Senior Process Integration Engineer

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 headphones and ergonomic setups to keep you comfortable and focused.

• Personal company card to spend on tools that help you do your job - like ChatGPT Pro or anything else that boosts your workflow.

• Healthy, chef-cooked dinners in the office every night, with something for every diet and tastebud.

• Monthly off-site team socials.

• 25 days of paid holiday, plus all the UK bank holidays.

• Access to our in-house 3D printer for personal or work projects.

• Cycle2work scheme.

• Need a caffeine fix? We’ve got you covered with a tab at our favourite local coffee shop.

• We offer a pension plan and salary sacrifice options.

Due to U.S. export control regulations, candidates’ eligibility to work at Flux depends on their most recent citizenship or permanent residency status. We are generally unable to consider applicants whose most recent citizenship or permanent residence is in certain restricted countries (currently including Iran, North Korea, Syria, Cuba, Russia, Belarus, China, Hong Kong, Macau, and Venezuela). Applicants who have subsequently obtained citizenship or permanent residency in another country not subject to these restrictions may still be eligible.

We do not accept unsolicited CVs from recruitment agencies, will not be liable for any fees, and prohibit unauthorised use of our company name in recruitment activities.