Senior Test Development Engineer

About Plessey

We’re building the hardware foundation for next-era computing.

Plessey is a world-leading technology company driving the next generation of photonic devices and systems. With over 70 years of innovation, we combine research, materials science, process engineering, and manufacturing under one roof. We’re recognised as a global authority in microLED displays, optical computing, and optical interconnects.

Join us to work on breakthrough technologies shaping the future of light-based technology and computing.

You can get further details about the nature of this opening, and what is expected from applicants, by reading the below.

Lead

We don’t follow industry trends; we create them, pushing boundaries and setting standards others aspire to. Every team member has the power to make decisions, drive change, and deliver excellence. We support each other, challenge one another for the best solutions, and lead by example. Together, we build industries and technologies that shape the future and scale toward our vision of the next era of computing.

Grow

We expand our capabilities every day — deepening our expertise, improving how we work, and pushing the boundaries of what’s possible. Curiosity fuels us: we question assumptions, explore new ideas, and innovate with light-based technologies. By investing in and empowering our people, we strengthen Plessey’s impact and help shape the future of optical technology.

Trust

We operate like a family—honest, reliable, and supportive. We have each other’s backs, own our actions, and uphold the highest standards of integrity and safety. We trust each other to deliver, our customers to challenge us, and our expertise to guide the way. Together, trust enables the collaboration essential for breakthrough innovation and lasting impact.

Location

Located at our head office and state-of-the-art fabrication facility in Plymouth.

About the Role

We are looking for an experienced Test Development Engineer to join our team. In this role, you will work with advanced test equipment, helping to develop and improve innovative testing solutions. If you are passionate about test development, enjoy solving complex problems, and want to work with cutting-edge technology, we would love to hear from you.

Key Responsibilities

• Implement and maintain digital and mixed-signal test solutions.
• Specify hardware required for testing such as probecards, interface boards etc.
• Develop and optimise test programs for complex devices using Teradyne Ultraflex.
• Perform test program, Test HW characterization over temperature (Ex. Shmoo analysis), GRR, Correlation, setup calibration and product qualification.
• Drive and perform the Repeatability and Reproducibility Studies which are necessary to transfer a test solution from an in-house development site or from other development sites to a full manufacturing high volume setup.
• Define and release procedures for all aspects of test program development (e.g. test program release, test coding guidelines etc).
• Release and support test programs for production.
• Collaborate with key stakeholders to ensure on time delivery test coverage and quality.
• Work with stakeholders to identify and implement test process improvements.

Skills, Knowledge and Expertise

• Significant experience in test development within mixed-signal environments, encompassing both analog and digital system validation.
• Strong programming skills ( VBA, Python).
• Understanding of digital and analog test principles.
• Problem-solving and analytical skills.
• Experience with GRR and test program release processes including data analysis software (eg. JMP, Examinator).

Advantage

• Mixed-signal testing expertises.
• Experience with Teradyne Ultraflex.
• uLED and /or display panel testing expertise.
• Knowledge of Teradyne IRIS100S systems.
• Knowledge of semiconductor manufacturing and test flows. xwzovoh
• Knowledge of TEL probers.
• Expertise with test program control such as git.