Level

Featherless AI

AI Researcher — Inference Optimization

Featherless AI is hiring an AI Researcher — Inference Optimization for a remote role. Level rates it ; you can apply on Featherless AI.

Level's read on this job

  • Level rates this role Builds AI ●●●●: the job is building AI systems.
  • The posting lists this role as remote.
  • Tools and skills the posting cites include vLLM and PyTorch.
  • Level lists 16 other open roles at Featherless AI.

AI in this role

vllmpytorch

Role Overview

We are seeking an AI Researcher with deep experience in inference optimization to design, evaluate, and deploy high-performance inference systems for large-scale machine learning models. You will work at the intersection of model architecture, systems engineering, and hardware-aware optimization, improving latency, throughput, and cost efficiency across real-world production environments.

Key Responsibilities

  • Research and develop techniques to optimize inference performance for large neural networks.

  • Improve latency, throughput, memory efficiency, and cost per inference.

  • Design and evaluate model-level optimizations (quantization, pruning, KV-cache optimization, architecture-aware simplifications).

  • Implement systems-level optimizations (dynamic batching, kernel fusion, multi-GPU inference, prefill vs decode optimization).

  • Benchmark inference workloads across hardware accelerators.

  • Collaborate with engineering teams to deploy optimized inference pipelines.

  • Translate research insights into production-ready improvements.

Required Qualifications

  • Strong background in machine learning, deep learning, or AI systems.

  • Hands-on experience optimizing inference for large-scale models.

  • Proficiency in Python and modern ML frameworks (e.g., PyTorch).

  • Experience with inference tooling (e.g., Triton, TensorRT, vLLM, ONNX Runtime).

  • Ability to design experiments and communicate results clearly.

Preferred / Nice-to-Have Qualifications

  • Experience deploying production inference systems at scale.

  • Familiarity with distributed and multi-GPU inference.

  • Experience contributing to open-source ML or inference frameworks.

  • Authorship or co-authorship of peer-reviewed research papers in machine learning, systems, or related fields.

  • Experience working close to hardware (CUDA, ROCm, profiling tools).

What Success Looks Like

  • Measurable gains in latency, throughput, and cost efficiency.

  • Optimized inference systems running reliably in production.

  • Research ideas successfully translated into deployable systems.

  • Clear benchmarks and documentation that inform product decisions.

Relevant Research Areas (Bonus)

  • Long-context inference optimization

  • Speculative decoding

  • KV-cache compression and paging

  • Efficient decoding strategies

  • Hardware-aware inference design

How we rate this

AI Researcher — Inference Optimization at Featherless AI rates 100 out of 100 for how much of the daily work is AI. That makes it Builds AI (AI Level 4 of 4). The level is about AI in the job, not seniority.

Classification

Builds AI. The job is building AI systems.

  1. ●●●● Builds AI80 to 100
  2. ●●●○ Works on AI60 to 79
  3. ●●○○ Uses AI40 to 59
  4. ●○○○ Little AI0 to 39

Levels come from how often the tools, models and workflows of the role are named in the posting itself. Read the description and count the AI tools, models and workflows it names.

Prepare for this job

Built from this posting and from similar jobs on Level.

Skills and AI tools this role asks for

vLLMPyTorch

Questions you could be asked

  1. What's a project where you used vLLM hands-on?
  2. Walk me through how you've used PyTorch in your day-to-day work.
  3. How would you decide a model or AI system is ready to ship?
  4. Tell me about a time a model underperformed in production. How did you find out, and what did you change?

Adapt your resume

  • List these exact terms on your resume: vLLM and PyTorch. An applicant tracking system matches the wording, not the idea.
  • Attach one line of real, concrete experience to at least one of them. A tool named with nothing behind it rarely survives a human read.
  • Lead with what you built, trained or shipped. This role is judged on the AI system itself, not the tools around it.

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