Sr. Staff Software Engineer, Pinterest Assistant

About Pinterest:

Millions of people around the world come to our platform to find creative ideas dream about new possibilities and plan for memories that will last a lifetime. At Pinterest were on a mission to bring everyone the inspiration to create a life they love and that starts with the people behind the product.

Discover a career where you ignite innovation for millions transform passion into growth opportunities celebrate each others unique experiences and embrace theflexibility to do your best work. Creating a career you love Its Possible.

At Pinterest AI isnt just a feature its a powerful partner that augments our creativity and amplifies our impact and were looking for candidates who are excited to be a part of that. To get a complete picture of your experience and abilities well explore your foundational skills and how you collaborate with AI.

Through our interview process what matters most is that you can always explain your approach showing us not just what you know but how you think. You can read more about our AI interview philosophy and how we use AI in our recruiting process here.

What were looking for:

Millions of people across the world come to Pinterest to find new ideas every day. Its where they get inspiration dream about new possibilities and plan for what matters most. Our mission is to help those people find their inspiration and create a life they your role youll be challenged to take on work that upholds this mission and pushes Pinterest forward. Youll grow as a person and leader in your field all the while helping Pinners make their lives better in the positive corner of the internet.

We are looking for a passionate inquisitive and well-rounded Sr. Staff Backend Engineer to join the Pinterest Assistant team. The team is building a visual-first AI-powered companion that helps Pinners go from inspiration to action across shopping search and discovery. As the technical leader for our backend platform you will define the architecture and technical direction that powers our multi-modal conversational experiences at scale. Youll drive foundational investments across orchestration memory and personalization context management tool integrations APIs and platform infrastructure enabling the next generation of AI experiences. Working closely with Product Design Frontend Infrastructure and Machine Learning teams youll shape the long-term technical strategy raise the engineering bar across the organization and build reliable high-quality experiences that delight millions of Pinners.

What youll do:

• Define and drive the technical vision and architecture for the backend systems powering Pinterest Assistant ensuring they scale reliably as the product reaches millions of users.
• Lead the design and implementation of the core Assistant platform including orchestration memory and personalization context management APIs tool integrations and backend infrastructure.
• Drive technical strategy identifying foundational platform investments that unlock new Assistant capabilities while improving developer velocity reliability and scalability.
• Partner closely with Product Design Frontend engineers ML engineers and Infrastructure teams to build a deeply personalized multimodal conversational experience.
• Shape the architecture for AI-powered applications including retrieval context assembly tool execution memory and model orchestration in partnership with ML teams.
• Establish engineering best practices for production LLM and agent systems including observability logging evals safety mechanisms rollout strategies and incident response.
• Mentor engineers raising the technical bar through architecture reviews technical guidance and thoughtful engineering leadership.
• Navigate ambiguity and make pragmatic architectural decisions that balance rapid product iteration with long-term maintainability.
• Influence technical direction beyond the immediate team by collaborating across teams and helping shape Pinterests broader AI platform strategy.
• Stay current with advances in LLMs agentic systems and backend platform design and apply them pragmatically to consumer product development.

What were looking for:

• Bachelors degree in a relevant field such as computer science or equivalent experience
• 10 years of backend software engineering experience including significant experience leading large ambiguous systems that power consumer experience as a senior IC.
• 3 years operating as a technical lead driving the architecture and development of large-scale distributed backend systems.
• Strong backend engineering experience in Python TypeScript Node or similar languages and ecosystems.
• Experience building platforms or foundational infrastructure that enables product teams to move faster.
• Strong understanding of modern model-driven systems and experience partnering closely with machine learning engineers on AI-powered products.
• Strong leadership communication and cross-functional collaboration skills
• Familiarity with concepts such as retrieval ranking personalization inference context management or orchestration with ability to collaborate effectively on technical design.
• Track record of mentoring senior engineers and elevating engineering quality across an organization
• Product-minded and execution-oriented with the ability to lead in ambiguity and move fluidly between strategy and hands-on implementation
• A strong builders mindset: you know how to create momentum in ambiguous spaces make pragmatic early decisions and lay the technical foundation for systems that will grow in scale complexity and impact over time.
• Nice to have:
  • Experience building AI-powered or LLM-based products at scale
  • Experience designing systems for conversational AI agents tool calling or multimodal experiences.
  • Experience with retrieval ranking recommendation search or personalization systems.
  • Familiarity with embeddings retrieval-augmented generation (RAG) context management or memory architecture.
  • Experience partnering with Applied Scientists or Machine Learning engineers to bring ML capabilities into production.
  • Familiarity with evaluation frameworks experimentation and quality frameworks for AI products.
  • Full-stack development experience

Relocation Statement: Insert whether this job is eligible for relocation assistance.

• This position is not eligible for relocation assistance. Visit our PinFlex page to learn more about our working model.

In-Office Requirement Statement:

• We recognize that the ideal environment for work is situational and may differ across departments. What this looks like day-to-day can vary based on the needs of each organization or role.
• This role will need to be in the office for in-person collaboration once per quarter and therefore can be situated anywhere in the country.

#LI-HYBRID

#LI-KK6