Senior Backend Engineer

About us: Scrambly is the most rapidly growing Italy-based tech startup operating in the performance marketing and rewarded advertising space. Our platform helps users discover and test new apps, games, and services - and get rewarded for it. With millions of installs, we’re focused on scaling our mobile product and building a seamless user experience. Now we are looking for a Senior Backend Engineer to join the team building the core systems behind Scrambly. In this role, you will be solving complex scalability challenges for a platform serving millions of users globally. 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. You will focus on: Designing and building high-performance services. Architecting scalable and maintainable backend systems. Mentoring engineers and elevating code quality standards. Identifying bottlenecks and optimizing system performance. Collaborating with DevOps to streamline infrastructure and deployments. Bridging the gap between complex technical constraints and product goals. Responsibilities: Design & Implementation: Design, build, and maintain high-performance, scalable backend services and APIs using Node.js (NestJS). Write clean, maintainable, and testable code 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: Experience: 5+ years of software engineering experience, with a strong focus on backend development. Tech Stack: Strong proficiency in Node.js and modern frameworks like NestJS. System Design: Excellent system design skills and a solid understanding of backend architecture, RESTful APIs, and distributed systems. Infrastructure: Experience with cloud platforms (GCP preferred; AWS or Azure acceptable), containerization (Docker), and orchestration/IaC (Kubernetes, Terraform, Helm). Databases & Messaging: Proficiency with relational (e.g., PostgreSQL), NoSQL (e.g., Redis) databases, and message queues (e.g., RabbitMQ, GCP Pub/Sub, Redis Pub/Sub). Collaboration: Strong communication and collaboration skills, comfortable working in a fast-paced team environment. Huge Plus: Scale : Experience in a B2C startup that has scaled to millions of users. Additional Stack : Basic proficiency in Go; able to read, write, and maintain basic Go services without starting to learn from scratch. Frontend Autonomy: Hands-on experience with React, capable of implementing basic UI features or internal tools independently. 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 Full-time & fully remote position 15 days of paid vacation days 5 days of paid days off 5 days of paid sick leave Maternity/Paternity leave National holidays by the country of your stay An annual allowance of $100 for self-improvement activities