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.

• 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.