Senior Frontend Engineer

Quick Facts

• Role: Senior Frontend Engineer

• Focus: Microfrontend-based frontend for digital payment services

Description

Design, develop, and evolve microfrontend-based architectures for applications supporting digital payment services. Optimize frontend performance with a focus on Core Web Vitals and customer-facing responsiveness. Integrate frontend with REST and GraphQL APIs and build interactive real-time features using Server-Sent Events (SSE), across the full software development lifecycle.

Responsibilities

• Design, develop, and evolve microfrontend-based frontend architectures

• Analyze and improve frontend performance (Core Web Vitals, profiling, bundle analysis)

• Participate in the full SDLC: requirements, technical specifications, implementation, testing, and production releases

• Build and maintain REST/GraphQL integrations

• Implement real-time interactive features using SSE (or similar technologies)

• Create secure, reliable, user-friendly payment-related interfaces aligned with relevant standards and security practices

• Improve frontend development tools and developer experience

Requirements

• Minimum 5 years of commercial experience developing modern frontend applications

• Strong hands-on TypeScript experience and at least one of: React, Vue, or Angular

• Practical experience designing and implementing microfrontend architectures

• Experience developing, maintaining, and running automated end-to-end tests using Playwright or similar frameworks

• Solid understanding of frontend performance optimization, including Core Web Vitals, profiling, and bundle analysis

• Proven experience integrating frontend apps with REST and GraphQL APIs

• Familiarity with authentication/authorization: OAuth2, OIDC, JWT, plus feature flags and progressive delivery practices

• Regular use of AI-assisted development tools (e.g., GitHub Copilot, ChatGPT, Claude)

• Very good English and Polish

Benefits

• International working environment and international projects

• Private medical care

• Sports card

• Training courses

• Hybrid work: 1 day per week in the office (Kraków or Warsaw)