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

📌 Back End Developer (Kolkata)
🏢 Distronix
📍 Kolkata