Senior Frontend Software Engineer

flyer-one-ventures; Warszawa; On-site; PLN 210,000 - 320,000; Full time

Job summary

flyer-one-ventures in Warszawa, Poland, is seeking a senior software engineer to own the design and maintenance of web applications. The role focuses on TypeScript, React, Next.js, and React Query, with a fast-paced environment and minimal technical debt.

You will translate Figma mockups into polished, accessible UIs, drive architecture, optimize Core Web Vitals, and collaborate with design and product leadership to deliver delightful experiences.

Qualifications

• 5+ years of experience as a software engineer.
• 3+ years building and shipping web apps with React and Next.js.
• Strong knowledge of TypeScript, React, and React Native.
• Experience turning Figma mocks into websites.
• Solid UI/UX design understanding and attention to visual detail.
• Experience polishing UI with a designer collaboration.
• Experience with testing frameworks (Jest, Detox, etc.).

Responsibilities

• Own the technical vision and architecture for web applications.
• Lead end-to-end development of new user-facing features.
• Turn fuzzy ideas into clear specs and roadmaps.
• Build intuitive, responsive UIs from Figma mocks.
• Optimize performance focusing on Core Web Vitals.
• Evolve React/Next.js structure including routing and state.
• Define React Query caching, retries, and optimistic updates.
• Build a cross-platform component library with Storybook.
• Collaborate with design and product leadership to shape the experience.
• Represent engineering in roadmap discussions, balancing value and risk.
• Prototype UI/UX quickly to de-risk big bets with design.

Skills

Senior software engineer

React

Next.js

TypeScript

UI/UX

Tools

Jest

Detox

Storybook

Job description

About Us

We transforms the physical world into a real-time 3D environment built for commerce. Our spatial engine leverages state of the art CV+AI technologies and is already being used across industries – from boutique shops to Fortune 50 enterprises. We’re currently in stealth and backed by Tier 1 institutional investors.

Role

We are looking for a senior software engineer to own the creation, design, and maintenance of web applications at our company. The current applications are written in Typescript using React as a framework, served through Next.js, and using React Query. You will work in an environment that is fast paced, has little technical debt, and utilizes the latest technologies.

Responsibilities

• Own the technical vision and architecture for our web applications.

• Lead end-to-end development of new user-facing features.

• Break fuzzy ideas into clear specs, edge cases, phased plans.

• Build intuitive and responsive UIs from Figma mocks.

• Optimize application performance, focusing on Core Web Vitals.

• Evolve React/Next.js structure: routing, state, and code‑split rules

• Define React Query caching, retries, and optimistic updates.

• Build a cross‑platform component library with Storybook.

• Iteratively work with design and product leadership to create a delightful experience.

• Represent engineering in roadmap; balance value, effort, and risk.

• Rapid‑prototype UI/UX to de‑risk big bets with design.

Qualifications

• 5+ years of experience as a software engineer

• 3+ years of experience building and shippingweb applications with React and Next.js.

• Strong knowledge of TypeScript, React, and React Native.

• Experience creating websites from Figma mocks.

• Solid understanding of UI/UX design principles.

• A keen eye for detail, particularly in ensuring UI elements' visual quality and interactivity.

• Experience with ‘polishing’ UI in collaboration with a designer.

• Experience with testing frameworks (Jest, Detox, etc.).