Senior Frontend Engineer

Appcharge is a leading direct-to-consumer platform for app publishers. We help publishers sell digital goods directly to their users - bypassing traditional app store commissions and owning the full payment and commerce experience. The result: higher margins, better flexibility, and a more direct relationship with end users. Backed by $89M from leading investors and operators, we’ve grown 14x in the past year and now process over a billion dollars annually. We’re building the infrastructure that lets modern app businesses take back control of monetization – at scale. As a Senior Frontend Engineer on the Payments Platform team, you will play a key role in building scalable, high-performance frontend infrastructure and user experiences that power payment flows for global merchants. You’ll work closely with product managers, designers, backend engineers, and customer-facing teams to create reliable, elegant, and developer-friendly solutions used across multiple products and integrations. This role combines strong product thinking with engineering excellence — from building reusable UI systems and SDKs to optimizing performance, reliability, and scalability across our platform. We’re looking for someone who thrives in a fast-moving remote environment, takes ownership end-to-end, communicates clearly, and can independently drive projects from concept to production. Responsibilities • Design and develop scalable, performant, and maintainable frontend applications using React, TypeScript, and modern web technologies. • Build reusable UI components, shared libraries, and SDKs that support multiple products and integrations. • Collaborate closely with Product, Design, Backend, and Customer-facing teams to deliver intuitive and reliable user experiences. • Own features end-to-end — from technical planning and architecture through implementation, testing, deployment, and monitoring. • Optimize application performance, responsiveness, and reliability across devices and browsers. • Ensure high engineering standards through code reviews, testing, documentation, and observability. • Publish and manage SDK and NPM package versions, including backward compatibility and release management. • Help improve development workflows, tooling, and engineering best practices across the frontend ecosystem. • Contribute to building a strong engineering culture focused on quality, ownership, collaboration, and continuous improvement.

Requirements: • 5+ years of experience building modern web applications. • Strong proficiency in React, TypeScript, JavaScript, HTML, and CSS. • Experience designing and maintaining reusable frontend architectures, component libraries, or SDKs. • Experience managing NPM packages, versioning, and release processes. • Strong understanding of frontend performance optimization and modern browser behavior. • Experience working with APIs and complex asynchronous flows. • Familiarity with server-side rendering frameworks such as Next.js — advantage. • Familiarity with additional frontend frameworks (Angular, Vue, etc.) — advantage. • Experience building and maintaining frontend integrations with global payment platforms (e.g., Adyen, Stripe, Nuvei), including hosted components, wallets, and alternative payment methods — advantage. • Experience with cloud environments and CDN infrastructure (AWS preferred). • Experience working in production-scale environments with high reliability requirements — advantage. Soft Skills • Strong ownership mindset with the ability to independently drive initiatives in a remote environment. • Ability to balance speed, quality, and pragmatism in a fast-paced startup culture. • Strong collaboration skills across Engineering, Product, and Design teams. • Proactive problem-solver with a high attention to detail. • Comfortable working asynchronously across teams and time zones.