Back End Developer

Job Title: Senior Backend Engineer — Cloud & Infrastructure

Employment Type: Full-Time, Permanent

Location: Salt Lake, Kolkata

Work Mode: On-site

We need a Senior Backend Engineer who can reliably manage the server-side of our IIoT products — from setting up MQTT brokers to persisting data in Postgres database transiting securely over our own Nginx/PM2 servers running on EC2/on-prem installations and backend APIs written in NodeJS packaged in Docker containers

Backend Development

• Build and maintain REST APIs using NodeJS and NestJS/TypeORM
• Design PostgreSQL schemas and manage data with TypeORM — including migrations and query optimisation
• Subscribe to MQTT topics, process device telemetry, and persist it reliably
• Define API contracts with firmware and frontend teams

Infrastructure & Deployment

• Deploy services on AWS: EC2, VPC, Security Groups, Load Balancers, CloudWatch
• Containerise and run backend services using Docker
• Set up and manage Nginx / PM2 / Apache for reverse proxying, SSL termination, and load balancing
• Monitor service health via CloudWatch and respond to production incidents

Networking & Connectivity

• Configure cloud networking — VPC, subnets, security groups, routing
• Manage MQTT connectivity between IoT field devices and backend services
• Troubleshoot connectivity issues across device, server, and cloud layers

Scripting & Automation

• Write scripts for deployment, configuration, and maintenance using JS, Bash, Shell, YAML, and JSON
• Maintain environment configs, secrets, and deployment manifests

• NodeJS / NestJS: Production API development; modular NestJS architecture
• PostgreSQL / TypeORM: Schema design, migrations, relational modelling, query optimization, indexing, sharding
• MQTT: Device telemetry ingestion; broker connectivity; topic design
• Networking: TCP/IP, DNS, HTTP/HTTPS, ports, firewall rules, VPC routing
• AWS: EC2, Security Groups, VPC, CloudWatch, Load Balancers, Lambda — in production
• Nginx / PM2 / Apache: Reverse proxy setup, SSL termination, load balancing
• Scripting: JS, Bash, Shell, YAML, JSON — for automation and config

Experience

• 5+ years of backend engineering in a production environment
• Hands-on AWS experience in a live deployed system — not just sandbox or learning
• Exposure to IoT or device-connected backends is a strong plus
• Comfortable owning your work end-to-end in a small engineering team

Contact: [HIDDEN TEXT]

Skills Required
Docker, Nodejs, Shell, Ec2, Bash, Mqtt, Yaml, Json, Nginx, Nestjs, Aws, Postgresql, TypeORM