Research Engineer / Research Scientist, Remote Compute Accounting

AI Safety; Greater London; Hybrid; GBP 80,000 - 120,000; Full time

Benefits offered by this job

Visa sponsorship in the UK

Competitive benefits and leave policy

Job summary

SASH is hiring for a remote role in the UK/Global, focusing on verification of AI datacenters. You will design and run memory- and compute-driven challenge protocols, benchmark accelerators, and study how to reveal undeclared workloads. Collaboration with cryptographers and hardware-security experts is expected, with opportunities to publish results.

The team combines technical measurement with AI policy insight, and the role offers visa sponsorship in the UK and a flexible remote arrangement.

Qualifications

• Experience in GPU performance measurement and kernels.
• Ability to design and run hardware-oriented verification experiments.
• Experience with memory bandwidth and accelerator architectures.

Responsibilities

• Design challenge protocols for verification of AI datacenters.
• Measure real accelerators under adversarial conditions.
• Write and optimize kernels for benchmarking workloads.
• Characterise memory bandwidth limits and compute capabilities.
• Publish results and share findings with colleagues.

Skills

GPU performance

Systems measurement

Kernels

Memory hierarchies

Distributed timing

Cryptography background

Adversary modelling

Low-level accelerator programming

LLM inference internals

Tools

CUDA

Job description

The team

Some of the most consequential decisions of the AI era will depend on answering one question: can we verify what is happening inside AI datacenters? Answering it could unlock international cooperation, help countries protect their sovereignty, and enable trustworthy adoption of AI in high-stakes industries. Building tools that can earn trust across borders is an urgent technical and political challenge.

SASH’s Verification team builds and tests tools to verify agreements about AI. We prototype new verification mechanisms, lead international research collaborations, and work with policymakers around the world to show what these tools can do and inform how they’re used.

You’d join a small team combining technical expertise with international AI policy experience. Our technical team is led by Pascal Berrang, an Associate Professor at University of Birmingham, and brings experience from the Singapore Government. Our policy team brings experience from Oxford and the Centre for the Governance of AI, while our partners include experts from the Future of Life Institute and the University of Oxford.

The problem

The hardest question in verification is not whether a datacenter is running the model it says it is. It is whether it is also running something else. A cluster can serve declared inference all day and train an undeclared model on the capacity left over.

We are interested in software-only approaches to this problem. If a verifier can keep a cluster's accelerators demonstrably occupied (i.e., their high-bandwidth memory holding the state they claim to hold, their compute answering challenges that cannot be faked or precomputed in advance), then there is no spare capacity for an undeclared training run. Physics supplies the lever: information cannot travel faster than light, and some computations cannot be performed faster than the hardware allows, so the time a cluster takes to answer is itself evidence about what hardware it has and what that hardware is doing.

The nearest concrete version is a memory-state challenge protocol. The prover commits frequently to workload checkpoints, the verifier fires N unique nonces simultaneously, and each device must return a function of its claimed memory state within a deadline (a function designed to demand serious memory bandwidth and matrix multiplication). Round-trip times are recorded and a random sample is proven genuine. A related family, proof of useful work, pushes further: the declared workload's own computation becomes the evidence, so the accounting costs almost nothing to produce.

Compression is one of the open questions: weights or a KV cache engineered for fast lossless decompression would let a prover reconstruct state it was not actually holding, freeing the hardware for whatever else it wanted to do. Showing that workload state cannot be decompressed inside the challenge window, or modifying workloads so that it cannot, would unlock the approach. Beyond that, a prover may hold secret memory capacity in error-correcting-code cells or overprovisioned regions; the challenge has to be designed so honest response time stays feasible; and the deadline has to be short enough to block cheating while surviving network latency and kernel launch times.

Your work

You would own the question of how much of a cluster can be accounted for from outside it, and how little room can be left over.

Concretely, that means designing challenge protocols and then measuring whether real accelerators can satisfy them: microbenchmarking, writing challenge kernels, characterising what high-bandwidth memory can and cannot do under adversarial conditions, and deciding whether the numbers support a claim someone could stake an agreement on. The work sits between two disciplines: measurement is GPU performance engineering, the rest is constructing a hardness assumption and then trying to break it. We expect most candidates to be strong on one side and curious about the other. You'd work alongside cryptographers and hardware-security colleagues, and you'd be expected to publish, including when the answer is that something does not work.

Representative projects

• Implement a candidate challenge function and characterise honest-response latency across real cluster topologies.

• Establish how much spare capacity a cluster could retain while still passing every challenge, then design that margin down.

• Run the adversarial compression study: how much of a frontier model's weights or KV cache can be losslessly decompressed inside a realistic challenge window, and how much hardware does that free up?

• Design and evaluate post-training that measurably raises the cost of compressing weights, without measurably hurting the model.

• Quantify how much memory a prover could plausibly hide, and what protocol changes make hiding it useless.

• Extend the approach from memory occupancy to compute, through proof-of-useful-work schemes where the declared workload's own computation carries the evidence.

• Take the protocol end to end against a live inference cluster and write up what broke.

• Design a red-team/blue-team competition for the protocol: cheap to run, because they need no new hardware.

• Red-team our own timing assumptions.

About you

We are hiring this role at a range of levels. We care more about ability and trajectory than years of experience.

You may be a good fit if you:

• Have GPU performance or systems measurement experience (kernels, microbenchmarks, memory hierarchies, distributed timing) or a cryptographic background and a real appetite for getting your hands on hardware.

• Are rigorous about measurement, including about the ways your own measurement can be fooled.

• Can hold an adversary in your head while you optimise something.

• Are comfortable working on a protocol that may turn out not to work, and saying so in public if it does not.

• Thrive in ambiguous, early-stage environments where defining the problem is part of the job.

Strong candidates may also have:

• CUDA or equivalent low-level accelerator programming.

• Compression, information theory, or model quantisation experience.

• Background in timing-based protocols, proofs of space or time, or distance bounding.

• Experience characterising hardware you don’t have documentation for.

• Familiarity with LLM inference internals: batching, KV cache management, scheduling.

Role Logistics & Benefits

Location:

• This is a remote role that can be based in Singapore, the UK, or remotely.

• For candidates interested in relocating, SASH can provide visa sponsorship in the UK.

• Our team is globally distributed, so remote team members should be comfortable maintaining some working-hour overlap with colleagues across regions.

Compensation:

Our compensation takes location, experience, and level into account. Our compensation takes location, experience, and level into account. Salaries above the stated range may be available for exceptional candidates.

Benefits:

• Competitive benefits and leave policies.