Senior Enterprise Architect for Large-Scale Transformation

SEIDOR; Brussel Hoofdstad; On-site; EUR 120,000 - 160,000; Full time

Job summary

SEIDOR seeks a Senior Technical Expert to design and govern enterprise-grade IT solutions for large-scale digital transformations in a European institutional setting. You will define solution architectures, select technologies, ensure compliance with architecture standards, and present technical solutions to governance boards from Brussels.

The role demands strong leadership, extensive experience in architecture documentation, and deep expertise in integration, security, and non-functional

Qualifications

• Master's degree in CS, software engineering, or equivalent.
• 13+ years IT experience with a Master's.
• 5+ years as Technical Expert or Solution Architect.
• 7+ years producing Architecture Documents (SAD/HLD/DD).
• 7+ years defining integration approaches and API contracts.
• 7+ years addressing non-functional requirements (security, scalability, performance, observability).
• 5+ years with enterprise architecture frameworks and modelling standards (TOGAF, ArchiMate, UML).
• 3+ years presenting architecture solutions before governance boards.

Responsibilities

• Design end-to-end solution architectures aligned with enterprise standards.
• Define integration strategies and API contracts (REST, event-driven).
• Produce Solution Architecture Documents, HLD and DDs.
• Address non-functional requirements (security, scalability, performance, observability).
• Create architecture artefacts such as UML, ArchiMate, deployment, sequence, and data-flow diagrams.
• Lead architecture reviews and present solutions to Architecture Review Boards.
• Ensure solution compliance with governance processes.
• Support development teams with architectural guidance and leadership.
• Maintain architecture documentation throughout the lifecycle.

Skills

Solution architecture

Architecture governance

API design & contracts

Enterprise integration

Leadership/Stakeholder management

Education

Master's degree in Computer Science/Software Engineering or equivalent

Tools

TOGAF

ArchiMate

UML

Job description

SEIDOR seeks a Senior Technical Expert to design and govern enterprise-grade IT solutions for large-scale digital transformations in a European institutional setting. You will define solution architectures, select technologies, ensure compliance with architecture standards, and present technical solutions to governance boards from Brussels.

The role demands strong leadership, extensive experience in architecture documentation, and deep expertise in integration, security, and non-functional