Senior Process Integration Engineer

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AI demand is outpacing today's computing and energy capacity. Meeting that demand is one of the great challenges of our time, and a trillion-dollar question. Flux believes the answer lies beyond silicon. Our OTPUs (optical accelerators) will offer breakthrough performance at a fraction of the energy cost, unlocking a path past the rapidly approaching physical limits of traditional chips.

This isn't incremental innovation - it's a paradigm shift.

We're looking for a Senior Process Integration Engineer to design and implement bespoke fabrication flows for advanced micro-optical and MEMS-based devices. You'll bridge the gap between R&D concepts and manufacturable reality, building, iterating, and qualifying custom process sequences that underpin our next-generation hardware.

This role combines hands‑on technical depth with strategic process integration oversight. You'll spend time both in the cleanroom developing new flows and outside it, collaborating with partner fabs, R&D institutes, and equipment suppliers to push process capability forward.

• Custom process flow development - architect, prototype, and refine fabrication flows across silicon, glass, or compound substrates for MEMS and optical structures.
• Rapid prototyping & iteration - drive fast cycles from CAD to measured die, identifying and optimising key process levers.
• Process definition & scale‑up - document mask sets, material stacks, and dependencies; mature experimental flows into repeatable, pilot‑ready documentation.
• External collaboration - work directly with R&D partners, universities, and equipment manufacturers to qualify new process steps, tools, and materials.
• Hands‑on execution - operate and troubleshoot core process tools (lithography, deposition, etch, bonding) during development and transfer phases.
• Strategic oversight - guide internal technicians and external partners, ensuring process discipline, yield learning, and structured design feedback.
• Data‑driven optimisation - use DOE/SPC and metrology data to accelerate convergence and maintain process control.
• Knowledge capture & review - maintain detailed process documentation; run internal reviews and FMEA sessions.

• 5-15 years of experience in MEMS or advanced micro‑fabrication, with deep process integration expertise.
• Proven record creating or modifying complete process flows for novel MEMS or micro‑optical devices.
• Strong background in at least three of: photolithography, DRIE/RIE, thin‑film deposition (PVD/ALD), wafer bonding, or wet etch.
• Comfortable switching between hands‑on tool‑level work and high‑level process architecture and partner coordination.
• Experienced collaborating with external fabs, R&D consortia, or tool vendors to develop or transfer new capabilities.
• Proficient in DOE/SPC tools (JMP, Python, etc.) and disciplined process documentation.
• B.Eng./M.Sc./Ph.D. in Materials Science, Electrical/Mechanical Engineering, Physics, or related field.
• Excellent communicator; thrives in fast‑moving, interdisciplinary environments.
• Familiarity with wafer‑level packaging or flip‑chip integration for MEMS or optical devices.
• Experience transferring R&D processes to external pilot or production environments.
• Working knowledge of simulation and characterisation (FEM, profilometry, interferometry, L‑I‑V, or spectral testing).

• £82,000 - £119,000 annual salary, depending on experience, skills, and location.
• Competitive stock options, you're not just part of the journey, you will own a piece of it.
• Work from our HQ in King's Cross, right in the middle of London's buzzing AI scene.
• Live within 45 minutes of the office? Perfect. Live within 20 minutes? We'll add an extra location bonus to your salary.
• We offer visa sponsorship and full relocation support (UK and abroad), through a dedicated third‑party provider who are on hand to make your move to London as seamless as possible.
• Full BUPA healthcare and dental cover, medical history disregarded.
• High‑spec tech for everyone - M4 Macs as standard, M4 Pros for Engineers.
• Sony noise‑cancelling…