Mid-Senior Java IoT Systems Engineer - Remote

About the Role

We are seeking a Java IoT Systems Engineer to join our team remotely. In this role, you will architect and build the backbone of our hospital system, ensuring sub-second latency for patient check-ins and 100% reliability for indoor navigation and medical procedure tracking.

What You'll Do

• Design and implement a scalable Java backend (Spring Boot/Quarkus) to manage real-time data streams from 1000+ standalone Android wearables.
• Architect the messaging layer using MQTT or WebSockets to push directional text and alerts to watches without delay.
• Develop Java-based drivers and abstraction layers for USB NFC Readers and BLE Gateway events.
• Build the core logic that handles complex patient journeys, such as detecting a "Ghost Exit" via BLE signal strength algorithms.
• Create a surveillance dashboard to monitor IoT endpoint health (Battery, Connectivity, UVC Sanitization status) in real-time.
• Implement end-to-end AES encryption for all data in transit and manage secure device authentication (Mutual TLS/Oauth2).

Requirements

• 5+ years of experience with Java 17/21+, focusing on high-concurrency, multi-threading, and reactive programming (Project Reactor/RxJava).
• Hands-on experience with IoT protocols such as MQTT (Eclipse Paho/HiveMQ), AMQP, or gRPC.
• Expert-level knowledge of Spring Boot, Spring Integration, and Spring Cloud.
• Experience using JNI (Java Native Interface) or JNA to communicate with serial/USB hardware.
• Experience with Time-Series Databases (InfluxDB/TimescaleDB) and Message Brokers (RabbitMQ/Kafka).
• Familiarity with Docker, Kubernetes, and CI/CD pipelines (GitLab/GitHub Actions) for IoT deployments.

Nice to Have

• Previous work with Real-Time Location Systems in healthcare, logistics, or manufacturing.
• Understanding of the Android OS lifecycle and how backend services interact with "Kiosk Mode" devices.
• Knowledge of ISO 27001 or HIPAA compliance regarding data transmission in medical environments.

What We Offer

• Remote work flexibility with a focus on work-life balance.
• Visa sponsorship for eligible candidates.
• Opportunity to work on cutting-edge wearable technology that saves lives.
• Collaborative and innovative team environment.
• Professional development opportunities and career growth.