Senior Agent Engineer

LTS

7d•Remote

About The Position

LTS is seeking a Senior Agent Engineer to join a small, senior engineering team applying frontier AI to one of the most consequential legacy systems still running in production today. The mission: build agents that read, translate, and modernize a decades-old codebase that millions of people quietly depend on. The work has executive backing, real users, and a customer who knows exactly what they’re buying. The team is small by design. Every seat carries unusual leverage, and we hire people who are already deep in this work. We use AI tooling natively — agents in parallel, model as collaborator, no exceptions.

Requirements

Bachelor’s degree in Computer Science, Engineering, or a related field, plus 5 years of professional software engineering experience; equivalent experience may substitute for the degree requirement.
Has shipped at least one production agent (real users, real failure modes) and can describe in detail what broke and how it was fixed.
Ability to work in a fast-paced, collaborative environment.
Working fluency across the modern agent stack: tool use, MCP, evals, RAG, streaming, multi-agent coordination.
Strong TypeScript or Python.
Subagents and multi-agent workflows are a normal way of working.
Comfort with measurement, regression detection, and prompt-and-eval iteration.
Ability to operate without a roadmap — defines the next problem worth solving and goes.
Heavy native use of AI tooling: agents in parallel, model as collaborator.
Demonstrated experience in a remote work environment.

Nice To Haves

Tooling around Claude or comparable frontier models at scale.
Code-understanding agent work — translation, refactoring, test generation, dependency analysis.
Background in compilers, program analysis, or static/dynamic code understanding.
Open-source contributions to agent frameworks, MCP servers, or eval harnesses.
Legacy-language or legacy-system exposure (rare, and a plus rather than a requirement).
Public technical writing or conference talks on production agent work.
Healthcare IT or legacy modernization domain experience.

Responsibilities

Own the agent layer of the platform — architecture, prompts, tool surfaces, multi-agent orchestration, and the eval loop.
Set the technical ceiling for the platform’s core capabilities: translation accuracy, dependency-map correctness, hallucination control.
Drive translation and dependency-mapping accuracy across an unfamiliar legacy paradigm — call graphs, data references, semantic equivalence checks.
Take on capability bets that don’t show up on most roadmaps yet — agent work at the frontier of code understanding.
Drive the prompt-and-eval iteration cycle in partnership with the RAG & Eval Engineer.
Write production agent code daily; subagents and multi-agent workflows are your normal way of working.