Senior ML Systems Engineer - Simulations in London

We are looking for a Senior ML Systems Engineer to build and validate simulation infrastructure for large-scale machine learning systems.

This role focuses on modelling the compute and communication behaviour of systems used for ML training and inference, and using simulation to guide architecture, performance optimization, and capacity planning.

The ideal candidate combines strong systems experience with hands-on experience in measurement, benchmarking, and performance analysis of modern ML systems.

What You'll Do

• Build simulation models for compute, memory, interconnect, and communication behavior in ML systems.
• Develop tools to simulate performance for training and inference workloads.
• Model distributed execution across accelerators, hosts, and network fabrics, including collectives, synchronization, and communication bottlenecks.
• Use simulation and analytical modelling to evaluate tradeoffs, identify bottlenecks, and guide system design.
• Run performance experiments and benchmarks on real ML systems to calibrate and validate simulation models.
• Analyze end-to-end performance, including throughput, latency, scaling efficiency, utilization, and cost/performance tradeoffs.
• Partner with hardware/software/Networking/ML teams to align simulation with real workloads and constraints.
• Create reproducible benchmarking methodologies across models, system configurations, and compare against real system measurements to prove validity.
• Communicate findings through technical reports and design recommendations.

Qualifications

Required

• Master's, or Ph D in Computer Science, Electrical Engineering, Computer Engineering, or a related field.
• Strong experience in ML systems, distributed systems, performance engineering, computer architecture, or simulation.
• Understanding of systems used for machine learning training and inference.
• Experience analyzing compute, communication, and memory behavior in large-scale ML systems.
• Hands-on experience with performance benchmarking, profiling, and measurement of ML systems.
• Experience with distributed training concepts such as data parallelism, tensor/model parallelism, pipeline parallelism, collectives, and synchronization overheads.
• Proficiency in one of the following Python, C++, or Rust.
• Strong analytical skills and the ability to connect simulation results to real system behavior.

Preferred

• Experience with system performance modelling, network simulation, or architecture evaluation tools. - this background is ideal
• Familiarity with accelerator-based systems such as GPUs, TPUs, or custom ML hardware.
• Experience with Py Torch, JAX, Tensor Flow, NCCL, XLA, CUDA, or similar tools.
• Knowledge of interconnect and networking technologies such as Infini Band, Ethernet/RDMA, NVLink, PCIe, or equivalent.
• Experience evaluating both training throughput and inference latency/serving efficiency.
• Background in workload characterization, trace-driven simulation, or model calibration.
• Ability to work across hardware and software boundaries in a cross-functional environment.

What Success Looks Like

• Build simulation models that accurately predict performance trends and inform architectural decisions.
• Identify compute and communication bottlenecks in ML training and inference systems.
• Correlate simulation outputs with real-world benchmark data.
• Improve system efficiency, scalability, and cost effectiveness through data-driven insights.
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