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 14 January 2026, with comparisons to the same periods in the previous two years.
| 6 months to 14 Jan 2026 |
Same period 2025 | Same period 2024 | |
|---|---|---|---|
| Rank | - | 526 | 588 |
| Rank change year-on-year | - | +62 | - |
| Contract jobs citing OS/400 | 0 | 1 | 2 |
| As % of all contract jobs in the UK | - | 0.003% | 0.005% |
| As % of the Operating Systems category | - | 0.023% | 0.032% |
| Number of daily rates quoted | 0 | 1 | 2 |
| 10th Percentile | - | - | £517 |
| 25th Percentile | - | - | £519 |
| Median daily rate (50th Percentile) | - | £480 | £545 |
| Median % change year-on-year | - | -11.98% | - |
| 75th Percentile | - | - | £579 |
| 90th Percentile | - | - | £585 |
| UK excluding London median daily rate | - | £480 | £545 |
| % change year-on-year | - | -11.98% | - |
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 | 4,691 | 4,429 | 6,284 |
| As % of all contract IT jobs advertised in the UK | 12.69% | 14.01% | 14.78% |
| Number of daily rates quoted | 3,096 | 2,764 | 4,288 |
| 10th Percentile | £175 | £200 | £180 |
| 25th Percentile | £263 | £315 | £300 |
| Median daily rate (50th Percentile) | £450 | £475 | £475 |
| Median % change year-on-year | -5.26% | - | -7.32% |
| 75th Percentile | £560 | £588 | £600 |
| 90th Percentile | £670 | £688 | £700 |
| UK excluding London median daily rate | £413 | £425 | £427 |
| % change year-on-year | -2.94% | -0.35% | -5.22% |
| Number of hourly rates quoted | 334 | 166 | 312 |
| 10th Percentile | £15.00 | £16.25 | £14.16 |
| 25th Percentile | £18.87 | £21.00 | £17.72 |
| Median hourly rate | £25.15 | £33.25 | £31.00 |
| Median % change year-on-year | -24.36% | +7.26% | +24.00% |
| 75th Percentile | £61.25 | £65.00 | £65.00 |
| 90th Percentile | £70.00 | £70.50 | £73.75 |
| UK excluding London median hourly rate | £25.00 | £30.93 | £26.09 |
| % change year-on-year | -19.17% | +18.55% | +15.96% |
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.
