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Senior Backend Engineer at Scrambly. About the Role. 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.. Key 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. 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). 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. Hands-on experience with . React. , capable of implementing basic UI features or internal tools independently. Company Location: Spain.