Senior Frontend Engineer (Fintech)

Location: Hybrid, preferably one day per week in the Warsaw or Cracow office, Poland.

Company

Building an own fintech platform and financial services ecosystem at InPost scale through a lean engineering organization in Poland.

What you will do

• Design and implement microfrontend architecture across payment products and services.
• Own frontend performance engineering and improve Core Web Vitals across customer-facing applications.
• Deliver features through the full lifecycle, from requirements and specification through testing and release.
• Build integrations with backend services using GraphQL and REST APIs.
• Implement real-time user experiences with Server-Sent Events and develop secure payment-related interfaces.
• Contribute to frontend tooling, developer experience, and modern engineering workflows.

Requirements

• At least 5 years of experience building modern frontend applications.
• Hands-on experience with React, Vue, or Angular and TypeScript.
• Experience designing and implementing microfrontend architectures.
• Experience building and maintaining automated end-to-end tests with Playwright or similar frameworks.
• Understanding of frontend performance optimization, Core Web Vitals, profiling, and bundle analysis.
• Practical experience integrating REST and GraphQL APIs.
• Familiarity with OAuth2, OIDC, JWT, feature flags, and progressive delivery approaches.
• Active use of AI tools such as GitHub Copilot, ChatGPT, or Claude to improve development efficiency and quality.
• English proficiency at B2 level or higher.

Nice to have

• 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.

Culture & Benefits

• Full-time employment contract.
• Autonomous, accountable engineering environment focused on continuous learning.
• Collaboration with experienced product, engineering, and business teams.
• Access to event-driven architectures, cloud-native solutions, and other modern technologies.
• Opportunities to shape technical standards, mentor others, and influence platform evolution.