Functional Analyst API

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

Brussels, hybrid (minimum 2,5 days per week on site)

Context

You join client projects in the banking and/or energy sector, working on business applications integrated with multiple internal and external systems.

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

Requirements

• Minimum 4 years of experience as a Functional Analyst in complex environments (multiple systems, interfaces, stakeholders) within banking and/or energy sector
• Minimum 2 years of hands-on experience with Swagger/OpenAPI and API testing (Postman or similar)
• Proven experience in data modelling (ERD, conceptual and logical models)
• Experience in the banking and/or energy sector
• Good knowledge of SQL
• UML modelling (Enterprise Architect, Lucidchart or similar)
• Familiar with Agile delivery (Scrum, Jira)
• Fluent in English, native in French and/or Dutch

Nice to have

• Python or another scripting language
• Exposure to Azure or other cloud platforms
• Knowledge of regulatory topics (banking) or energy market processes

What we offer

• A dynamic and growth-oriented workplace with start-up energy
• An engaged community of digital experts (Product, Tech, Data, Cybersecurity, Finance)
• Projects with real impact across industries and technological ecosystems
• A people-first environment emphasizing learning, ownership and collaboration
• Internal knowledge sharing, career development support, and mentorship opportunities

At eXalt, we combine the strength of a consulting firm with the agility and innovation of a product-led culture. Join us to build smart, scalable, and human-centered digital solutions.