 (55.13%)	DevOps
2	183 (28.02%)	Configuration Management
3	134 (20.52%)	Agile Software Development
4	107 (16.39%)	Continuous Integration
5	64 (9.80%)	ITIL
6	62 (9.49%)	Open Source
7	57 (8.73%)	Continuous Delivery
8	55 (8.42%)	Scrum
9	49 (7.50%)	Service Management
10	43 (6.58%)	Load Balancing
11	36 (5.51%)	OOP
12	35 (5.36%)	OO
13	34 (5.21%)	Test Automation
14	32 (4.90%)	Performance Tuning
15	30 (4.59%)	Analytics
15	30 (4.59%)	High Availability
15	30 (4.59%)	Migration
16	29 (4.44%)	Continuous Deployment
16	29 (4.44%)	Project Management
17	24 (3.68%)	Kanban

Programming Languages
1	295 (45.18%)	Python
2	250 (38.28%)	Bash Shell
3	213 (32.62%)	Java
4	164 (25.11%)	Ruby
5	120 (18.38%)	Perl
6	58 (8.88%)	PHP
7	50 (7.66%)	SQL
8	49 (7.50%)	JavaScript
9	48 (7.35%)	Shell Script
10	39 (5.97%)	C
11	31 (4.75%)	PowerShell
12	29 (4.44%)	Groovy
13	21 (3.22%)	C#
14	20 (3.06%)	Korn
15	17 (2.60%)	C++
16	11 (1.68%)	CQL
16	11 (1.68%)	Go
17	10 (1.53%)	AWK
18	7 (1.07%)	Bourne shell
18	7 (1.07%)	Dart

Qualifications
1	190 (29.10%)	Security Cleared
2	172 (26.34%)	SC Cleared
3	46 (7.04%)	Degree
4	22 (3.37%)	Cisco Certification
5	20 (3.06%)	RHCE
6	18 (2.76%)	RHCSA
7	17 (2.60%)	Computer Science Degree
8	16 (2.45%)	DV Cleared
9	14 (2.14%)	CCNP
9	14 (2.14%)	VMware Certified Professional (VCP)
10	13 (1.99%)	CCNA
10	13 (1.99%)	Microsoft Certification
11	8 (1.23%)	Master's Degree
12	7 (1.07%)	CESG Certified Professional
12	7 (1.07%)	CLAS
12	7 (1.07%)	OCA
12	7 (1.07%)	OCP
12	7 (1.07%)	Oracle Certification
13	6 (0.92%)	AWS Certification
13	6 (0.92%)	MCP

Quality Assurance & Compliance
1	11 (1.68%)	JSP 440
2	10 (1.53%)	Disclosure Scotland
2	10 (1.53%)	QA
3	9 (1.38%)	ISO/IEC 27001
4	4 (0.61%)	PCI DSS
5	3 (0.46%)	SLA
6	2 (0.31%)	PMO

System Software
1	227 (34.76%)	Docker
2	132 (20.21%)	VMware Infrastructure
3	73 (11.18%)	Virtual Machines
4	68 (10.41%)	Active Directory
5	45 (6.89%)	KVM
6	44 (6.74%)	Hyper-V
7	36 (5.51%)	VMware ESXi
8	29 (4.44%)	Xen
9	22 (3.37%)	Squid
10	19 (2.91%)	vCloud
11	18 (2.76%)	vSphere
12	12 (1.84%)	Apache ZooKeeper
13	11 (1.68%)	Postfix
14	9 (1.38%)	HDFS
14	9 (1.38%)	LXC
15	7 (1.07%)	GlusterFS
15	7 (1.07%)	iptables
15	7 (1.07%)	Veritas Cluster Server
16	6 (0.92%)	Samba
17	5 (0.77%)	NFS

Systems Management
1	273 (41.81%)	Puppet
2	252 (38.59%)	Ansible
3	114 (17.46%)	Terraform
4	109 (16.69%)	Opscode Chef
5	87 (13.32%)	Kubernetes
6	86 (13.17%)	Nagios
7	40 (6.13%)	logstash
8	37 (5.67%)	ZABBIX
9	34 (5.21%)	Kibana
10	32 (4.90%)	Graphite
11	27 (4.13%)	Packer
12	24 (3.68%)	SELinux
13	21 (3.22%)	yum
14	20 (3.06%)	Grafana
15	19 (2.91%)	NetBackup
16	17 (2.60%)	Rancher
17	16 (2.45%)	Red Hat Satellite
18	15 (2.30%)	Rsyslog
18	15 (2.30%)	vCenter Server
19	14 (2.14%)	Red Hat Spacewalk

Vendors
1	299 (45.79%)	Red Hat
2	218 (33.38%)	VMware
3	60 (9.19%)	Oracle
4	58 (8.88%)	Microsoft
5	44 (6.74%)	Cisco
6	42 (6.43%)	HP
7	31 (4.75%)	Splunk
8	28 (4.29%)	EMC
9	22 (3.37%)	AppDynamics
9	22 (3.37%)	Atlassian
10	20 (3.06%)	NetApp
11	19 (2.91%)	SaltStack
12	14 (2.14%)	Cloudera
13	13 (1.99%)	Citrix
13	13 (1.99%)	PagerDuty
13	13 (1.99%)	Symantec
14	12 (1.84%)	IBM
14	12 (1.84%)	Sonatype
15	11 (1.68%)	Juniper
15	11 (1.68%)	Sybase