Frontend Developer (React)

This role is suitable for a Senior Frontend Developer with strong commercial experience in React and solid JavaScript and/or TypeScript skills, based in Czechia, Slovakia, or Hungary. The candidate should be familiar with building scalable, reusable frontend components, integrating APIs, contributing to frontend architecture, and developing large-scale enterprise web applications. They should also be comfortable with code reviews, technical discussions, cross-functional collaboration, distributed international teams, and professional communication in English.

How would you structure a scalable React application for an enterprise workflow automation platform?

I would organize the application by business domains or features, with clear boundaries between UI, state management, API services, and shared components. This structure improves maintainability, supports team ownership, and allows features to evolve independently.

What principles do you follow when building reusable React components?

I keep components focused on a single responsibility, expose clear and minimal interfaces, and avoid coupling them to specific business logic. I also document expected behavior and use composition rather than excessive configuration or deeply nested prop structures.

How do you manage state in a complex React application?

I distinguish between local UI state, shared client state, and server state. Local state can use React hooks, while server data should be managed with appropriate caching and synchronization tools; shared state should be introduced only when simpler approaches are insufficient.

How would you integrate a React frontend with backend APIs?

I would create a dedicated API layer with typed request and response models, centralized error handling, authentication support, and consistent loading states. I would also handle cancellation, retries where appropriate, and validation of data received from external services.

How do you improve the performance of a React application?

I start by measuring performance using browser and React profiling tools, then optimize the actual bottlenecks. Typical improvements include reducing unnecessary renders, code splitting, virtualization for large lists, effective server-state caching, and optimizing asset delivery.

How do you approach TypeScript in a large frontend codebase?

I use strict compiler settings, explicit domain types, discriminated unions for complex states, and shared types for API contracts where practical. TypeScript should prevent common errors without becoming unnecessarily complex or duplicating business logic.

How would you handle errors and loading states in a workflow management UI?

I would model loading, success, empty, and error states explicitly and provide meaningful feedback with recovery actions. Errors should be logged with useful context while the interface remains resilient, preventing one failed operation from breaking the entire application.

What is your approach to frontend testing for React applications?

I focus on testing user-visible behavior with unit and integration tests, especially for complex workflows, forms, permissions, and API interactions. Critical end-to-end scenarios should also be covered to verify that the main business processes work across the complete application.

How do you ensure code quality when working in a distributed international team?

I rely on clear coding standards, automated linting and formatting, meaningful pull requests, and constructive code reviews. I document important architectural decisions and communicate assumptions early so that remote collaboration remains transparent and efficient.

How can AI-assisted coding tools be used responsibly in frontend development?

They can accelerate boilerplate generation, refactoring, test creation, and code exploration, but all generated code must be reviewed and validated. I would never submit AI-generated code without checking its correctness, security, maintainability, licensing implications, and consistency with project standards.

Nexer Czech Republic, part of DANIR AB, is hiring a Senior Frontend Developer to join an international team building an enterprise workflow automation platform for global customers. You will develop scalable, reusable web applications with React, JavaScript/TypeScript, APIs, and modern web technologies, while collaborating with backend developers, architects, and product teams. This is a fully remote, full-time B2B role available from Czechia, Slovakia, or Hungary; salary is not disclosed, and the position is worth applying for thanks to international projects, professional growth, AI-assisted development, and strong respect for work-life balance.