React.js Software Engineer - Finland based

Espeo Software

1d•$40 - $55•Remote

About The Position

We are a technology company that started its journey in 2008. Our main headquarters is located in the picturesque city of Poznań, nestled by the beautiful Malta lake. For more than 17 years, we have been assisting companies in developing and implementing innovative fintech solutions. Leveraging our expertise in areas such as blockchain, online payments, and more, our clients can invent and develop cutting-edge solutions and services that keep them at the forefront of innovation. Job requirements React.js Software Engineer SKILLS: React.js | JavaScript/TypeScript | Redux/Zustand | REST APIs | CI/CD | Testing B2B COOPERATION: 40-55 €/hour 💰 LOCATION: REMOTE IN FINLAND (occasional travels to Helsinki) START DATE: ASAP Key Services and Requirements: A Roadmap to Your Professional Success 🚀 Scope of services (applies to both Mid-Level & Senior) : Design, build, and maintain high-quality React.js applications within a component-driven architecture Architect and enforce component libraries, state management patterns, and frontend standards across teams Implement performant, accessible UIs that scale across multiple markets and localization requirements Integrate with backend REST APIs and manage async data flows using established patterns Ensure code quality, performance, accessibility, and comprehensive testing (unit, integration, end-to-end) Collaborate with Product, Backend (Java), Design, Mobile (React Native), and DevOps teams across European markets Participate in architectural discussions, technical design reviews, and contribute to platform-wide frontend standards Take ownership of the reliability and operability of frontend applications, proactively reducing technical debt Leverage AI-native development tools (Copilot, Cursor, Claude) to accelerate delivery and improve code quality Support a “you build it, you run it” mindset for reliable delivery and smooth operations Here’s a set of skills we require: Middle Level 3-5 years of professional software development experience Solid experience with React.js ( hooks, functional components) and modern JavaScript/TypeScript Familiarity with state management (Redux, React Query, Context API, or similar) Understanding of RESTful APIs and async data patterns Unit testing with Jest; integration testing is a plus Basic knowledge of web accessibility and internationalisation Experience collaborating with cross-functional teams and following existing frontend standards Senior Level 6-8 years of professional software development experience Deep expertise in React.js (hooks, context, concurrent features) and modern JavaScript/TypeScript Strong experience with state management (Redux, Zustand, React Query, or similar) Hands-on experience designing and maintaining component libraries and design systems Solid understanding of frontend performance optimization (code splitting, lazy loading, bundle analysis) Advanced knowledge of web accessibility standards (WCAG 2.1) and internationalisation (i18n) Integration and end-to-end testing experience (Cypress, Playwright) Experience mentoring mid-level engineers and driving frontend standards across teams Familiarity with Docker, CI/CD pipelines (Vite, Webpack, GitHub Actions), and frontend observability (Sentry, metrics, logging) Nice to have: Experience defining and scaling frontend standards across multiple teams or domains Practical experience modernizing or refactoring legacy frontend systems Active usage of AI-assisted development tools in daily workflow Exposure to high-traffic, production-grade applications Experience shaping engineering culture and mentoring at scale Interest in or experience with React Native All done! Your application has been successfully submitted!

Requirements

React.js
JavaScript/TypeScript
Redux/Zustand
REST APIs
CI/CD
Testing
3-5 years of professional software development experience (Middle Level)
6-8 years of professional software development experience (Senior Level)
Solid experience with React.js ( hooks, functional components) and modern JavaScript/TypeScript
Deep expertise in React.js (hooks, context, concurrent features) and modern JavaScript/TypeScript
Familiarity with state management (Redux, React Query, Context API, or similar)
Strong experience with state management (Redux, Zustand, React Query, or similar)
Understanding of RESTful APIs and async data patterns
Hands-on experience designing and maintaining component libraries and design systems
Unit testing with Jest; integration testing is a plus
Integration and end-to-end testing experience (Cypress, Playwright)
Basic knowledge of web accessibility and internationalisation
Advanced knowledge of web accessibility standards (WCAG 2.1) and internationalisation (i18n)
Experience collaborating with cross-functional teams and following existing frontend standards
Experience mentoring mid-level engineers and driving frontend standards across teams
Familiarity with Docker, CI/CD pipelines (Vite, Webpack, GitHub Actions), and frontend observability (Sentry, metrics, logging)

Nice To Haves

Experience defining and scaling frontend standards across multiple teams or domains
Practical experience modernizing or refactoring legacy frontend systems
Active usage of AI-assisted development tools in daily workflow
Exposure to high-traffic, production-grade applications
Experience shaping engineering culture and mentoring at scale
Interest in or experience with React Native

Responsibilities

Design, build, and maintain high-quality React.js applications within a component-driven architecture
Architect and enforce component libraries, state management patterns, and frontend standards across teams
Implement performant, accessible UIs that scale across multiple markets and localization requirements
Integrate with backend REST APIs and manage async data flows using established patterns
Ensure code quality, performance, accessibility, and comprehensive testing (unit, integration, end-to-end)
Collaborate with Product, Backend (Java), Design, Mobile (React Native), and DevOps teams across European markets
Participate in architectural discussions, technical design reviews, and contribute to platform-wide frontend standards
Take ownership of the reliability and operability of frontend applications, proactively reducing technical debt
Leverage AI-native development tools (Copilot, Cursor, Claude) to accelerate delivery and improve code quality
Support a “you build it, you run it” mindset for reliable delivery and smooth operations