About The CompanyScrambly is one of the fastest-growing adtech startups in the world, featured in the AppsFlyer Performance Index and Singular ROI Index in just 3.5 years. We’re growing 250%+ YoY across revenue, team, product, and technology - fully bootstrapped and profitable. We’re building the future of app discovery: a reward-powered alternative to the App Store and Google Play. Our loyalty-driven ecosystem connects millions of users with the world’s top apps and delivers unmatched, ROI-focused growth for mobile advertisers. Our mission is to build a true alternative to traditional app stores - fueled by rewards and data - and create a new, performance-first growth engine for mobile app advertisers.About The RoleWe are looking for a Senior Backend Engineer to join the team building the core systems behind Scrambly. In this role, you will work across two key areas: user-facing product systems - solving complex scalability challenges for a platform serving millions of users globally - and the internal platform, covering admin systems, tooling,
and back-office automation that power our operations team. Your focus will be on writing robust, high-performance code and bridging the gap between product requirements and technical reality. You will work within a modern tech stack to ensure our systems remain fast, reliable, and easy to maintain as we grow.Key ResponsibilitiesArchitecture & Development: Design, build, and maintain highly scalable Node.Js (NestJS) RESTful APIs and distributed systems. Ensure seamless frontend integration and drive long-term architectural improvements.Quality & Mentorship: Champion clean, testable code standards and foster a culture of technical curiosity by mentoring engineers through code reviews and pair programming.Infrastructure & Performance: Monitor system reliability, resolve bottlenecks, manage containerized application lifecycles, and partner with DevOps to optimize CI/CD pipelines.Cross-Functional Collaboration: Partner with Produ