Electronics / Firmware Engineer

Contract Senior Electronics / Firmware Engineer – Sensor Expertise Rate: £400–£425 per day + VAT IR35 Status: Outside IR35 Location: Greater London (3-4 days on site per week min)Contract Length: 3–6 months, with potential extension We’re working with an innovative technology business at the forefront of advanced sensing solutions, seeking a Senior Electronics / Firmware Engineer to support the development of next-generation products. This is an opportunity to join a highly collaborative, multidisciplinary team delivering cutting-edge solutions with real-world impact. In this role, you’ll take ownership of sensor characterisation and optimisation, with a particular focus on humidity and temperature sensing technologies. You’ll play a key part in refining performance, reliability, and integration within sophisticated systems, contributing directly to product development from concept through to validation. This is a hands-on engineering role suited to someone who enjoys solving complex technical challenges and working closely with hardware, software, and mechanical engineers in a fast-paced R&D environment.Key Responsibilities

• Characterise, test, and optimise sensor performance, particularly metal oxide and electrochemical sensors
• Design, develop, and iterate electronic circuits and PCB layouts
• Support firmware development for hardware interfacing and system integration
• Collaborate cross-functionally to ensure seamless integration across electronics, firmware, and mechanical components
• Contribute to prototyping, validation, and performance tuning of advanced sensing systems

Core Skills & Experience

• Strong background in electronic engineering, including PCB design and development
• Experience working with electrochemical or metal oxide sensors
• Solid embedded firmware capability (not necessarily specialist level), including:
• Hardware interfacing
• Communication protocols (e.g. LoRaWAN or similar)
• Proven experience taking products from development through to testing or deployment

Highly Desirable

• Experience working with volatile organic compounds (VOCs)
• Knowledge of air sampling systems or environmental sensing
• Background in healthcare, life sciences, or medical device development

Why Apply?

• Work on cutting-edge sensing technologies with meaningful real-world applications
• Join a highly skilled, multidisciplinary team in a collaborative environment
• Opportunity to make a tangible impact on product performance and innovation
• Flexible working arrangements and a strong likelihood of contract extension