About Guillaume
French
Native or bilingual
English
Native or bilingual
Experience
- GartnerIT Strategy Associate DirectorMay 2025 - Today (1 year and 2 months)Architected tech-driven roadmaps for global clients, converting complex operational bottlenecks into competitive advantages through targeted strategic interventions and emerging technology frameworksAI@Scale roadmap – LuxuryScaled AI from experimentation to enterprise adoption by defining architecture standards and an AI Operating Model. Established a Center of Enablement, delivered an AI Blueprint, and created a governance and security roadmap for GenAIOutcomes : Established AI architecture standards and AI TOM/CoE, mitigating shadow AI risks and enabling secure, coordinated scaling across business unitsIntegration Strategy roadmap – Industrial GoodsDesigned an integration strategy and federated C4E operating model to replace a legacy monolith with an agile hybrid platform.Outcomes : Delivered an actionable integration strategy blueprint based on API-first principles and a costed, multi-year migration roadmap, securing CIO approval and prompting immediate execution by the client
- BCGIT ManagerSeptember 2022 - December 2024 (2 years and 3 months)Partnered with executive leadership to resolve complex architectural bottlenecks, deploying high-impact, tech-enabled interventions that optimized operational resilience and reduced total cost of ownershipIT roadmap – Industrial GoodsEngineered a comprehensive, agile IT transformation strategy focused on scalable core technology and integrated applications, overhauling infrastructure and processes for progressive organizational growth.Outcomes : Developed an ERP-focused IT strategy, aligning operations with future needs, optimizing architecture, structuring IT, and outlining a cost-effective transformation roadmapTarget Operating Model – TelecomCrafted an operational framework incorporating control towers that bridge business and IT, strengthening CIO-led strategies and IT governance for an organization exceeding 2000 employees.Outcomes : Enhanced IT-business synergy, accelerated time-to-market, optimized system updates, strengthened collaboration, and boosted team engagementPhase-Out – Maritime TransportStrategized an exit from a decade-old ERP CDP system for a leading French maritime company, focusing on aligning IT with business needs and set clear objectives, streamlined requirements, and devised a 1.5-year roadmap.Outcomes : 40% effort reduction, alignment of business & IT, and an 80% projected cost savingsDe-Risking – Professional ServicesSteered an ERP (SAP S/4HANA public cloud) IT de-risking project to live status, collaborating with diverse teams to address business and IT vulnerabilities.Outcomes : Overcame a 35M€ budget overrun and 9-month delay to realign the project successfully
- DeloitteManagerFebruary 2016 - September 2022 (6 years and 7 months)Orchestrated the implementation of enterprise-grade IT solutions, streamlining cross-functional operations and aligning multi-year project lifecycles with core business KPIs to achieve peak organizational efficiencyCarve-Out – ChemistryHeading the Separation Office for a global carve-out, leading 30+ professionals managing 200+ applications. Overseeing risks, budget, resources, and strategy to ensure seamless execution, reporting to C-suite.Outcomes : Go-live successfully completed, with full physical separation of both entities achievedFull Scope ERP implementation – ManufacturerProcess lead of several business logistic modules of a full scope SAP S/4HANA implementation, led a team of seven consultants, involved from design to production go-lives.Outcomes : Optimized warehousing, sales, supply chain, and production in civil and military aerospace manufacturingCarve-Out – RetailerOverseeing various IT operations for a retailer undergoing a carve-out, which includes managing the ERP system and the segmentation and establishment of 300+ European stores infrastructures.Outcomes : Established an independent operational structure and systems, ensuring business continuity and setting the stage for autonomous growthFull Scope ERP implementation – RetailerLed a team of four developers to design and implement SAP S/4HANA Cloud purchasing and financial applications, overseeing architecture, development, customization, and rollout.Outcomes : Executed Europe's first SAP S/4HANA public cloud implementation, meeting high standards of quality, within budget and on scheduleE-procurement implementationsLed sourcing and procurement projects, managing a team of three consultants and overseeing design, execution, launch, and training.Outcomes : Streamlined sourcing and procurement processes and reduced transactional costs, leading to better negotiation outcomes
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Education
- Strategy ConsultingStrategy Consulting
- MIAGE Business IT master's degreeParis-Saclay University2016MIAGE Business IT master's degree