Senior Full Stack Engineer; BE focused

About The Opportunity

We are building something brand new — and this role is foundational to the quality, performance, and scalability of what we ship. We need someone who takes genuine pride in the craft of back‑end engineering: an engineer who sees system architecture, data modeling, API design, and performance not as hidden infrastructure, but as the core engine of the product. This is an immediate hire.

This is a full‑stack role with a back‑end focus. The primary ownership is the server‑side architecture and data layer, but this engineer is expected to contribute across the stack — building UI components, understanding client‑side state, and making informed architectural decisions end to end. This person will be one of the most senior engineers on the team, with real ownership over how our systems are built, scaled, and integrated across the platform.

This role is on site in Mountain View, CA.

• System Architecture & API Development — Designing, building, and scaling robust, efficient back‑end APIs that power our front‑end, with a strong sense of what makes an API clean, secure, and performant.
• Data & Storage — Owning database schemas, querying patterns, and storage strategies; understanding how data architecture decisions directly affect the product experience and system scalability.
• Full‑Stack Integration — Owning the full request lifecycle, from data persistence and messaging layers up to the API and UI interaction.
• Back‑End Performance & Security — Implementing caching strategies, optimizing database queries, managing asynchronous events/messaging, and ensuring robust authentication/authorization.
• Front‑End Contribution — Writing clean, maintainable code within our React/Next.js ecosystem to consume APIs and deliver cohesive user experiences.
• Test Coverage — Writing comprehensive unit, integration, and functional tests (focusing heavily on API and database reliability) that keep the codebase stable as it scales.
• Engineering Culture — Leading code reviews, mentoring junior and mid‑level engineers, and helping define the engineering standards we hold ourselves to.

• Front‑End Engineering Teams — Aligning early on API contracts, data hydration patterns, and service boundaries to ensure the client‑side has the performant, logical endpoints it needs.
• Product & Design — Helping shape what’s technically feasible, flagging trade‑offs and edge cases early, and translating product requirements into scalable system designs.
• Data/Infra Teams — Collaborating on shared back‑end decisions, infrastructure deployment, and event‑driven messaging architectures.

• Node.js and Type Script expertise
• Strong React proficiency
• Ability to comfortably read, write, review, and debug code
• Strong problem‑solving skills
• High standards for software quality and maintainability

• Experience with animations, CSS motion, or Framer Motion is a nice‑to‑have.
• Strong React experience remains important.

Salary Range: $155,000–$157,000 per year.