Technical Architect

Join Keystone Solutions as a consultant for a client-facing mission focused on evolving and maintaining a hybrid integration platform that interconnects diverse information systems hosted on Microsoft Azure and on a private cloud for legacy applications. As a Keystone Solutions consultant, you will define technical architectures for solutions built on the integration platform, particularly for Enterprise Data Management (data referentials) and electronic payment systems, while guiding development teams and contributing to implementation.

Consultancy Model at Keystone Solutions:

This is a consultancy role with on-site collaboration at the client, operating under Keystone Solutions’ consulting framework. You will work closely with the client’s teams, combining on-site presence with remote work, to deliver robust technical architectures, hands-on development, and knowledge transfer. The service model is hybrid at 5 days per week with a minimum of 2 days on site in Brussels., * Evolve the architecture of the integration platform connecting information systems across Azure and a private cloud for legacy applications.

• Ensure ongoing evolution and maintenance of solutions developed on this platform.
• Define technical architectures for solutions on the integration platform, with emphasis on Enterprise Data Management (data referentials) and electronic payment systems.
• Lead a development team during implementations and contribute directly to developing parts or all of the solutions.
• Deliverables include: High Level Design; Technical Architecture Design; Technical Analysis Documents; Development and solution documentation; Handover and coaching of developers.
• Provide services in a hybrid mode: 5 days per week with a minimum of 2 days on site in Brussels., * Architecture of hybrid integration platforms (Azure + private cloud / legacy applications): Level Expert, most recent experience this year.
• Azure (AKS, Azure Service Bus, Azure Event Grid, Azure Storage, Workbooks / Kusto Query Language): Level Advanced, most recent experience this year.
• Docker, containerization principles, Kubernetes, Helm, and Kustomize: Level Advanced, most recent experience this year.
• Enterprise Data Management / data referentials / subscription mechanisms to Authentic Sources: Level Expert, most recent experience this year.
• Integration of electronic payment solutions (Worldline SIPS, Xengo, Terminal CTEP) and CODA files: Level Advanced, most recent experience this year.
• Java 11 / 17 / 21 and J2EE platform: Level Expert, most recent experience this year.
• Quarkus: Level Advanced, most recent experience this year.
• REST, SOAP, WS-Security, SOA, and microservices: Level Expert, most recent experience this year.
• Spring 6.x, JPA/Hibernate, Spring Boot, Spring Batch: Level Expert, most recent experience this year.
• Spring-WS: Level Advanced, most recent experience this year.
• WSO2 Enterprise Integrator (version 6.4 and above) and API Manager (version 2.6 and above): Level Advanced, most recent experience this year., * Consultancy Nature of Work: Operate as a Keystone Solutions consultant embedded with the client, delivering high-impact architecture and engineering outcomes with a blend of on-site and remote work.
• Dynamic Projects: Engage with diverse technical challenges across multiple client environments, from Azure-native workloads to private cloud and legacy integration contexts.
• Turbo-Charged Learning and Development: Access broad learning experiences, cross-domain mentorship, and structured support designed to accelerate your mastery of integration platforms, EDM, payments, and cloud-native practices.
• Ambition Skyrocketing within a Consultancy Framework: Grow your career through varied client engagements, expanding your architectural influence, delivery leadership, and technical depth across modern and legacy ecosystems.

Our Values in Action at Every Client Engagement:

As a K-Stone, you bring excellence, integrity, and client-centric delivery to every mission. You collaborate openly, share knowledge, and drive measurable outcomes while upholding best practices in security, reliability, and documentation. These values guide how we design architectures, lead teams, and transfer knowledge to ensure sustainable solutions for our clients.

How You Will Thrive in This Role:

In this consultancy mission, you will apply your expertise across Azure services, containerization, integration middleware, and Java ecosystems while navigating hybrid constraints between cloud and private infrastructures. You will lead by example, deliver comprehensive design and analysis artifacts, ensure rigorous documentation, and coach development teams to operational excellence-always under the Keystone Solutions consultancy model, closely aligned with client goals.

Do you have experience in Spring Framework?, * Dutch: Limited working proficiency.

• English: Full professional proficiency.
• French: Full professional proficiency., * Do you have a minimum of 10 years of experience in technical architecture for integration solutions?
• Do you master event-driven architecture in a Microsoft Azure environment, notably the design of Topics, Queues, subscriptions, and dissemination strategies aligned with functional needs and data flows?
• Do you master architectural aspects related to Microsoft Azure Functions, including hosting models, access security, identity management/managed identities, network integrations, and operational best practices?
• Describe a hybrid integration architecture you designed or evolved, including applications hosted on Azure and on a private or legacy infrastructure. Specify the technical constraints encountered and the architectural trade-offs made.
• Describe a concrete experience implementing a data referential (EDM) or integration with Authentic Sources. What were the governance, context, and subscription challenges?
• Present an electronic payment integration or inter-institution data exchange you delivered (e.g., Worldline SIPS, Xengo, CTEP, CODA, BCE, Fidus), explaining security, reliability, and traceability constraints.
• Do you have experience in the public sector?
• Describe your approach to compliance and data protection in the development lifecycle, particularly regarding GDPR.