Senior Agentic AI Systems Engineer

JoinStartup; New York (NY); On-site; USD 175,000 - 300,000; Full time

Benefits offered by this job

Comprehensive medical plan

401K with employer match

Commuter benefits

Catered lunch

Dinner stipend

Grubhub subscription

Health & Wellness Perks

Team offsites

Job summary

Mirage is an AI video company building agentic systems to power creative workflows. The role focuses on designing architectures for context gathering, planning, tool selection, and execution at scale, integrating cutting-edge models to power agent experiences in production.

We’re seeking senior engineers with 5+ years of experience in ML systems or agentic pipelines, capable of measuring quality using experiments and feedback, and comfortable working in a fast-paced startup environment.

Qualifications

• 5+ years of professional industry experience.
• A track record of designing and developing ML systems or agentic pipelines in production.
• Deep experience with context engineering: RAG systems, token optimization, context management at scale.
• Experience building evaluation systems and agentic infrastructure (context gathering, tool selection, multi-step planning).
• Exceptional problem solving fundamentals and ability to learn quickly in a rapidly evolving space.
• Startup founder or early engineer experience is a plus.

Responsibilities

• Design and build end-to-end agentic systems that improve creative workflows, balancing quality, performance, and reliability.
• Design agent architectures — how agents gather context, plan, select tools, and execute creative tasks reliably at scale.
• Integrate state-of-the-art models, combining internal research and external capabilities to power new agent experiences.
• Measure and improve agent quality in production, using experimentation, evaluation frameworks, and real-world feedback to guide iteration.

Skills

Agentic systems

LLM integration

RAG systems

Prompt engineering

Context engineering

Evaluation framework

Multi-agent architectures

LLM fine-tuning

Tool selection

Production ML systems

Python

System architecture

Experimentation

Tools

Python

APIs

LLM tooling

Job description

Mirage is an AI video company building agentic systems to power creative workflows. The role focuses on designing architectures for context gathering, planning, tool selection, and execution at scale, integrating cutting-edge models to power agent experiences in production.

We’re seeking senior engineers with 5+ years of experience in ML systems or agentic pipelines, capable of measuring quality using experiments and feedback, and comfortable working in a fast-paced startup environment.