Full Stack Engineer (Server-Focused)

About HUUM

HUUM builds premium sauna solutions by combining hardware, software, and design. Our systems connect physical devices (heaters, controllers) with mobile apps and cloud services to deliver a seamless sauna experience.

As we continue to grow and expand our team, we are investing more into how our products work together as a connected system — shaping a more intelligent, responsive, and complete sauna experience for our customers.

We are now strengthening our platform team with a server-focused full-stack engineer who will take ownership of our backend systems and real-time device connectivity.

Role Description

We are looking for a Full-Stack Engineer (Server-Focused) to own and develop HUUM’s backend platform.

This role goes beyond traditional backend development — you will be responsible for building and operating a real-time IoT platform that connects devices, cloud services, and mobile applications.

You will take ownership of:

• Backend architecture
• API design
• Data models
• System reliability and performance

This is a high-impact role where your work directly influences how our products behave in real-world use.

Key Responsibilities:

Backend Ownership & Architecture

• Design and own scalable backend services and APIs
• Define system architecture and technical direction
• Own data models, database structure, and performance
• Ensure scalability, maintainability, and fault tolerance

IoT & Real-Time Systems

• Build and maintain device ↔ cloud ↔ app communication
• Implement real-time protocols (e.g. MQTT, WebSockets)
• Handle unreliable networks and offline scenarios
• Optimize system responsiveness and command latency

System Integration

• Define and maintain API contracts across systems
• Integrate backend with mobile apps and frontend services
• Work closely with firmware teams to enable device features
• Ensure clean integration with business systems (e.g. ERP, services)

Production & Reliability (You Build It, You Run It)

• Own production systems, uptime, and reliability
• Implement monitoring, logging, and alerting
• Debug and resolve incidents in live environments
• Continuously improve system performance and stability

Security & Compliance

• Apply secure coding practices across backend and APIs
• Ensure authentication, authorization, and data protection
• Contribute to compliance (e.g. GDPR, IoT security principles)

Collaboration & Product Thinking

• Work closely with product, firmware, and frontend teams
• Translate product requirements into scalable solutions
• Challenge assumptions and propose better technical approaches
• Contribute to system-level and architectural decisions

Must have:

• Strong proficiency in TypeScript / Node.js
• Strong experience with relational databases (PostgreSQL, MySQL)
• Solid experience with API design (REST and/or GraphQL)
• Experience with real-time systems (MQTT, WebSockets, event-based systems)
• Understanding of distributed systems and scalability
• Experience working with production systems (monitoring, debugging, incident handling)
• Knowledge of secure coding practices
• Experience with Git-based workflows
• Strong problem-solving and analytical thinking

Nice to have

• Experience with IoT platforms or connected devices
• Experience with cloud platforms (AWS, GCP, Azure)
• Familiarity with event-driven architectures (Kafka, RabbitMQ)
• Knowledge of microservices architecture
• Experience with CI/CD pipelines and automated deployments
• Experience with containerization (Docker, Kubernetes)
• Exposure to NoSQL databases
• Experience with monitoring tools (Datadog, Prometheus, etc.)
• Background in performance profiling and load testing