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100% REMOTE JOB: Senior Mainframe Security Analyst (RACF) - Must have - (Audit A...
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100% REMOTE JOB: Senior Mainframe Security Analyst (RACF) - Must have - (Audit Assessment expertise).Work Location: 100%...
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Mainframe Developer Contract Rates in Cardiff: Day Rate Quartiles and Demand
Live market telemetry, compensation quartiles, and IR35 compliance benchmarks across the UK contract sector.
Median Daily Rate
£570/day
+34.1%
Interquartile Range
£530/day – £674/day
Middle 50% market distribution
Contract Engagement Split
68% Outside IR35
6% Inside IR35 engagements
Market Conditions and Compensation Trajectory
Operating as an independent Mainframe Developer contractor in Cardiff offers distinct regional financial advantages, effectively balancing competitive local compensation against lower regional operational overheads. Aggregated telemetry across Cardiff records a regional median compensation benchmark of £570/day, registering a +34.1% variance against the broader UK contracting standard. Remuneration boundaries across active placements establish an interquartile band from £530/day to £674/day across 9 local Mainframe Developer vacancies to November 2026. Statutory compliance data indicates that 68% of active Cardiff assignments operate under verified outside-IR35 determinations.
Daily Rate Quartiles and Market Benchmarks
Values combine advertised day rates, stated IR35 outcomes, and sector labels from vacancies matching this hub. Quartiles use priced roles only.
| Metric | Value | What it shows |
|---|---|---|
| Median day rate | £570/day | Mid-market advertised pay for this hub |
| 25th percentile (P25) | £530/day | Lower-quartile priced vacancies |
| 75th percentile (P75) | £674/day | Upper-quartile priced vacancies |
| Outside IR35 share | 68% | Stated limited-company / outside SDS |
| Inside IR35 share | 6% | Stated PAYE / umbrella / inside SDS |
| Undetermined IR35 | 26% | Adverts that omit a published status |
| Leading sector | IT (97%) | Largest hiring cluster in the sample |
| Priced sample | 9 roles | Vacancies used for the rate corridor |
| Regional rate band | a regional rate discount versus London | Location pricing context, not an SDS |
Statutory Standards and Frequently Asked Questions
Cardiff does not create a special IR35 code for Mainframe Developer work. The client SDS should name the Cardiff workplace and delivery model. An inside finding on a Cardiff Mainframe Developer brief typically deducts tax at source, while outside IR35 Mainframe Developer work in Cardiff is billed by a PSC. Local pay sits on a regional rate discount versus London, so a higher Cardiff headline rate can still be inside. Commuting into Cardiff does not, by itself, prove substitution or lack of control. Read the Mainframe Developer Cardiff contract for workplace, hours, and equipment clauses.
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