ML/AI Research Engineer — Agentic AI Lab (Founding Team) Location: San Francisco Bay Area Type: Full-Time Compensation: Competitive salary + meaningful equity (founding tier) Backed by 8VC, we're building a world-class team to tackle one of the industry’s most critical infrastructure problems.

About the Role We’re designing the future of enterprise AI infrastructure — grounded in agents, retrieval-augmented generation (RAG), knowledge graphs, and multi-tenant governance. We’re looking for an ML/AI Research Engineer to join our AI Lab and lead the design, training, evaluation, and optimization of agent-native AI models. You'll work at the intersection of LLMs, vector search, graph reasoning, and reinforcement learning — building the intelligence layer that sits on top of our enterprise data fabric. This isn’t a prompt engineer role. It’s full-cycle ML: from data curation and fine-tuning to evaluation, interpretability, and deployment — with cost-awareness, alignment, and agent coordination all in scope.

Core Responsibilities Fine-tune and evaluate open-source LLMs (e.g. LLaMA 3, Mistral, Falcon, Mixtral) for enterprise use cases with both structured and unstructured data

Build and optimize RAG pipelines using LangChain, LangGraph, LlamaIndex, or Dust — integrated with our vector DBs and internal knowledge graph

Train agent architectures (ReAct, AutoGPT, BabyAGI, OpenAgents) using enterprise task data

Develop embedding-based memory and retrieval chains with token-efficient chunking strategies

Create reinforcement learning pipelines to optimize agent behaviors (e.g. RLHF, DPO, PPO)

Establish scalable evaluation harnesses for LLM and agent performance, including synthetic evals, trace capture, and explainability tools

Contribute to model observability, drift detection, error classification, and alignment

Optimize inference latency and GPU resource utilization across cloud and on-prem environments

Desired Experience Model Training: Deep experience fine-tuning open-source LLMs using HuggingFace Transformers, DeepSpeed, vLLM, FSDP, LoRA/QLoRA

Worked with both base and instruction-tuned models; familiar with SFT, RLHF, DPO pipelines

Comfortable building and maintaining custom training datasets, filters, and eval splits

Understand tradeoffs in batch size, token window, optimizer, precision (FP16, bfloat16), and quantization

RAG + Knowledge Graphs: Experience building enterprise-grade RAG pipelines integrated with real-time or contextual data

Familiar with LangChain, LangGraph, LlamaIndex, and open-source vector DBs (Weaviate, Qdrant, FAISS)

Experience grounding models with structured data (SQL, graph, metadata) + unstructured sources

Bonus: Worked with Neo4j, Puppygraph, RDF, OWL, or other semantic modeling systems

Agent Intelligence: Experience training or customizing agent frameworks with multi-step reasoning and memory

Understand common agent loop patterns (e.g. Plan→Act→Reflect), memory recall, and tools

Familiar with self-correction, multi-agent communication, and agent ops logging

Optimization: Strong background in token cost optimization, chunking strategies, reranking (e.g. Cohere, Jina), compression, and retrieval latency tuning

Experience running models under quantized (int4/int8) or multi-GPU settings with inference tuning (vLLM, TGI)

Preferred Tech Stack LLM Training & Inference : HuggingFace Transformers, DeepSpeed, vLLM, FlashAttention, FSDP, LoRA

Agent Orchestration : LangChain, LangGraph, ReAct, OpenAgents, LlamaIndex

Vector DBs : Weaviate, Qdrant, FAISS, Pinecone, Chroma

Graph Knowledge Systems : Neo4j, Puppygraph, RDF, Gremlin, JSON-LD

Storage & Access : Iceberg, DuckDB, Postgres, Parquet, Delta Lake

Evaluation : OpenLLM Evals, Trulens, Ragas, LangSmith, Weight & Biases

Compute : Ray, Kubernetes, TGI, Sagemaker, LambdaLabs, Modal

Languages : Python (core), optionally Rust (for inference layers) or JS (for UX experimentation)

Soft Skills & Mindset Startup DNA: resourceful, fast-moving, and capable of working in ambiguity

Deep curiosity about agent-based architectures and real-world enterprise complexity

Comfortable owning model performance end-to-end: from dataset to deployment

Strong instincts around explainability, safety, and continuous improvement

Enjoy pair-designing with product and UX to shape capabilities, not just APIs

Why This Role Matters This role is foundational to our thesis: that agents + enterprise data + knowledge modeling can create intelligent infrastructure for real-world, multi-billion-dollar workflows. Your work won’t be buried in research reports — it will be productionized and activated by hundreds of users and hundreds of thousands of decisions. If this is your dream role - we would love to hear from you.