Senior Python FDE: Agent Runtimes & MCP

Apex Systems, LLC; Costa Mesa (CA); Hybrid; USD 160,000 - 230,000; Full time

Job summary

Apex Systems, LLC in Costa Mesa, CA is seeking a Forward Deployed Engineer for Agent Runtimes & MCP (Python). The role demands strong Python skills, asyncio, typed code, pytest, and ruff, plus experience shipping tool-using LLM agents via Claude APIs or Agent SDK.

You'll implement MCP servers with authentication, JWT/JWKS verification, OAuth client credentials, and secrets handling, and work from written acceptance criteria across unfamiliar codebases.

Qualifications

• 5+ years of Python development experience.
• Proficiency with asyncio, typed code, pytest, and ruff.
• Experience shipping tool-using LLM agents via Claude Messages API or Agent SDK.
• Experience building/integrating MCP servers with authentication.
• Knowledge of JWT/JWKS verification, OAuth client credentials, and secrets handling.

Skills

Python

Asyncio

Typed code

pytest

ruff

JWT/JWKS

OAuth

Secrets handling

Tools

Claude Messages API

Agent SDK

MCP servers

JWT verification

OAuth credentials

Job description

Apex Systems, LLC in Costa Mesa, CA is seeking a Forward Deployed Engineer for Agent Runtimes & MCP (Python). The role demands strong Python skills, asyncio, typed code, pytest, and ruff, plus experience shipping tool-using LLM agents via Claude APIs or Agent SDK.

You'll implement MCP servers with authentication, JWT/JWKS verification, OAuth client credentials, and secrets handling, and work from written acceptance criteria across unfamiliar codebases.