Design Engineer Battery Energy Storage System; BESS

Design Engineer (m/w/d) Battery Energy Storage System (BESS)

INTEC Energy Solutions delivers best‑in‑class services in Engineering, Procurement, Construction (EPC), Battery Energy Storage Systems (BESS), Project Development, Consultancy, and Operation & Maintenance, along with New Energy Solutions. With a globally experienced team, INTEC has managed over 190 projects and achieved an impressive installed and secured capacity of 3.9 GW. Headquartered in the United Kingdom, INTEC also operates offices in Germany, Türkiye, Australia, New Zealand, Azerbaijan, Romania, Mauritius, and Philippines with plans for further expansion.

You have deep expertise in BESS design and want to take your career to the next level?

Your chance to actively shape the energy transition! We are looking for a Design Engineer BESS from the European Economic Area (EEA) starting as soon as possible.

• Electrical planning and system design of Battery Energy Storage Systems (BESS) in the utility‑scale segment
• Creation of single‑line diagrams (SLD), protection concepts, and electrical system layouts
• Design and dimensioning of battery modules, inverter systems (PCS), transformers, cabling, and medium‑voltage connections
• Selection and technical specification of relevant BESS components (e.g. battery containers, HVAC, BMS, EMS, protection systems)
• Development of technical documentation, including wiring diagrams, cable schedules, interface documentation, bills of materials (BoM), and design reports
• Technical coordination with project management, procurement, suppliers, and grid operators
• Ensuring compliance with applicable standards and regulations (e.g. VDE-AR-N 4110/4120, IEC 62933, IEC 61439, VDE 0100)
• Support in system optimisation through evaluation of operational data and simulations

• Degree in Electrical Engineering, Energy Engineering, or a comparable qualification
• Several years of professional experience in the design and engineering of BESS systems, ideally in the utility‑scale sector
• In‑depth knowledge of BESS component integration (batteries, PCS, transformer, protection systems, BMS/EMS, grid interface)
• Proficient in relevant tools such as:
• AutoCAD / EPLAN (for electrical schematics and layouts)
• ETAP, DIgSILENT Power Factory (for grid calculations and protection concepts)
• Excel (for technical analysis and BoM creation), optionally Python for automating calculations
• Experience with grid connection projects, common EPC processes, and interface coordination
• Knowledge of medium‑voltage technology, protection systems, and compliant design of electrical systems
• Business fluent in English, both written and spoken
• Independent, structured, and solution‑oriented working style

• A dynamic company in the rapidly growing renewable energy sector
• Exciting and challenging large‑scale projects in the PV and BESS space
• An international, motivated team with flat hierarchies
• Flexible working hours and remote work options
• Attractive compensation with performance‑based bonus models
• Opportunities for professional development and career growth in a future‑oriented market
• Company pension scheme and capital‑forming benefits
• Hansefit membership with access to numerous fitness, sports, and wellness facilities across Germany
• Modern IT equipment and tools
• Ready to shape the future of the energy transition with us? Apply today – we look forward to getting to know you!

Oldenburg, Lower Saxony, Germany

Associate

Full‑time

Design and Engineering