Senior Frontend Engineer (React)

OPTIVEUM sp. z o.o. • Capon Bridge, WV

2d • Remote

About The Position

Our Client is an ambitious tech company on a mission to create a frictionless shipping experience for SMEs. They wrap real-time pricing, comparison, booking, and tracking into a clean and unified interface, replacing outdated logistics processes with a seamless digital platform. We are looking for an experienced Senior Frontend Engineer to play a central role in shaping a web app where thousands of customers every week sign up, compare rates, manage integrations, and book shipments. You will work end-to-end—from understanding customer problems to shipping production code—while leading frontend work on a core value team (Customer Experience, Marketplace, or SaaS).

Requirements

• 8+ years of experience writing production frontend code, with the last 3+ at a senior level in a scale-up/start-up environment.
• Deep React and TypeScript experience, with strong opinions on state management and component architecture.
• Solid web fundamentals: HTML semantics, modern CSS (Grid, Flexbox, container queries), browser rendering pipelines, and the network layer.
• Accessibility expertise as a practitioner skill, capable of spotting WCAG issues during design reviews.
• Fluency in web performance, measuring and optimizing Core Web Vitals on real products.
• High testing maturity (unit, integration, and end-to-end tests).
• Excellent written and spoken English communication skills.

Nice To Haves

• Experience with large-scale monorepos
• Background in logistics/marketplaces/B2B SaaS
• Contributing to design systems
• Embedding AI-assisted features
• Working knowledge of Go

Responsibilities

• Plan and lead frontend development within your value team, collaborating closely with PMs, designers, and backend engineers.
• Translate designs into production user interfaces that are accessible, performant, well-tested, and consistent with the rest of the product.
• Build prototypes to put working code in front of customers when validating product ideas.
• Own web performance on the surfaces you touch, ensuring excellent Core Web Vitals to boost conversion rates.
• Champion accessibility across the platform (WCAG 2.2 AA is the baseline).
• Contribute to architecture decisions that cross the frontend/backend line, including API boundaries and real-time updates.
• Maintain shared standards across a React/TypeScript monorepo through code reviews and technical councils.
• Mentor junior engineers and contribute to the evolution of the company's design system.

Benefits

• Work with a modern tech stack (React, TypeScript, AWS, Snowflake, Figma, Claude Code, etc.)
• A curious, collaborative, low-ego culture within a Great Place to Work certified environment

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Education Level: No Education Listed