CareerPlan

Principal Machine Learning Engineer, Applied AI

Cambridge, MA USA; San Francisco, CA USAFull-time$252k2026-10-07 → 2026-11-10

Core

Adapt Lila's AI models to customer-specific scientific needs by shaping frontier model capabilities into reliable workflows for evaluation and real-world use.

Role type

Principal Machine Learning Engineer (Applied AI)

Builds

Production-oriented ML systems, post-training pipelines, and evaluation loops for scientific workflows

Domain

Artificial Intelligence / Scientific Discovery

Deliverable

production ML models

Required skills

Model post-training (SFT, RLHF, DPO, PPO, GRPO), Evaluation system design, Python, PyTorch, Large Language Models, Multi-modal models, Agentic AI systems, Debugging complex model failures, Technical leadership

Preferred skills

RL post-training (RLHF, GRPO, tool-augmented RL), Model monitoring, Quality dashboards, MoE architectures, Mentoring engineers

Technologies

PyTorch, Python, SFT, RLHF, DPO, PPO, GRPO

Responsibilities

Lead post-training efforts to align model behavior with customer requirements; Build and run evaluation loops to measure model quality and reliability; Debug complex model failures using traces and scientific feedback; Partner with researchers to translate model advances into usable capabilities; Integrate model behavior into end-to-end product workflows; Mentor engineers and share reusable patterns for model adaptation.