The expertise behind AL-AQSA

A focused independent digital-development partner based in the Netherlands.

Senior expertise. Direct collaboration.

Work directly with Yamen Khalifa, owner of AL-AQSA and a senior Mendix, software, and web developer with 8+ years of professional experience.

Connect on LinkedIn

Mendix Advanced certified PSM I Azure Fundamentals 8+ years of professional experience 5+ years of hands-on Mendix experience

Professional credentials

Mendix Advanced Developer (2023) · Professional Scrum Master I (2022) · Microsoft Azure Fundamentals AZ-900 (2024)

Technical capabilities

Mendix 8 / 9 / 10 / 11 · Java · JavaScript · PostgreSQL · MySQL · REST / OData / SOAP · SaaS · RBAC · PWA · Native mobile · AI service integration · SAML / OIDC · SSO · WCAG 2.1 AA · AI / GenAI

Professional experience before AL-AQSA

The following roles describe Yamen’s professional experience. They are not presented as projects delivered through AL-AQSA or as client endorsements.

RentVisie · Mendix Developer

02/2026–10/2026 · Amsterdam

Developed a responsive Mendix PWA connected to existing enterprise applications through REST APIs and bidirectional data exchange. Built reusable modules for cars, bikes, property, equipment, and other rentable assets.

Implemented granular permissions across data, pages, features, and business processes, alongside Peppol electronic invoicing and tiered SaaS subscriptions configurable by asset type, branch, or group.

Worked with architects and high-code developers on API contracts, integration architecture, performance, reservations, planning, digital contract signing, and utilization-based pricing.

Mendix 10 / 11 · PWA · REST / JSON · SOAP / XML · PostgreSQL · Peppol · SaaS · RBAC · Java · JavaScript · WCAG 2.1 AA · AI / GenAI

Automated and unit testing

WelcomeApp! · Mendix Consultant

01/2025–08/2025 · Amsterdam

Designed, built, and maintained Android, iOS, and Progressive Web Applications using Mendix, external APIs, and responsive interfaces.

Integrated Google Translation API with a custom Mendix glossary for context-aware multilingual content. Connected an external AI service that processed websites, PDFs, and images and generated application objects from the extracted information.

Improved responsiveness, load times, and memory efficiency, and supported debugging, troubleshooting, recruitment, and development-team growth.

Mendix · Android / iOS · PWA · Java · JavaScript · WCAG 2.1 AA · AI / GenAI · Google Translation API · PostgreSQL · OData · REST / JSON

Blue Green Solutions · Mendix Consultant

06/2022–11/2024 · Amsterdam

Delivered Mendix solutions across public-sector, financial, distribution, urban-development, and internal business platforms. Contributions covered integrations, security, data processing, custom widgets, refactoring, and performance.

Selected contributions during this role

Community mobile applications: developed municipality announcement and channel features, rebuilt push notifications, and implemented complex role-based access requirements.
Financial workflows: developed dynamic interfaces and data-processing functionality, customized widgets, migrated Excel data, and built OQL search capabilities.
Rule-based distribution: developed configurable rules, visualized complex decision logic, and optimized the processing engine.
Large-scale archiving: designed a high-performance module handling millions of application objects using Queue Tasks and OQL in a cloud financial application.
Environmental monitoring: developed noise-study functionality, connected monitoring equipment through APIs, and built graphs, custom widgets, map layers, and Google Maps features.
Internal operations: developed and refactored finance, invoicing, reimbursements, commuting, leave, and sickness functionality, including Google SSO and external integrations.

Mendix · OQL · PostgreSQL · Queue Tasks · REST · Google Maps · SAML / OIDC · SSO · Google SSO

Motopp · Mendix Developer Accelerator Program

01/2022–06/2022 · Amsterdam

Built Mendix applications from scratch with Product Owners, translating business requirements into domain models, pages, microflows, nanoflows, security, integrations, OData services, Java actions, and validation. Applied debugging, logging, performance tuning, version control, and deployment practices.

Mendix · PWA · REST · SOAP · OData · Java · Security

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