We are seeking a Principal Control, Command, Signalling, and Communications (CCSandC) Engineer to provide expert guidance on RSSB''s CCSandC standards and signalling projects, with expertise in either conventional signalling or digital signalling. This integral role involves leading the development of system compatibility requirements, ensuring safe integration, and managing operational technology including hardware, firmware, software, and data for signalling, train control, traffic management, SCADA, and remote monitoring systems. This is a permanent, full-time role based at our Fenchurch Avenue office and includes some hybrid working. The closing date for this role is 12th January 2026. Early application is encouraged, and candidates may be contacted before the close date. RSSB reserves the right to close this advertisement early should suitable candidates be identified. What you''ll be doing: Provide technical leadership and expertise on rail systems engineering, predominately control, command, signalling and communications (CCSandC) Lead and contribute to research and innovation projects, standards development, and industry guidance on CCSandC topics, such as conventional signalling, digital signalling, cyber security, and interoperability Engage with a wide range of stakeholders, including rail operators, infrastructure managers, suppliers, regulators, and academia, to understand their needs and expectations, and to influence and promote best practice in (CCSandC) eng