Senior Baseband Engineer (ATEX)

Sepura plc.; Cambridge; On-site; GBP 55,000 - GBP 75,000; Full time

Job summary

A leading technology company based in Waterbeach, Cambridge, is seeking a Senior Hardware Engineer with proven ATEX product design experience. You will play a key role in developing mission-critical communication products. Responsibilities include designing intrinsic safety circuitry, developing microprocessor systems, and conducting comprehensive testing. Ideal candidates should possess a relevant degree, experience in ATEX environments, and strong technical documentation skills. This role offers an opportunity for growth within an innovative team.

Qualifications

• Bachelor’s degree or equivalent experience in relevant engineering discipline.
• Experience developing products for ATEX-certified environments.
• Strong written communication skills for technical documentation.

Responsibilities

• Design intrinsic safety (IS) circuitry for ATEX-certified products.
• Develop advanced microprocessor-based systems with various sensors.
• Conduct design verification and system-level testing.

Skills

Intrinsic safety design

Microprocessor system design

Technical documentation

Low-power architectures

Serial communication interfaces

Education

Bachelor’s degree in Engineering

Job description

Overview

We are on the lookout for a Senior Hardware Engineer with proven ATEX product design experience to play a key role within the Baseband Hardware Team, as we develop our next generation of mission-critical communication products. The Baseband team is involved in the whole product lifecycle from initial specification of critical subsystems, through detailed design and testing of the finished product. Join Sepura Ltd at an exciting time of growth and progress your career within this innovative technology company, based in Waterbeach, Cambridge.

Role

The role requires a self-motivated individual who likes contributing to a team. We require someone who can adapt to changing requirements and effectively communicate their progress with both design and verification of the platform. As a senior engineer, you will take responsibility for delivering small product features or significant parts of larger features. You will contribute to the design and development of TETRA/Broadband radio equipment, accessories, tools and services provided to customers.

Day to Day

Our customer base includes many different industries and markets around the world. Our complete TETRA and LTE solutions have been developed specifically for users in multiple sectors to face their critical communications challenges. There is no such thing as a typical day here at Sepura. You will be supported by your manager and team, as well as collaborating with other departments across the business.

Baseband Hardware activities

• Designing intrinsic safety (IS) circuitry for ATEX‑certified products, including identifying infallible connection requirements, applying current‑limiting techniques for DC‑DC converters, and ensuring compliance with temperature‑classification and encapsulation standards. You’ll also diagnose non‑conformances and implement thermal‑management solutions such as heat‑sinking.
• Developing advanced microprocessor‑based systems, integrating a wide range of sensors such as accelerometers, magnetometers, proximity detectors, gyroscopes, and barometers to support mission‑critical functionality.
• Designing high‑efficiency, low‑power power‑supply architectures, ensuring robust performance across challenging operational environments.
• Creating and validating audio amplifier designs up to 10 W, optimising for clarity, efficiency, and reliability.
• Conducting design verification and system‑level testing, including EMC validation, to ensure compliance with internal standards and external regulatory requirements.
• Producing high‑quality engineering documentation, including functional specifications, detailed design descriptions, and supporting artefacts for modules and complete product assemblies.

Qualifications

• A bachelor’s degree in a relevant engineering discipline, or equivalent industry experience demonstrating strong technical capability.
• Proven experience developing products for ATEX‑certified environments, with a solid understanding of intrinsic safety principles and compliance pathways.
• Strong written communication skills, with the ability to produce clear, accurate, and structured technical documentation.
• Expertise in microprocessor system design, including power‑supply requirements, low‑power architectures, and power‑saving strategies.
• Proficiency with key serial communication interfaces, including I²S, I²C, UART, and USB (with USB 3.0 experience considered especially valuable).

Nice to have

• Demonstrated success in designing for EMC and ESD robustness, from component selection through to system‑level mitigation.
• Experience integrating baseband and RF functional blocks, ensuring reliable performance across complex mixed‑signal architectures.
• Background in audio system design, particularly with low‑power audio amplifiers up to 10 W.
• Familiarity with embedded Linux environments, including driver integration, board bring‑up, or system‑level debugging.