Senior Mechanical Engineer (£70k-£90k + Equity) at Seed-stage synthetic fuel startup

Company: Jack & Jill

Location: London

Posted: May 5th, 2026

Job Title

Senior Mechanical Engineer

Salary

£70k-£90k + Equity

Company Description

Seed-stage synthetic fuel startup decarbonising heavy industry through first-principles hardware engineering

Location

London, UK

Job Description

You will own the end-to-end design and manufacture of critical hardware sub-systems, including reactors and electrolysers. Tasked with making synthetic fuel cheaper than fossil fuels, you will rethink low-volume technologies for mass production. This role involves everything from concept generation and CAD to hands‑on fabrication and commissioning in our London workshop.

Why this role is remarkable

What You Will Do

The ideal candidate

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