Celstor GmbH | Germany | 40xxx Düsseldorf | Permanent position | Full time | Published since: 10.02.2026 on stepstone.de
CTO in the field of large-scale battery storage systems (m/f/d)
Celstor GmbH is a young, dynamically growing company in the field of large-scale battery storage solutions (BESS and photovoltaics), which play a key role in the energy transition and future network stability. We think energy new – entrepreneurial, technology-driven and with a clear focus on economy and scalability. Guided by the two founders and shareholders Sven Wendt and Eugen Eichmann, we are now looking for a strong operational management personality as Chief Technology Officer (CTO, m/w/d), which takes over the link between the management and the EPC daily business. .
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Your tasks • Your profile • What we offer
Technology: Planning, construction and technical development of the PV and BESS projects from pre-planning to transfer to operation
Roadmap & Standards: Technology Roadmap, Reference Designs, Technical Standards, Testing and Acceptance (FAT/SAT/IBN)
project management TKQ: time, cost and quality responsibility for all technical workstreams; Ampel reports, Riskboard, Escalation routine
Suppliers & Contracts: Selection/qualification of battery/PCS/Trafo/EMS, framework contracts, SLA and warranty; Claim and Deficiencies Management
Network & Rules: Ensuring grid compliance (e.g. VDE-AR-N 4110/4120), technical evidence, coordination of network applications with engineering
Team Building & Leadership: Construction and Leadership of Engineering, Construction/Inoperation and O&M Interface; Coaching, Skill profiles, Hiring
Interface Management: Close cooperation with COO, Purchasing, Finance/Reporting, Sales/Investors as well as network operators and authorities
Education/Studium: Complete studies in electrical engineering/energy engineering, mechanical engineering, industrial engineering (energy/electro) or equivalent
Industry: Multiannual leadership experience in the energy sector with detectable references in PV, BESS or comparable production/storage technologies
Technical depth: planning, construction, commissioning; Civil engineering/cable trays, protection/guide technology, transformer stations, EMS/PCS interfaces
Supply Chain Competence: Construction of International Supply Chains, Manufacturer Qualification, Framework Contracts/SLA, Quality Assurance, On-Time Delivery
Regulatory & Operator Practice: Safe in Grid Compliance and Technical Detections, confident in handling operator requirements
Control & Reporting: Detectable successes in standardization, serial rollout, KPI-based TKQ control and risk management
Languages & mobility: German safe, English very good; high readiness incl. Stay abroad
experience with ERP/DMS/BI and scheduling tools; Monitoring/IBN processes
Key role with direct impact on growth, quality and return of our projects. High design playroom, short decision-making paths, narrow wire to the founders. Attractive compensation package (Fixum + performance-related components) and a modern, dynamic environment
Location
 | Celstor GmbH | |
| 40212 Düsseldorf | ||
| Germany |
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