Frontend Developer - Senior

Frontend Developer - Senior Overview: The Payment Gateway is part of our growing fintech software and payment management system. The team works on providing clients with a payment platform designed to help online businesses manage and process monetary transactions worldwide. About Product: А PCI DSS certified payment gateway for online businesses, providing integration with payment systems via a single software platform. Learn more Key responsibilities: Developing the back-office system using TypeScript and React; Building the payment interface and payment widgets using TypeScript and Preact; Developing client-side web widgets optimized for mobile devices; Collaborating within a Scrum team and actively participating in planning your own workflow; Contributing to architectural, infrastructural, and other strategic tasks; Conducting code reviews for team members and documenting your own code. Required Experience: 4-5+ years of hands-on experience in frontend development using React; English (Intermediate level) and Russian (Upper-intermediate level); Extensive experience with JavaScript (ES6+) and TypeScript; Proficiency in working with modern frontend frameworks (React, Preact); Strong skills in HTML and CSS; Ability to write testable code and create unit tests; Familiarity with Linux and an understanding of containerization (we use Docker); Familiarity with Figma. Nice to have: Knowledge of one or more modern approaches to application design (e.g., DDD, Clean Architecture, Hexagonal Architecture, etc.); Broad technical expertise and experience developing in one or more additional programming languages; Experience developing applications for financial systems or other industries where security and data integrity are critical requirements; Experience in iGaming; Experience building secure embedded interfaces: iframes, CSP, and WebView, including handling redirects, tab opening, and browser restrictions. Our Benefits: Full-time remote work opportunities and flexible working hours; Private insurance; An additional Day Off (1) per calendar year; Sports program compensation; Comprehensive Mental Health Programme; Free online English lessons with native speakers; Generous referral program; Training, internal workshops, and participation in international professional conferences and corporate events. Department Engineering Team Role Frontend Engineer Locations Warsaw, Poland Remote status Fully Remote Employment type Full-time About FinteqHub FinteqHub is a data-driven payment orchestration platform designed to help businesses manage and optimize payment processes across markets, currencies, and providers. Founded in 2019, the company combines over 15 years of industry experience in fintech and digital finance to deliver secure, scalable, and compliant payment infrastructure for global operations. Today, FinteqHub is powered by a team of more than 160 professionals across Europe, bringing together expertise in payments, software engineering, data analytics, and compliance.