Senior Frontend Engineer

About this role

About Avaron AB

At Avaron, you get the security of permanent employment combined with the variety of working at different customers. We place specialists across everything from tech, IT and industry to project management and business support – and whatever the assignment, you have a consultant manager who is there for you and your development. About the Role You will take a key role in building complex frontend solutions in an environment where performance, accessibility, scalability, and secure user flows matter every day. This role is centered on end-to-end delivery of modern web experiences using TypeScript, React, and Next.js, with close collaboration across backend, SRE, security, and product. You will help shape technical direction, influence architecture decisions, and contribute to reliable solutions for enterprise-grade applications, including payment-related flows with high demands on quality and compliance. It is a great opportunity if you enjoy combining hands-on development with technical leadership in a modern product environment. Job DescriptionYou will own end-to-end delivery of complex frontend features, from design to production. You will design scalable and maintainable frontend architectures with focus on modularization, code splitting, and performance. You will drive state management strategy using tools such as Redux, Zustand, or React Query to ensure predictable data flow. You will build integrations toward APIs and BFF layers, and contribute to Node.js services when needed. You will turn product and design requirements into accessible, responsive, and high-quality UI with WCAG compliance and semantic HTML. You will optimize rendering, bundle size, network usage, and caching to improve overall user experience. You will establish coding standards, patterns, and best practices across the codebase. You will review code, mentor other engineers, and help raise the overall engineering quality. You will work proactively with debugging, logging, and