ETL Systems Ltd ETL Systems has been at the forefront of RF design and manufacturing for over 35 years. It designs and builds essential elements of critical satellite communications infrastructure. Its culture of innovation and solution-oriented approach has established it as a market leader in the field, with revenue growing 30x since 2003. In 2020, ETL Systems received significant investment from CBPE Capital, enabling the management team to drive its ambitious growth plan forward. ETL's rapid growth and success have been recognised at the UK's highest level, winning three Queen's Awards for Enterprise in International Trade. As a testament to that success, the top 20 satellite operators and teleports utilise ETL's products. Around the world, 75% of NATO governments use ETL Systems equipment to protect their citizens. Today, the company offers a full suite of solutions between the antenna and the modem for both the uplink and downlink chains. ETL recently acquired Spacepath Communications to integrate SpacePath's HPA product line into its portfolio. This position positions ETL to meet the evolving needs of our customers better and expand ETL's reach within the SATCOM market. ETL People benefits 25 days' holidays plus UK bank holidays Buy and sell holiday scheme Long service holiday accrual Enhanced pension plan Life assurance Annual salary review Career development and training for all roles Free employee refreshments Casual business dress Annual company events Employee kudos awards ETL employee wellbeing support (free annual flu vaccination, free eye tests, free employee assistance programme, Free GP Access) Employee referral bonus Free onsite parking EV charging is available on-site Cycle to work scheme Green travel scheme Role Overview We are looking for a highly experienced Principal RF Engineer to join our advanced Research & Development team in Rickmansworth, North London. This is a critical role within ETL Systems, where you will lead the design, development, and implementation of complex RF and mmWave systems that underpin next-generation satellite communication technologies. Operating at the forefront of innovation, you will be instrumental in delivering high-performance RF sub-systems from initial concept through to production, ensuring that our solutions meet the rigorous demands of global connectivity. As a Principal RF Engineer, you will work onsite in our state-of-the-art R&D Lab, collaborating closely with a dynamic team of RF specialists and multidisciplinary engineers. This hands-on environment offers the opportunity to engage in practical design, rapid prototyping, and precision testing using world-class equipment. This position is ideal for an engineer who thrives on technical challenges, values innovation, and enjoys mentoring others. You will report directly to the RF Team Lead and play a key role in shaping the future of RF technology within our organisation. Key Accountabilities Lead the design and development of RF and Microwave products across IF, L-, C-, X-, Ku-, K-, Ka, and Q/V-Bands. Solve complex and unique RF design challenges with broad business impact. Anticipate internal and external business and regulatory challenges to improve products, processes, and services. Lead cross-functional project teams to achieve technical milestones and strategic objectives. Perform RF system analysis and simulation, including cascade analysis and frequency planning. Produce high-quality technical documentation including datasheets, design reports, and test results. Communicate complex technical ideas and influence senior stakeholders to adopt new approaches. Mentor junior engineers and contribute to the development of functional strategy. Collaborate with internal stakeholders to ensure timely delivery and alignment with business goals. Our ideal candidate: Our ideal candidate will be a hands-on professional who will spend most of their time in the lab developing new technologies and supporting the next generation of up-and-coming RF professionals. Essential Extensive experience in RF and Microwave design (DC–6GHz and ideally up to >40GHz). Proven ability to solve complex engineering problems with strategic impact. Proficient in CAD tools (e.g. NI/AWR Microwave Office). In-depth understanding of RF circuit theory, transmission lines, and PCB layout. Experience designing amplifiers, splitters, switches, converters, and passive networks. Skilled in using RF test equipment (e.g. VNAs, spectrum analysers). Strong communication and leadership skills, including influencing senior stakeholders. Desirable Experience with satellite communications and compliance standards (e.g. EMC). Familiarity with system simulation tools and RF product assembly techniques. Knowledge of interfacing RF with digital and analogue electronics (e.g. FPGA, ADC/DAC). Experience in Design for Manufacture and Design for Test. Location: This role will be site-based and located at our offices in Rickmansworth. Closing date: 08/01/2026 At ETL, we always prioritise efficiency in everything we do. With this in mind, we are looking to commence our interview process without delay and reserve the right to close the opening early should we receive suitable applications. BPSS Compliant: Due to the nature of our work, many of our roles require all candidates to be BPSS compliant. VISA Sponsorship: E TL Systems is proud to be a Grade A VISA sponsor for skills in short supply within the UK - we are open to receiving applications from Q&V Band Specialists looking to relocate to the UK.