Founding Machine Learning Engineer

Adaptive Security • New York, NY

11d • Onsite

About The Position

Adaptive is a cybersecurity startup on a mission to stop AI-powered cyberattacks. The company announced an $81M Series B led by NVIDIA and Bain Capital Ventures, with participation from Capital One Ventures, Citi Ventures, and continued support from Andreessen Horowitz (a16z), the OpenAI Startup Fund, and Abstract Ventures. Adaptive was founded by Brian Long and Andrew Jones, repeat entrepreneurs who have built and scaled category-defining companies. Adaptive protects teams from emerging threats like deepfakes, smishing, and AI-powered voice scams. We are seeking our 2nd ML Engineer to define and build Adaptive's ML capabilities. Our products use LLMs and ML models to detect, classify, and respond to cybersecurity threats in real time. The ML problems here are adversarial by nature. Attackers actively evolve to evade detection, labeled data is scarce for novel attack vectors, and models need to operate at production scale with strict latency constraints. We don't have dedicated ML infrastructure or an ML team today. You'll be building this from the ground up. You will set the technical direction, stand up the infrastructure, and do the hands-on work yourself. You’ll be instrumental in growing the function as our ML surface area expands this year and beyond.

Requirements

• 4+ years of experience building ML systems in production, ideally with experience standing up the ML function at an early stage startup or as the senior or lead ML person at a previous company.
• Strong software engineering fundamentals. You write production-quality code in modern languages (Python, Java, TypeScript) and work within large codebases.
• Experience with cloud ML infrastructure (AWS SageMaker, Bedrock, Modal, Baseten, or similar).
• Experience with common ML and data processing frameworks (PyTorch, Tensorflow, Spark)
• Comfortable working across the stack — infrastructure, backend services, and data systems.
• High autonomy. You'll have support and context from leadership, but you're expected to define the path forward and drive it.

Responsibilities

• Define Adaptive's ML strategy: where ML should be applied across our products, what infrastructure we need, and how we should approach build vs. buy decisions.
• Design and build production ML systems end-to-end — data pipelines, model training, evaluation frameworks, and inference serving.
• Establish evaluation methodology. Define how we measure model quality, catch regressions, and make data-driven decisions about model changes.
• Own the strategy for getting the data you need, in the format you need it — what/how to label, how to build feedback loops, and how our models improve over time.
• Partner with product engineers to integrate ML into the product. You will write production code and work within our existing codebase.
• Build and lead the ML team as scope grows.

Benefits

• Competitive cash compensation and meaningful stock.
• Several medical plans to choose from, most covered at 100% by Adaptive.
• 401k through Vestwell.
• Unlimited PTO, including winter break from Dec 24 - Jan 1.
• A fantastic office atmosphere including coffee, espresso, lounge, snacks, whiteboards, and tons of conference space.
• Rotating choice of 4 free lunch options from local restaurants every day.
• Expense dinner if you’re in the office past 7pm.
• Expense Uber if you happen to stay past 9pm.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Education Level: No Education Listed