Senior Product Manager

About AntithesisAntithesis is building a fundamentally new approach to software testing. Our platform uses advanced fuzzing and property-based testing techniques to find deep bugs in customer software and exercise systems in ways that traditional testing cannot.We are in the early stages of productizing a powerful underlying technology. That means much of our product surface, operating model, and customer workflows are still being defined. This is a high-ambiguity, 0?1 environment where product judgment matters.About the RoleWe are hiring a Senior Product Manager to help build out the product function at Antithesis.This is not a purely executional role inside an established system. You will operate in a fast-moving, technical environment where many decisions are first-of-their-kind. You will help define product areas, shape workflows, influence prioritization, determine how we measure success, and partner closely with engineering and design to build durable foundations.You will mentor other PMs and help raise the bar for product thinking and practice across the team. Formal people management experience is a plus, but not required.This role is for someone who has built new products or major product surfaces from scratch and is comfortable making high-stakes tradeoffs under uncertainty.What You'll Do:Own one or more major product areas (e.g., onboarding/setup, VPC/on-prem, API, test lifecycle, debugging, fault tolerance testing) end-to-endConduct discovery sessions with customers and understand their needsDefine clear problem statements and outcomes in ambiguous environmentsMake principled tradeoffs between speed, scope, and technical constraintsPartner deeply with engineering on complex technical systemsInfluence product strategy and long-term directionDefine metrics and success criteriaHelp shape product standards and raise the bar for product craftWhat We're Looking For:Strong Signals: Startup experienceDemonstrated 0?1 product experience (built something new, not just optimized an existing system)Comfort operating in high-ambiguity, fast-changing environmentsExperience in developer tools, infrastructure, testing, security, or similar technical domainsStrong technical fluency (engineering background is a plus)Evidence of product judgment under uncertaintyExperience influencing strategy and prioritizationClear, structured written communicationDefined and used metrics / KPIs to drive decisionsBonus Signals: Early member of a product team that scaledMentored or hired PMsHelped establish product standards or practicesExperience with APIs, developer abstractions, Kubernetes, secure deployments, or distributed systemsNot a Fit IfYour primary focus has been implementing product frameworks (e.g., Scrum/Agile) rather than building productsYou primarily optimized mature systems rather than creating new onesYou prefer well-defined environments over ambiguous onesWhy This Role Is DifferentYou won't be plugging into an established PM machine. You'll help build it.This is an opportunity to shape how product works at a deeply technical company while directly influencing the trajectory of a novel platform.