Research Engineer (LLM Performance), London

Isomorphic Labs is applying frontier AI to help unlock deeper scientific insights, faster breakthroughs, and life-changing medicines with an ambition to solve all disease. The future is coming. A future enabled and enriched by the incredible power of machine learning. A future in which diseases are curtailed or cured starting with better and faster drug discovery. Come and be part of an interdisciplinary team driving groundbreaking innovation and play a meaningful role in contributing towards us achieving our ambitious goals, while being a part of an inspiring and collaborative culture. The world we want tomorrow is the one we’re building today. It starts with the culture at this company. It starts with you. About Iso Isomorphic Labs (IsoLabs) was launched in 2021 to advance human health by building on and beyond the Nobel-winning AlphaFold system. Since then, our interdisciplinary team of drug discovery experts and machine learning specialists has built powerful new predictive and generative AI models that accelerate scientific discovery at digital speed. Our name comes from the belief that there is an underlying symmetry between biology and information science. By harnessing AI’s powerful capabilities, we can use it to model complex biological phenomena to help design novel molecules, anticipate how drugs will perform and develop innovative medicines to treat and cure some of the world’s most devastating diseases. We have built a world-leading drug design engine comprising AI models that are capable of working across multiple therapeutic areas and drug modalities. We are continually innovating on model architecture and developing cutting-edge capabilities to advance rational drug design. Every day, and with each new breakthrough, we’re getting closer to the promise of digital biology, and achieving our ambitious mission to one day solve all disease with the help of AI. Your impact This is an exciting opportunity for you to contribute to frontier research at the intersection of AI and drug design. Working in a highly creative, iterative environment, you will join the model performance and scaling team, where you will partner with scientists and engineers to scale foundational models that will transform the biopharmaceutical world as we know it. You will draw upon your existing engineering experience whilst learning from those around you, to apply novel techniques and ideas to newly encountered model and systems performance optimizations, as well as machine learning, computational biology and chemistry problems. What you will do • Implement and optimize LLM post-training methods at scale on frontier models. • Collaborate with research teams to translate new methods into production-ready systems. • Relentlessly prioritize and execute on performance optimization opportunities. • Evaluate and deploy frameworks for supervised fine-tuning, reinforcement learning and LLM evaluation. • Diagnose and fix performance bottlenecks and communication overhead in distributed training and inference systems. • Deploy low-precision methods to balance performance with accuracy, impacting real world drug design programs. Skills and qualifications Essential: • Significant experience with large scale distributed training of LLMs. • Experience with deep learning ML frameworks (either JAX or PyTorch). • Knowledge of parallelism strategies and collective communication libraries (e.g. NCCL). • Good understanding of GPU architectures. Reasoning about performance concepts is more important than writing kernels from scratch • Excellent collaboration skills. Nice to have: • Experience with general LLM serving stacks. • Knowledge of XLA, Triton, Pallas, CUDA or similar accelerator DSLs / compilers. • Experience with optimising ML a