Backend Developer – Node.js

About the Role: We are looking for a Backend Developer experienced in Node.js, MongoDB and Redis to develop scalable APIs, manage real-time IoT data, optimise large datasets and support production infrastructure. Key Responsibilities:

• Develop and maintain REST APIs using Node.js/Express.
• Implement authentication, access control, rate limiting and API usage tracking.
• Design and optimise MongoDB aggregation pipelines, indexes and queries for large datasets.
• Build real-time IoT data ingestion using MQTT/Mosquitto.
• Use Redis for caching, rate limiting and usage tracking.
• Manage Ubuntu servers, Nginx, SSL/TLS, Certbot and systemd services.
• Develop cron-based data processing, aggregation and anomaly-detection jobs.
• Integrate Razorpay subscriptions, webhooks and B2B billing.
• Troubleshoot production issues using logs, explain() and other debugging tools.
• Work with Git and follow collaborative development practices. Required Skills:
• 2+ years backend development experience.
• Strong Node.js/Express and REST API knowledge.
• Strong MongoDB experience, including aggregation, indexing and query optimisation.
• Experience with Redis.
• Knowledge of MQTT/IoT systems.
• Hands-on Linux/Ubuntu server administration.
• Working knowledge of Nginx, TLS/Certbot and systemd.
• Understanding of API security and authentication.
• Strong debugging and problem-solving skills. Nice to Have:
• Experience with IoT, environmental or sensor data platforms.
• Razorpay/payment gateway experience.
• AWS, OCI or other cloud infrastructure experience.
• Experience with ESP32, Mosquitto or geospatial data. Experience: 2+ Years Project: www.aqi.in Employment Type: Full-time Type of Work: In-Office Working Days: Monday-Saturday Pay: ₹30,000.00 - ₹35,000.00 per month Benefits
• Paid sick time Ability to commute/relocate:
• Delhi: Reliably commute or planning to relocate before starting work (Required) Education:
• Bachelor's (Preferred) Experience:
• MongoDB: 2 years (Required) Location:
• Delhi (Required) Work Location: In person