Senior Software Engineer - Java/Embedded Systems/IOT

Senior Software Engineer with strong Java, Spring Boot and Kafka or distributed systems experience , alongside knowledge of IoT, Embedded systems or firmware, is required to join an innovative, well-funded early-stage technology start-up developing next-generation SaaS solutions for the renewable energy sector.

Location: Cambridge (but you can work remotely or hybrid if local)

This is an opportunity to help design and build a scalable, cloud-native platform connecting software, data and physical energy infrastructure. We're particularly interested in Java Engineers with experience or an interest in IoT, Embedded technologies and connected devices , who enjoy solving complex engineering challenges.

Key skills required for the Senior Software Engineer

• Strong Java and Spring Boot experience , building scalable applications, APIs and microservices.
• Kafka or distributed systems experience , including event-driven architectures and asynchronous messaging.
• Good knowledge of Docker and Kubernetes, including containerisation and cloud-native deployments.
• Experience developing resilient, scalable SaaS applications, ideally using AWS.
• Strong software engineering fundamentals, automated testing and continuous delivery.
• Full Stack development experience, ideally with React, would be beneficial.

Particularly desirable - IoT, Embedded systems and connected devices:

• Embedded systems or firmware development , including Embedded Linux environments.
• IoT applications, connecting sensors, hardware and physical devices to cloud platforms.
• Raspberry Pi or similar devices, including edge computing and IoT gateways.
• Communication protocols such as MQTT and Modbus (TCP/RTU) or other industrial protocols.
• Experience with network-connected devices, telemetry, device connectivity and data ingestion.
• Exposure to industrial equipment, smart meters, energy assets or connected infrastructure.
• Experience in one or more of these areas would be particularly attractive; you don't need to tick every box.

What you'll do as a Senior Software Engineer

• Design and develop scalable Java/Spring Boot microservices and APIs.
• Build reliable distributed systems using Kafka and event-driven architectures.
• Develop software supporting IoT connectivity, device integration and data processing.
• Contribute to device-to-cloud communication and integration with connected hardware.
• Work with Docker, Kubernetes and cloud-native technologies.
• Collaborate with engineers and product stakeholders on technical design, architecture and delivery.
• Contribute to code reviews, automated testing and continuous improvement.

Why this role?

• Modern engineering: Work with Java, Spring Boot, Kafka, Docker, Kubernetes and cloud-native technologies.
• IoT and Embedded technology: Opportunity to work at the intersection of software, connected devices and physical infrastructure.
• Technical ownership: Help shape the architecture and development of a new SaaS platform.
• Growing start-up: Join a recently funded technology business with significant opportunities to influence product development.
• Meaningful impact: Build technology supporting renewable energy and the transition to a greener future.
• Collaborative culture: Work alongside experienced engineers who value autonomy, technical excellence and continuous improvement.

This role would particularly suit a Senior Java/Spring Boot Engineer with Kafka or distributed systems experience, knowledge of Docker and Kubernetes, and exposure to IoT, Embedded systems, firmware, Raspberry Pi, MQTT or Modbus.