Senior Product Engineer

Open San Francisco, United States (On-site) Product Engineering Full-time Posted Sep 24, 2026

Role summary

Join an early-stage San Francisco AI company building an autonomous assistant that connects with everyday work tools, automates workflows, and enables users to create powerful product experiences around their work.
As Senior Product Engineer, you'll take significant ownership of the product surface, particularly frontend architecture and user experience, while working across the stack to take features from rough concepts through production.
This is not a narrowly scoped frontend implementation role. You'll be expected to make product and technical decisions, solve complex application architecture problems, and ship complete experiences without relying on rigid specifications.
The strongest candidates combine deep React, Next.js, and TypeScript expertise with evidence of building sophisticated web products and working effectively in early-stage environments.
Important

Important

• This is a full-time, on-site position in San Francisco
• European candidates who are genuinely open to relocating to San Francisco can also be considered
• Work authorization and sponsorship requirements will be assessed individually and are not a sourcing-stage exclusion
• Deep frontend architecture experience with React, Next.js, and TypeScript is required
• Candidates need experience owning complex web products and full-stack features end-to-end
• Previous startup experience somewhere in the candidate's career is required
• Publicly inspectable evidence of shipped work is required
• The interview process includes a one-week working session / trial assessment
• Relocation candidates should be prepared to discuss visa requirements, travel constraints, and the practical implications of relocating to San Francisco early in the process

We are looking for a Senior Product Engineer to own major parts of the product experience for an early-stage AI company building an autonomous assistant that integrates with everyday work tools and automates complex workflows.
You'll be responsible for taking rough product ideas through architecture, implementation, and production delivery, with particular ownership of frontend architecture and high-performance user experiences.
This is a hands-on engineering role for someone who combines deep frontend expertise with strong product judgement and the ability to own full-stack features end-to-end in a fast-moving startup environment.

Responsibilities

• Own complex product features from initial direction through production delivery
• Drive frontend architecture across a sophisticated React and Next.js application
• Build responsive, high-performance user experiences for complex and data-intensive workflows
• Own full-stack implementation where required to ship complete product features
• Make architectural decisions around state management, caching, invalidation, optimistic updates, and rendering performance
• Turn loosely defined product direction into working software without depending on detailed PRDs or finished designs
• Maintain a high standard for developer experience and UI architecture
• Work closely with a small early-stage team to rapidly iterate on product ideas

Required Skills

• Deep hands-on expertise with React, Next.js, and TypeScript
• Strong senior-level frontend architecture experience
• Evidence of owning and shipping complex web products
• Experience delivering full-stack product features end-to-end
• Previous experience working in a startup environment
• Strong product judgement and ability to work from rough product direction
• Publicly inspectable evidence of shipped work, such as products, projects, demos, repositories, or other relevant artifacts
• Willingness to work on-site in San Francisco
• Willingness to complete a one-week working session / trial assessment as part of the interview process

Technologies

• React
• Next.js
• TypeScript
• Modern full-stack web application architecture
• Complex state management and frontend performance patterns
• AI-assisted engineering workflows

Nice To Have

• Founder or founding engineer experience at an AI startup
• Experience working in an AI-native business or high-performing early-stage startup
• Experience with multiplayer, streaming, large-data, or similarly complex web interfaces
• AI-native engineering practices and regular use of AI development tools
• Experience with local-first client architecture
• Experience building design-first or next-generation AI products
• European-based candidate open to relocating to San Francisco

Soft Skills

• Strong product sense and ownership mentality
• Comfortable operating with ambiguity and limited specification
• Able to move quickly from idea to implementation
• High standards for product quality and engineering architecture
• Comfortable working in a small, fast-paced startup team

Your application data and CV will be processed for recruitment purposes and stored in TalentCore ATS.