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