Join AQUABATTERY today, a pioneering climate tech startup with a mission to commercialise a affordable, safe and sustainable long duration energy storage (LDES) based on saltwater. Our innovative flow battery technology offers an LDES solution without relying on critical or toxic raw materials.

With fresh funding secured and our first commercial product on the horizon, this is an exciting time to become part of our growing team and contribute to building a cleaner, more resilient energy future.

As the Lead Engineer Stack, you bring specific hands-on experience in stack development to AQUABATTERY and translate it into manufacturing-ready outcomes. You own the technical roadmap for the membrane stack, create focus on concrete deliverables, and connect stack development to internal requirements. Your value lies in generating technical drawings of the membrane stacks and battery system, knowing what has already been solved in industry, finding the right manufacturing partners and components within our cost constraints, and giving the team the structure and direction it needs to deliver.

• Define and maintain the technical roadmap for the stack track across all projects, translating requirements into concrete, deliverable-focused milestones
• Identify and qualify manufacturing partners and suppliers capable of delivering stack components, including multi-polymer systems and complex assemblies, within defined budget and cost targets
• Develop and manage supply chain relationships for stack components, prioritising manufacturing-ready solutions over custom development
• Create system-level CAD drawings from concepts and requirements, including P&ID, 3D models, and production-ready blueprints, at component, stack, and full system level
• Translate technical outcomes and R&D progress into specific, buildable deliverables that meet project requirements
• Distribute activities across projects to ensure milestones are achieved within delivery time, budget, and quality requirements
• Maintain comprehensive progress tracking and ensure visibility of the track’s status to internal stakeholders
• Proactively identify and raise technical risks before they impact project delivery
• Ensure technical documentation, design files, and test records are maintained to a high standard

• Proven experience in development of multi-layer product assemblies
• Supply chain experience: identifying, qualifying, and managing manufacturing partners for complex precision components
• Proficiency in system-level CAD: P&ID, 3D modelling, and production-ready documentation, from early concept through to manufacturing blueprint
• Experience in water processing, water treatment, or adjacent fluid-handling industries
• Ability to translate complex technical and manufacturing constraints into a structured, prioritised roadmap
• Proven track record of creating team focus and connecting technical outputs to specific, deliverable outcomes
• Experience working in a milestone-driven R&D or product development environment
• Strong documentation and technical communication skills
• Experience in energy storage, electrochemistry, or membrane technology is a strong advantage

• The opportunity to provide vital support to the energy transition at our state-of-the-art ETCA facility
• A collaborative, multicultural work environment where practical observations and technical insights are valued
• A structured, performance-driven culture that supports professional growth and technical skill development
• Competitive salary plus Stock Appreciation Rights (SARs)
• Work-life balance, including 25 vacation days and flexible working arrangements
• Green pension scheme (50% employer contribution) and collective health insurance discount
• Company bike for commuting
• Regular team events and opportunities to shape the future of clean energy