Technical Expert

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

We are a large company with a start-up spirit. We organize ourselves into expert knowledge Units that collaborate with each other.

"That's why we are looking for curious individuals who are motivated by challenges and eager to grow personally and professionally, to join our team and make a positive impact on the world through technology."

ARE YOU UP FOR THE CHALLENGE?

We want you to be a part of our team, from Brussels, as a Technical Expert .

We are looking for a highly experienced Senior Technical Expert to design and govern enterprise-grade IT solutions for large-scale digital transformation programmes within a European institutional environment.

You will play a key role in defining solution architectures, selecting technologies, ensuring compliance with enterprise architecture standards, and presenting technical solutions to architecture governance boards.

Key Responsibilities

• Design end-to-end solution architectures aligned with enterprise architecture standards.
• Define integration strategies and API contracts (REST, event-driven architectures).
• Produce Solution Architecture Documents, High-Level Design and Detailed Design Documents.
• Address non-functional requirements including security, scalability, performance, maintainability, and 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 architecture guidelines and governance processes.
• Support development teams with architectural guidance and technical leadership.
• Maintain architecture documentation throughout the solution lifecycle.

Mandatory Requirements

Education

• Master's Degree in Computer Science, Software Engineering, or equivalent.

Professional Experience

• Minimum 13 years of relevant IT professional experience with a Master's degree.
• At least 5 years of experience as a Technical Expert, Solution Architect, or equivalent role.

Technical Expertise

• Minimum 7 years producing Solution Architecture Documents, High-Level Designs, and Detailed Designs.
• Minimum 7 years defining integration approaches and API contracts.
• Minimum 7 years addressing non-functional requirements including security, scalability, performance, and observability.
• Minimum 5 years working with enterprise architecture frameworks and modelling standards such as TOGAF, ArchiMate, and UML.
• Minimum 3 years presenting and defending architecture solutions before Architecture Review Boards or similar governance bodies.

Nice to Have

• Experience with cloud-native architectures.
• Experience with Kubernetes and containerized environments.
• Experience with microservices architectures.
• Experience in large-scale public sector or international organizations.
• Experience with architecture governance processes.
• Experience within Event Management, Security & Safety, or Document Management domains.

Languages

• Any additional EU language at B2 level or above is considered an asset