👋 Suman — (Backend, Microservices, Industrial IoT)

Senior engineer focused on secure, high‑throughput microservices and device‑to‑cloud platforms. Previously built industrial IoT and ARM firmware; now leading backend services in Java, Python, and Go.

What I’m building now

• Microservices in Java (Spring Boot), Python (Django/FastAPI), Go
• REST APIs, event‑driven systems with Message Brokers and MQTT
• AWS (ECS/Lambda, API Gateway, IoT Core, SQS), Docker, Kubernetes, Terraform
• Data: PostgreSQL, MySQL, MongoDB, Redis; time‑series: InfluxDB
• Observability: Grafana, OpenSearch
• CI/CD: GitHub Actions, Jenkins; quality gates and automated testing

Where I come from (Firmware & Industrial IoT)

• ARM Cortex‑M (STM32, TI SimpleLink/Tiva); C/C++/Embedded C
• RTOS (FreeRTOS, Zephyr), DMA/SPI/I2C/UART/CAN; BLE, LoRaWAN
• Industrial protocols: Modbus (RTU/TCP), OPC‑UA, RS‑485, DLMS, OCPP
• Secure boot, bootloaders, OTA updates, HAL drivers, power management
• Device→cloud: MQTT, device shadows/digital twins, fleet management, edge gateways
• LoRaWAN gateways and end‑devices; network servers (ChirpStack, TTN), ADR, Class A/B/C
• Software‑Defined Radio (SDR) prototyping and RF diagnostics (GNU Radio), spectrum analysis
• IoT edge gateways (Yocto/Linux), protocol translation, offline‑first buffering, OTA at the edge

Architecture & leadership

• System design, SLOs/error budgets; multi‑tenant, multi‑region
• Distributed systems: idempotency, backpressure, retries, circuit breakers
• Security: OAuth2/OIDC, mTLS, JWT, secrets management, threat modeling
• Reliability & performance: load testing, profiling, capacity planning
• Mentorship, code reviews, hiring loops, cross‑team collaboration

Selected problem spaces I’ve owned

• Robust IoT device communications
• Telemetry ingestion from edge → cloud
• OTA and device lifecycle platform with zero‑downtime rollouts
• Event‑driven payments/orders with exactly‑once semantics
• Multi‑tenant RBAC and policy enforcement for platform services
• LoRaWAN gateway rollouts and SDR‑based RF diagnostics in industrial environments

Tech I lead with

• Languages: Java, Python, Go, C, SQL
• Backend: Spring Boot, Hibernate, Django/FastAPI, gRPC, JUnit
• Data & Messaging: PostgreSQL, MySQL, MongoDB, Redis, MQTT, SQS, ActiveMQ, Kafka, , Timestream/InfluxDB
• Cloud & Ops: AWS (ECS/Lambda, API Gateway, IoT Core, S3, CloudWatch), Docker, Kubernetes
• Observability: Grafana, OpenSearch
• IoT & Edge: ARM Cortex‑M, STM32, TI SimpleLink/Tiva, FreeRTOS, Modbus, OPC‑UA, BLE, LoRaWAN, OCPP, SDR (GNU Radio), Edge gateways (Yocto/Linux)
• Security: HMAC, OAuth2, mTLS, JWT, Vault/Secrets Manager

Let’s connect

• Email: sumancvb@gmail.com
• LinkedIn: linkedin.com/in/sumancvb

Thanks for visiting! If you have an idea to build, let’s make it real. 🚀