The following table provides summary statistics for permanent job vacancies advertised in London with a requirement for Postfix skills. Included is a benchmarking guide to the salaries offered in vacancies that have cited Postfix over the 3 months to 29 March 2017 with a comparison to the same period in the previous 2 years.

Postfix
England / London
3 months to
29 Mar 2017
Same period 2016 Same period 2015
Rank 586 629 634
Rank change year-on-year +43 +5  
Permanent jobs citing Postfix 2 25 28
As % of all permanent IT jobs advertised in London 0.006% 0.059% 0.066%
As % of the System Software category 0.048% 0.50% 0.51%
Number of salaries quoted 2 8 25
Median salary £28,750 £50,000 £55,000
Median salary % change year-on-year -42.50% -9.09%  
90% offered a salary of more than £23,750 £47,000 £44,500
10% offered a salary of more than £33,750 £55,000 £70,000
UK excluding London median salary £40,000 £45,000 £44,000
% change year-on-year -11.11% +2.27%  

Postfix is in the system software skills category. The next table is for comparison with the above and provides summary statistics for all permanent job vacancies advertised in London with a requirement for system software skills.

System Software Skills
London
Permanent job vacancies with a requirement for system software skills 4183 4971 5467
As % of all permanent IT job vacancies advertised in London 12.37% 11.73% 12.84%
Number of salaries quoted 3572 4325 4735
Median salary £50,000 £50,000 £47,500
Median salary % change year-on-year - +5.26%  
90% offered a salary of more than £29,000 £29,500 £29,000
10% offered a salary of more than £77,500 £70,000 £70,000
UK excluding London median salary £38,000 £38,000 £37,500
% change year-on-year - +1.33%  

Postfix
Job Vacancy Trend in London

The job posting trend of jobs advertised in London citing Postfix as a proportion of all permanent or contract IT jobs with a match in the System Software category.

Job vacancy trend for Postfix in London

Postfix
Salary Trend in London

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

Salary trend for Postfix in London

Postfix
Salary Histogram in London

The salary distribution of IT jobs citing Postfix in London over the 3 months to 29 March 2017.

Salary histogram for Postfix in London

For the 6 months to 29 March 2017, IT jobs citing Postfix 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 London region with a requirement for Postfix.

1 5 (100.00%) Linux
2 4 (80.00%) EMC
2 4 (80.00%) NetApp
2 4 (80.00%) VMware
2 4 (80.00%) VMware Infrastructure
3 3 (60.00%) CentOS
3 3 (60.00%) Squid
3 3 (60.00%) Red Hat
3 3 (60.00%) VPN
3 3 (60.00%) DNS
3 3 (60.00%) MySQL
3 3 (60.00%) Unix
3 3 (60.00%) Python
3 3 (60.00%) Apache
4 2 (40.00%) FTP
4 2 (40.00%) SharePoint
4 2 (40.00%) MS Exchange
4 2 (40.00%) Windows
4 2 (40.00%) AIX
4 2 (40.00%) Perl
4 2 (40.00%) SQL
4 2 (40.00%) Cisco
4 2 (40.00%) Microsoft
4 2 (40.00%) TCP/IP
4 2 (40.00%) Active Directory
4 2 (40.00%) HP
4 2 (40.00%) Dell
4 2 (40.00%) Veritas
4 2 (40.00%) Brocade
4 2 (40.00%) VLAN

Postfix
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 3 (60.00%) Apache
2 2 (40.00%) Exchange Server 2010
2 2 (40.00%) Exchange Server 2013
2 2 (40.00%) MS Exchange
2 2 (40.00%) SharePoint
2 2 (40.00%) Skype for Business
3 1 (20.00%) Jetty
3 1 (20.00%) Tomcat
Communications & Networking
1 3 (60.00%) DNS
1 3 (60.00%) VPN
2 2 (40.00%) Firewall
2 2 (40.00%) FTP
2 2 (40.00%) NAS
2 2 (40.00%) SAN
2 2 (40.00%) Skype
2 2 (40.00%) TCP/IP
2 2 (40.00%) VLAN
3 1 (20.00%) OpenVPN
3 1 (20.00%) SMTP
Database & Business Intelligence
1 3 (60.00%) MySQL
2 1 (20.00%) Couchbase
Development Applications
1 1 (20.00%) Bitbucket
1 1 (20.00%) Git (software)
1 1 (20.00%) Jenkins
General
1 2 (40.00%) Advertising
2 1 (20.00%) Marketing
Job Titles
1 2 (40.00%) Senior Server Engineer
1 2 (40.00%) Server Engineer
2 1 (20.00%) 2nd Line Support
2 1 (20.00%) 3rd Line Engineer
2 1 (20.00%) Administrator
2 1 (20.00%) Junior
2 1 (20.00%) Junior Systems Administrator
2 1 (20.00%) Systems Administrator
Libraries, Frameworks & Software Standards
1 1 (20.00%) Dropwizard
1 1 (20.00%) Java EE
1 1 (20.00%) JMX
1 1 (20.00%) LAMP
1 1 (20.00%) Swagger
Miscellaneous
1 1 (20.00%) Clustering
1 1 (20.00%) Computer Science
Operating Systems
1 5 (100.00%) Linux
2 3 (60.00%) CentOS
2 3 (60.00%) Unix
3 2 (40.00%) AIX
3 2 (40.00%) Red Hat Enterprise Linux
3 2 (40.00%) Windows
3 2 (40.00%) Windows 10
3 2 (40.00%) Windows 7
3 2 (40.00%) Windows 8
4 1 (20.00%) Debian
4 1 (20.00%) Ubuntu
Processes & Methodologies
1 2 (40.00%) Migration
1 2 (40.00%) Performance Tuning
1 2 (40.00%) Time Management
2 1 (20.00%) Agile Software Development
2 1 (20.00%) DevOps
2 1 (20.00%) Digital Marketing
2 1 (20.00%) Open Source
Programming Languages
1 3 (60.00%) Python
2 2 (40.00%) Perl
2 2 (40.00%) SQL
3 1 (20.00%) Bash Shell
3 1 (20.00%) Java
Qualifications
1 1 (20.00%) CCNA
1 1 (20.00%) Cisco Certification
1 1 (20.00%) Degree
1 1 (20.00%) MCSA
1 1 (20.00%) MCSE
1 1 (20.00%) Microsoft Certification
Quality Assurance & Compliance
1 1 (20.00%) PCI DSS
System Software
1 4 (80.00%) VMware Infrastructure
2 3 (60.00%) Squid
3 2 (40.00%) Active Directory
3 2 (40.00%) Hyper-V
3 2 (40.00%) Microsoft Virtual Server
3 2 (40.00%) Sendmail
3 2 (40.00%) Virtual Servers
3 2 (40.00%) VMware ESX
3 2 (40.00%) vSphere
4 1 (20.00%) Corosync
4 1 (20.00%) KVM
4 1 (20.00%) NFS
4 1 (20.00%) Xen
Systems Management
1 2 (40.00%) Ansible
1 2 (40.00%) Backup Exec
1 2 (40.00%) Opscode Chef
1 2 (40.00%) Puppet
2 1 (20.00%) Bacula
2 1 (20.00%) HAProxy
2 1 (20.00%) ZABBIX
Vendors
1 4 (80.00%) EMC
1 4 (80.00%) NetApp
1 4 (80.00%) VMware
2 3 (60.00%) Red Hat
3 2 (40.00%) Brocade
3 2 (40.00%) Cisco
3 2 (40.00%) Dell
3 2 (40.00%) HP
3 2 (40.00%) Microsoft
3 2 (40.00%) Veritas