Location : Remote Experience : 3-5 years About the Job This is a full-time role for a Senior Backend Developer (SR1) specializing in Node.js . We are seeking an experienced developer with deep JavaScript/TypeScript expertise to lead technical initiatives, design robust architectures, and mentor team members. In this role, you'll provide technical leadership, implement complex features, and drive engineering excellence across projects. A strong emphasis is placed on candidates who not only understand but actively implement best practices in testing and object-oriented design to build highly reliable and maintainable systems. The job location is flexible with preference for the Delhi NCR region. Responsibilities Design and plan efficient solutions for complex problems, ensuring scalability and security, applying principles of robust software design and testability. Independently lead teams or initiatives, ensuring alignment with project goals. Prioritize and maintain quality standards, focusing on performance, security, and reliability, including advocating for and ensuring strong unit and functional test coverage. Identify and resolve complex issues, ensuring smooth project progress. Facilitate discussions to align team members on best practices and standards. Promote continuous improvement through effective feedback and coaching. Guide and mentor team members, providing support for their professional growth. Contribute to talent acquisition and optimize team processes for better collaboration. Lead complex project components from design to implementation. Provide technical project guidance and develop risk mitigation strategies. Drive technical best practices and implement advanced performance optimizations. Design scalable, efficient architectural solutions for backend systems. Propose innovative technological solutions aligned with business strategies. Develop internal training materials and knowledge sharing resources. Requirements Technical Skills Bachelor's or Master's degree in Computer Science, Engineering, or related field. 3-5 years of professional experience in Node.js backend development. Proven experience in designing and implementing comprehensive unit and functional tests for backend applications, utilizing frameworks like Jest, Mocha, Supertest, or equivalent. Solid understanding and practical application of Object-Oriented Design Patterns (e.g., Singleton, Factory, Strategy, Observer, Decorator) in building scalable, flexible, and maintainable Node.js applications. Expert knowledge of advanced debugging techniques (Node Inspector, async hooks, memory leak detection). Mastery of advanced TypeScript patterns including utility types and mapped types. Deep understanding of API security including JWT, OAuth, rate limiting, and CORS implementation. Extensive experience with caching strategies using Redis/Memcached. Proficiency with HTTP caching mechanisms including Cache-Control headers and ETags. Strong knowledge of security protocols including HTTPS, TLS/SSL, and data encryption methods (bcrypt, Argon2). Experience with static analysis tools for code quality and security. Solid understanding of GraphQL fundamentals including queries, mutations, and resolvers. Experience with message brokers like RabbitMQ, Kafka, or NATS for distributed systems. Proficiency with cloud providers (AWS, GCP, Azure) and their core services. Experience with serverless frameworks including AWS Lambda, Google Cloud Functions, or Azure Functions. Knowledge of cloud storage and database solutions like DynamoDB, S3, or Firebase. Expertise in logging and monitoring security incidents and system performance. Soft Skills Excellent cross-functional communication skills with ability to translate complex technical concepts. Technical leadership in discussions and decision-making processes. Effective knowledge transfer abilities through documentation and mentoring. Strong mentorship capabilities for junior and mid-level team members. Understanding of broader business strategy and ability to align technical solutions accordingly. Ability to lead complex project components and provide technical guidance. Strong problem-solving skills and systematic approach to troubleshooting. Effective risk assessment and mitigation planning. Collaborative approach to working with product, design, and frontend teams. Proactive communication style with stakeholders and team members. Ability to balance technical debt, feature development, and maintenance needs. Additional Preferred Qualifications Experience with load balancing and horizontal/vertical scaling strategies. Knowledge of database optimization techniques including connection pooling, replication, and sharding. Proficiency with Node.js performance tuning, including streams and async optimizations. Knowledge of advanced access control systems such as Attribute-based access control (ABAC) and OpenID Connect. Experience with CDN configuration and server-side caching strategies. Knowledge of event-driven architecture patterns and Command Query Responsibility Segregation (CQRS). Experience with load testing tools like k6 or Artillery. Familiarity with Infrastructure as Code using Terraform or Pulumi. Contributions to open-source projects or advanced technical certifications. Experience leading major feature implementations or system migrations.