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Fractile

Fractile is focused on developing advanced chips, systems, and software to enhance the efficiency and cost-effectiveness of running large AI models. Their innovative approach integrates computation with memory, addressing the limitations of existing hardware in AI inference. By rearchitecting the inference stack, Fractile aims to enable significant advancements in AI capabilities, facilitating the operation of the world's largest models at a global scale.

<div>GRADUATE MODELLING ENGINEER

Graduate &amp; Early Career &middot; Pre-Silicon Engineering &middot; London or Bristol &middot; Hybrid

Most graduate roles in hardware put you in a queue. You inherit a task, run it through a flow someone else designed, and wait your turn to matter. This is not that.

At Fractile, the modelling team sits upstream of everything &mdash; the decisions made here shape the chip before RTL is written, before constraints are locked, before anyone else has a chance to course-correct. That means the work is high-stakes, intellectually demanding, and genuinely consequential from day one.

You will not be on a rotation programme. You will not be sitting in review meetings waiting for your turn to present. You will be contributing to architectural decisions that end up in silicon &mdash; working directly alongside engineers who have shipped chips at Arm, Intel, Apple, and Google, in a team small enough that your ideas get heard and your work has a name on it.

About Fractile

Fractile is building silicon, systems and software which will redefine the frontier of AI: running the world's most advanced models at radically higher speed and lower cost. We have an exceptional team across hardware and software capable of bringing about this change, and we are growing fast to meet demand and deliver our product at scale.

The frontier of AI is no longer a research problem. The tasks AI can complete are doubling in complexity every six to seven months, and the tokens required to complete them are scaling with it. Sequential reasoning &mdash; the kind that can't be parallelised away &mdash; means the internal clock speed of inference systems is the critical constraint. What stands between where we are today and the future potential of AI isn't smarter algorithms; it's the hardware to run them fast enough to matter.

Today's chips are hitting their wall. We're building the ones that don't.

Founded 2022 &middot; 110+ people and growing &middot; London &amp; Bristol &middot; Heart of the UK's frontier AI ecosystem

The Role

This is an early-career role for someone who wants to be at the point where hardware decisions get made &mdash; before RTL is written, before a floorplan exists, before the constraints are locked. Pre-silicon modelling is where architecture happens: where the questions are biggest, the trade-offs are hardest, and the answers have the most leverage.

Our ideal candidate has 0&ndash;3 years of experience, including recent graduates.

As a Graduate Modelling Engineer you will work within the modelling team, sitting at the intersection of hardware architecture, software systems, and ML inference. You will collaborate closely with colleagues across RTL design, verification, physical design, and system architecture &mdash; contributing to the decisions that shape the chip from the earliest stages of development through to tape-out.

We are not looking for someone from one specific background. Whether you come from a software and architecture route, a verification background, or have hands-on hardware design experience, what matters is that you are curious about how all the pieces fit together and motivated to work at the level where they connect.

At Fractile, we value ideas from everyone, regardless of title or tenure. You will be joining a culture where your curiosity is encouraged, your input matters, and there is real room to grow.

What You'll Do
<ul>
<li>Build and run functional and performance models of processor and accelerator microarchitecture, in C++ using SystemC.</li>
<li>Explore architectural trade-offs &mdash; cache sizing, memory bandwidth, datapath design, pipeline structure &mdash; and translate the results into clear guidance for the wider team.</li>
<li>Work with the verification team to develop functional models of hardware blocks that can be used both for simulation and as a reference for RTL checking.</li>
<li>Learn how ML inference workloads behave at the hardware level and what architectural choices serve them best.</li>
<li>Contribute to the simulation and tooling infrastructure that the architecture team depends on.</li>
<li>Engage in architecture discussions and bring the modelling perspective into decisions that span hardware and software.</li>
</ul>
The Mindset We Look For
<ul>
<li>A software mindset applied to hardware problems &mdash; or a hardware mindset with a desire to work upstream.</li>
<li>The desire to be in a high-impact role within a small, focused team.</li>
<li>Eagerness to improve working practices and build connections between hardware and software teams.</li>
<li>Detail-focused, with rigour as the baseline for all work.</li>
<li>Humility and a genuine desire to keep learning.</li>
<li>Comfortable in a fast-paced, open, and collaborative environment.</li>
</ul>
What We're Looking For

Background
<ul>
<li>A degree (BEng, MEng, MSc, or equivalent) in Computer Engineering, Electrical Engineering, Computer Science, Physics, or a related field &mdash; with a strong academic record and genuine interest in how hardware systems work.</li>
<li>Graduating in 2025 or 2026, or recently graduated &mdash; industry experience is not required.</li>
</ul>
Core Technical Skills
<ul>
<li>Strong software skills &mdash; C++ at a level where you have written something non-trivial. A simulator, a testbench framework, a data processing tool &mdash; something with real complexity.</li>
<li>Computer architecture fundamentals: cache hierarchies, pipeline stages, memory systems, instruction-level parallelism.</li>
<li>An ability to read, understand, and reason about digital hardware &mdash; whether that comes from RTL design, verification, or architectural coursework.</li>
</ul>
Desirable &mdash; Any Combination Is Welcome
<ul>
<li>Architecture simulation experience &mdash; gem5, custom cycle-accurate simulators, or equivalent, even from a university project.</li>
<li>Pre-silicon verification skills: testbench development, functional modelling of hardware blocks, stimulus creation, coverage closure.</li>
<li>Transaction-Level Modelling &mdash; in SystemC, UVM, or another methodology.</li>
<li>SystemVerilog &mdash; whether used for RTL design, verification, or both.</li>
<li>FPGA or ASIC implementation experience &mdash; at any level, including academic projects and tapeouts.</li>
<li>Familiarity with open-source silicon tools: Cocotb, Verilator, Icarus Verilog, gem5.</li>
<li>Exposure to ML accelerator architectures: systolic arrays, dataflow execution, custom ISA design.</li>
</ul>
Who Thrives Here

The candidates who stand out to us tend to have done more than their coursework required &mdash; a cache coherence simulator built from scratch to really understand MOESI, a testbench written because the existing one was not good enough, a RISC-V core implemented on FPGA for the satisfaction of seeing it run, or a decompiler for a game's custom bytecode because the problem was interesting. The project does not need to be large or polished. What it tells us is that you are genuinely engaged with this material.

We welcome applicants from across the hardware and software spectrum. If you have a verification background and want to move closer to architecture, this role gives you that path. If you have been working in physical design and want to understand the modelling decisions that drive the constraints you implement, this is where that knowledge becomes directly useful. If you are coming from a software and architecture route and want to see your simulations translate into real silicon, you will find that here too.

You do not need a prior industry role. Strong final-year or MSc project work, open-source contributions, or independent projects are equally compelling.

How We Work
<ul>
<li>Ownership and autonomy &mdash; you will have full agency to drive your work forward.</li>
<li>Rapid iteration &mdash; we work directly with leadership to move from idea to hardware on ambitious timelines.</li>
<li>Full-stack collaboration &mdash; hardware, software and modelling teams work closely together to create a product with generational impact.</li>
<li>A team-first mindset &mdash; the best idea gets shipped, regardless of where it comes from.</li>
</ul>
Why Fractile
<ul>
<li>Hybrid working &mdash; 2&ndash;3 days in our London (Farringdon) and Bristol offices.</li>
<li>Competitive graduate salary and meaningful equity from day one.</li>
<li>Structured mentorship within a small, high-calibre engineering team &mdash; you will work directly with experienced chip architects and modelling engineers, not sit in a graduate programme.</li>
<li>Modern, open offices with a collaborative, problem-solving culture built on deep curiosity, entrepreneurial initiative, and technical fluency.</li>
<li>We believe the hardest problems get solved by the broadest range of minds. We actively encourage applications from underrepresented groups in hardware and software engineering.</li>
</ul>
Export Control &amp; Security Clearance

Certain roles may involve working on technologies subject to export restrictions. Applicants may be required to undergo additional eligibility checks to ensure compliance with applicable law. We will be transparent about this throughout the hiring process.</div>

Graduate Modelling Engineer (Graduate and Early Career)

<div>
 Bristol or London
 
 
 Hybrid: Three days on-site
 
 
 Fractile is building silicon, systems and software which will redefine the frontier of AI: running the world&rsquo;s most advanced models at radically higher speed and lower cost. We have an exceptional team across hardware and software capable of bringing about this change, and we are growing fast to meet demand and deliver our product at scale.
 
 
 We&rsquo;re looking for an engineer who wants to own Bazel at scale and build the tooling that powers every part of Fractile, from ML models to kernel drivers to hardware simulation.This is a greenfield Bazel role in a fast-growing deep-tech company building a new class of ML hardware and software from first principles.
 
 
 
 What You Will Work On
 
 
 
 <ul>
 <li>
 Designing and owning Bazel rules and extensions
 </li>
 <li>
 Scaling our monorepo as we grow across Python, C++, Rust, SystemVerilog and ML workloads
 </li>
 <li>
 Creating reproducible, multi-language build pipelines
 </li>
 <li>
 Optimising CI performance across large compute clusters
 </li>
 <li>
 Defining the developer experience for every engineer at Fractile
 </li>
 <li>
 Contributing upstream to Bazel rules we depend on
 
 
 </li>
 </ul>
 
 Why this role is unique?
 
 
 
 No legacy &mdash; you&rsquo;re building the Bazel ecosystem from scratch
 
 
 Extreme variety &mdash; ML, compilers, kernel drivers, simulators, hardware verification
 
 
 High impact &mdash; your work becomes the backbone of the entire engineering organisation
 
 
 Deep collaboration with Simulation, Runtime, and Hardware teams
 
 
 Real ownership &mdash; you shape how Fractile builds software
 
 
 
 What We Are Looking For
 
 
 
 <ul>
 <li>
 5+ years in software or infrastructure engineering
 </li>
 <li>
 3+ years with build systems
 </li>
 <li>
 Strong experience with Bazel
 </li>
 <li>
 Python scripting and automation
 </li>
 <li>
 Experience with CI/CD for large-scale products
 
 
 </li>
 </ul>
 Bonus: ML pipelines, GitHub Actions, multi-language build systems, containers
 
 
 
 About Us
 
 
 
 <ul>
 <li>
 Founded in 2022, team of 100+ which is expanding rapidly
 </li>
 <li>
 Modern, open offices in London and Bristol
 </li>
 <li>
 Collaborative, problem-solving culture built on deep curiosity, entrepreneurial initiative and technical fluency
 
 
 </li>
 </ul>
 
 Export control and security clearance
 
 
 
 Certain roles may involve working on technologies subject to export restrictions. Applicants may be required to undergo additional eligibility checks to ensure compliance with applicable law.
</div>

DevOps Engineer (Junior/Mid-Level) - Bazel Monorepo

<div><h1 class="jobSectionHeader">Developer Experience Engineer</h1>

Fractile &middot; London or Bristol &middot; Full-time &middot; Hybrid
<h2 class="jobSectionHeader">
About Fractile</h2>

Fractile is building silicon, systems, and software that redefine the frontier of AI &mdash; running the world's largest language models at radically higher speed and lower cost. Founded in 2022, our 100+ person team spans hardware and software, and we're growing fast.

But revolutionary hardware only matters if developers can get their models running on it quickly and predictably. That's where you come in.
<h2 class="jobSectionHeader">
The Role</h2>

We're looking for Developer Experience Engineers to design and build the tooling and workflows that companies will use to optimise their large language models on Fractile's next-generation inference hardware.

This is a role that sits at the intersection of deep systems knowledge and genuine empathy for developers. You'll shape how the outside world experiences Fractile &mdash; from a customer's first quickstart guide through to advanced performance profiling. You'll also be the voice of that external developer inside the company, turning real deployment pain into roadmap priorities.

You'll work in a tight hardware-software co-design loop alongside ML compiler, runtime, systems software, and silicon engineers &mdash; influencing APIs and abstractions before they're set in stone.
<h2 class="jobSectionHeader">
What You'll Do</h2>
<ul><li>Design and build the tools customers use to run, optimise, and monitor large language models on Fractile hardware</li>
<li>Build interfaces to diagnostic, profiling, and observability tools that help developers understand performance, debug issues, and optimise deployments</li>
<li>Write documentation, quickstarts, reference examples, and tutorials that define a developer's first and lasting impression of our platform</li>
<li>Act as the voice of the external developer inside Fractile &mdash; translating real deployment pain into roadmap priorities</li>
<li>Collaborate with ML compiler, runtime, systems software, and silicon teams to shape APIs and abstractions early in the design process</li>
</ul><h2 class="jobSectionHeader">What We're Looking For</h2>

We care about depth of knowledge, empathy for developers, and a genuine drive to make complex things feel simple. You'll be a strong fit if you have:
<ul>
<li>Strong software engineering fundamentals and experience building developer-facing tooling, SDKs, APIs, or platforms that other engineers depend on</li>
<li>Excellent Python skills, with solid experience in one or more systems languages such as Rust, C++, or Go</li>
<li>A good understanding of modern ML workloads and the practical challenges of deploying large language models to production</li>
<li>An instinct for reducing the number of steps, surprises, and rough edges between a user and a working result</li>
<li>A Computer Science, Electronic Engineering, Maths, Physics, or related degree, and 5+ years of industry experience</li>
</ul>
Bonus Points

These aren't requirements, but they'd make you stand out:
<ul>
<li>Experience with inference serving stacks (vLLM, SGLang, TensorRT-LLM, Triton) or ML compiler and runtime toolchains</li>
<li>Experience working with GPUs, TPUs, or other ML accelerators</li>
<li>A track record of contributing to or maintaining open source developer tools or ML ecosystem projects</li>
<li>Experience writing technical documentation and developer education content</li>
<li>Prior startup or small-team experience</li>
</ul><h2 class="jobSectionHeader">How We Work</h2>
<ul><li>Ownership and autonomy &mdash; you'll have real agency to drive your work forward</li>
<li>Rapid iteration &mdash; we work directly with leadership to move from idea to product on ambitious timelines</li>
<li>Full-stack collaboration &mdash; hardware, software, silicon, and modelling teams work closely together</li>
<li>Hybrid working: 3 days onsite (London or Bristol), 2 days remote</li>
<li>A team-first mindset &mdash; the best idea gets shipped, regardless of where it comes from</li>
</ul><h2 class="jobSectionHeader">Why Fractile</h2>
<ul><li>Shape how the world's developers experience next-generation AI hardware</li>
<li>A collaborative culture built on curiosity, initiative, and technical depth</li>
<li>Modern offices in London and Bristol &mdash; choose your base</li>
<li>Competitive salary and equity in a fast-growing company</li>
</ul><h2 class="jobSectionHeader">Export Control &amp; Security Clearance</h2>

Certain roles may involve working on technologies subject to export restrictions. Applicants may be required to undergo additional eligibility checks to ensure compliance with applicable law.

Fractile is committed to building a diverse and inclusive team. We welcome applications from people of all backgrounds and actively encourage candidates from underrepresented groups to apply.

Ready to apply? Send us your CV and a brief note on what excites you about this role.</div>

Developer Experience Engineer

<div><h1 class="jobSectionHeader">DevOps Engineer (Junior/Mid-Level) - Bazel Monorepo</h1>

Fractile &middot; London or Bristol &middot; Full-time
<h2 class="jobSectionHeader">About Fractile</h2>

Fractile is building silicon, systems, and software that will redefine the frontier of AI &mdash; running the world's most advanced models at radically higher speed and lower cost. Founded in 2022, our 100+ person team spans hardware and software, and we're growing fast to deliver our product at scale.

We're an exceptional team working on an exceptional problem. If you want to build infrastructure that powers the future of AI computing, you'll fit right in.
<h2 class="jobSectionHeader">
The Role</h2>

We're looking for a Build Systems Engineer to own Bazel at Fractile and build the tooling that underpins every part of what we do &mdash; from ML models and kernel drivers to hardware simulation and compilers. This is a greenfield role: no legacy systems, no inherited constraints. You'll be designing the Bazel ecosystem from scratch in a fast-growing deep-tech company.

Your work will become the foundation every engineer at Fractile builds on. That's the scope, and that's the opportunity.
<h2 class="jobSectionHeader">
What You'll Work On</h2>
<ul><li>Design and own Bazel rules and extensions across the stack</li>
<li>Scale our monorepo as we grow across Python, C++, Rust, SystemVerilog, and ML workloads</li>
<li>Create reproducible, multi-language build pipelines</li>
<li>Optimise CI performance across large compute clusters</li>
<li>Define the developer experience for every engineer at Fractile</li>
<li>Contribute upstream to Bazel rules we depend on</li>
</ul><h2 class="jobSectionHeader">Why This Role Stands Out</h2>
<ul><li>No legacy &mdash; you're building the Bazel ecosystem from scratch</li>
<li>Extreme variety &mdash; ML, compilers, kernel drivers, simulators, hardware verification</li>
<li>High impact &mdash; your work becomes the backbone of the entire engineering organisation</li>
<li>Deep collaboration with Simulation, Runtime, and Hardware teams</li>
<li>Real ownership &mdash; you shape how Fractile builds software</li>
</ul><h2 class="jobSectionHeader">What We're Looking For</h2>

You'll be a strong fit if you have:
<ul>
<li>5+ years in software or infrastructure engineering</li>
<li>3+ years working with build systems</li>
<li>Strong hands-on experience with Bazel</li>
<li>Python scripting and automation skills</li>
<li>Experience with CI/CD for large-scale products</li>
</ul>
Bonus Points

These aren't requirements, but they'd make you stand out:
<ul>
<li>Experience with ML pipelines</li>
<li>GitHub Actions or similar CI tooling</li>
<li>Multi-language build systems</li>
<li>Container-based build environments</li>
</ul><h2 class="jobSectionHeader">Why Fractile</h2>
<ul><li>Work on genuinely novel problems at the frontier of AI hardware</li>
<li>A collaborative culture built on curiosity, initiative, and technical depth</li>
<li>Hybrid working: 3 days onsite (London or Bristol), 2 days remote</li>
<li>Modern offices in London and Bristol &mdash; choose your base</li>
<li>Competitive salary and equity in a fast-growing company</li>
</ul><h2 class="jobSectionHeader">Export Control &amp; Security Clearance</h2>

Certain roles may involve working on technologies subject to export restrictions. Applicants may be required to undergo additional eligibility checks to ensure compliance with applicable law.

Fractile is committed to building a diverse and inclusive team. We welcome applications from people of all backgrounds and actively encourage candidates from underrepresented groups to apply.

Ready to apply? Send us your CV and a brief note on what excites you about this role.</div>

Join Fractile and explore 4   exciting career opportunities. They're hiring for various roles with options for remote or on-site work. Apply today and become part of their innovative team.

Fractile

About Company

Graduate Modelling Engineer (Graduate and Early Career)

DevOps Engineer (Junior/Mid-Level) - Bazel Monorepo

Developer Experience Engineer

DevOps Engineer (Junior/Mid-Level) - Bazel Monorepo