Principal Software Engineer & IoT & Full-Stack

Gerrell & Hard Ltd.; Bicester; Hybrid; GBP 80,000 - 100,000; Full time

Job summary

A dynamic technology start-up in the United Kingdom is seeking a Principal Software Engineer to lead the development of its IoT and cloud platform for EV charging solutions. You will design and build software for ultra-fast chargers, ensuring connectivity, data management, and security. The ideal candidate has over 5 years of experience in IoT software and cloud integration, with strong skills in protocols like PLC and CAN, and is comfortable in a fast-paced start-up environment. This role offers an exciting opportunity to shape core technologies in the electrification sector.

Qualifications

• 5+ years’ experience in IoT software, cloud integration or embedded systems.
• Strong skills in PLC, CAN, Modbus or similar protocols.
• Proficiency in API and cloud development (AWS/Azure, MQTT, WebSockets).

Responsibilities

• Build IoT and cloud software for charger connectivity and monitoring.
• Create telemetry and data pipelines.
• Enable secure remote control and bi‑directional communication.

Skills

IoT software

Cloud integration

Embedded systems

API development

Remote control systems

Tools

AWS

Azure

MQTT

WebSockets

Job description

Principal Software Engineer – IoT & Full-Stack

Location: Hybrid / Bicester

Type: Permanent

Salary: Competitive, market-based

TUAL Technology is an innovative, VC-backed start-up based in Bicester, developing PowerUp™ — a high‑power EV charging solution designed for grid‑constrained sites. By integrating battery storage, smart energy management, and ultra‑fast DC charging, TUAL delivers seamless electrification where traditional grid capacity falls short. Working with enterprise customers across Europe, TUAL is transforming the productivity and profitability of electric commercial vehicle fleets through a portfolio of intelligent, software‑defined, cloud and IoT‑enabled charging solutions.

The Role

We’re looking for a hands‑on Principal Software Engineer to own the design and delivery of our IoT and cloud software platform. You’ll connect our ultra‑fast chargers, manage data and remote control functions, and ensure security and scalability across our systems.

You’ll work directly with the VP Product and VP Power Electronics, shaping architecture, integrations and performance — turning ideas into real, working solutions.

What You’ll Do

• Build IoT and cloud software for charger connectivity and monitoring
• Create telemetry and data pipelines (PLC, CAN)
• Enable secure remote control and bi‑directional communication (MQTT/WebSockets)
• Deliver OTA firmware updates and REST APIs (OCPP/OCPI)
• Develop secure, scalable cloud infrastructure (AWS IoT, Azure, etc.)
• Collaborate closely with hardware and IoT partners to integrate systems end‑to‑end

Your Background

• 5+ years’ experience in IoT software, cloud integration or embedded systems
• Strong skills in PLC, CAN, Modbus or similar protocols
• Proficiency in API and cloud development (AWS/Azure, MQTT, WebSockets)
• Knowledge of secure firmware updates and encryption (TLS, AES)
• Comfortable working autonomously in a fast‑moving start‑up environment
• Background in EV charging, energy storage or industrial automation is a plus

Why Join

This is a chance to build the full IoT and cloud platform behind PowerUp™ — from architecture to deployment. You’ll shape a core technology in a growing, well‑funded start‑up tackling real‑world challenges in electrification.