Mendix developer

Alsena; Brussel Hoofdstad; On-site; EUR 70,000 - 110,000; Full time

Benefits offered by this job

Brussels-based, on-site/teleworkingArr

Job summary

Alsena is seeking a highly experienced Mendix Developer / Low-Code Expert to join a major international IT project in Brussels. You will design, develop and maintain secure, scalable Mendix applications within an Agile team.

You will work on enterprise integrations, application security, reusable components and production support, applying secure-by-design principles and WCAG accessibility standards. English C1 is required.

Qualifications

• At least 5 years of IT development experience.
• At least 3 years of hands-on Mendix development experience.
• Mendix Advanced Developer certification or higher.
• Experience delivering at least two Mendix applications into production.
• Practical experience with Mendix 10 or later.
• Experience integrating Mendix applications with enterprise systems.
• Experience with on-premises and/or private-cloud environments.
• Experience working in Scrum or another Agile development framework.
• Strong understanding of application security, testing, integration, maintainability and software-development best practices.
• English at C1 level.

Responsibilities

• Translate business requirements and user stories into robust Mendix applications.
• Design domain models, workflows, user interfaces and application security roles.
• Develop integrations with internal and external systems using REST APIs, database connectors and enterprise authentication mechanisms.
• Work with authentication technologies such as SAML and OIDC.
• Develop reusable Mendix modules, widgets and components.
• Contribute to shared development standards and best practices.
• Apply secure-by-design principles, role-based access control and data-protection requirements.
• Develop accessible interfaces in line with WCAG 2.1 AA standards.
• Write unit and automated tests and participate in code reviews.
• Monitor application quality and contribute to the management of technical debt.
• Support deployments, release management and third-level production support.
• Produce and maintain technical documentation.
• Contribute to the continuous improvement of Mendix development practices.

Skills

Mendix 10+

Low-Code Application Development

Microflows / Application Workflows

REST APIs & Enterprise Integrations

SAML / OIDC

Role-Based Access Control

Java

Application Security

Testing & Quality Assurance

Production Support

Agile / Scrum

Technical Documentation

WCAG 2.1 AA Accessibility

Job description

We are looking for a Mendix Low-Code Expert to join a major international IT project within a European institutional environment in Brussels.

You will be responsible for designing, developing and maintaining secure, scalable and accessible business applications using Mendix. Working within an Agile and multidisciplinary environment, you will collaborate with business analysts, UX/UI specialists, testers and project teams to transform business requirements into robust digital solutions.

The role also involves enterprise integrations, application security, reusable components, testing, deployment and production support.

Your Role:

As a Mendix Low-Code Expert, you will:

• Translate business requirements and user stories into robust Mendix applications.
• Design domain models, workflows, user interfaces and application security roles.
• Develop integrations with internal and external systems using REST APIs, database connectors and enterprise authentication mechanisms.
• Work with authentication technologies such as SAML and OIDC.
• Develop reusable Mendix modules, widgets and components.
• Contribute to shared development standards and best practices.
• Apply secure-by-design principles, role-based access control and data-protection requirements.
• Develop accessible interfaces in line with WCAG 2.1 AA standards.
• Write unit and automated tests and participate in code reviews.
• Monitor application quality and contribute to the management of technical debt.
• Support deployments, release management and third-level production support.
• Produce and maintain technical documentation.
• Contribute to the continuous improvement of Mendix development practices.

The Profile We Are Looking For:

We are looking for a highly experienced Mendix Developer / Low-Code Expert with a strong software-development background and proven experience delivering enterprise applications.

You should have:

• At least 5 years of IT development experience.
• At least 3 years of hands‑on Mendix development experience.
• Mendix Advanced Developer certification or higher.
• Experience delivering at least two Mendix applications into production.
• Practical experience with Mendix 10 or later.
• Experience integrating Mendix applications with enterprise systems.
• Experience with on‑premises and/or private‑cloud environments.
• Experience working in Scrum or another Agile development framework.
• Strong understanding of application security, testing, integration, maintainability and software-development best practices.
• English at C1 level.

Key Skills:

• Mendix 10+
• Low-Code Application Development
• Microflows / Application Workflows
• REST APIs & Enterprise Integrations
• SAML / OIDC
• Role-Based Access Control
• Java
• Application Security
• Testing & Quality Assurance
• Production Support
• Agile / Scrum
• Technical Documentation
• WCAG 2.1 AA Accessibility

Desired Qualifications:

The following would be considered strong advantages:

• Experience working within a European institution, public administration or other large-scale public-sector environment.
• Experience with Mendix AI capabilities, including GenAI connectors or Maia.
• Experience leading or contributing to complex enterprise Mendix implementations.
• Experience developing reusable Mendix components and shared application libraries.

Additional Information:

• Working regime: Full-time
• Environment: International and multicultural
• Language: English C1 required; French is considered an advantage
• Work arrangement: Brussels-based; specific on‑site/teleworking arrangements will be communicated during the recruitment process.

What We Offer:

Joining Alsena means contributing to high-impact international IT projects within a complex and multicultural environment.

You will have the opportunity to work on large-scale digital solutions, strengthen your expertise in Mendix, low-code development, enterprise integrations, application security and cloud environments, and contribute to modern applications used in a demanding institutional context.

You will work alongside experienced technical professionals while gaining exposure to complex enterprise systems and modern software-development practices.