Senior Security Engineer

This a Full Remote job, the offer is available from: Europe, Asia Nansen surfaces the signal and creates winners in the future of finance. We're building a new way to trade: agentic, onchain, and fully integrated. From analytics to execution, we're the platform where investors find alpha and act on it. The Opportunity As we scale our product, staking operations, and AI-powered capabilities, security matters more than ever. We're hiring a Senior Security Engineer to strengthen our security posture across the entire engineering organisation. You'll work closely with the Head of Security and collaborate hands-on with engineering teams across the company to ensure that the systems we build are secure by design. This is a generalist security role. You'll operate across application security, cloud infrastructure security, and organizational security practices. It's ideal for someone who thrives in a high-autonomy environment, is comfortable spanning multiple security domains, and wants to have outsized impact at a growing company. What You'll Do • Conduct security reviews of systems, architectures, and code — proactively identifying and addressing vulnerabilities. • Serve as a go-to security advisor for engineering teams, helping them make secure design decisions. • Define and implement security standards across cloud infrastructure, applications, and blockchain systems. • Implement and maintain security tooling: vulnerability scanning, endpoint protection, SIEM, logging and monitoring. • Secure CI/CD pipelines and deployment workflows from a security perspective. • Secure internal AI tools and LLM integrations — from API key management and prompt injection prevention to evaluating the security implications of AI adoption across the organization. • Manage and improve secrets management, key management, and access control practices across the organization. • Define and maintain secure coding guidelines and security review processes for engineering teams. • Collaborate with external providers on penetration tests and security audits, ensuring findings are prioritized and remediated. • Participate in incident response: investigation, containment, root cause analysis, and post-incident improvements. • Support compliance and audit readiness by implementing required security controls and maintaining documentation. What We're Looking For • Strong understanding of cloud security (AWS, GCP, or similar), container security, and network security fundamentals. • Hands-on experience implementing and operating security tools (SIEM, vulnerability scanners, endpoint protection, cloud security tooling). • Experience with secrets management, key management, and encryption best practices. • Experience securing AI/LLM tooling, agent-based systems, and modern developer platforms. • Familiarity with securing CI/CD pipelines and developer tooling. • Solid understanding of compliance frameworks (SOC 2, ISO 27001, or similar). • Proficiency with AI-powered tools in day-to-day work, with a drive to find the best balance between productivity and security. • Clear written and verbal communication skills, suited for a remote-first, async environment. • A pragmatic, hands-on mindset — comfortable working across security domains rather than specializing narrowly. Nice to Have • Experience securing blockchain systems, smart contracts, or staking infrastructure. • Experience with Kubernetes and infrastructure-as-code security (Terraform). • Background in incident response or security operations. • Interest in or experience with the crypto/Web3 space. How We Work • We're remote-first, with async communication as the default and purposeful use of video calls. • We work across time zones, with EMEA working hours preferred for this role to overlap with the Head of Security and core engineering teams. • We use Slack and structured documentation to keep everyone aligned and empowered. • You'll join a high-autonomy team where engineers are trusted to take initiative, propose ideas, and ship great work. This offer from "Nansen" has been enriched by Jobgether.com and got a 78% flex score.