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 31 October 2025, with comparisons to the same periods in the previous two years.
| 6 months to 31 Oct 2025 |
Same period 2024 | Same period 2023 | |
|---|---|---|---|
| Rank | - | 551 | 623 |
| Rank change year-on-year | - | +72 | - |
| Contract jobs citing OS/400 | 0 | 4 | 4 |
| As % of all contract jobs in the UK | - | 0.011% | 0.008% |
| As % of the Operating Systems category | - | 0.077% | 0.055% |
| Number of daily rates quoted | 0 | 4 | 4 |
| 10th Percentile | - | - | £517 |
| 25th Percentile | - | £480 | £519 |
| Median daily rate (50th Percentile) | - | £540 | £531 |
| Median % change year-on-year | - | +1.65% | - |
| 75th Percentile | - | £600 | £559 |
| 90th Percentile | - | - | £577 |
| UK excluding London median daily rate | - | £600 | £531 |
| % change year-on-year | - | +12.94% | - |
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 | 4,701 | 5,177 | 7,270 |
| As % of all contract IT jobs advertised in the UK | 13.71% | 14.13% | 15.38% |
| Number of daily rates quoted | 3,005 | 3,181 | 4,934 |
| 10th Percentile | £184 | £200 | £182 |
| 25th Percentile | £273 | £325 | £308 |
| Median daily rate (50th Percentile) | £450 | £475 | £488 |
| Median % change year-on-year | -5.26% | -2.56% | -3.47% |
| 75th Percentile | £573 | £575 | £615 |
| 90th Percentile | £652 | £675 | £700 |
| UK excluding London median daily rate | £413 | £449 | £450 |
| % change year-on-year | -8.13% | -0.22% | - |
| Number of hourly rates quoted | 345 | 231 | 357 |
| 10th Percentile | £15.40 | £16.25 | £14.25 |
| 25th Percentile | £18.87 | £21.90 | £17.72 |
| Median hourly rate | £24.50 | £52.50 | £32.50 |
| Median % change year-on-year | -53.33% | +61.54% | +32.65% |
| 75th Percentile | £41.94 | £68.75 | £65.00 |
| 90th Percentile | £67.00 | £70.00 | £76.53 |
| UK excluding London median hourly rate | £22.79 | £53.00 | £27.25 |
| % change year-on-year | -57.00% | +94.50% | +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.
