API Functional Analyst – Data Modeling (Hybrid, Brussels)

eXalt; Brussel Hoofdstad; Hybrid; EUR 55,000 - 75,000; Full time

Benefits offered by this job

Dynamic workplace

Digital experts

Impact projects

People-first culture

Mentorship

Career development

Job summary

Join eXalt in Brussels as a Functional Analyst, contributing to business applications integrated with multiple systems in banking and/or energy. You will gather requirements, write use cases, and design APIs with Swagger/OpenAPI, while supporting developers and coordinating UAT.

We expect 4+ years in complex environments, strong data modelling skills, and fluent English with native French or Dutch. This role is hybrid with on-site collaboration and growth opportunities.

Qualifications

• Minimum 4 years as a Functional Analyst in banking and/or energy sectors.
• Minimum 2 years hands-on Swagger/OpenAPI and API testing (Postman or similar).
• Experience in data modelling (ERD, conceptual and logical models).
• Proven banking/energy sector experience.
• Good knowledge of SQL.
• UML modelling with tools (EA, Lucidchart or similar).
• Familiar with Agile delivery (Scrum, Jira).
• Fluent in English, native French and/or Dutch.

Responsibilities

• Gather and analyse business requirements with business and IT stakeholders.
• Write functional specifications (use cases, user stories, process and sequence diagrams).
• Specify, document and test APIs (REST/SOAP) using Swagger/OpenAPI and Postman.
• Design and maintain logical and conceptual data models.
• Support developers during implementation and clarify functional questions.
• Prepare and execute functional tests, coordinate UAT.
• Analyse and follow up incidents and change requests.

Skills

Functional analysis

API testing

Swagger/OpenAPI

Postman

Data modelling

SQL

UML modelling

Agile/Scrum

Jira

English (fluent)

French/Dutch (native)

Tools

Swagger/OpenAPI

Postman

Enterprise Architect

Lucidchart

SQL tooling

Job description

Join eXalt in Brussels as a Functional Analyst, contributing to business applications integrated with multiple systems in banking and/or energy. You will gather requirements, write use cases, and design APIs with Swagger/OpenAPI, while supporting developers and coordinating UAT.

We expect 4+ years in complex environments, strong data modelling skills, and fluent English with native French or Dutch. This role is hybrid with on-site collaboration and growth opportunities.