The table below provides summary statistics for permanent job vacancies advertised in London requiring X.21 skills. It includes a benchmarking guide to the annual salaries offered in vacancies that cited X.21 over the 6 months leading up to 23 May 2025, comparing them to the same period in the previous two years.
X.21 falls under the Communications and Computer Networking category. For comparison with the information above, the following table provides summary statistics for all permanent job vacancies requiring communications or computer networking skills in London.
Permanent vacancies with a requirement for communications or computer networking skills
1,877
3,240
3,951
As % of all permanent jobs advertised in London
14.90%
13.71%
11.84%
Number of salaries quoted
890
1,984
2,700
10th Percentile
£33,250
£32,750
£32,750
25th Percentile
£45,000
£42,500
£42,631
Median annual salary (50th Percentile)
£65,000
£60,000
£62,500
Median % change year-on-year
+8.33%
-4.00%
+2.65%
75th Percentile
£85,000
£77,500
£82,548
90th Percentile
£105,000
£95,000
£100,000
England median annual salary
£46,000
£47,500
£50,000
% change year-on-year
-3.16%
-5.00%
-4.76%
X.21 Job Vacancy Trend in London
Job postings citing X.21 as a proportion of all IT jobs advertised in London.
X.21 Salary Trend in London
3-month moving average salary quoted in jobs citing X.21 in London.
X.21 Top 29 Co-occurring Skills and Capabilities in London
For the 6 months to 23 May 2025, job vacancies citing X.21 also mentioned the following skills and capabilities in order of popularity.
The figures indicate the absolute number co-occurrences and as a proportion of all permanent job ads across the London region with a requirement for X.21.
X.21 Co-occurring Skills and Capabilities in London by Category
The follow tables expand on the table above by listing co-occurrences grouped by category.
The same employment type, locality and period is covered with up to 20 co-occurrences shown in each of the following categories:
