The following table provides summary statistics for permanent job vacancies with a requirement for POSIX skills. Included is a benchmarking guide to the salaries offered in vacancies that have cited POSIX over the 3 months to 23 March 2017 with a comparison to the same period in the previous 2 years.

3 months to
23 Mar 2017
Same period 2016 Same period 2015
Portable Operating System Interface (POSIX)
UK
Rank 814 906 927
Rank change year-on-year +92 +21  
Permanent jobs citing POSIX 35 40 29
As % of all permanent IT jobs advertised in the UK 0.042% 0.039% 0.028%
As % of the Libraries, Frameworks & Software Standards category 0.10% 0.10% 0.073%
Number of salaries quoted 23 33 20
Median salary £40,000 £52,500 £55,000
Median salary % change year-on-year -23.80% -4.54%  
90% offered a salary of more than £30,000 £40,000 £38,564
10% offered a salary of more than £62,500 £79,000 £83,250
UK excluding London median salary £30,000 £47,500 £50,000
% change year-on-year -36.84% -5.00%  

POSIX is in the industry standards, technical specifications and software library and framework skills category. The next table is for comparison with the above and provides summary statistics for all permanent job vacancies with a requirement for industry standards, technical specifications and software library and framework skills.

Software Library & Framework Skills
UK
Permanent job vacancies with a requirement for industry standards, technical specifications and software library and framework skills 33438 39322 39675
As % of all permanent IT job vacancies advertised in the UK 39.92% 38.33% 37.69%
Number of salaries quoted 28547 33855 33669
Median salary £45,000 £45,000 £44,000
Median salary % change year-on-year - +2.27%  
90% offered a salary of more than £31,500 £30,500 £30,000
10% offered a salary of more than £70,000 £65,000 £67,500
UK excluding London median salary £40,000 £42,500 £40,000
% change year-on-year -5.88% +6.25%  

POSIX
Job Vacancy Trend

The job posting trend of jobs advertised citing POSIX as a proportion of all permanent or contract IT jobs with a match in the Libraries, Frameworks & Software Standards category.

Job vacancy trend for POSIX in the UK

POSIX
Salary Trend

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

Salary trend for POSIX in the UK

POSIX
Salary Histogram

The salary distribution of IT jobs citing POSIX over the 3 months to 23 March 2017.

Salary histogram for POSIX in the UK

POSIX
Top 17 Job Locations

The table below looks at the demand and provides a guide to the median salaries quoted in IT jobs citing POSIX within the UK over the 3 months to 23 March 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
Permanent
IT Job Ads
Median Salary
Last 3 Months
Median Salary
% Change
on Same Period
Last Year
Live
Job
Vacancies
England +87 34 £38,750 -26.19% 6
East of England +40 14 £30,000 -29.41% 5
Cambridgeshire +24 13 £30,000 -29.41% 4
London +73 11 £62,500 -16.66%
Cambridge +14 11 £30,000 -29.41% 4
South East +59 5 £41,500 -20.95%
North West -18 4 £40,000 -
Manchester -23 4 £40,000 -27.27%
Reading +31 3 £41,500 -20.95%
Berkshire +22 3 £41,500 -20.95%
Buckinghamshire - 2 £38,750 -
Milton Keynes - 2 £38,750 -
Saffron Walden - 1 £44,296 - 1
Mayfair - 1 £90,000 -
Glasgow - 1 £72,500 -
Scotland - 1 £72,500 -
Essex - 1 £44,296 - 1

POSIX
Top 30 Related IT Skills

For the 6 months to 23 March 2017, IT jobs citing POSIX also mentioned the following skills in order of popularity. The figures indicate the number co-occurrences and its proportion to all job ads with a requirement for POSIX.

1 36 (81.82%) C++
2 33 (75.00%) Python
3 32 (72.73%) C
4 29 (65.91%) Linux
5 26 (59.09%) Mathematics
6 25 (56.82%) Software Engineering
7 21 (47.73%) Agile Software Development
7 21 (47.73%) Degree
8 20 (45.45%) OO
8 20 (45.45%) Java
9 19 (43.18%) TCP/IP
9 19 (43.18%) Shell Script
9 19 (43.18%) Computer Science
10 18 (40.91%) Perl
11 17 (38.64%) HTML
11 17 (38.64%) Windows
11 17 (38.64%) Open Source
11 17 (38.64%) Jenkins
12 16 (36.36%) Memory Management
12 16 (36.36%) Continuous Integration
12 16 (36.36%) STL
12 16 (36.36%) CSS
12 16 (36.36%) C#
12 16 (36.36%) Finance
13 15 (34.09%) PostgreSQL
13 15 (34.09%) SQL
13 15 (34.09%) JSP
13 15 (34.09%) JUnit
13 15 (34.09%) Oracle
13 15 (34.09%) XML

POSIX
Top Related 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
1 15 (34.09%) JBoss
2 14 (31.82%) Tomcat
3 13 (29.55%) Jetty
3 13 (29.55%) nginx
3 13 (29.55%) WebLogic
3 13 (29.55%) WebSphere
4 1 (2.27%) OpenStack
Communications & Networking
1 19 (43.18%) TCP/IP
2 15 (34.09%) HTTP
3 13 (29.55%) HTTPS
3 13 (29.55%) SNMP
4 10 (22.73%) Bluetooth
4 10 (22.73%) Wi-Fi
4 10 (22.73%) Wireless
5 8 (18.18%) SAN
6 5 (11.36%) Internet
6 5 (11.36%) iSCSI
7 3 (6.82%) DNS
7 3 (6.82%) Firewall
7 3 (6.82%) FTP
7 3 (6.82%) Intranet
7 3 (6.82%) Intrusion Detection
7 3 (6.82%) MPLS
7 3 (6.82%) NAS
7 3 (6.82%) Network Security
7 3 (6.82%) Software-Defined Networking
7 3 (6.82%) SSH
Database & Business Intelligence
1 15 (34.09%) PostgreSQL
1 15 (34.09%) Relational Database
2 14 (31.82%) MySQL
3 13 (29.55%) InterSystems Cache
3 13 (29.55%) Oracle Database
3 13 (29.55%) Oracle Database 11g
4 2 (4.55%) HBase
5 1 (2.27%) Apache Cassandra
5 1 (2.27%) CouchDB
5 1 (2.27%) Data Mining
5 1 (2.27%) MariaDB
5 1 (2.27%) MongoDB
5 1 (2.27%) Neo4j
5 1 (2.27%) Redis
Development Applications
1 17 (38.64%) Jenkins
2 15 (34.09%) JUnit
3 14 (31.82%) GDB
4 13 (29.55%) Ant
4 13 (29.55%) CppUnit
4 13 (29.55%) Eclipse
4 13 (29.55%) Hudson
4 13 (29.55%) Maven
4 13 (29.55%) Sonatype Nexus
4 13 (29.55%) Subversion
4 13 (29.55%) Valgrind
4 13 (29.55%) XMLSpy
5 3 (6.82%) JIRA
6 2 (4.55%) Git (software)
6 2 (4.55%) TestNG
7 1 (2.27%) Atlassian Bamboo
7 1 (2.27%) GCC
General
1 16 (36.36%) Finance
2 13 (29.55%) Banking
3 3 (6.82%) Telecoms
4 1 (2.27%) Games
Job Titles
1 18 (40.91%) Software Engineer
2 16 (36.36%) Developer
3 12 (27.27%) C++ Developer
4 10 (22.73%) Embedded Engineer
4 10 (22.73%) Embedded Software Engineer
4 10 (22.73%) Graduate
4 10 (22.73%) Graduate Embedded Software Engineer
4 10 (22.73%) Graduate Software Engineer
5 8 (18.18%) Senior Software Engineer
6 7 (15.91%) C++ Software Engineer
6 7 (15.91%) Senior C++ Software Engineer
7 4 (9.09%) Linux Developer
7 4 (9.09%) Senior Developer
8 3 (6.82%) Administrator
8 3 (6.82%) Infrastructure Specialist
8 3 (6.82%) Linux Engineer
8 3 (6.82%) Linux Specialist
8 3 (6.82%) Senior C++ Developer
8 3 (6.82%) Systems Administrator
8 3 (6.82%) Unix Specialist
Libraries, Frameworks & Software Standards
1 17 (38.64%) HTML
2 16 (36.36%) CSS
2 16 (36.36%) STL
3 15 (34.09%) JSP
3 15 (34.09%) XML
4 14 (31.82%) Boost C++ Libraries
4 14 (31.82%) Node.js
4 14 (31.82%) REST
4 14 (31.82%) Web Services
5 13 (29.55%) Apache OpenJPA
5 13 (29.55%) Drools
5 13 (29.55%) J2EE
5 13 (29.55%) Java EE
5 13 (29.55%) JAX-WS
5 13 (29.55%) JPA
5 13 (29.55%) LEMP Stack
5 13 (29.55%) Pthreads
5 13 (29.55%) RESTful
5 13 (29.55%) SOAP
5 13 (29.55%) XSD
Miscellaneous
1 19 (43.18%) Computer Science
2 13 (29.55%) Enterprise Software
3 10 (22.73%) Embedded Systems
4 3 (6.82%) Algorithms
4 3 (6.82%) Linux Command Line
5 2 (4.55%) Analytical Skills
5 2 (4.55%) Data Centre
5 2 (4.55%) Data Structures
5 2 (4.55%) Device Driver
6 1 (2.27%) e-Health
6 1 (2.27%) Equities
6 1 (2.27%) Fixed Income
6 1 (2.27%) Foreign Exchange (FX)
6 1 (2.27%) Grid Computing
6 1 (2.27%) Management Information System
Operating Systems
1 29 (65.91%) Linux
2 17 (38.64%) Windows
3 5 (11.36%) Unix
4 3 (6.82%) CentOS
4 3 (6.82%) HPUX
4 3 (6.82%) Red Hat Enterprise Linux
4 3 (6.82%) SUSE
5 1 (2.27%) Debian
5 1 (2.27%) Embedded Linux
Processes & Methodologies
1 26 (59.09%) Mathematics
2 25 (56.82%) Software Engineering
3 21 (47.73%) Agile Software Development
4 20 (45.45%) OO
5 17 (38.64%) Open Source
6 16 (36.36%) Continuous Integration
6 16 (36.36%) Memory Management
7 14 (31.82%) API Design
7 14 (31.82%) Multithreading
8 13 (29.55%) Analytics
8 13 (29.55%) AOP
8 13 (29.55%) BPMN
8 13 (29.55%) ETL
8 13 (29.55%) Microservices
8 13 (29.55%) RUP
8 13 (29.55%) UML
8 13 (29.55%) Workflow
9 10 (22.73%) Computer Architecture
9 10 (22.73%) Embedded Software Development
10 5 (11.36%) OOD
Programming Languages
1 36 (81.82%) C++
2 33 (75.00%) Python
3 32 (72.73%) C
4 20 (45.45%) Java
5 19 (43.18%) Shell Script
6 18 (40.91%) Perl
7 16 (36.36%) C#
8 15 (34.09%) SQL
9 14 (31.82%) Go
9 14 (31.82%) JavaScript
9 14 (31.82%) Ruby
10 13 (29.55%) Groovy
10 13 (29.55%) Scala
11 9 (20.45%) Bash Shell
12 3 (6.82%) AWK
12 3 (6.82%) Haskell
12 3 (6.82%) Korn
12 3 (6.82%) R
12 3 (6.82%) sed
13 2 (4.55%) OCaml
Qualifications
1 21 (47.73%) Degree
2 1 (2.27%) CISSP
2 1 (2.27%) GSEC
2 1 (2.27%) PhD
System Software
1 10 (22.73%) Firmware
2 4 (9.09%) VMware Infrastructure
3 3 (6.82%) NFS
4 2 (4.55%) Docker
4 2 (4.55%) HDFS
4 2 (4.55%) QEMU
5 1 (2.27%) Active Directory
5 1 (2.27%) KVM
5 1 (2.27%) LXC
5 1 (2.27%) Slurm Workload Manager
5 1 (2.27%) Xen
Systems Management
1 1 (2.27%) Mesos
1 1 (2.27%) Puppet
1 1 (2.27%) Simpana
Vendors
1 15 (34.09%) Oracle
2 13 (29.55%) Altova
2 13 (29.55%) Google
2 13 (29.55%) ILOG
2 13 (29.55%) Splunk
3 4 (9.09%) VMware
4 3 (6.82%) HP
4 3 (6.82%) Microsoft
4 3 (6.82%) Red Hat
4 3 (6.82%) Sun
5 1 (2.27%) CommVault
5 1 (2.27%) Intel Security
5 1 (2.27%) Pegasus
5 1 (2.27%) Perforce
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