Head of Sre

**Position Overview**: Yousign is seeking an experienced **Head of SRE** to lead our Site Reliability Engineering team through a pivotal transformation phase. You will own the technical leadership and people management of a mature 6-person SRE team, driving our infrastructure migration to completion while shaping the future of our Platform organization. This role is critical as we complete our multi-semester infrastructure migration (90% by H1 2026, 100% by EOY 2026) and transition into a phase focused on resilience, scalability, and Platform Engineering excellence. **About the job**: As Head of SRE, you will provide strategic and operational leadership for our Site Reliability Engineering function. You'll be responsible for ensuring the availability, performance, and security of our critical B2B Trust platform serving thousands of customers and millions of users. **Key differentiator**: Our infrastructure runs on **European sovereign cloud** (OVH) rather than hyperscalers (AWS, GCP, Azure). This requires deep expertise in non-managed infrastructure, IaaS, and bare-metal operations - offering unique technical challenges and ownership. You will manage a team with complementary profiles (Infrastructure and Application SREs), drive our Platform Engineering vision (IDP/DevHub), and act as the technical voice during production incidents and crisis situations. This is a **leadership role** requiring both strategic vision (semester roadmap, 1-2 years vision) and hands-on management capabilities (team development, incident leadership, cross-functional collaboration). **Your Team** As Head of SRE, you will lead a team of **6 Site Reliability Engineers** with complementary expertise: - **Infrastructure SREs**: Focus on infrastructure lifecycle, networking, capacity planning, and our ongoing infrastructure migration, housing management. The team is **mature and experienced** (10 years of SRE practice at Yousign) with established processes for incident management, on-call, and production operations. However, the team currently lacks dedicated leadership, with SREs reporting directly to the Director of Engineering Platform. **Your challenge**: Reconstitute strong SRE leadership to guide the team through the final migration phase, build long-term strategic vision, and empower individuals. **Team culture**: The Platform organization values **pragmatism over perfection** ("Keep it simple"), **ownership and autonomy**, and **business-driven decisions**. Technology is a means, not an end. You'll foster a blameless culture focused on continuous improvement and learning from incidents. **Collaboration**: You'll work closely with Engineering Managers, Product teams, Security, and Engineering Council stakeholders. The Platform team operates with a **Platform-as-a-Product mindset**, where product development teams are your users. **Your Missions**: **Team Management and Leadership (40%)**: - Lead, inspire, and grow a team of 6 SREs with diverse profiles (Infrastructure and Application backgrounds) - Create a unified SRE vision while respecting each profile's specificities and career development needs - Provide coaching and mentorship, including for senior/staff engineers on technical leadership - Manage workload, prioritize and make structured recommendations that will be discussed with Engineering management. - Manage external resources: freelancers and specific expertise as needed - Embody and transmit Yousign's vision, values, and Operating Principles **Strategic Vision and Planning (25%)**: - **Complete infrastructure migration successfully**: Drive 90% decommissioning by H1 2026, 100% by EOY 2026 - Define **post-migration strategy**: resilience (eliminate SPOFs), scalability (support growth), rationalization (observability overhaul) - Drive **Platform Engineering vision**: IDP/DevHub implementation to reduce cognitive load for product teams - Perform **long-term capacity planning** (1-2 years): project technical, budget, and headcount needs aligned with business growth - Participate in infrastructure strategy, architecture decisions, and technology trade-offs - Drive **sovereign cloud strategy** (OVH) and non-hyperscaler expertise - Present strategic recommendations to top management with clear business value articulation **Production Management and Crisis Leadership (20%)**: - Ensure **SLA & SLO** for critical B2B trust signature service (thousands of customers, millions of users) - Lead **incident management** with mature processes (on-call, runbooks, war rooms) - Act as **credible spokesperson during crises**: manage communication with internal teams, Engineering Council, and external customers - Establish and execute **crisis communication plans** maintaining trust and transparency - Drive **blameless post-mortems** and continuous improvement culture - Manage **on-call organization** and team mental load - Proactively identify and mitigate risks; strengthen resilience mechanisms - Implement disaster rec