Frontend Engineer (React)

Shelf, Warsaw

What you will do

Design and ship production Next.js SSR applications with complex state, high-load scenarios, and real-time AI interactions at scale
Build interfaces for AI-powered features: streaming LLM responses, semantic search across millions of documents, interactive knowledge graphs, and agentic builders
Architect component libraries and maintain the design system, ensuring reusability, accessibility, and consistent UX across the platform
Deliver enterprise-grade functionality: localization, accessibility compliance, cross-browser support, and security
Take full ownership after launch: monitor performance in production, optimize bundle sizes, instrument for Core Web Vitals, and ensure things scale gracefully
Keep the bar high on code quality, testing, and craft through thoughtful code review and mentorship

What you need

Over 5 years of frontend engineering experience, including 3+ years specializing in React and modern TypeScript
Production Next.js experience: SSR applications at scale, app router, server components, and the trade-offs between SSR, SSG, and CSR

About Shelf

The enterprise is going agentic and we are creating a unique operating system for an automated future.

Most AI agents break the moment they hit real business complexity. That’s why we built a platform that models a company's policies, workflows, and operational logic into an AI Data Model. Shelf enables AI Agents to reliably reason and deliver precise and reliable outcomes at scale.

We already have what most AI startups are still trying to earn: Enterprise customers such as Glovo, Nespresso, and HelloFresh, real production data, and tens of thousands of users. Customers trust us with operational knowledge: Our platform is highly reliable and secure with SOC2, HIPAA-ready security practices, and mature integrations in place.

Location – Warsaw, work from the office.

Our values

Quality. We're united by a focus on world-class Quality, in all things, starting with everything that leaves your desk. Every email, report, and piece of code should be outstanding, the kind of work that makes people say "Wow." How you do anything is how you do everything. Focus on craftsmanship: your ability to make things better.
Momentum. Know that the things you're responsible for are moving forward, and when something has stalled, get it moving again. We pride ourselves on "ball movement": leave someone with something and they should return to measurable progress. We initiate solutions, ideas, and progress rather than waiting for them, creating movement continuously.
Accountability. We feel accountable for more than anyone might normally expect, taking real responsibility even at the edge of our control. We align on expectations, give open and respectful feedback, and make every agreement clear and complete, and when we commit, we follow through.
Hard Work. We're here to do something difficult together, and we care intensely about the mission. That care shows up as intense effort and real ownership, and it comes with real opportunity at Shelf. We support each other, drive the mission forward, and sustain that effort together to win.
Learning Agility. We work in one of the fastest-moving spaces in history, which asks each of us to commit fully to learning every day. None of us knows everything; all of us can learn anything. Staying open and curious, with the humility to make mistakes and grow from them, is a key driver here. Learning is itself a skill, and we get really good at it.
Adapt and Thrive. Overcoming challenges lives deep in our DNA: obstacles are opportunities. Change is constant, and fighting it is counterproductive. We get comfortable being uncomfortable, knowing discomfort is the key to growth, and we "struggle well" together through real difficulty.
Win Together. We win or lose as a team, always. Everything here is connected to the rest of the organization. That shared environment demands full honesty, real candor and directness, and constant attention to how we support our teammates and do what's best for the whole company.

Frontend Engineer (React)

What you will do

What you need

Frontend Engineer (React)

What you will do

What you need

Frontend React Engineer

What strong performance looks like

Strong plus

How we evaluate fit

Why Shelf

About Shelf

About Shelf

Our values

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Shelf