Staff AI & Agentic Systems Engineer

Mozilla; United States; On-site; USD 180,000 - 240,000; Full time

Benefits offered by this job

Performance-based bonus plans

Comprehensive medical/dental/vision

Generous retirement contributions with

Quarterly wellness days

Company holidays + Birthday day off

Home-office stipend

Professional development budget

Well-being stipend

Parental leave

Job summary

Mozilla is building a new browser infrastructure platform for the next generation of web automation. We are looking for an experienced Staff Engineer to lead the architectural design and implementation of next‑generation AI agent frameworks and workflows.

What You'll Do includes architecting agentic systems, balancing speed and scale, and steering LLM workflows with top-tier tooling and performance benchmarking.

Qualifications

• 7+ years of professional software engineering in fast-paced environments.
• Ability to ship MVP quickly while designing clean API boundaries for scale.
• 2+ years of hands-on production experience building autonomous workflows.
• Deep familiarity with diverse LLMs and orchestration frameworks.
• Prior early-stage startup experience and comfort with ambiguity.
• Proficiency building software with AI tooling to speed delivery.
• Strong background in Python or Go and distributed back-end systems.

Responsibilities

• Architect agentic systems from zero and deploy production‑grade multi‑agent frameworks.
• Balance rapid prototyping with sustainable architecture and scalable foundations.
• Orchestrate LLM workflows across commercial and open‑source models.
• Lead by example using advanced AI coding tools to accelerate delivery.
• Benchmark, tune prompts, and evaluate agent reliability, latency, and accuracy.
• Set engineering standards and mentor engineers bridging research and product.

Skills

Deep experience

Pragmatic architecture

Agentic mastery

LLM fluency

Startup mentality

AI-native workflow

Strong foundations

Tools

LangChain

LangGraph

CrewAI

AutoGen

Cursor

Copilot

Job description

Mozilla is building a new browser infrastructure platform for the new generation of web automation. We are looking for an experienced Staff Engineer to lead the architectural design and implementation of next‑generation AI agent frameworks and workflows.

What You’ll Do:

• 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, knowing exactly when to cut corners to validate a concept and when to slow down to lay rock‑solid architectural foundations.
• Orchestrate LLM Workflows: Navigate and integrate various commercial and open‑source large language models, selecting and optimizing the right models for specific agentic behaviors.
• Accelerate with AI Tooling: Lead by example by extensively leveraging advanced AI coding tools to maximize velocity, while establishing best practices for AI‑assisted engineering across the team.
• 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 and acting as a primary bridge between research and product.

What You’ll Bring:

• Deep Experience: 7+ years of professional software engineering experience, particularly in fast‑paced environments where you have shipped complex systems from scratch.
• Pragmatic Architecture: A proven ability to judge technical debt. Know how to ship an MVP in days, but also how to design a clean API boundary so early speed doesn’t block future scale.
• Agentic Mastery: 2+ years of direct, hands‑on production experience building autonomous workflows, custom tools, and agentic systems.
• LLM Fluency: Deep familiarity with diverse LLMs and orchestration frameworks (e.g., LangChain, LangGraph, CrewAI, AutoGen, or similar tools).
• Startup Mentality: Prior early‑stage startup experience, meaning you are comfortable with ambiguity, pivot quickly based on data, and focus heavily on execution.
• AI‑Native Workflow: Deep, everyday proficiency building software with advanced AI coding tools (such as Cursor, Copilot, or custom LLM extensions) to radically speed up delivery.
• Strong Foundations: Comfort writing clean, high‑performance code in languages like Python or Go, with a solid grasp of distributed backend systems.

Bonus Points For:

• Experience building developer‑facing products, SDKs, or open‑source libraries.
• Prior contributions to open‑source AI or agent frameworks.
• Experience with vector databases and retrieval‑augmented generation (RAG) at scale.

Benefits:

• 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).

Commitment to Diversity, Equity, Inclusion, and Belonging

Mozilla understands that valuing diverse creative practices and forms of knowledge are crucial to and enrich the company’s core mission. We encourage applications from everyone, including members of all equity‑seeking communities, such as (but certainly not limited to) women, racialized and Indigenous persons, persons with disabilities, persons of all sexual orientations, gender identities, and expressions.

We will ensure that qualified individuals with disabilities are provided reasonable accommodations to participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment, as appropriate. Please contact us at [e-mail] to request accommodation.

We are an equal opportunity employer. We do not discriminate on the basis of race, religion, gender, gender identity, gender expression, color, national origin, pregnancy, ancestry, domestic partner status, disability, sexual orientation, age, genetic predisposition, medical condition, marital status, citizenship status, military or veteran status, or any other basis covered by applicable laws. Mozilla will not tolerate discrimination or harassment based on any of these characteristics or any other unlawful behavior, conduct, or purpose.