Senior Machine Learning Engineer

Harnham; New York (NY); Remote; USD 200,000 - 250,000; Full time

Job summary

Join a high-growth startup that is redefining digital advertising with innovative AI solutions. In this senior role, you'll develop and deploy machine learning systems, focusing on LLMs and foundational models. With a commitment to transparency and collaboration, you'll have the opportunity to make a real impact on business-critical problems. This role offers a competitive salary, equity, and unlimited PTO, all within a supportive environment that values your contributions and encourages professional growth. Embrace the chance to work with a lean tech team and help shape the future of advertising technology.

Benefits

Unlimited PTO

Equity

Performance Bonus

Support for Continued Education

Two Off-Sites per Year

Medical Insurance

Vision Insurance

401(k)

Qualifications

• 5+ years of experience in machine learning and AI.
• Strong experience with LLMs and foundational models.
• Comfortable deploying ML models into production.

Responsibilities

• Develop and optimize machine learning solutions.
• Build scalable pipelines for production.
• Work on demographic and behavioral data.

Skills

Machine Learning

Large Scale Systems

LLMs

Python

Model Monitoring

Education

Master's in Computer Science

PhD in Statistics

Tools

AWS

Databricks

Snowflake

Hugging Face

GraphQL

REST APIs

gRPC APIs

Job description

3 weeks ago Be among the first 25 applicants

Direct message the job poster from Harnham

My client is a high-growth startup transforming digital advertising—replacing black-box tools with transparent, customizable AI systems. Their platform gives brands full control of their data while using LLMs to unlock deep insights, automate decisions, and optimize campaigns across multiple platforms in real time. Backed by major partners and expanding globally, they’re scaling a lean tech team with a mandate to move quickly and build things that actually work.

THE ROLE

This is a senior-level hire focused on developing, optimizing, and deploying machine learning solutions—especially around LLMs and foundational models. You’ll work with large-scale systems, refine embedding pipelines, and help cut model runtime significantly. Expect real ownership, zero corporate fluff, and the chance to work on AI that’s actually applied to business-critical problems.

WITHIN YOUR FIRST 90 DAYS, YOU’LL:

• Work on demographic & behavioral data (e.g., product recommendations)
• Use LLMs to build predictive models
• Help consolidate and streamline embedding workflows
• Build scalable pipelines for production
• Reduce model runtime in a measurable way

THE STACK

AWS | Databricks | Snowflake | Hugging Face | GraphQL/REST/gRPC APIs | Python (object-oriented, production-ready code)

ABOUT YOU

• 5+ years of industry experience, ideally with a Master’s or PhD in CS, Stats, or a related field
• Comfortable with large-scale systems and deploying ML models into production
• Strong experience working with LLMs and foundational models
• Skilled in model monitoring, testing, and evaluation
• Experience mentoring junior engineers is a bonus
• Advertising experience is helpful but not essential
• You care about writing clean, maintainable code and thrive in collaborative environments

WHY JOIN?

• $200k base + equity + performance bonus
• Unlimited PTO
• Remote-first with ~5 hours EST overlap (hybrid NYC optional)
• High-growth startup with a collaborative, low-ego culture
• Real impact on product, roadmap, and scaling
• No corporate red tape—just smart people building good tech
• Support for continued education and upskilling
• Two off-sites per year to connect in person

HOW TO APPLY

Submit your interest through the apply link or reach out to Jack Wolf directly

Seniority level

• Seniority level

  Mid-Senior level

Employment type

• Employment type

  Full-time

Job function

• Job function

  Science and Engineering

• Industries

  Advertising Services and Software Development

Referrals increase your chances of interviewing at Harnham by 2x

Inferred from the description for this job

Medical insurance

Vision insurance

401(k)

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