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