Full Stack AI Engineer
At a glance
Mid-level AI Engineering role at Infinity. Remote, United States · full-time · no salary stated · we estimate $157,938–$275,000.
Infinity has not published a salary for this role. The figure below is our estimate, not theirs.
aimlroles summary, based on the employer's posting.
What you'll do
- Build working prototypes for agent-based AI apps, language-model workflows and full-stack products
- Test different frameworks, open-source tools and low-code approaches as you develop solutions
- Turn unclear product ideas into code you can test, working directly with founders and product thinkers
- Add capabilities to Gravity and contribute to shared libraries and Infinity Commons
- Join portfolio-company teams at times to help launch products or clear execution roadblocks
What you bring
- You work fluently in Python and have used AI toolkits and APIs
- You have quickly built and refined proof-of-concept projects or minimum viable products
- You can combine commercial APIs, open-source software and low-code tools to get work done
- You bring strong problem-solving ability and analytical judgment
Who this fits
This contract-to-hire role suits engineers comfortable owning work in a high-autonomy setting, from early prototypes to production tools. The work is asynchronous by default and follows EST working hours; occasional assignments embed you with portfolio companies. Applicants must use the application form, and should include work samples and their availability to start the contract phase.
From the employer
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.