Founding AI Engineer: Build Production AI Agents & Scale

RecruitAbility Ltd; Philadelphia (Philadelphia County); On-site; USD 120,000 - 160,000; Full time

Job summary

RecruitAbility Ltd. is seeking a senior product/full-stack engineer to take the sole technical lead role, building a production-grade system from the ground up. You will work directly with the founders to decide architecture, data models, and how to scale for multiple customers.

You will own AI agent integration, maintain a deterministic core, and build evaluation harnesses to validate features before shipping, shaping the product as it evolves with customers.

Qualifications

• 7–12 years of experience as a product or full‑stack engineer.
• Shipped a data-heavy B2B application end to end.
• Built AI agents that run in production, not chatbot wrappers.
• Built evaluation or testing systems for AI-driven features.
• Able to explain where numbers come from and why decisions were made.
• Comfortable working alone, moving fast, and making decisions without a large team.
• Views an evolving product as something to shape, not a fixed spec.
• Current stack is Python on Postgres; language/tools open to new options.

Responsibilities

• Own end-to-end product development, from architecture to production.
• Decide whether to extend current code or rebuild for scale, defending the choice.
• Design data models and multi-customer schemas that grow over time.
• Create an evaluation harness to prove AI features work before shipping.
• Translate customer conversations into working data models, often without a formal spec.

Job description

RecruitAbility Ltd. is seeking a senior product/full-stack engineer to take the sole technical lead role, building a production-grade system from the ground up. You will work directly with the founders to decide architecture, data models, and how to scale for multiple customers.

You will own AI agent integration, maintain a deterministic core, and build evaluation harnesses to validate features before shipping, shaping the product as it evolves with customers.