Principal Process Engineer (UK)

We are looking for a Principal Process Engineer with 10+ years of experience to own process engineering across Rivan's modular synthetic fuel system, from novel architecture design through to deployment and commissioning. You'll bring deep experience designing, building, and operating process plants, combined with the creativity and pace to apply that knowledge to first-of-a-kind technology at rapid scale. Rivan has deployed the UK's largest synthetic fuel plant and is planning to 1000x this scale, so we need someone who can prevent costly rework by getting the process design right from the start. This is a rare opportunity to join a generational company at a foundational moment, with complete ownership of process safety and system design across reactor, electrolyser, and DAC modules.

What will you be doing?

• Owning process engineering across the full Rivan system, reactor, electrolyser, and direct air capture, from concept through deployment

• Leading process safety including HAZOPs, hazard assessments, and FMEAs to ensure designs are safe and compliant at multi-megawatt scale

• Ideating novel process architectures optimised for lowest cost of methane production rather than highest efficiency, a fundamentally different design philosophy

• Overseeing construction and commissioning of large-scale synthetic fuel sites, bringing experience from prior large project deployments

• Embedding institutional knowledge to prevent design rework as Rivan scales from 1MW proof-of-scale to 50MW+ mass manufacturing