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Ohme is on a mission to accelerate the global transition to clean, affordable energy. We do that by serving as an integrated hardware and software smart-grid platform, focused on the residential EV charging market.
The worlds of energy, transport and artificial intelligence are colliding and Ohme is at the heart of this new era. By using technology and data integrations to connect cars, chargers, people, energy providers and more, Ohme has a powerful platform that puts the consumer at the core.
Ohme has been selling its chargers to consumers since mid 2019 and has had exponential growth since. We are now operating in multiple countries and have partnerships with the likes of VW, Mercedes, Octopus Energy, and other innovative brands.
We are scaling up the business and are building out the team for rapid growth. If you’re interested joining a fast-growing cleantech venture on a data and AI-first journey to speed up the global transition to clean, affordable energy, read on!
We are looking for a Senior Wireless & Connectivity Engineer to join our team.
Required
- 8+ years' experience in embedded C software development
- Deep understanding of networking fundamentals: OSI/ISO model (layers 2-7), TCP/IP stack architecture, UDP, IPv4/IPv6
- Strong hands-on experience with networking protocols: MQTT, HTTP/HTTPS, WebSockets, TLS/SSL, DNS
- Proven experience integrating and optimizing cellular modems (LTE, LTE-M, NB-IoT) including AT command interfaces, PPP, and modem control
- Proven experience integrating Wi-Fi modules (ESP32, RS9116, etc.) including configuration, authentication (WPA2/WPA3), and power management
- Expert-level experience with embedded networking stacks (LwIP, NetX, NetX-Duo, etc.) including configuration, optimization, and troubleshooting
- Experience developing reliable IoT connectivity solutions: implementing reconnection strategies, handling network failures, optimizing connection uptime and data throughput
- Experience with RTOSes (FreeRTOS, ThreadX) in network-intensive applications
- Strong understanding of digital electronics and hardware-firmware interfaces
- Experience with full software development lifecycle from concept to production
- Good verbal and written communication skills
Desirable
- Experience with socket programming and raw packet handling
- Knowledge of network security best practices for IoT devices
- Experience with network debugging tools (Wireshark, tcpdump, protocol analyzers)
- Familiarity with cellular network infrastructure and troubleshooting (signal strength, registration, roaming, APN configuration)
- Knowledge of embedded TLS/DTLS implementations (mbedTLS, WolfSSL)
- Experience with OTA firmware updates over cellular/Wi-Fi
- Experience of C++ in an embedded environment
- Experience of building test harness applications using Python
- Experience of using CMake as build system
- Familiar with Zephyr RTOS
- Familiar with writing manual and automated test cases
- Familiar with Agile principles and best practices such as peer review, pair programming, etc
- Familiar with reading schematics and datasheets for electronic components
What you'll do:
- Design and implement robust connectivity solutions for our EVSE products, ensuring reliable communication between chargers and Ohme cloud services
- Integrate, configure and optimize cellular modems and Wi-Fi modules into embedded systems
- Implement and optimize networking stacks to maximize uptime, minimize latency, and ensure efficient data throughput
- Develop connection management strategies: automatic reconnection, network failover, connection health monitoring
- Debug complex network issues: diagnose connectivity failures, analyse packet traces, troubleshoot protocol-level problems across the full network stack
- Design, code and test firmware for embedded systems with emphasis on network communications
- Contribute to codebase architecture improvements for scalability
- Build and maintain automated testing harnesses for connectivity and network functionality
- Provide third-level support for hardware and firmware issues, with focus on connectivity diagnostics
- Create and execute test cases for network reliability and performance
- Maintain released products and connectivity features
Our benefits:
- Competitive salary and bonus
- Hybrid office / remote-working practices (2 days a week in office)
- Private Health Insurance
- Life Assurance Scheme with death in service benefit of 4x salary
- Income Protection Scheme for long term illness
- Ride to Work Scheme
- Season Ticket Loan to spread cost of travel over 12 months
- Eye Test every 2 years
Ohme is an equal opportunity employer. Diversity, Equity and Inclusion are at the heart of what we do and we encourage a culture where everyone can be themselves at work. We actively seek out a diverse range of talent and our policies ensure that every job application and employee is treated fairly, with equal opportunity to succeed and to feel included.
Ohme London, England Office
125-130 The Strand, London, United Kingdom, WC2R 0AP
