Expert Functional Analyst – Legacy Application Modernisation with Mendix

HumanInTech; Brussel Hoofdstad; Hybrid; EUR 28,000 - 42,000; Part time

Job summary

HumanInTech is seeking a senior functional analyst to join a multidisciplinary team modernising a large legacy application. You will analyse processes, validate migration outputs and translate business needs into user stories, building and maintaining the backlog.

This project runs December 2026 to December 2028 in Brussels, hybrid and 2/5 part-time. Freelance or employee, 6–10 years experience, Bachelor’s or higher, and fluency in Dutch, English and French.

Qualifications

• Expert-level skills in business and functional analysis.
• Expert-level knowledge of UML and BPMN.
• Excellent communication skills.
• Experience with Mendix development.
• Experience migrating applications, processes and data to new platforms.
• Expert-level process optimisation skills.
• Junior-level knowledge of AI in automated migration contexts.
• Fluency in Dutch, English and French.

Responsibilities

• Analyse existing processes and functionalities in the legacy application.
• Validate the output of the migration and modernisation work.
• Translate business needs into user stories.
• Build and maintain the product backlog.
• Prepare and facilitate workshops with stakeholders.
• Produce and maintain functional documentation.

Skills

Functional Analysis

UML

BPMN

Stakeholder Facilitation

Workshops

Multilingual Communication

Education

Bachelor's degree or higher

Tools

Mendix

Job description

What you will do

You will join a multidisciplinary team working on the modernisation of a large legacy application with over 150,000 lines of code and around 20 modules. The application will be migrated to a modern low-code platform using innovative and automated migration methodologies.

Your responsibilities as functional analyst include:

• Analyse existing processes and functionalities in the legacy application
• Validate the output of the migration and modernisation work
• Translate business needs into user stories
• Build and maintain the product backlog
• Prepare and facilitate workshops with stakeholders
• Produce and maintain functional documentation

The project is structured in three phases spread over three budget years. Each phase delivers a standalone result that can be used independently of future phases.

What we are looking for

• Expert-level skills in business and functional analysis
• Expert-level knowledge of UML and BPMN
• Expert-level communication skills
• Confirmed experience with Mendix development
• Confirmed experience in migrating applications, processes and data to new platforms
• Expert-level skills in process optimisationJunior‑level knowledge of artificial intelligence (in the context of automated migration methodologies)
• Active knowledge of Dutch, English and French

The team's approach should leverage modern techniques for application modernisation, including AI, code analysis and model‑driven development, to increase migration efficiency and quality. You must have access to and knowledge of the proposed solution(s) described in the team's vision document.

The setting

This assignment runs from December 2026 to December 2028 (25 months) on a part‑time basis (2/5). The role is hybrid, based in Brussels.

The actual start and volume of work depend on budget approval. Each phase will be ordered separately, and ordering one phase does not guarantee the execution of subsequent phases.

You can join us for this assignment as a freelancer or as an employee of HumanInTech. Same role, same team. If you join as an employee, your employment continues beyond this assignment. When it ends, we'll work together to find your next assignment.

Location: Brussels, hybrid

Work address: Belgium

Employer / contracting party: HumanInTech

Applications close (Brussels time): October 21, 2026 at 2:00 AM

Engagement: Freelance or employed by HumanInTech

Working hours: Full-time

Experience: 6-10 years or more

Education: Bachelor's or more

Published: October 2026