I’m supporting a key client based at their HQ in Sedgefield — a high-growth RF/microwave technology business delivering advanced connectivity solutions into space, defence, telecoms and critical communications sectors. They design and manufacture high-performance RF, microwave and mmWave hardware for mission-critical systems, and they’re scaling quickly following strong revenue growth and multiple flagship programme wins. They’re now looking to add a Senior RF Engineer to strengthen their core RF/mmWave capability at the Sedgefield HQ. This Senior RF Engineer will take a leading role in designing, developing and validating high-performance RF/mmWave circuits and subsystems, collaborating closely across engineering teams and playing a key part in delivering complex new products. Role Overview – Senior RF Engineer You’ll be responsible for robust RF/microwave design delivery, hands-on test work, technical problem-solving, and supporting the wider engineering roadmap across concept, prototype and production. Key Responsibilities Technical Lead the design, simulation and development of RF and mmWave circuits, components and subsystems Perform RF system analysis, optimisation and troubleshooting on complex designs Execute RF measurements, characterisation and validation across prototypes and production hardware Produce high-quality technical documentation including design reports, test plans and results Ensure designs meet specification, standards and customer requirements Contribute to product and technology roadmaps with innovative RF ideas Provide technical input into RFQs, proposals and customer discussions when required Project and product delivery Work with project managers and engineering leads to deliver designs to quality, cost and schedule Support the transition of concepts through prototyping into volume manufacturing Collaborate with operations/process engineering to ensure strong manufacturability and yield Assist in identifying and mitigating technical risks throughout development Collaboration & Communication Work closely with electronics, mechanical, software and systems engineering teams Provide technical support to internal stakeholders and customers Present technical updates and design reviews as required Scope may evolve as programmes and customer needs develop.