Senior Backend Engineer

**About Us** **[Scrambly](https://himalayas.app/companies/scrambly)**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 Role** We are looking for a **Senior Backend Engineer** to join the team building the core systems behind [Scrambly](https://himalayas.app/companies/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 Responsibilities** * **Design & Implementation** * Design, build, and maintain high-performance, scalable backend services and APIs using Node.js (**NestJS**) * Write clean, maintainable, and testablecode that serves as a benchmark for the team * Ensure seamless integration between backend services and frontend applications * **Architecture & Technical Strategy** * Propose and implement architectural improvements for core systems * Design complex features with a focus on long-term scalability, extensibility, and maintainability * Apply best practices for distributed systems and RESTful API design * **Mentorship & Code Quality** * Champion high code quality and engineering best practices across the team * Mentor other engineers through constructive code reviews, technical guidance, and pair programming * Foster a culture of technical curiosity and continuous improvement * **Performance & Infrastructure** * Monitor system performance, identify bottlenecks, and proactively resolve reliability issues * Collaborate with DevOps to ensure smooth CI/CD pipelines, deployments, and infrastructure reliability * Work with containerization and orchestration tools to manage application lifecycles * **Cross-functional Collaboration** * Work closely with Product, Design, Frontend, and QA teams to deliver high-quality features * Translate product requirements into robust technical specifications * Communicate technical constraints and trade-offs clearly to non-technical stakeholders **Requirements** * 5+ years of software engineering experience, with a strong focus on backend development * Strong proficiency in Node.js and modern frameworks like NestJS * Excellent system design skills and a solid understanding of backend architecture, RESTful APIs, and distributed systems * Experience with cloud platforms (GCP preferred; AWS or Azure acceptable), containerization (Docker), and orchestration/IaC (Kubernetes, Terraform, Helm) * Proficiency with relational (e.g., PostgreSQL), NoSQL (e.g., Redis) databases, and message queues (e.g., RabbitMQ, GCP Pub/Sub, Redis Pub/Sub) * Hands-on experience with **React**, capable of implementing basic UI features for internal tools independently * Strong communication and collaboration skills, comfortable working in a fast-paced team environment * **English:** Upper-Intermediate or higher (**B2/B2+, written and spoken**). You need to be able to communicate clearly in English to work effectively in an international team and participate in architectural discussions **Nice to Have** * Experience in a **B2C startup** that has scaled to **millions of users** * Basic proficiency in **Go**; able to read, write, and maintain basic Go services without starting to learn from scratch **What We Offer** * Work on systems where performance optimizations translate to immediate user impact for millions of users * A culture of code reviews, knowledge sharing, and mentorship where the best idea wins * A fast-paced environment where your code quickly translates into real user value * We value the stability and value of what you ship, not just the number of lines of code * Flexible, remote-friendly working environment * 15 days of paid vacation * 5 days of paid days off * 5 days of paid sick leave * Maternity/Paternity leave * National holidays based on your country of stay Originally posted on [Himalayas](https://himalayas.app)