Senior Enterprise Architect specialized in Build vs Buy Strategy and CRM

Senior Enterprise Architect specialized in Build vs Buy Strategy and CRM – 2 months – Brussels, Belgium

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About the Role

RELYzIT Talent is seeking a Senior Enterprise Architect (freelance) to lead a high-impact, strategic mission for our client in Brussels. You will drive a pivotal Build vs Buy analysis for next-generation CRM and business platforms, shaping the digital backbone of a major public sector organization. Your expertise will directly influence technology choices that affect thousands of users and the future of public service delivery. This is a freelance assignment, estimated at 2 months (approx. 30 days), with partial remote flexibility.

Why This Role Matters

Our client is at a critical crossroads: modernizing core IT applications and processes that underpin association management, approvals, inspections, and subsidies. Your mission is to consolidate extensive prior studies and deliver a decisive, objective comparison of three strategic scenarios: Salesforce Public Sector Solutions, Microsoft Dynamics 365/Power Platform, and custom development. The outcome will empower executive decision-makers to select the optimal path for digital transformation, operational efficiency, and regional collaboration.

What You’ll Be Doing

• Lead a comprehensive comparative analysis of CRM and business platform solutions, leveraging existing studies and business requirements.


• Develop a detailed Fit-Gap matrix for Salesforce, Microsoft Dynamics 365/Power Platform, and custom development, mapping each solution’s coverage of documented requirements.


• Analyze and compare target architectures for each scenario, addressing components, hosting, identity management, security, integrations, governance, operations, support, and future scalability.


• Conduct a robust economic analysis, including investment and recurring costs, TCO over 5 and 10 years, and clearly documented assumptions.


• Establish realistic implementation roadmaps for each scenario, detailing phases, durations, workloads, dependencies, resources, and transition criteria.


• Identify and assess key risks for each solution, including implementation, skills availability, long-term maintenance, licensing, integrations, security, GDPR, NIS2, reversibility, and vendor dependency.


• Evaluate the value and constraints of regional mutualization versus a COCOF-specific solution, considering financial, organizational, and operational impacts.


• Produce a comprehensive, decision-support report with executive summary, enabling clear comparison and informed decision-making by senior management.


• Present findings and recommendations to the client’s Management Committee.

What We’re Looking For

• Proven expertise in Enterprise and Solution Architecture, with a strong track record in public sector digital transformation.


• Deep experience with CRM platforms, especially Salesforce and Microsoft Dynamics 365/Power Platform.


• Demonstrated ability to lead Build vs Buy analyses, including custom solution evaluation, workload estimation, maintainability, and reversibility.


• Strategic thinker with hands-on skills in business case development, TCO/ROI analysis, Fit-Gap analysis, and risk management.


• Strong project governance, change management, and decision-support documentation skills.


• Builder mindset: ownership, autonomy, and a drive to deliver actionable, high-impact outcomes.


• Experience working with multidisciplinary teams and engaging with executive stakeholders.

Technical Skills & Competencies

• Enterprise Architecture (Expert)


• Solution Architecture (Expert)


• IT Systems Urbanization


• IT Governance


• Business Case Development


• TCO and ROI Analysis


• Fit-Gap Analysis


• Risk Analysis


• Salesforce (Expert)


• Microsoft Dynamics 365 (Expert)


• Microsoft Power Platform (Expert)


• Custom Solution Analysis & Build vs Buy Strategy


• Development Workload Estimation


• Maintainability & Reversibility Analysis


• Transformation Roadmap Development


• Project Governance & Change Management


• Decision-Support File Creation


• Artificial Intelligence (AI) (Expert)


• Information Security Management (Expert)


• Public Procurement Expertise (Expert)


• Public Sector Experience (Expert)

Desired Experience

• Experience in the Belgian public sector or similar environments


• Knowledge of public procurement processes


• Expertise in GDPR and NIS2 compliance


• Understanding of mutualization of public platforms


• Familiarity with subsidy, approval, and inspection management


• Experience with the associative/non-commercial sector

Language Proficiency

• Professional proficiency in English (required)


• French and/or Dutch proficiency is a strong asset

Other Requirements

• Availability for a 2-month freelance assignment (approx. 30 days)


• Partial remote work possible; on-site presence in Brussels as required


• Ability to collaborate with client-side architects, business analysts, and solution specialists


• Strong communication and presentation skills for executive audiences