Lead Security Engineer

Fuse Energy is a forward-thinking renewable energy startup on a mission to deliver a terawatt of renewable energy - fast. We're combining first-principles thinking with cutting-edge technology to build a radically better energy system. We raised $170M from top-tier investors including Multicoin, Balderton, Lakestar, Accel, Creandum, Lowercarbon, Ribbit, Box Group and strategic angels like Nico Rosberg, the Co-Founder of Solana and GPs behind Meta, Revolut, Spotify, Uber and more.

We’re creating a fully integrated energy company: from developing solar, wind and hydrogen projects to real-time power trading and distributed energy installations. By selling directly to consumers, we cut out the middleman, lower costs and pass on savings to customers.

But we’re not stopping there. We’re also building the Energy Network: a decentralised platform of smart devices that rewards users in Energy Dollars for electrifying their homes, shifting usage to off-peak hours, and helping balance the grid. This network strengthens grid stability - a critical foundation for scaling AI data centers and other energy-intensive industries.

We are looking for a seasoned and proactive Lead Security Engineer to help lead our security strategy. This role is crucial to protecting our core infrastructure, applications, and sensitive data as we continue to scale. The ideal candidate brings deep security expertise and thrives in fast-paced, product-focused environments. You will play a critical role in shaping secure architecture, implementing scalable protection mechanisms, and driving a security-first culture across the company.

Responsibilities

• Security Architecture & Design
• Design and implement secure infrastructure across cloud, web, and distributed application environments.
• Provide architectural guidance for cryptographic key management, signing workflows, and secure APIs.
• Evaluate and enhance security of components related to digital asset management, identity systems, or transaction flows.
• Risk Management & Threat Modelling
• Conduct comprehensive threat modelling and risk assessments, especially around distributed or high-value transaction systems.
• Define controls for securing sensitive operations such as wallet integrations, off-chain/on-chain data flows, and internal tooling.
• Develop and manage internal threat intelligence processes to proactively identify and mitigate emerging risks.
• Security Operations & Incident Response
• Lead response to advanced threats and incidents, including analysis, containment, and remediation.
• Build and optimise detection mechanisms and playbooks for novel attack vectors, including abuse prevention and fraud detection.
• Governance, Compliance & Best Practices
• Help define internal standards for security development practices, secrets management, and infrastructure hardening.
• Maintain compliance with relevant frameworks (e.g., SOC 2, ISO 27001, GDPR), and support any industry-specific due diligence.

• Cross-Functional Collaboration

• Partner with engineering, product, and infrastructure teams to embed security best practices into all stages of development.
• Provide guidance on secure system design, especially in areas involving sensitive financial, identity, or cryptographic components.