Senior Staff AI, Agentic Systems Engineer

Mozilla

Senior Staff AI Engineer leading architectural design of AI frameworks at Mozilla. Building a new product in fast-paced environment as part of New Products organization.

Posted 7/9/2026full-timeRemote • 🇺🇸 United StatesSenior💰 $195,000 - $260,000 per yearWebsite

Tech Stack

Tools & technologies

GoPython

About the role

Key responsibilities & impact

Architect Agentic Systems from Zero: Design and deploy production-grade multi-agent frameworks, complex orchestration layers, and custom AI developer tooling.
Balance Speed and Scale: Navigate the tension between rapid prototyping and long-term sustainability.
Orchestrate LLM Workflows: Navigate and integrate various commercial and open-source large language models.
Accelerate with AI Tooling: Lead by example by extensively leveraging advanced AI coding tools.
Drive Evaluation and Performance: Implement rigorous frameworks for benchmarking, prompt engineering, and evaluating agent reliability, latency, and accuracy.
Collaborative Technical Leadership: Set engineering standards for code quality and system performance, mentoring other engineers.

Requirements

What you’ll need

7+ years of professional software engineering experience, particularly in fast-paced environments where you've shipped complex systems from scratch.
A proven ability to judge technical debt.
2+ years of direct, hands-on production experience specifically building autonomous workflows, custom tools, and agentic systems.
Deep familiarity with diverse LLMs and orchestration frameworks (e.g., LangChain, LangGraph, CrewAI, AutoGen, or similar tools).
Prior early-stage startup experience, meaning you are comfortable with ambiguity, pivot quickly based on data, and focus heavily on execution.
Deep, everyday proficiency building software with advanced AI coding tools (such as Cursor, Copilot, or custom LLM extensions) to radically speed up delivery.
Comfort writing clean, high-performance code in languages like Python or Go, with a solid grasp of distributed backend systems.

Benefits

Comp & perks

Generous performance-based bonus plans to all eligible employees – we share in our success as one team
Rich medical, dental, and vision coverage
Generous retirement contributions with 100% immediate vesting (regardless of whether you contribute)
Quarterly all-company wellness days where everyone takes a pause together
Country-specific holidays plus a day off for your birthday
One-time home-office stipend
Annual professional development budget
Quarterly well-being stipend
Considerable paid parental leave
Employee referral bonus program
Other benefits (life/AD&D, disability, EAP, etc. – varies by country)

ATS Keywords

✓ Tailor your resume

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools

Software EngineeringPython ProgrammingGo ProgrammingDistributed Backend SystemsPrompt EngineeringBenchmarking FrameworksTechnical Debt AssessmentCode Quality StandardsSystem Performance EvaluationComplex System Development

Soft Skills

CollaborationAdaptabilityExecution FocusMentoring