AI Inference Engineer

Fuse Energy Supply; Greater London; On-site; GBP 63,000 - 103,000; Full time

Benefits offered by this job

Equity sign-on bonus

Biannual bonus

Fully expensed tech

Breakfast and dinner allowance

Job summary

Fuse Energy seeks a founding engineer to define and build our inference serving stack, driving architecture decisions for high-throughput, low-latency workloads. You will own model-level optimisation strategies, including quantisation and speculative decoding, and collaborate with CUDA/GPU teams to integrate performance work.

The role reports directly to the CTO in a pioneering energy-AI platform, with equity and competitive compensation in a fast-growing startup environment.

Qualifications

• 4+ years of experience building or operating large-scale inference serving systems.

Responsibilities

• Define our inference serving strategy and architecture from first principles.

Skills

Inference serving

GPU/CUDA collaboration

System architecture

Performance optimisation

Kubernetes

Multi-tenant infra

Hyperscaler experience

Quantisation/Distillation

SLA-driven infra

Leadership

Tools

vLLM

TensorRT-LLM

Triton Inference Server

SGLang

Job description

Salary: £63,000 - 103,000 per year

Requirements:

• 4+ years of experience building or operating large-scale inference serving systems, or equivalent strong project/industry experience.
• Deep, hands-on experience with inference serving frameworks and the techniques used to optimise them, including batching, KV-cache management, quantisation, and speculative decoding.
• Strong systems thinking, with the ability to reason about the full path from incoming request to served response across a large cluster.
• Comfort working directly with GPU/CUDA engineers to integrate low-level performance work into a serving system.
• A track record of making high-stakes architecture calls and owning the outcome.
• Comfort operating without a playbook in a founding role shaping a new function around early-stage architecture.
• Experience with Triton or custom ML inference/training frameworks is nice to have.
• Experience with autoscaling or capacity planning for large-scale inference workloads is nice to have.
• Exposure to multi-tenant serving or SLA-driven infrastructure is nice to have.
• Background at a hyperscaler, frontier AI lab, or large-scale distributed inference system is nice to have.
• Familiarity with Kubernetes/Slurm for cluster orchestration is nice to have.
• Interest or experience in energy markets, grid systems, or sustainability-focused compute is nice to have.

Responsibilities:

• Define our inference serving strategy and architecture from first principles.
• Design and build the serving stack, including request routing, batching, scheduling, and autoscaling for high-throughput, latency-sensitive inference workloads.
• Own our model-level optimisation strategy for serving, deciding where and how to apply quantisation, distillation, speculative decoding, and similar techniques to improve throughput and cost per token, partnering with our CUDA/GPU engineers.
• Make the core software architecture decisions on serving frameworks and orchestration, such as vLLM, TensorRT-LLM, SGLang, Triton Inference Server, or equivalents.
• Translate throughput, latency, and uptime commitments into concrete technical specifications and serving capacity plans.
• Act as a direct technical owner of inference performance and reliability.
• Work closely with our CUDA and GPU engineering teams to ensure custom kernels and hardware performance work are integrated cleanly into the serving layer.
• Set the standards, tooling, and benchmarks this function will run on as it grows.

Technologies:

• AI
• CTO
• CUDA
• Hardware
• Kubernetes
• LLM
• vLLM

More:

We are Fuse Energy, a forward-thinking renewable energy startup on a mission to deliver a terawatt of renewable energy fast. We combine first-principles thinking with cutting-edge technology to build a radically better energy system, and we have raised $210M from top-tier investors including Multicoin, Balderton, Lakestar, Accel, Creandum, Lowercarbon, Ribbit, Box Group, and strategic angels such as Nico Rosberg, the Co-Founder of Solana, and GPs behind Meta, Revolut, Spotify, Uber, and more. As data centres become one of the largest and fastest-growing sources of electricity demand, we are expanding into high-performance compute infrastructure at the intersection of energy and AI. We are building the GPU/CUDA performance layer and the inference serving layer from scratch, and this founding engineer role reports directly to our CTO. We offer a competitive salary, an equity sign-on bonus, a biannual bonus scheme, fully expensed tech to match your needs, and a breakfast and dinner allowance for office-based employees.

• A competitive salary
• An equity sign-on bonus
• A biannual bonus scheme
• Fully expensed tech to match your needs
• A breakfast and dinner allowance for office-based employees

last updated 36 week of 2026