Job Description ALTEN UK is seeking a motivated Control & Instrumentation (C&I) - Design Engineer to join our growing team in Derby | Manchester | Warrington, supporting key projects within the Energy sector. This is an exciting opportunity for engineers looking to develop deep technical expertise across the full lifecycle of control and instrumentation systems. In this role, you will lead the development of C&I functional specifications across the nuclear plant, translating high-level plant requirements into structured, implementable system designs. You will play a key role in defining how plant systems behave, interact, and respond under various operating conditions. Working at the heart of a multidisciplinary engineering environment, you will collaborate closely with system architects, plant designers, and simulation teams to ensure robust, aligned, and high-quality solutions. This is an excellent opportunity for experienced engineers who want to take ownership of complex design packages and contribute to a first-of-a-kind nuclear programme. Key Responsibilities: Lead the development of functional design specifications for C&I systems across the SMR plant Translate plant-level requirements into clear, structured system functions and behaviours Collaborate with multidisciplinary teams including: C&I architects and system owners Plant system and capability teams Modelling and simulation engineers Support technical decision-making and ensure alignment across engineering disciplines Deliver work packages to time, cost, and quality expectations Contribute to system design strategies including resilience, redundancy, and fault tolerance Support verification, validation, commissioning, and lifecycle activities Mentor and guide junior engineers within the team