Senior/Staff Software Engineer, Agent

Jobtailor; San Carlos (CA); On-site; USD 190,000 - 260,000; Full time

Job summary

Jobtailor seeks a senior full-stack engineer to own the architecture of our agent harness powering conversational and autonomous creative workflows. You will design agents that plan and execute long-running tasks across multiple model vendors and build MCP servers and CLI tooling.

Lead the creation of reusable Agent Skills, observability, and evaluation frameworks, while mentoring engineers and shaping technical direction with founders across product and GTM.

Qualifications

• 7+ years of full-stack engineering experience shipping and owning production systems at scale.
• 2+ years building LLM-powered agents in production.
• Deep hands-on experience with agent architecture: tool use, context/memory management, multi-step planning, sub-agent orchestration, and long-running workflows.
• Track record designing evaluation frameworks and observability for agentic systems.
• Strong system design and data modeling skills.
• Experience authoring reusable Agent Skills, structured agent workflows, or equivalent abstractions.
• Demonstrated technical leadership.
• Strong AI-assisted coding practice using Claude Code, Codex, or Cursor.
• Startup experience or ownership of a product surface from 0 to 1 preferred

Responsibilities

• Own the end-to-end architecture of the agent harness powering conversational and autonomous creative workflows
• Design agents that plan and execute long-running creative tasks across multiple model vendors
• Build and maintain MCP servers and CLI-based agent tooling
• Author reusable Agent Skills and structured workflows
• Build evaluation and observability infrastructure including automated evals, regression suites, tracing, and quality gates
• Drive reliability, latency, and cost per successful run
• Ship production frontend experiences using React/Next.js
• Set architecture standards, conduct reviews, and mentor engineers
• Track the agent ecosystem and determine which technologies belong in OpenArt's stack
• Partner with founders, product, design, and GTM to translate user needs into technical direction

Skills

Full-Stack Engineering

LLM-Powered Agent Development

Agent Architecture Design

Technical Leadership

MCP Server Development

Tools

React

Next.js

Claude Code

Codex

Cursor

MCP Servers

CLI Tooling

Agent Orchestration Frameworks

LLM Evaluation Tooling

Observability Infrastructure

Job description

• Own the end-to-end architecture of the agent harness powering conversational and autonomous creative workflows
• Design agents that plan and execute long-running creative tasks across multiple model vendors
• Build and maintain MCP servers and CLI-based agent tooling
• Author reusable Agent Skills and structured workflows
• Build evaluation and observability infrastructure including automated evals, regression suites, tracing, and quality gates
• Drive reliability, latency, and cost per successful run
• Ship production frontend experiences using React/Next.js
• Set architecture standards, conduct reviews, and mentor engineers
• Track the agent ecosystem and determine which technologies belong in OpenArt's stack
• Partner with founders, product, design, and GTM to translate user needs into technical direction

Requirements

• 7+ years of full-stack engineering experience shipping and owning production systems at scale
• 2+ years building LLM-powered agents in production
• Deep hands-on experience with agent architecture: tool use, context/memory management, multi-step planning, sub-agent orchestration, and long-running workflows
• Track record designing evaluation frameworks and observability for agentic systems
• Strong system design and data modeling skills
• Experience authoring reusable Agent Skills, structured agent workflows, or equivalent abstractions
• Demonstrated technical leadership
• Strong AI-assisted coding practice using tools such as Claude Code, Codex, or Cursor
• High product sense
• Strong communication skills
• Practical experience building MCP servers and CLI tooling preferred
• Experience with agent orchestration frameworks and LLM evaluation/observability tooling preferred
• Hands-on experience with image/video generation models and creative asset pipelines preferredExperience with guardrails, safety, and cost controls for autonomous systems preferred
• Startup experience or ownership of a product surface from 0 to 1 preferred

Core Competencies

Demonstrates extensive experience in full-stack engineering with a focus on building and maintaining LLM-powered agents and production systems. Capable of driving architectural standards, mentoring engineers, and translating user needs into technical solutions.

Highest-signal resume keywords

• Full-Stack Engineering
• LLM-Powered Agent Development
• Agent Architecture Design
• Technical Leadership
• MCP Server Development

ATS Optimization Keywords

Hard Skills

• Agent Architecture
• Data Modeling
• Evaluation Frameworks
• Agent Skills Authoring
• System Design
• AI-Assisted Coding
• Long-Running Workflows
• Multi-Step Planning
• Sub-Agent Orchestration
• Creative Asset Pipelines

Soft Skills

• Strong Communication
• High Product Sense

Industry Keywords

• Autonomous Systems
• Creative Workflows
• Startup Experience
• Product Ownership
• Safety and Cost Controls

Tools & Technologies

• React
• Next.js
• Claude Code
• Codex
• Cursor
• MCP Servers
• CLI Tooling
• Agent Orchestration Frameworks
• LLM Evaluation Tooling
• Observability Infrastructure