Senior Agentic AI Engineer — Lead End-to-End Agents

EY; Hartford (CT); Hybrid; USD 144,000 - 359,000; Full time

Benefits offered by this job

Medical and dental coverage

401(k) plan

Paid time off

Flexible vacation policy

Job summary

EY is seeking engineers to build AI agents that operate across complex workflows with deterministic steps, managed autonomy, and strict safety controls. You will design architectures, create dependable tools, and govern agent behavior across production systems and enterprise integrations.

The role sits in Challenger Core, a rapid, cross-functional team focused on deploying high-impact, observable AI capabilities.

Qualifications

• Bachelor’s Degree in a relevant field of study.
• 9-12+ years of relevant experience.
• Strong record in software or applied machine-learning engineering, with ownership of production systems and their live behavior.
• Hands‑on evidence of shipping large‑language‑model applications, agents, or complex model‑driven workflows used for real work.
• Programming depth: Python, TypeScript, or another language used for production services and integrations.
• Applied AI patterns: model APIs, structured outputs, retrieval, tool use, and evaluation of variable behavior.
• Distributed execution: asynchronous work, state, concurrency, retries, and failure recovery.
• Identity and controls: access boundaries and scoped authority for applications or automated workloads.
• Production learning: traces, metrics, logs, incident analysis, and durable remediation.
• Travel and On-site requirements: up to 50% travel and hybrid office flexibility.

Responsibilities

• Choose the right execution model. Design agent architectures that use deterministic steps, a single-agent loop, or coordinated agents only when measured performance justifies the complexity.
• Build dependable tools. Create connectors and interfaces with clear contracts, validated outcomes, narrow authorization, and errors that help the agent recover or elevate.
• Engineer agent behavior. Shape planning, routing, delegation, stopping, retry, and handoff behavior across complete workflows.
• Create durable context. Combine instructions, user state, retrieval, memory, and environment feedback while preserving relevance, provenance, freshness, and permitted access.
• Bound agent authority. Implement scoped identities, credentials, budgets, approval points, and emergency containment so agents act within explicit limits.
• Evaluate complete trajectories. Build representative tests that measure verified task success, tool use, recovery, human takeover, and prohibited actions rather than isolated responses.
• Operate long-running execution. Use durable state, checkpointing, safe retries, versioned releases, rollback, and graceful degradation to keep work recoverable.
• Make behavior observable. Instrument end-to-end traces and replay so teams can understand failures, diagnose patterns, and turn production evidence into improvements.
• Protect user control. Design clear intervention points so people can inspect, interrupt, redirect, and safely resume agent work.
• Build shared capability. Partner across product, platform, knowledge, security, and evaluation teams and publish reusable agent patterns and operational lessons.

Skills

Production engineering

Agent architecture

AI application depth

Evaluation discipline

Security and operability

Product judgment

Education

Bachelor’s Degree in a relevant field of study

Tools

Python

TypeScript

Job description

EY is seeking engineers to build AI agents that operate across complex workflows with deterministic steps, managed autonomy, and strict safety controls. You will design architectures, create dependable tools, and govern agent behavior across production systems and enterprise integrations.

The role sits in Challenger Core, a rapid, cross-functional team focused on deploying high-impact, observable AI capabilities.