Senior Machine Learning Engineer, LLM Inference Optimization

Lever, Inc.; France; Sur place; EUR 90 000 - 130 000; Plein temps

Avantages offerts par ce poste

Competitive compensation

Career growth opportunities

Flexible work environment

Ownership over technical work

International team

Impactful AI infrastructure projects

Résumé du poste

Lever, Inc. seeks a Senior Machine Learning Engineer to optimize LLM and VLM inference in a France-based role. You will drive optimizations from model artifacts through production, collaborating across kernel, platform, and research teams to reduce latency, increase throughput, and lower token cost.

The role demands hands-on experience with modern inference stacks and quantization-aware training, with a focus on measurable production improvements and robust benchmarking.

Qualifications

• Strong software engineering in Python and PyTorch.
• Hands-on experience deploying, operating, or optimizing LLM/VLM inference systems.
• Experience with modern inference stacks such as vLLM, SGLang, TensorRT-LLM, Triton, NVIDIA Dynamo, Ray Serve, KServe.
• Understanding of transformer inference bottlenecks: KV cache, attention, memory bandwidth, batching, parallelism, long-context serving.
• Ability to reason about latency, throughput, quality, resource use, and cost trade-offs.
• Experience diagnosing performance problems and translating findings into production improvements.
• Strong communication and collaboration with research, kernel, infrastructure, product, and customer teams.
• Experience with quantization-aware training, post-training quantization, FP8/INT8/INT4, and related optimizations is a plus.
• Familiarity with distillation, speculative decoding, multi-token prediction, or acceleration approaches is advantageous.

Responsabilités

• Own optimization initiatives for specific model families, customer endpoints, and inference serving backends.
• Evaluate inference engines and recommend practical serving configurations based on workload requirements.
• Diagnose and resolve model quality, performance, and reliability regressions during production rollouts.
• Optimize LLM and VLM endpoints for latency, throughput, memory efficiency, GPU utilization, model quality, and cost per token.
• Deploy, configure, benchmark, and extend modern inference engines like vLLM, SGLang, TensorRT-LLM, Triton, NVIDIA Dynamo, or equivalents.
• Build and productionize model-compression workflows including quantization and distillation.
• Implement advanced inference techniques like speculative decoding, KV-cache optimization, and disaggregated prefill/decode serving.
• Develop reproducible benchmark harnesses covering TTFT, tokens/sec per GPU, latency p95/p99, memory usage, and cost per token.
• Partner with GPU kernel and platform engineers to identify bottlenecks across model code and infrastructure.
• Investigate performance trade-offs and use benchmarks to guide optimizations.
• Produce design docs, performance reports, and rollout plans for internal and customer stakeholders.
• Contribute to safe, measurable production rollouts of inference improvements.

Connaissances

Python

PyTorch

Performance optimization

Quantization

Quantization-aware training

Inference systems

Benchmarking

Communication skills

Outils

vLLM

SGLang

TensorRT-LLM

Triton Inference Server

NVIDIA Dynamo

Ray Serve

KServe

CUDA

Description du poste

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Machine Learning Engineer, LLM Inference Optimization based in France.

As a Senior Machine Learning Engineer, you will drive the optimization of large language and vision-language model inference from model artifacts through production deployment. You will work across model internals, inference engines, serving architectures, and benchmarking to improve latency, throughput, memory efficiency, GPU utilization, reliability, and cost per token. This is a hands-on role focused on solving complex performance challenges and delivering measurable improvements to production systems. You will collaborate closely with kernel, platform, infrastructure, research, product, and customer-facing teams. Your work will involve evaluating serving configurations, diagnosing performance and quality regressions, and implementing advanced inference optimization techniques. You will also establish reproducible benchmarks and safe rollout practices for high-throughput AI workloads.

Accountabilities:

• Own optimization initiatives for specific model families, customer endpoints, and inference serving backends.
• Evaluate inference engines and recommend practical serving configurations based on workload requirements.
• Diagnose and resolve model quality, performance, and reliability regressions during production rollouts.
• Optimize LLM and VLM endpoints for latency, throughput, memory efficiency, GPU utilization, model quality, and cost per token.
• Deploy, configure, benchmark, and extend modern inference engines such as vLLM, SGLang, TensorRT-LLM, Triton Inference Server, NVIDIA Dynamo, or equivalent technologies.
• Build and productionize model-compression workflows, including quantization, quantization-aware training, distillation, low-bit serving, and accuracy recovery.
• Implement or integrate advanced inference techniques such as speculative decoding, draft models, KV-cache optimization, prefix caching, chunked prefill, continuous batching, and disaggregated prefill/decode serving.
• Develop reproducible benchmark harnesses covering TTFT, TPOT, tokens per second per GPU, p95/p99 latency, GPU memory usage, reliability, and cost per token.
• Partner with GPU kernel and platform engineers to identify bottlenecks across model code, kernels, runtimes, schedulers, gateways, and cluster infrastructure.
• Investigate performance trade-offs quantitatively and use benchmark results to guide optimization decisions.
• Produce clear design documentation, performance reports, rollout plans, and technical explanations for internal and customer-facing stakeholders.
• Contribute to safe, measurable, and reliable production rollouts of inference improvements.

Requirements:

• Strong software engineering skills in Python and PyTorch.
• Hands-on experience deploying, operating, or optimizing LLM, VLM, or high-throughput transformer inference systems.
• Practical experience with at least one modern inference stack, such as vLLM, SGLang, TensorRT-LLM, Triton Inference Server, NVIDIA Dynamo, Ray Serve, KServe, or an equivalent internal system.
• Strong understanding of transformer inference bottlenecks, including KV cache, attention mechanisms, memory bandwidth, batching, parallelism, and long-context serving.
• Ability to reason quantitatively about latency, throughput, model quality, resource utilization, and cost trade-offs.
• Experience diagnosing complex performance problems and translating findings into production improvements.
• Strong communication skills and the ability to collaborate effectively with research, kernel, infrastructure, product, and customer teams.
• Experience with quantization-aware training, post-training quantization, FP8, INT8, INT4, NVFP4, MXFP4, AWQ, GPTQ, SmoothQuant, or related optimization techniques is a plus.
• Familiarity with distillation, speculative decoding, EAGLE, Medusa, multi-token prediction, or other inference acceleration approaches is advantageous.
• Experience supporting agentic workloads involving tool calling, structured outputs, streaming APIs, high concurrency, or multi-step orchestration is a plus.
• Familiarity with CUDA or Triton is beneficial, even if the role is not primarily focused on kernel engineering.
• Contributions to open-source projects such as vLLM, SGLang, TensorRT-LLM, FlashInfer, LMCache, PyTorch, Triton, Ray, KServe, or related technologies are advantageous.
• Ability to work independently, take ownership, and operate effectively in a fast-moving technical environment.

Benefits:

• Competitive compensation.
• Career growth and continuous learning opportunities.
• Flexibility and significant ownership over technical work.
• Collaborative and innovative working environment.
• Opportunity to work on impactful AI infrastructure and inference optimization projects.
• Exposure to advanced LLM and VLM serving technologies and large-scale AI workloads.
• International environment with experienced engineering and AI teams.

We appreciate your interest and wish you the best!

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