Senior Frontend Engineer - Fintech Engineering (M/F/N)

We're looking for a Senior Frontend Engineer to join our FinTech Platform team and help us build seamless payment experiences for consumers and merchants. In this role, you'll own consumer-facing and merchant-facing payment journeys, driving frontend architecture, performance engineering, and product quality. You'll work across modern web technologies, contributing to highly scalable and secure payment solutions. What will you work on? • designing and implementing microfrontend architecture across payment products and services, • owning performance engineering and continuously improving Core Web Vitals across customer-facing applications, • participating in the full development lifecycle, from requirements and specification through testing and release, • building integrations with backend services using GraphQL and REST APIs, • implementing real-time user experiences using Server-Sent Events and similar technologies, • developing secure payment-related user interfaces aligned with industry requirements and best practices, • contributing to frontend tooling, developer experience, and modern engineering workflow. This cooperation may be a strong match if you: • have at least 5 years of experience building modern frontend applications, • have hands-on experience with React, Vue, or Angular and TypeScript, • have experience designing and implementing microfrontend architectures, • have experience building and maintaining automated end-to-end tests using Playwright or similar frameworks, • understand frontend performance optimisation, Core Web Vitals, profiling, and bundle analysis, • have practical experience integrating REST and GraphQL APIs, • are familiar with OAuth2, OIDC, JWT, feature flags, and progressive delivery approaches, • actively use AI tools such as GitHub Copilot, ChatGPT, or Claude to improve development efficiency and quality, • communicate in English at B2 level or higher. Additional advantages: • experience in payments, fintech, or e-commerce products, • knowledge of PCI DSS requirements, CSP configuration, and secure browser-based architectures, • experience with WCAG accessibility standards, • backend development experience in Node.js, Java, Python, or C#, • experience building embeddable widgets or SDKs. What we offer: • the opportunity to build products that sit at the heart of InPost's growing financial services ecosystem, • ownership of business-critical solutions operating at scale, • a modern engineering environment focused on autonomy, accountability, and continuous learning, • collaboration with highly experienced product, engineering, and business teams, • access to cutting-edge technologies, event-driven architectures, and cloud-native solutions, • opportunities to shape technical standards, mentor others, and influence platform evolution, • full-time contract of employment.