Senior Mechanical Design Engineer

Do you want to work with the 15th fastest-growing startup in Europe? If so, you’re in the right place.

AssetCool is one of Europe’s fastest-growing startups, building the fastest path to more power on the grid.

We’re tackling one of the most urgent challenges in the global energy transition: grid congestion. Electricity demand is rising fast; driven by electrification, AI and data centres. While traditional grid upgrades take years, demand exists today. The grid isn’t ready.

AssetCool delivers robotic grid upgrades that physically increase the capacity of existing transmission lines by up to 30%, without rebuilding infrastructure. Using advanced robotics and proprietary photonic coatings, we unlock data-centre-scale capacity in weeks to months, not years and at a fraction of the cost and disruption of conventional approaches.

Our technology goes beyond capacity. We reduce losses, prevent corrosion, cut corona noise and generate high-value operational data that supports smarter grid operation and maintenance. Our systems are already deployed globally, and we just raised a big funding round from leading energy and climate investors.

AssetCool is one of the most innovation-driven companies in the UK energy sector and we’re scaling fast! If you’re ambitious, mission-driven and excited to work on real deployments that strengthen the industry that really matters, AssetCool is where you can make it happen.

This is a senior technical role within AssetCool’s robotics engineering team, leading the mechanical design of systems that operate directly on live high-voltage transmission lines.

You will take ownership of mechanical architecture from concept through to field deployment and production, working closely with electronics, embedded software, materials and high-voltage engineering teams.

This is a hands‑on role suited to an engineer who enjoys solving real‑world mechanical challenges in complex outdoor environments.

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• Lead the design of conductor‑traversing robots and drone‑deployed payloads
  
• Develop mechanisms capable of navigating transmission line hardware and harsh outdoor environments
  
• Drive system design from concept through prototype, field testing and production
  

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• Ensure mechanically robust designs suitable for operation in high electric‑field environments
  
• Support safe integration of mechanical, electrical and low‑voltage subsystems
  

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• Lead materials selection and structural design for durability, environmental exposure and fatigue
  
• Perform FEA, tolerance analysis and define validation strategies
  
• Analyse field feedback and drive design improvements
  

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• Apply DFM/DFA principles and support transition from prototype to production
  
• Work with suppliers and manufacturing partners to optimise fabrication and assembly
  

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• Work closely with electronics, embedded, coatings and field teams
  
• Contribute to system design reviews, risk assessments and mentoring of junior engineers
  

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• BEng / MEng in Mechanical Engineering or related discipline.
  
• 7+ years professional experience in mechanical design of complex systems.
  
• Ownership of products deployed in harsh or outdoor environments.
  
• Strong CAD proficiency (SolidWorks, Fusion 360, or equivalent).
  
• Experience with:
  
• Precision mechanisms
  
• Gear systems and motor integration
  
• Structural analysis (FEA)
  
• Strong understanding of:
  
• Tolerance stack‑up
  
• Fatigue and durability
  
• Environmental sealing
  
• Experience designing for vibration and shock.
  
• Hands‑on prototype development and debugging experience.
  
• Ability to make pragmatic engineering trade‑offs in fast‑moving environments.
  

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• Experience in robotics, aerospace, automotive or industrial systems
  
• Experience designing for high‑voltage or electrically sensitive environments
  
• Knowledge of composite materials and galvanic isolation
  
• Experience with IP‑rated enclosure design
  
• Experience working with overseas manufacturing partners
  
• Experience integrating payloads with drones
  

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• Work on groundbreaking technology revolutionizing the power grid.
  
• Fast‑growing startup with significant industry traction and large‑scale projects.
  
• Collaborative, innovation‑driven team with exciting career growth opportunities.
  
• Competitive salary, and flexible work options
  

Research shows that some candidates may hesitate to apply unless they meet every listed requirement. If this role excites you but your experience doesn’t align perfectly with every qualification, we still encourage you to apply. You might be exactly who we’re looking for, either for this role or another opportunity within our team.

We’re proud to be an equal opportunities employer and welcome applications from people of all backgrounds. We’re committed to building an inclusive, supportive workplace where everyone can thrive, regardless of age, disability, gender identity, marital or civil partnership status, pregnancy or maternity, race, religion or belief, sex, or sexual orientation.

If you have a disability or any specific requirements and need adjustments at any stage of the recruitment process, just let us know and we’ll do our best to accommodate your needs.

We may close this vacancy early if we receive a high volume of applications. We encourage you to apply as soon as possible to avoid missing out.

We are not looking for agency support currently.