Senior Frontend Engineer (React/Rails & AI-Assisted Development)

Job Description

Job Overview:

You’ll be engineer #3. We’re a small team, so you’ll have a real say in what we build and how we build it. Your work will ship to the people who use our platform every day, and you’ll help shape our engineering practices as we grow. There’s also room to grow from a senior role into a staff-level role as the team expands.

You’ll help shape our frontend. Our platform has a Rails API and two React applications: a customer-facing storefront and an admin app. React already makes up most of our codebase, and we expect that to keep growing. We’re looking for someone who knows modern React well and can help guide the architecture and evolution of both applications.

AI agents are part of how we build. We provide a generous monthly budget so you can use the AI tools that work best for you. We’re less concerned with which tools you choose and more interested in how you use agents to plan, build, test and debug as part of your everyday workflow.

Quality still matters. We ship often and take pride in doing things well. AI helps us move faster, but we’re still responsible for understanding, testing and standing behind what we ship.

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What You’ll Do:

Frontend Architecture & Development

• Own the architecture of our two React apps, including component structure, state management, data fetching, routing and performance.
• Build and maintain a shared design system that keeps our interfaces consistent and makes them easier to develop.
• Bring modern React practices to both codebases and help them evolve with the ecosystem.
• Improve older workflows and interfaces our internal teams use every day.
• Build and ship features for the storefront and admin, from scoping through deployment and monitoring.
• Write and maintain tests, including end-to-end tests with Playwright, to keep the frontend reliable.

Full-Stack Product Engineering

• Work across the stack when needed, including our Rails API, Postgres database and AWS infrastructure managed with Terraform. We’re a small team, so everyone pitches in where the work needs to be done.
• Help make system design decisions across the platform, beyond the frontend.
• Work on different parts of the platform, including storefronts, punchouts, program stores, fulfillment and reporting.

AI-Assisted Development

• Use AI agents throughout your workflow, from planning and implementation to testing, code review and debugging.
• Break work into manageable pieces that agents can help with and you can verify.
• Review AI-generated code as carefully as any other code and take responsibility for what ships.
• Know when an agent can help you move faster and when it makes more sense to work through a problem by hand.
• Share what’s working and help the team improve how we build.

Collaboration

• Spend time with teams across the company, including fulfillment and account teams, to understand their workflows and where they need help.
• Work directly with department leads and customers to turn their feedback into product improvements.
• Work with leadership on priorities and product direction.
• Explain technical decisions and tradeoffs in a way non-technical teammates can understand.

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What You Bring

• 5+ years of professional software development experience, with a strong frontend focus and experience working across the stack.
• Deep experience with modern React , including hooks, component architecture, state management, data fetching and performance.
• Strong TypeScript skills.
• Experience making frontend architecture decisions in production and explaining the tradeoffs behind them.
• Experience building or maintaining a design system, ideally with Tailwind.
• Strong system design skills and a willingness to work on backend code when needed.
• Experience building frontends that work with REST or GraphQL APIs.
• A habit of writing automated tests, including end-to-end tests. Playwright is a plus.
• Experience using AI agents in your daily development work. You can walk us through your workflow, the tools you use and how you verify what they produce.
• Strong communication skills and an interest in working with people outside engineering.
• A self-directed approach and comfort working through ambiguity in a startup environment.

Nice-to-Haves

• Experience with Next.js , especially App Router and server components. This is strongly preferred.
• Experience with Ruby on Rails.
• Experience with Postgres, AWS or Terraform.
• Experience coordinating multiple agents or sub-agents in your development workflow.
• Experience with LLM integrations, prompt engineering, RAG or Model Context Protocol (MCP).
• Experience in e-commerce or B2B commerce, including punchout integrations (cXML/OCI).
• Familiarity with the promotional products industry.
• Experience at an early-stage startup.

What Sets You Apart

• You have ideas about frontend architecture, but you’re open to changing your mind.
• You think about the systems and workflows around the code, not just the code itself.
• You’re always finding ways to improve how you work with AI agents.
• You know when to move quickly and when a problem needs more care.
• You’d rather talk to the people using the software than guess what they need.
• You enjoy helping the people around you do their best work.