At Fuse, we’re building a fully integrated energy company. From solar and wind to power trading and distributed energy installations. We sell directly to energy consumers, cutting out the middleman to reduce costs and pass on savings to customers.But we’re not stopping there.We’re also building the Energy Network — a decentralized platform of smart devices, shifting usage to off-peak hours, and helping balance the grid. This network is the backbone of a stable, intelligent, and distributed energy system that drives down electricity costs.We’re looking for a Senior IoT Engineer to help design, build, and scale the connected hardware powering the Energy Network. This is a hands-on role that spans embedded systems, networking, cybersecurity, and fleet management — from prototype to mass deployment. You’ll be responsible for ensuring resilient connectivity, secure provisioning, and robust telemetry across thousands of distributed energy devices.You’ll play a critical role in shaping how our devices connect, communicate, and evolve securely at scale.<h3>Responsibilities</h3>Connectivity &amp; Networking:<ul><li>Design and implement connectivity stacks across Ethernet, Wi-Fi, Thread, Zigbee, and BLE.</li><li>Develop and optimise secure, reliable messaging using MQTT, CoAP, HTTP, or WebSockets.</li><li>Implement precise device time synchronisation with NTP or PTP. </li></ul>Device Security &amp; OTA Management:<ul><li>Build secure boot flows, key and certificate provisioning, and hardware attestation using TPMs or secure elements.</li><li>Develop signed firmware update pipelines, and A/B or rollback OTA update mechanisms.</li><li>Lead threat modelling, software bill of materials (SBOM) generation, and vulnerability management programs. </li></ul>Edge &amp; Cloud Integration:<ul><li>Integrate devices with cloud IoT services (AWS, Azure, GCP) and distributed energy resource (DER) protocols.</li><li>Define and track telemetry and health metrics for device observability and predictive maintenance. </li></ul>Compliance &amp; Testing:<ul><li>Ensure designs comply with safety, EMC, radio, and grid interconnection standards.</li><li>Prepare test plans and certification artefacts, and coordinate with notified bodies and test labs.</li><li>Work closely with manufacturing to support Engineering, Design, and Production validation cycles. </li></ul>Cross-Functional Collaboration:<ul><li>Partner with firmware, hardware, power electronics, mechanical, and security teams to deliver production-ready devices.</li><li>Contribute to design reviews, technical documentation, and interface specifications.</li><li>Mentor peers on embedded security, networking, and protocol best practices. </li></ul>Requirements<ul><li>Bachelor’s degree in Electrical Engineering, Computer Engineering, Computer Science, or equivalent practical experience.</li><li>3+ years of experience shipping connected embedded products.</li><li>Strong proficiency in C/C++ on RTOS (e.g., Zephyr, FreeRTOS), plus Python scripting for testing and automation.</li><li>Deep understanding of IP networking, TLS 1.2/1.3, mTLS, PKI, and secure device provisioning at scale.</li><li>Experience with OTA frameworks, bootloaders, and CI/CD pipelines for firmware.</li><li>Practical experience with EMC/RF design, antenna bring-up, and factory testing.</li><li>Working knowledge of cybersecurity and privacy standards (IEC 62443, ISO 27001, ETSI EN 303 645, GDPR).</li><li>Skilled in debugging with logic and protocol analysers, network sniffers (e.g., Wireshark), and cloud observability tools.</li></ul>Benefits<ul><li>Competitive salary</li><li>Biannual bonus scheme</li><li>Fully expensed tech to match your needs</li><li>Paid annual leave</li><li>Breakfast and dinner for office based employees</li></ul>

We are building a full stack renewable energy company to accelerate global renewable energy transition. We are based in London, New York, Texas. We've raised $78m from top tier investors like Balderton, Lakestar, Accel, Creandum, Lowercarbon, and Ribbit. Energy is broken &ndash; We are here to fix it.

Senior IoT Engineer - Smart Devices

About the Job

About the Company

Fuse Energy

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