Job Title: Senior Backend Engineer 

Experience Required: 5-10 Years 

Location: Mumbai 

Employment Type: Full-Time 

Department: Engineering - Backend Development 

About the Role 

We are seeking an experienced Senior Backend Engineer to join our team. The ideal candidate will have strong expertise in building scalable, high-performance backend systems with Node.js and cloud technologies. You will be responsible for developing and maintaining our cloud-based PC services platform that serves millions of users. 

Key Responsibilities 

• Design, develop, and maintain robust RESTful APIs and WebSocket services for real-time communication 
• Build and optimize scalable microservices architecture using Node.js and Express.js 
• Implement and manage cloud infrastructure on Azure and Google Cloud Platform 
• Design and optimize database schemas and queries for MongoDB 
• Develop real-time features using WebSocket protocols and SocketCluster 
• Implement secure authentication and authorization mechanisms (JWT, OAuth) 
• Build and maintain background job processing systems using message queues 
• Integrate with third-party APIs and services 
• Write clean, maintainable, and well-documented code 
• Implement monitoring, logging, and alerting solutions 
• Participate in code reviews and maintain code quality standards 
• Mentor junior developers and contribute to technical documentation 
• Collaborate with frontend developers, DevOps, and product teams 

Required Technical Skills 

Core Technologies (Must Have) 

• Node.js (v18+): 5+ years of production experience with Node.js backend development 
• Express.js: Strong expertise in building RESTful APIs with Express.js framework 
• MongoDB: 3+ years experience with MongoDB, Mongoose ORM, schema design, and query optimization 
• Redis: Experience with caching strategies, session management, and distributed locks using Redis 
• JavaScript/ES6+: Advanced proficiency in modern JavaScript, asynchronous programming, and design patterns 

Cloud & Infrastructure 

• Azure Services: Hands-on experience with Azure Event Hubs, Azure DevOps, and Azure deployment 
• Google Cloud Platform (GCP): Experience with GCP Compute Engine, Cloud Storage, and Pub/Sub 
• Docker: Containerization experience and Docker deployment strategies 
• CI/CD: Experience with Azure Pipelines and automated deployment workflows 

Real-time & Messaging 

• WebSocket: Strong understanding of WebSocket protocol and real-time communication patterns 
• Message Queues: Experience with AMQP, RabbitMQ, or similar message broker systems 
• Background Jobs: Experience with job scheduling systems (Agenda, Bull, or similar) 

Authentication & Security 

• JWT/OAuth: Strong understanding of token-based authentication and authorization 
• Security Best Practices: Knowledge of OWASP Top 10, input validation, rate limiting, and API security 
• Encryption: Experience with bcrypt, password hashing, and data encryption 

API Development & Documentation 

• RESTful API Design: Expertise in designing scalable and maintainable REST APIs 
• API Documentation: Experience with Swagger/OpenAPI specification 
• API Versioning: Understanding of API versioning strategies 

Development Tools & Practices 

• Git: Proficient with Git workflows, branching strategies, and code collaboration 
• Testing: Experience with Jest, unit testing, integration testing, and test-driven development 
• Code Quality: Familiarity with ESLint, Prettier, and code review processes 
• Monitoring: Experience with Prometheus, application monitoring, and observability