Lead Software Engineer, Agentic Engineering - fifththird

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Make your career a Fifth Third better®

Fifth Third Bank provides a variety of career development opportunities to help you build and sustain a strong future. We are proud of our workforce and of our employees' desire to stretch, learn and grow.

We are looking for a Lead Software Engineer to join our Agentic Engineering team. You will help build a platform where specialized AI agents compose across technical domains — knowledge and policy, change/ITSM, network security, cloud, and source code. Instead of an engineer manually stitching together answers from a half-dozen tools, agents coordinate with each other to do the work.

This is a hands-on technical role that requires strong proficiency in Python and TypeScript, a track record of shipping systems that run reliably in production, and the judgment to set the technical bar for the engineers around you. As a Lead, you own the execution of a meaningful part of the platform — driving designs, mentoring engineers, and turning direction into working software.

What You'll Do

• Lead the technical delivery of a workstream — own the design and implementation of production agents and the services they depend on, from prototype to production.
• Set and uphold engineering standards — agent patterns, tool integration, testing, code quality, and observability practices that hold the bar high on your part of the platform.
• Build the agent platform hands-on — implement the shared services and protocols (e.g., agent-to-agent messaging, tool servers) that let agents discover and compose with one another reliably.
• Stay deep in the code — you spend most of your time writing code, prototyping hard problems, and pairing with engineers on the toughest parts of the system.
• Help ensure agents behave — build the testing, evaluation, and observability that verify agents stay accurate, cost-efficient, and within guardrails over time.
• Mentor and review — guide engineers through design reviews and code reviews, and unblock them on hard technical problems.
• Break work into shippable increments — translate architectural direction into a plan you and the engineers around you can execute and be proud of.

What Differentiates This Role

This role asks you to build autonomous systems that reason — agents that make decisions, call tools, and message one another.

• You're implementing how agents get built — the shared patterns, base abstractions, and "paved road" that make new agents fast to build and safe to run.
• You're responsible for knowing agents are behaving — observability, evaluation, and continuous checks, not a one-time test.