Senior/Staff Unity Engineer

We’re a team of experts pushing the limits of what’s possible, united by our common goal to unlock true freedom through digital ownership, making technology accessible for all. We believe in a world where users, creators and enterprises manage their value with ownership and freedom. Our curiosity drives us to innovate, empowering individuals on a global scale. We believe change is constant and our team moves forward as one, with a culture of problem-solving where every employee is empowered and supported to challenge tradition and create solutions. Our mission is simple: to make self-custody accessible and give people the keys to their own financial futures. If you want to make a true impact, we want you to join us at Ledger. At Ledger, we’re proud to be the global platform for digital assets and Web3, with over 20% of the world’s crypto assets secured through our Ledger devices. With our headquarters in Paris, and offices in Vierzon, Grenoble, Montpellier, London, Portland, Geneva, Zurich and Central Singapore, we have a team of around 600 professionals developing a variety of products and services to enable individuals and companies to securely buy, store, swap, grow and manage crypto assets – including the Ledger hardware wallets line with more than 7.5 millions units already sold in 200 countries. The team: You’ll join the Security Operations team, responsible for protecting Ledger’s corporate, cloud, SaaS, and data center environments. Its mission: to anticipate, detect, investigate, and respond to cyber threats—including monitoring, alert triage, incident response, detection, visibility, automation, exposure tracking, and continuous process improvement. The scope is distinct from that of the Donjon (product security): SecOps covers the operational security of internal environments, the cloud, endpoints, workloads, identities, and infrastructure. As a close-knit and experienced team—technically demanding and committed to knowledge sharing—we’re also continuously building the SOC itself: integrating new log sources, ensuring data quality, expanding detection coverage, and developing reliable dashboards and operational workflows. Our technical stack includes: * Splunk for SIEM, investigations, and dashboards; * CrowdStrike for EDR and endpoint/workload security; * Wiz for cloud security and exposure management; * Torq for SOAR and automation; * AWS, including modern environments such as EKS/Kubernetes; * An in-house developed Agentic SOC for alert enrichment, correlation, investigation support, reporting, and automation. AI is at the heart of how we work: investing in AI applied to security is a strategic priority for Ledger this year. We’ve built our own in-house Agentic SOC, which autonomously investigates weak signals—the large volume of unreliable alerts that a human team couldn’t sort through manually—and enriches them, so our engineers can focus on what matters most and resolve incidents faster: high-quality detection, noise reduction, and accelerated investigations. What you’ll be doing: As a Staff Security Operations Engineer, you are the SecOps team’s top technical expert and our go-to authority on incident management. You lead the response to the most critical and complex incidents (CSIRT), spearhead proactive threat hunting, and define the detection and response strategy that the entire team relies on. Beyond day-to-day operations, you shape the architecture of our detection pipeline, SIEM, and automation—including the management of our internal Agentic SOC—and you establish the standards, playbooks, and methodologies that raise the technical bar for the entire team. Above all, you’re a builder: beyond design, you’ll build and actively evolve our systems—the Agentic SOC, the log pipeline, and automation—with a solid understanding of the underlying infrastructure. This is an expert role (individual contributor): your impact stems from your expertise, your judgment under pressure, and your influence. Critical Incident Response (CSIRT) * Serve as the primary point of contact and coordinator for the most complex incidents across the cloud, corporate systems, endpoints, identities, and the data center. * Conduct end-to-end investigations: root cause analysis, forensics, timeline reconstruction, and remediation recommendations to prevent recurrence. * Serve as the team’s go-to expert in incident management, ensuring a rigorous and consistent approach to handling, escalating, and documenting incidents. Detection Strategy & Threat Hunting * Define the team’s detection strategy, architecture, and methodology. * Lead proactive threat hunting by leveraging CTI and OSINT to identify and neutralize risks before they impact Ledger. * Address the most challenging and emerging detection issues, and translate threat intelligence into concrete improvements in security posture. Architecture & Agentic SOC * Design and optimize the SIEM (Splunk) architecture and SOAR (Torq) workflows that underpin effective detection, triage, and response. * Bring our Splunk environment up to standard and state-of-the-art: data quality and standardization (CIM), data models, search performance, and detection governance. * Build, evolve, and own the architecture of our internal Agentic SOC and our log/data pipeline, and lead the automation of reporting for the SecOps team. * Apply deep expertise in cloud security (AWS, EKS/Kubernetes) and Wiz (CSPM/CNAPP) to harden the cloud and prioritize large-scale exposure. Technical Leadership & Mentoring * Establish the standards, playbooks, and runbooks that the team relies on. * Mentor and foster the technical growth of senior and junior engineers, and act as a force multiplier within SecOps. * Work with the Engineering, Infrastructure, IT, and Cloud teams to align operational security with the organization’s objectives. What we’re looking for: * 9+ years of experience in security operations, incident response, and CSIRT. * A strong track record as a technical expert in incident management, threat hunting, and detection engineering. * Comfortable working both as an individual contributor and as a team player in a fast-paced cloud and SaaS environment. * In-depth expertise in SIEM (ideally Splunk) and SOAR platforms, as well as CTI/OSINT methodologies. * Solid knowledge of AWS security (IAM, audit logs, network configurations, workloads, containers, Kubernetes) and cloud security tools (ideally Wiz, CSPM/CNAPP); experience with an EDR (ideally CrowdStrike). * Strong incident response and forensics skills, with the ability to conduct complex end-to-end investigations. * The ability to automate tasks and reporting using Python, Bash, APIs, GitHub Actions, a SOAR platform, or equivalent. * A solid understanding of infrastructure (cloud, networking, containers, CI/CD) and the ability to build and scale: log/data pipelines, integrations, and internal services. * A strong interest—or experience—in AI applied to security operations, agent-based workflows, and SOC automation. * Rigor and discipline: You follow and improve established processes and ensure consistency in incident handling and reporting; excellent analytical skills, even under pressure. * Clear communication of complex technical concepts to cross-functional teams; ability to document thoroughly and escalate issues with the appropriate level of context; awareness of confidentiality and the proper handling of sensitive information.