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Principal Backend Engineer (Node, Java, Ruby) at Vizrt. You will architect, develop, and optimize critical backend systems powering our platforms. You'll drive the full software development lifecycle—from technical discovery to solution design, implementation, testing, code reviews, and operations. You’ll work primarily with Node.js, Java, and Ruby on Rails, leveraging modern frameworks and best practices. This is a unique opportunity to apply your expertise across multiple languages and influence engineering culture at scale. . Key Responsibilities . . Work closely with Product, Design, and DevOps teams to develop backend services that power innovative product features. . . Design, build, and maintain scalable backend applications using Node.js, Java (Spring, Jersey), and Ruby on Rails. . . Make key decisions on system architecture, including microservices, data storage, caching strategies, and real-time messaging. . . Lead efforts to ensure code quality through automated testing, code reviews, regular refactoring, and thorough documentation. . . Mentor and support engineering teammates by sharing backend development expertise and promoting best practices. . . Optimize the backend for improved performance, scalability, and security. . . Share responsibility for system reliability by participating in the on-call rotation and developing fault-tolerance solutions. . . Continuously improve our architecture, development standards, and deployment pipelines.. . . 8+ years of experience designing, developing, and operating backend services in production environments. . . Deep expertise in Node.js (preferably with hapi.dev), Java (Spring, Jersey), and Ruby on Rails. . . Strong working knowledge of PostgreSQL, Redis, Elasticsearch, and integration patterns. . . Solid understanding of REST APIs and asynchronous/messaging systems such as Kafka. . . Hands-on experience with containerization (Docker), CI/CD pipelines, and cloud platforms (AWS, GCP, or Azure). . . Proven leadership in driving architectural standards and mentoring engineering teams. . . Proven track record of designing and scaling distributed, highly available backend systems supporting millions of users and high transaction volumes. . . Demonstrated leadership in driving the adoption of modern CI/CD pipelines, resulting in a measurable reduction of deployment times and increased developer productivity . . Proven experience implementing security and compliance best practices in cloud environments, leading to measurable reductions in vulnerabilities and successful audit outcomes. . . Proficient in testing methodologies, including unit, integration, and end-to-end testing. . . Excellent problem-solving and communication skills, with experience collaborating on distributed or remote teams. . . Fluent in spoken and written English. . . Nice to Have . . Familiarity with TypeScript, Kotlin, or Elixir. . . Exposure to DevOps practices: Terraform, Kubernetes, GitOps. . . Previous contributions to open-source backend frameworks. . . Familiarity with modern monitoring, logging, and tracing tools. . . Exposure to the broadcasting industry.. . Company Location: Portugal.