Software Engineer (Safety-Critical)
Calder Mobility · Rail and transit
Timetable optimisation for regional rail, where the output is checked by a human before it moves a train.
Salary band
£75,000 – £92,000
- Location
- Leeds
- Pattern
- Hybrid
- Posted
- 25 Aug 2026 (9d ago)
- Process
- 3 stages, listed below
No account needed. One of us reads it before anything reaches the company.
The work
A timetable is a scheduling problem with a very long list of constraints, some of which are legal.
Worth knowing
- Two days a week in Leeds.
- Feedback loops are long. A change ships to a real railway on a quarterly cycle.
Must have
- Software in a safety-related domain
- Optimisation or constraint solving
- Rigour about correctness
Nice to have
- Rail, aviation or automotive
- CENELEC EN 50128
Interview process
If the client adds a stage after you’ve started, we’ll tell you, and you can withdraw.
- 01
Intro call
30 minTheir questions and yours. No competency framework.
- 02
Technical conversation
60 minWalk through something you built. No live coding.
- 03
Team and offer
45 minMeet the people you would work with, talk numbers.
Other backend roles
Senior Backend Engineer (Go)
£85k–£105kNorthsea Grid · Edinburgh · Hybrid
Staff Engineer, Ledger (Rust)
£110k–£135kWexford Pay · Manchester · Hybrid
Systems Engineer (Rust)
£90k–£115kTessellate Systems · Remote, UK · Fully remote