Senior System Test Engineer

Yoh, A Day & Zimmermann Company; Southampton; On-site; GBP 55,000 - 73,000; Full time

Job summary

Yoh, A Day & Zimmermann Company in Southampton seeks a test engineer who thrives on solving wireless system problems. You will work where RF, software and 5G meet, performing hands-on testing, debugging and validating end-to-end systems.

You'll own test strategies, build Python automation, and translate customer requirements into practical test plans, with exposure to 4G/5G PHY/MAC layers and system integration. This role suits engineers who enjoy taking ownership and learning new things.

Qualifications

• Experience in wireless communications and RF systems.
• Hands-on debugging of complex RF/software interactions.
• Proficiency in Python for test automation.
• Experience with system integration and validation workflows.
• Knowledge of 4G/5G PHY or MAC layer technologies.

Responsibilities

• Develop and execute test strategies for wireless systems.
• Build and maintain Python-based test automation for validation tasks.
• Troubleshoot and debug cross-domain RF, software and hardware issues.
• Translate customer requirements into practical test plans and procedures.

Skills

Wireless communications

RF test

Python automation

System integration

4G/5G PHY/MAC

Job description

Most test engineering roles involve executing someone else's plan.

This one doesn't.

The challenge here is figuring out how complex wireless systems behave when the real world gets involved.

The work sits where RF, software, digital systems and 5G communications meet. One day you could be investigating a PHY layer issue, the next building Python automation, debugging a system-level problem or helping translate customer requirements into a test strategy.

This isn't a role for someone who wants to follow a script.

It's for an engineer who enjoys understanding how things work.

What makes it interesting?

• Advanced 5G and NTN technology
• Difficult technical problems that don't always have obvious answers
• Exposure across RF, software, systems and validation
• Customer-facing projects with real-world impact
• A small engineering team where people are trusted to make things happen

You'll probably have experience in some combination of:

• Wireless communications
• RF engineering or RF test
• Python development and automation
• System integration and validation
• 4G/5G, PHY or MAC layer technologies
• Troubleshooting complex technical issues

Most importantly, you'll be the type of engineer who enjoys solving problems, learning new things and taking ownership.

If you've spent your career close to wireless systems and still enjoy getting hands-on with technology, we'd like to hear from you.