IBM OS/400 (OS400)
UK
The table below provides summary statistics and contractor rates for jobs requiring OS/400 skills. It covers contract job vacancies from the 6 months leading up to 30 November 2025, with comparisons to the same periods in the previous two years.
| 6 months to 30 Nov 2025 |
Same period 2024 | Same period 2023 | |
|---|---|---|---|
| Rank | - | 557 | 625 |
| Rank change year-on-year | - | +68 | - |
| Contract jobs citing OS/400 | 0 | 4 | 2 |
| As % of all contract jobs in the UK | - | 0.011% | 0.004% |
| As % of the Operating Systems category | - | 0.079% | 0.029% |
| Number of daily rates quoted | 0 | 4 | 2 |
| 10th Percentile | - | - | £517 |
| 25th Percentile | - | £480 | £519 |
| Median daily rate (50th Percentile) | - | £540 | £545 |
| Median % change year-on-year | - | -0.97% | - |
| 75th Percentile | - | £600 | £579 |
| 90th Percentile | - | - | £585 |
| UK excluding London median daily rate | - | £600 | £545 |
| % change year-on-year | - | +10.03% | - |
All Operating Systems
UK
OS/400 falls under the Operating Systems category. For comparison with the information above, the following table provides summary statistics for all contract job vacancies requiring operating system skills.
| Contract vacancies with a requirement for operating system skills | 4,752 | 5,094 | 6,938 |
| As % of all contract IT jobs advertised in the UK | 13.26% | 14.05% | 15.15% |
| Number of daily rates quoted | 3,062 | 3,109 | 4,717 |
| 10th Percentile | £181 | £200 | £183 |
| 25th Percentile | £263 | £325 | £300 |
| Median daily rate (50th Percentile) | £450 | £475 | £475 |
| Median % change year-on-year | -5.26% | - | -7.32% |
| 75th Percentile | £563 | £583 | £609 |
| 90th Percentile | £660 | £688 | £700 |
| UK excluding London median daily rate | £401 | £440 | £438 |
| % change year-on-year | -8.86% | +0.57% | -2.78% |
| Number of hourly rates quoted | 368 | 208 | 343 |
| 10th Percentile | £15.50 | £16.18 | £14.47 |
| 25th Percentile | £18.87 | £22.44 | £18.13 |
| Median hourly rate | £25.00 | £50.00 | £30.00 |
| Median % change year-on-year | -50.00% | +66.67% | +20.00% |
| 75th Percentile | £55.03 | £67.50 | £65.00 |
| 90th Percentile | £67.84 | £70.00 | £73.75 |
| UK excluding London median hourly rate | £25.00 | £51.25 | £27.25 |
| % change year-on-year | -51.22% | +88.07% | +21.11% |
OS/400
Job Vacancy Trend
Historical trend showing the proportion of contract IT job postings citing OS/400 relative to all contract IT jobs advertised.
OS/400
Daily Rate Trend
Contractor daily rate distribution trend for jobs in the UK citing OS/400.
OS/400
Hourly Rate Trend
Contractor hourly rate distribution trend for jobs in the UK citing OS/400.
