Benefits Yearly "work from anywhere" policy Sabbatical schemes at any of the company's international offices Company pension contribution up to 10% Industry leading benefits package The Company OXBO are delighted to be continuing their partnership with a leading international, end-to-end, Solar&BESS developer, owner and operator, and energy trader to add an experienced Senior BESS Engineer to their Engineering team in any of their London, or Dublin offices. As a company, they have a development portfolio that is one of the largest in the UK, and they have a large number of projects moving into construction. The Role The successful candidate will play a pivotal role in the technical assessment of designs, leading optimisation efforts, and supporting the expansion their Battery Energy Storage (BESS) portfolio. As a Senior BESS Engineer, you will collaborate closely with Project Engineers and Project Managers during the project delivery phase while providing critical engineering support to the Construction, Pre-Construction, and Development teams. Apply electrical and power systems expertise to identify and drive innovative solutions for large-scale utility projects. Provide BESS design input for conceptual design studies, feasibility studies, and technical due diligence assessments for co-located and standalone BESS projects. Review and evaluate single-line diagrams, communication wiring diagrams, BESS system layouts, and other electrical designs to ensure compliance with standards and project requirements. Prepare ERs related to contractor works for BESS projects and ensure their implementation through regular auditing. Promote standardised BESS designs to reduce CAPEX and OPEX while establishing sound engineering standards, systems, and procedures for the engineering department. Collaborate with vendors, manufacturers, and internal teams to specify BESS equipment and drive technical solutions. Prepare and maintain clear documentation, including design specifications, white papers, schematics, diagrams, and reports. Evaluate electrical calculations and designs, including battery system layouts, PCS integration, control and protection systems, power system studies, earthing, LV distribution, general service design, and EMS functionality. Support the Grid team in reviewing System Operator requirements and addressing utility application standards. Coordinate with Owner’s Engineer site engineers to address design-related issues during construction and commissioning. Requirements A Bachelor’s Degree in Engineering or equivalent experience. Ideally 5-10 years of relevant experience as an Electrical/Project Engineer, preferably in BESS, renewables, or related fields. Proficiency in BESS electrical installations, ampacity calculations, short circuit/load flow studies, protective device coordination, arc flash analysis, grounding per IEEE 80, and other relevant design topics. Strong expertise in specifying, evaluating, and procuring BESS equipment as well as major electrical components such as switchgear and transformers. Experience in developing electrical construction drawing sets and supporting construction administration tasks (RFIs, Design Change Notices, as-builts). Expertise in controls, networking, SCADA systems, and CAD tools. Familiarity with renewables, PV systems, EPC project delivery, generation system design, and microgrids.