Senior Full-Stack Engineer — Web-to-App

Remote | Full-time | Europe-friendly working hours

Haven is helping Applause hire a Senior Full-Stack Engineer to lead web-to-app engineering across its portfolio of consumer subscription apps.
You will own the complete journey from landing page to app subscriber and build reusable infrastructure that can be scaled across multiple products.

Responsibilities
Build and maintain landing pages, web onboarding, checkout flows, and web-to-app routing.
Own backend endpoints, server-side events, and integrations with growth and analytics tools.
Implement and troubleshoot RevenueCat, Superwall, Customer.io, MMP, and GA4 integrations.
Ensure reliable attribution, event tracking, identity handoff, and subscription data across web and mobile.
Build reusable components and implementation playbooks for the wider app portfolio.
Partner with growth, product, mobile engineering, and data on funnel experiments and new launches.
Diagnose and resolve checkout, tracking, routing, and attribution issues.
Build lightweight dashboards or internal tools when needed, without owning the data warehouse.

Requirements
Senior full-stack engineering experience with end-to-end ownership of production systems.
Strong experience with Next.js or a comparable modern full-stack framework.
Hands-on experience with backend endpoints, checkout or subscription flows, server-side tracking, and SDK integrations.
Extensive experience building web-to-app funnels for mobile app growth.
Working knowledge of RevenueCat, Superwall, Customer.io, MMPs, and GA4.
Strong understanding of attribution and event flows across web and mobile.
Ability to work autonomously and translate growth requirements into reliable technical solutions.

Nice to Have
Consumer subscription app or DTC experience.
Experience with paid acquisition funnels, experimentation, pricing, or paywall testing.
Experience supporting multiple products or brands through shared infrastructure.
Experience building lightweight operational dashboards.