IBM OS/400 (OS400)
UK
The table below provides summary statistics and contractor rates for jobs requiring OS/400 skills. It covers vacancies from the 6 months leading up to 19 September 2025, with comparisons to the same periods in the previous two years.
| 6 months to 19 Sep 2025 |
Same period 2024 | Same period 2023 | |
|---|---|---|---|
| Rank | - | 558 | 628 |
| Rank change year-on-year | - | +70 | - |
| Contract jobs citing OS/400 | 0 | 4 | 4 |
| As % of all contract jobs advertised in the UK | - | 0.010% | 0.008% |
| As % of the Operating Systems category | - | 0.073% | 0.052% |
| 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 | 4,453 | 5,451 | 7,684 |
| As % of all contract IT jobs advertised in the UK | 13.51% | 14.15% | 15.50% |
| Number of daily rates quoted | 2,846 | 3,476 | 5,219 |
| 10th Percentile | £188 | £200 | £185 |
| 25th Percentile | £300 | £329 | £325 |
| Median daily rate (50th Percentile) | £450 | £475 | £500 |
| Median % change year-on-year | -5.26% | -5.00% | - |
| 75th Percentile | £575 | £575 | £625 |
| 90th Percentile | £674 | £675 | £706 |
| UK excluding London median daily rate | £432 | £450 | £450 |
| % change year-on-year | -4.00% | - | - |
| Number of hourly rates quoted | 281 | 270 | 370 |
| 10th Percentile | £15.50 | £15.96 | £15.18 |
| 25th Percentile | £18.87 | £20.30 | £18.50 |
| Median hourly rate | £25.15 | £50.00 | £47.50 |
| Median % change year-on-year | -49.70% | +5.26% | +98.66% |
| 75th Percentile | £58.75 | £68.75 | £65.00 |
| 90th Percentile | £67.00 | £70.00 | £76.53 |
| UK excluding London median hourly rate | £25.15 | £55.00 | £45.88 |
| % change year-on-year | -54.27% | +19.88% | +108.55% |
OS/400
Job Vacancy Trend
Job postings citing OS/400 as a proportion of all 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.
