Senior Embedded Software Engineer; EV Charging

Senior Embedded Software Engineer (EV Charging)

Location: Tyseley, Birmingham (hybrid - 2 days per week on site)

Job Type: Permanent, full-time

Salary: TBC plus benefits

Department: Engineering / Product Development

Voltempo is developing rapid DC Hyper Charging solutions for a range of commercial vehicle sectors, initially in the UK and progressively internationally as the transport sector electrifies. The company holds several international patents and is engaged in the end-to-end design, supply, site commissioning and servicing of charging solutions for commercial vehicles. The business is scaling, well supported by both its international shareholders and its role in the UK Government’s eFreight
2030 programme, where it is leading a consortium of UK logistics fleet operators to deploy the UK’s first eHGV charging network.

We are looking for a Senior Embedded Software Engineer to play a key role in developing megawatt-scale EV charging systems. Your software will run in live depot infrastructure, including the UK’s first eHGV charging network. When a truck fails to charge, a fleet misses deliveries - so reliability and the operator’s experience are key.

This is a hands‑on, high-impact role suited to someone who thrives in a scale‑up environment – someone who can take ownership from concept through to production and in‑service support, while helping shape both the product and the way we engineer it.

You will help architect and develop the core firmware and embedded software powering our patented Hyper Charger EVSE, bridging low-level microcontroller firmware and higher-level supervisory applications, and building the team’s depth in EV charging protocols (OCPP, IEC 61851, ISO 15118). The future will include reviewing make/buy decisions on integrated hardware, firmware and embedded software to optimise for cost, performance, reliability and maintainability.

Expect a genuine mix of work: as a guide, roughly 60% new development, 30% integration and test, and 10% supporting deployed chargers. If you are only interested in greenfield feature development, this is not the role. If you like owning a system end to end – from requirements through validation to diagnosing a fault on a live site – you’ll thrive.

Embedded Development & Architecture

• Elicit and define requirements: perform discovery and definition to scope features and functions, enabling validation and test.
• Design, develop and maintain clean, modular and efficient embedded software in modern C++, working to MISRA guidelines.
• Bring up and develop firmware for high-performance microcontrollers (e.g. STM
  32).
• Architect and implement communication gateways between charger subsystems, vehicles and cloud services.

Protocols & Connectivity

• Implement and optimise hardware‑level and bus communication protocols, including CAN and Modbus RTU over RS485.
• Integrate the charging system with our cloud platform via OCPP (1.6J/2.0.1/2.1) over Web Sockets, and implement MQTT‑based telemetry for real‑time monitoring.
• Integrate critical hardware peripherals, including energy meters, Insulation Monitoring Devices (IMDs), power modules and charging controllers.
• Apply and help evolve our approach to charger cybersecurity: OCPP security profiles, TLS and certificate handling, secure boot and signed over‑the‑air firmware updates.

Integration, Test & In‑Service Support

• Work with the hardware team and external outsource partners on board bring‑up, diagnostics and system validation, using oscilloscopes, CANalyzer, protocol testers and electronic loads.
• Support site commissioning and the diagnosis and resolution of issues on deployed chargers, working directly with customers where needed.
• Design for serviceability and observability: structured logging, remote diagnostics and safe remote update of charger fleets.
• Build and improve automated test infrastructure (unit tests, CI and hardware‑in‑the‑loop) to reduce the team’s manual test burden.
• Work safely around high-voltage DC equipment, following and contributing to our safe working practices (training provided).

Quality & Mentorship

• Champion rigorous engineering practice: code review, static analysis,…