Full Stack AI Engineer - Infinity Constellation

AI ENGINEER (CONTRACT-TO-HIRE) Location: Remote (Global, EST working hours) Start Date: Rolling Please apply using the provided form, candidates who directly email will not be considered. ABOUT THE PROJECT We'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 markets - Providing flex capacity during high-growth phases - Maintaining 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 ROLE We’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 DO - Build working prototypes of agentic AI applications, LLM workflows, and full-stack products - Experiment quickly across frameworks, open source tools, and low-code stacks - Interface directly with product thinkers and founders to distill ambiguous ideas into testable code - Contribute 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 execution WHAT WE’RE LOOKING FOR Required: - Fluency in Python and experience using AI toolkits and APIs - Experience rapidly building and iterating on proof-of-concept or MVPs - Comfort using a blend of commercial APIs, open source, and low-code tooling to get things done - Strong problem-solving skills and analytical intuition Bonus 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 significance - Previous experience in a venture-backed startup or technical founder role HOW WE WORK - Asynchronous by default, with tight feedback loops and clear ownership - High-trust, high-autonomy culture that values shipping, learning, and iterating - Small, elite team of senior builders with experience across AI, product, and infrastructure HOW TO APPLY Send 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 phase We’ll move quickly. If it feels like a fit, you’ll be coding real things with us within a week.