Senior / Staff Machine Learning Engineer, Applied AI

Lila Sciences; San Francisco (CA); On-site; USD 180,000 - 298,000; Full time

Job summary

Lila Sciences is hiring a Senior / Staff Machine Learning Engineer, Applied AI, in San Francisco, CA. You will lead hands-on post-training, evaluation, and deployment-focused ML work to adapt frontier models to customer scientific workflows.

You will collaborate with AI researchers and software teams to turn advances into reliable, end-to-end product capabilities, debugging complex model failures and shaping model behavior through customer feedback.

Qualifications

• 1-2+ years post-training experience with SFT/RL methods and evaluation system design.
• Strong software engineering skills in Python and ML frameworks like PyTorch.
• Ability to debug high-stakes model behavior using data, traces, logs, and feedback.
• Deep familiarity with large language models, multi-modal models, or agentic AI systems.
• Clear communication skills to translate customer needs into technical approaches.

Responsibilities

• Close the last-mile gap between model capabilities and customer-specific scientific workflows.
• Run post-training work using SFT and RL to align model behavior with customer requirements and feedback.
• Run evaluation loops that measure model quality, reliability, and customer fit.
• Turn customer learnings and evaluation results into concrete model improvement cycles.
• Partner with AI researchers to translate model advances into reliable, usable capabilities.
• Work with Software to integrate model behavior into end-to-end product workflows.
• Debug complex model failures using traces, evaluations, customer context, and scientific feedback.

Skills

Post-training

Python

PyTorch

Model debugging

LLMs

Customer communication

Tools

SFT

RL (DPO/PPO/GRPO)

Job description

Senior / Staff Machine Learning Engineer, Applied AI

Cambridge, MA USA; San Francisco, CA USA

We are growing our Applied AI org and seeking a Senior / Staff Machine Learning Engineer, Applied AI with expertise in model post-training, evaluation, and production-oriented ML systems. You’ll shape how Lila’s AI models are adapted to customer-specific scientific needs, with a focus on turning frontier model capabilities into reliable workflows that can be evaluated, iterated and used in real customer contexts.

Applied AI sits at the intersection of AI Research, model engineering, and product deployment. The team partners closely with AI Researchers and Software teams to adapt Lila models to customer workflows, improve model quality through post training and driving how harness engineering shapes model behavior inside the product.

This is the right role for someone who wants to go deep on model adaptation and evaluation, take real ownership of hard technical problems, and grow into broader scope over time.

What You'll Be Building

• Apply hands-on expertise to close the last-mile gap between Lila's model capabilities and customer-specific scientific workflows.
• Run post-training work using approaches such as SFT and RL (DPO, PPO/GRPO) to align model behavior with customer-specific requirements and feedback.
• Run evaluation loops that measure model quality, reliability, and customer fit.
• Turn customer learnings, data signals, and evaluation results into concrete model improvement cycles.
• Partner with AI researchers to translate model advances into reliable, usable capabilities.
• Work with Software to integrate model behavior into end-to-end product workflows.
• Debug complex model failures using traces, evaluations, customer context, and scientific feedback.

What You'll Need to Succeed

• Minimum 1-2 years of hands-on post-training experience (SFT, RL methods such as DPO/PPO/GRPO) and evaluation system design, gained from having solved these problems many times before.
• Strong software engineering skills in Python and modern ML frameworks like PyTorch.
• A demonstrated ability to debug ambiguous, high-stakes model behavior quickly, using data, traces, logs, and qualitative feedback - the kind of judgment that only comes from having seen many failure modes before.
• Deep familiarity with large language models, multi-modal models, or agentic AI systems.
• Clear communication skills for translating customer needs into technical approaches, and for explaining complex model behavior to both technical and non-technical audiences.

Bonus Points For

• Experience adapting models for customer-facing or production workflows, ideally in scientific, technical, or data-intensive domains.
• Experience with RL post-training, such as RLHF, GRPO, or tool-augmented RL.
• Experience building evaluation harnesses, model monitoring, or quality dashboards.
• Experience training MoE architectures.
• A track record of mentoring engineers and being sought out as a go-to technical expert, rather than a people manager or strategy owner.

Compensation

We offer competitive base compensation with bonus potential and generous early-stage equity. Your final offer will reflect your background, expertise, and expected impact.

U.S. Benefits. Full-time U.S. employees receive a comprehensive benefits program including medical, dental, and vision coverage; employer-paid life and disability insurance; flexible time off with generous company wide holidays; paid parental leave; an educational assistance program; commuter benefits, including bike share memberships for office based employees; and a company subsidized lunch program.

International Benefits. Full-time employees outside the U.S. receive a comprehensive benefits program tailored to their region. USD salary ranges apply only to U.S.-based positions; international salaries are set to local market.

Expected Base Salary Range

$180,000 - $298,000 USD

About LILA

Lila Sciences is building Scientific Superintelligence™ to solve humankind's greatest challenges. We believe science is the most inspiring frontier for AI. Rather than hard-coding expert knowledge into tools, LILA builds systems that can learn for themselves.

LILA combines advanced AI models with proprietary AI Science Factory™ instruments into an operating system for science that executes the entire scientific method autonomously, accelerating discovery at unprecedented speed, scale, and impact across medicine, materials, and energy. Learn more at www.lila.ai.

Guided by our core values of truth, trust, curiosity, grit, and velocity, we move with startup speed while tackling problems of historic importance. If this sounds like an environment you'd love to work in, even if you don't meet every qualification listed above, we encourage you to apply.

Lila Sciences iscommitted to equal employment opportunityregardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity or Veteran status.

Information you provide during your application process will be handled in accordance with our Candidate Privacy Policy .

A Note to Agencies

Lila Sciences does not accept unsolicited resumes from any source other than candidates. The submission of unsolicited resumes by recruitment or staffing agencies to Lila Sciences or its employees is strictly prohibited unless contacted directly by Lila Science’s internal Talent Acquisition team. Any resume submitted by an agency in the absence of a signed agreement will automatically become the property of Lila Sciences, and Lila Sciences will not owe any referral or other fees with respect thereto.