Senior Integration Analyst - Fluent French or Dutch/Brussels

Endeavour Recruitment has an excellent freelance opportunity for a Senior Integration Analyst.

Location: Brussels

Contract: ASAP start until 31st December 2026 with potential for extension

Working Arrangement: Full-time, with 3 days onsite in Brussels

Languages: French and or Dutch and English

Experience: 5+ years

About the Role

An experienced Senior Integration Analyst to join a team in Brussels. In this role, you will play a key part in delivering successful integration projects by bridging the gap between business requirements, solution architecture, and development teams.

You will translate data exchange requirements into clear technical specifications, define and validate API interfaces, and ensure the quality, performance and reliability of integrations through comprehensive testing.

The ideal candidate has strong expertise in API integration, technical analysis, and testing, with experience in integration platforms such as Azure Integration Services and MuleSoft. You will contribute to migration projects, API governance and production support, ensuring robust and secure end-to-end integration solutions.

Key Responsibilities

• Integration Analysis and Specifications
• Gather data exchange requirements from business teams, Product Owners and external partners.
• Create and maintain Interface Design Documents (IDDs), including API contracts, data mappings, transformation rules, error handling, volumes, and SLAs.
• Align integration flows with the target architecture, including xAPI, pAPI and sAPI layers, and identify deviations from API-led architecture principles.
• API Design and Technical Analysis
• Define and review REST API contracts using OpenAPI and SOAP interfaces using WSDL/XSD, in collaboration with architects and developers.
• Design appropriate integration patterns, including synchronous, asynchronous, event-driven, batch and publish/subscribe models.
• Define API security requirements, including OAuth 2.0, certificates, client credentials, API Management subscription keys, JWT and mutual TLS (mTLS).
• Integration Migration Projects
• Analyse existing MuleSoft integration flows, including DataWeave transformations, connectors and orchestrations.
• Identify and document associated business rules.
• Define target integration solutions using Azure Integration Services.
• Ensure functional non-regression and performance across migrated integration flows.
• API Testing and Validation
• Define integration testing strategies in collaboration with Quality Assurance and Testing teams.
• Create and maintain Postman collections, including environments, variables, scripts and token management.
• Execute functional, contract, regression and performance tests.
• Contribute to test automation using Azure DevOps.
• Document, assess and track defects through to resolution.
• Delivery and Production Support
• Validate integration readiness before production deployment.
• Contribute to Go/No-Go decisions.
• Investigate and troubleshoot Level 2 and Level 3 integration incidents using Application Insights, Azure API Management, Service Bus and monitoring tools.
• Documentation and Governance
• Maintain integration documentation in Confluence.
• Keep API catalogues, Interface Design Documents, data mappings and operational runbooks up to date.
• Ensure compliance with API design standards, architecture principles and integration conventions.

Essential Requirements

• Bachelor's or Master's degree in Computer Science, IT or a related field, or equivalent professional experience.
• At least 5 years of experience in integration analysis, API analysis and/or API testing.
• Proven experience delivering end-to-end integration projects, from requirements analysis through to production deployment.
• Experience with Azure Integration Services, MuleSoft, BizTalk, Boomi or comparable integration platforms.
• Strong knowledge of REST, SOAP, OpenAPI, WSDL, JSON and XML.
• Solid understanding of API security, including OAuth 2.0, JWT, TLS and mTLS.
• Hands-on experience with Postman, API testing, troubleshooting and SQL.
• Excellent analytical, problem-solving and communication skills.
• Ability to work independently, with a strong focus on quality, accuracy and teamwork.
• Professional proficiency in French, Dutch and English.

Desirable Skills

• Practical experience with Azure Integration Services, Azure DevOps, Application Insights and Log Analytics (KQL).
• Experience with MuleSoft, DataWeave and event-driven architectures.
• Knowledge of API-led connectivity and integration architecture principles.
• Relevant certifications, such as AZ-900, AZ-204, Azure Integration Services-related certifications or ISTQB Foundation.