Senior Software Engineer

Job Description About the Role

We're hiring a Senior Full Stack Engineer who genuinely enjoys the front-end and wants to actively push our technology forward. Reporting directly to a hands‑on Senior Engineering Manager, you'll work across our entire stack---our backend runs on Python, our front-end on Next.js. You'll spend a meaningful portion of your time crafting the surfaces our customers actually touch: the dashboard, the image‑editing UI, and the APIs for managing accounts and configuration.

As we continue modernizing our stack, we're looking for an engineer who looks for meaningful improvements, not just maintenance---someone who raises the technical bar through hands‑on work, thoughtful code review, and clear documentation, and treats CSS and UI craft as real engineering, not a chore.

This is a hands‑on senior role. In a given week you might design a React component library, optimize a slow Python endpoint, debug a CI pipeline, or review an AI‑generated pull request. If that variety is the kind of work you find most engaging, this role is designed for you.

• Design, build, and ship:
  Own full‑stack features end‑to‑end, from API design through to polished, accessible UI.
• Drive front‑end architecture:
  Lead decisions on component patterns, state management, performance, and design system evolution.
• Champion our testing culture:
  We have a strong testing culture company‑wide---we want someone to bring that same rigor to our front‑end and account‑management code. You'll set the bar here: choosing the tooling, establishing the patterns, and turning solid coverage into a team habit.
• Write clean backend code:
  Maintain and build scalable Python APIs, collaborating on data modeling and GCP infrastructure.
• Build with AI tools:
  Use Claude Code, Codex, Gemini, or similar daily---for prompting, reviewing, and refining code.
• Act as an L3 escalation:
  Join a genuinely low‑volume, third‑level on‑call rotation. Our SREs resolve Tier 1 and 2 issues with runbooks and rollbacks, so escalations are rare---the manager you’d report to has been in this rotation since late 2024 without a single page.
• Mentor and elevate:
  Guide teammates informally through code review, pairing, and excellent documentation.

• Substantial full‑stack professional experience, with demonstrated ability to work across the entire stack independently and lead technical decisions.
• Proficient with at least one major cloud platform (the majority of our work is in GCP); able to design, deploy, and operate production workloads in the cloud.
• Strong front‑end expertise with React, the modern JavaScript/Type Script ecosystem, and a real sense for UI craft (spacing, hierarchy, responsiveness, accessibility).
• Backend proficiency in Python, or a demonstrated ability to become productive in Python quickly (we welcome strong developers from Node, Go, or Java eager to work in Python).
• Hands‑on experience with relational databases (PostgreSQL or similar) and REST/GraphQL API design.
• Fluent use of AI coding assistants in real production work---you can speak specifically to how you use them, where they help, and where they don't.
• Comfortable working across the stack and driving features to completion without needing a clear handoff at every stage.
• Strong written and verbal communication skills, critical to keeping our US and Japan‑based teammates aligned asynchronously.

• Experience with Python web frameworks like FastAPI, Django, or Flask.
• Familiarity with modern React tooling (Next.js, Tailwind, shadcn/ui, or similar).
• Basic Dev Ops and CI pipeline literacy.
• Experience integrating LLM APIs (Anthropic, OpenAI, etc.) into production applications.
• Background in design systems, component libraries, or design‑engineering collaboration.
• Interest in image/video processing, computer graphics, or web performance.

• Small, global team:
  Low process, high trust, and async‑first communication (recordings, shared notes) to keep teammates across time zones aligned.
• Remote‑first:
  Work from anywhere in the United States, with the option to work from our San Francisco office if you’re local.
• AI‑first building: AI tools are a primary part of how…