Full Stack AI Engineer

AI Engineer (Contract-to-Hire)Location: Remote (Global, EST working hours) Start Date: RollingWe're building AI-native engineering team within Infinity, a holding company building full-stack AI businesses. We support portfolio companies by:Rapidly prototyping new product ideas to validate marketsProviding flex capacity during high-growth phasesMaintaining and evolving the Gravity our in house software factory and agent hub that we use to build all software.We're not a dev shop. We're a surgical team of builders who move fast, reduce ambiguity, and create leverage across a network of founders building with AI at the core.The RoleWe're looking for scrappy, sharp, execution-focused engineers who thrive in high-autonomy environments. You'll be deployed on fast-moving projects; from validating ideas in one-week sprints to helping scale production tools inside early-stage companies.This is a contract-to-hire role. If there's mutual fit, you'll transition to a full-time or retainer-based role within the core team.What You'll DoBuild working prototypes of agentic AI applications, LLM workflows, and full-stack productsExperiment quickly across frameworks, open source tools, and low-code stacksInterface directly with product thinkers and founders to distill ambiguous ideas into testable codeContribute to shared internal libraries and the Infinity Commons and add features to Gravity, our software factory platform.Occasionally embed with portfolio companies to support launches or unblock executionWhat We're Looking ForRequired:Fluency in Python and experience using AI toolkits and APIsExperience rapidly building and iterating on proof-of-concept or MVPsComfort using a blend of commercial APIs, open source, and low-code tooling to get things doneStrong problem-solving skills and analytical intuitionBonus Points:Prior work with AI agents, and a deep familiarity with what it takes to make them work well in production environments.Experience with frontend development (React, Next.js, etc.)A background in a STEM discipline, data science, or quant-heavy engineering you'll need to be able to show the impact of your work with statistical significancePrevious experience in a venture-backed startup or technical founder roleHow We WorkAsynchronous by default, with tight feedback loops and clear ownershipHigh-trust, high-autonomy culture that values shipping, learning, and iteratingSmall, elite team of senior builders with experience across AI, product, and infrastructureHow to ApplySend us:A short note in the application form on why this role fits you Links to past work, projects, or GitHub.Availability to start the contract phaseWe'll move quickly. If it feels like a fit, you'll be coding real things with us within a week.