Product - Applications Engineer

Nabla; Diemen; On-site; EUR 60,000 - 90,000; Full time

Job summary

Moonwatt is expanding its engineering team to bring battery energy storage systems from design to mass production. The Applications Engineer will design, validate and qualify hardware and systems, bridging product development and customer applications.

You will work with seasoned engineers and grow scope over time, owning outcomes in a small team. Key responsibilities include validating BMS electronics, wiring harnesses and DC-DC converters, and leading compliance work with UL/IEC standards.

Qualifications

• Strong electrical engineering background.
• 3–5 years of experience in power systems and project/product design, with growing autonomy.
• Higher seniority welcomed; scope can include supplier relationship management.
• Hands-on experience with electrical component selection, testing and qualification.
• Exposure to compliance and certification processes (UL/IEC) is a strong plus.
• Fluent in English; other languages are a plus.

Responsibilities

• Design, validate and qualify hardware and systems for battery energy storage.
• Bridge hardware, firmware and software teams on system capabilities and trade-offs.
• Own systems engineering calculations for usable energy, operating windows and power limits.
• Act as technical interface between Sales and R&D to translate customer requirements into engineering specs.
• Support field validation, pilot deployments and customer discussions.

Skills

Electrical engineering

Power systems

Technical design

Technical communication

Job description

About the role

Moonwatt designs and builds battery energy storage systems. We're growing our engineering team to support certification and production of our next generation of products, and the Applications Engineer will play a central role in designing, validating, documenting, and qualifying our hardware and systems as we bring them to market, bridging product development and customer applications. You will work directly with seasoned engineers and will grow scope and ownership over time. This is an unique opportunity to bring battery system from desgin to mass production in a team small enough that you own the outcomes.

What you'll do

Hardware, Validation & Compliance

• Dimension, source, test and qualify components for BMS electronics, power electronics, and electrical systems (connectors, fuses, contactors, breakers, cables).
• Design and validate wiring harnesses and enclosures, and evaluate and integrate equipment such as DC-DC converters and inverters.
• Lead compliance research related to UL, IEC and other applicable standards.

Applications, Systems Engineering & Product Validation

• Research compliance requirements and safety functions, and write functional requirements for BMS and site controller applications.
• Test and validate system functionality in the field and on prototypes.
• Bridge hardware, firmware, and software teams on system capabilities, limitations, and trade-offs.
• Own systems engineering calculations for usable energy, operating windows, and power limitations across cell technologies and power conversion architectures.

Customer Applications & Deployments

• Act as the technical interface between Sales and R&D, translating customer requirements into engineering requirements.
• Support technical discussions with customers, grid operators, and partners.
• Own smaller pilot projects, custom deployments, and field validation activities.

As our deployment footprint grows, this role will also link R&D and Service Engineering, feeding field issues back into product improvement.

• Strong electrical engineering background.
• 3–5 years of experience in power systems and project/product design, ready to own individual work streams (e.g., component testing, harness design, functional requirements) with growing autonomy.
• Higher seniority is also welcome, the scope will be shaped around what you can own. For example, managing a key power-conversion supplier relationship from selection, procurement through integration and testing.
• Hands‑on experience with electrical component selection, testing, and qualification (power electronics, BMS, or similar systems).
• Exposure to compliance and certification processes (UL or IEC) is a strong plus.
• Comfort working across hardware, firmware, and software boundaries, and translating between technical and customer‑facing conversations.
• Travels to support new product builds, support field validation, pilot deployments, and occasional customer‑facing meetings. Travel 30% of time.
• Fluent in English, other languages a plus

• Be part of a fast-growing startup delivering next‑generation clean energy technology.
• Work on high-impact projects alongside experienced engineers across the EU.
• Competitive salary, benefits, and opportunities for growth in the energy tech sector.

WE PARTICULARLY ENCOURAGE WOMEN AND INDIVIDUALS FROM UNDERREPRESENTED BACKGROUNDS TO APPLY EVEN IF YOU DON'T MEET 100% OF THE LISTED QUALIFICATIONS. POTENTIAL AND MOTIVATION MATTERS AS MUCH AS EXPERIENCE.