Senior Software Developer

KO2’s client are looking for an experienced Senior Software Developer to play a key role in designing and building scalable, cloud-native systems that power connected IoT devices.

This is an exciting opportunity to work at the intersection of hardware and software—developing backend services that enable secure device communication, high-volume data ingestion, and the APIs that drive customer-facing applications.

You’ll be responsible for building and evolving the backend platform that supports large fleets of IoT devices, with a strong focus on scalability, reliability, and security. Working within a collaborative engineering environment, you’ll also contribute to architectural decisions and mentor other developers.

Key Responsibilities:

• Design, develop, and maintain backend services for IoT platforms
• Build and optimise real-time data ingestion pipelines handling high-volume telemetry and events
• Develop secure, scalable RESTful and/or GraphQL APIs
• Implement observability, reliability, and cost optimisation across cloud infrastructure
• Ensure robust IoT security practices, including secure device provisioning and communication
• Lead technical discussions, support code reviews, and mentor junior team members
• Collaborate with cross-functional teams including product, embedded, and data engineering

Key Skills & Experience:

• Strong backend or platform engineering experience, ideally within IoT or distributed systems
• Deep knowledge of AWS Technologies (IoT Core, Lambda, DynamoDB, Kinesis, SQS, API Gateway)
• Proficiency in Python, Node.js, Go, or Java
• Experience with MQTT and event-driven architectures
• Proven track record of building scalable data ingestion pipelines
• Solid understanding of microservices and cloud design patterns
• Experience with edge/embedded integrations
• Familiarity with time-series databases
• Knowledge of digital twins or industrial IoT protocols
• Any experience in a technical leadership or team leader role.

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