Job Description

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.

As our Engineering Manager, Systems Software, you'll lead the teams building the low-level software stack that connects our optical hardware to the broader compute ecosystem.

The Role:

You will lead and scale Flux's System Software team, responsible for everything from device drivers and runtime systems to performance-critical I/O and diagnostic tooling. You'll define technical strategy, drive execution, and help build one of the most technically ambitious teams in the industry.

Key Responsibilities:

Lead and grow

a high-performing performance modelling and compiler teams in a fast-paced, high-expectation environment.

Own delivery

of complex, cross-functional projects across optics, hardware, and software that drive customer and business outcomes.

Shape the engineering strategy and architecture

, aligning current and future OTPU performance with Flux's broader product roadmap and technical vision.

Build organisational capacity

by hiring exceptional engineers, mentoring emerging leaders, and establishing scalable processes.

Drive quality and reliability

across drivers, virtualisation, and diagnostic software.

Partner cross-functionally

with optics, hardware, and software teams to bring the OTPU to market.

Skills & Experience:

In order to set you up for success as an Engineer Manager at Flux, we're looking for the following skills and experience:

Have 5+ years of experience managing engineering teams of 5-10 in a high-performance, fast-paced environment. Experienced in hyper-scaling and managing managers preferred. Proven expertise in systems software spanning Linux kernel and driver development (memory, I/O, DMA, IOMMU, PCIe), virtualisation (KVM, Xen, VFIO, SR-IOV), and performance optimisation and diagnostic software for AI, GPU, or accelerator hardware. Strong track record of leading world-class teams and delivering customer and business outcomes. Thrive in ambiguity and can adapt quickly to rapidly changing conditions. Have experience closing competitive candidates for your team, and the ability to craft and convey compelling visions of the future Have a strong coaching mindset and excel at guiding engineers to reach their peak potential.

Compensation & Benefits:

171,000+

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.

We're building fast and that includes our benefits. More exciting additions are coming soon.

If you are passionate about pushing the boundaries of what's possible in AI and thrive in a high-energy, fast-paced environment, we want to hear from you.

Compensation Range: 171K - 209K