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About the Role

Petra is building an AI-driven Detection and Response platform to catch and remove attackers before they can act. This role is a rare chance to join early and help scale to $30M+ in revenue in the next 12 months.

Responsibilities

Build and evolve core ML detection research and models.
Design and build ML models that identify account compromise in real time.
Take models from research to production, measuring their behavior at scale in a live system.
Architect and implement solutions to handle significant scale increases.
Establish patterns, push for correctness, and raise the quality of the codebase.
Talk to customers to understand the attacks they are facing.
Think creatively about how to find the next signal that widens the gap between Petra and competitors.

Requirements

5+ years of quantitative/machine learning research experience.
Meaningful time designing, training, evaluating, and shipping models in production systems at scale.
Strong quantitative fundamentals: probability & statistics, linear algebra, linear and non-linear modeling, NLP.
Experience training & deploying models in production, understanding the limitations of each modeling approach.
Strong engineering fundamentals, writing clean, production-grade code.
Comfortable owning a system end to end.
Experience working with real-time or streaming data pipelines, feature stores, high-performance databases, and distributed systems.
High agency and high output: identify problems, propose solutions, and execute.
Comfortable in a small-team, high-autonomy environment.
Proud of building things that work well and hold up over time.

Skills

Python
Node
TypeScript
React
Machine Learning
Quantitative Research
Probability
Statistics
Linear Algebra
Linear Modeling
Non-linear Modeling
NLP
Production Systems
Real-time Data Pipelines
Streaming Data Pipelines
Feature Stores
High-Performance Databases
Distributed Systems

Location

San Francisco, CA

Work Type

In-person
Full-time

Experience Level

5+ years

Salary/Compensations

Competitive salary
Top dollar for exceptional researchers

Benefits

Equity
Healthcare
Dental
Vision
Lunch and dinner when working in the office
401K
Commuting stipend
Equinox discount
Relocation support

About the Company

Petra is on a mission to stop the most dominant cyberattacks on the planet.
Cybersecurity titans are born when a new attack vector overwhelms existing defenses.
Petra is building an AI-driven Detection and Response platform.
The company has grown very quickly, reaching mid-7-figures in ARR in under a year and then doubling ARR in the past few months.
Petra protects over 2.5 million users across 10,000+ businesses.
Customers consistently report Petra as the best product they've ever used.
The team includes founders from ex-Abnormal Security, Palo Alto Networks, and Bridgewater.
Early team members include a Sequoia-backed founder, an engineering leader from Anduril, and quant researchers/engineers from IMC, SIG, Citadel, and Cubist.

Equal Opportunity

Petra is an equal opportunity employer.
We do not discriminate on the basis of race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, veteran status, or any other characteristic protected by applicable law.
We are committed to building a diverse and inclusive team and welcome applicants of all backgrounds.