Senior Mendix Developer

Overview

Senior Mendix Developer is responsible for designing, developing, and maintaining high-quality Mendix applications that align with business objectives and software development standards. This role combines strong technical expertise in Mendix with the ability to guide junior developers, collaborate with stakeholders, and drive best practices across the low-code application lifecycle.

Key Responsibilities

Application Development & Architecture

• Design, build, and deploy Mendix applications using best-practice architecture and development patterns.

• Translate business requirements into scalable, maintainable, and high-quality Mendix solutions.

• Develop complex domain models, microflows, nanoflows, workflows, integrations, and UI components.

• Build custom components using java actions (written as per Java best practices & company conventions)

• Design and implement robust Mendix security models (user roles, module roles, entity access, page access, microflow access) strictly adhering to the principle of least privilege and Mendix security best practices

. • Ensure application performance, scalability, reliability, and compliance with enterprise performance standards.

• Conduct thorough code reviews to enforce quality, consistency, and maintainability.

• Implement robust auditing, logging, and monitoring mechanisms while championing true DevOps, BizDevOps, and SecDevOps principles throughout the application lifecycle

• Build productized modules that are reusable in other apps and projects.

• Design and deliver robust Mendix mobile apps with emphasis on reliable offline synchronization, high performance, secure local data handling, custom native functionality, and streamlined iOS/Android build & deployment processes.

Integration & System Design

• Integrate Mendix applications with external systems via REST, SOAP, OData, Kafka, databases, identity providers (OIDC, Azure AD), etc.

• Design highly modular and reusable components (modules, microflows, nanoflows, snippets, document templates). • Strong experience working with Mendix Building Blocks.

• Collaborate with enterprise architects, infrastructure teams, and system owners to align solutions with the broader IT landscape.

• Lead technical discussions with external teams on security, network, and infrastructure topics.

• Engage in detailed technical discussions regarding published/consumed APIs (endpoints, versioning, authentication, rate limiting).

• Design, document, and publish APIs following REST/SOAP best practices.

• Strong documentation discipline: clean/readable code, comprehensive in-app documentation, and complete handover/technical delivery documents (e.g. LLD, API documentation..etc) for clients

Leadership & Collaboration

• Mentor and coach junior and Intermediate-level Mendix developers on best practices and advanced techniques.

• Lead technical discussions, solution-design workshops, sprint planning, and refinement sessions.

• Work closely with product owners, business analysts, and stakeholders to clarify requirements, refine user stories, and define acceptance criteria.

• Promote and enforce Mendix development best practices and reusable components.

• Provide accurate effort estimation for tasks, user stories, enhancements, and bug resolutions.

Requirements:
Quality Assurance & Lifecycle Management

• Ensure proper implementation of CI/CD pipelines, automated deployments, and branching strategies in Git. • Perform systematic unit testing, integration testing, and end-to-end testing; conduct full System Integration Testing (SIT). • Troubleshoot and resolve complex, tricky bugs—including integration, performance, and concurrency issues. • Oversee application lifecycle management: branching strategies, versioning, environment configuration (dev/test/acc/prod), deployment processes, and rollback procedures

Required Skills & Qualifications

Technical Skills

Mendix Advanced or Expert certification (Expert strongly preferred).

• 3+ years of experience developing Mendix applications.

• Delivered Mendix applications into production (at least 1 complex application).

• Expert-level knowledge of domain modeling, microflows, nanoflows, security model, Java actions, JavaScript actions and Mendix best practices.

• Experience with Git-based development, CI/CD pipelines, and automated deployments.

• Strong experience with REST/SOAP web services, API design and documentation and API best practices.

• Proficient in leveraging AI tools (Copilot, Grok, ChatGPT, Maia) to accelerate development, debugging, documentation, design, and professional client/stakeholder communication.

• Proven ability to design and maintain comprehensive documentation (API, Low Level Design…etc).

• Proficient in Microsoft Word and Excel for documentation and reporting purposes.

• Strong Java and JavaScript proficiency for custom actions, debugging complex logic, and performance optimization. • Advanced SQL skills including writing and optimizing complex queries, joins, and indexing.

• Hands-on experience with On-Premise environments and cloud environments (Mendix Cloud, Azure, or OpenShift environments). • Solid understanding of Mendix architecture, integrations, APIs, and security concepts.

• Solid understanding of networking, certificates, firewalls, and proxy configurations in enterprise contexts.

• Performed multiple Mendix Major upgrades

• Strong expertise in Mendix Mobile: offline/sync logic, performance optimization, security, secure mobile storage/encryption, and managing app builds, signing, and store distribution.

Soft Skills

Excellent analytical and problem-solving skills – particularly for complex integration and performance issues under tight deadlines – while remaining calm and positive during high-pressure situations or crises.

• Excellent verbal and written communication skills; ability to write clear, professional client emails and documentation and conduct client-facing discussions.

• Strong stakeholder-management and facilitation skills for workshops and requirement sessions.

• Thrives in agile/scaled-agile and waterfall environments; adept at managing scope, bridging customer expectations, and enforcing process in structured deliveries.

• Highly pro-active: identifies blockers, proposes solutions, and drives initiatives when progress slows down or new opportunities arise

• Proven ability to work independently while leading technical workstreams.

Preferred Experience

Previous experience leading Mendix development teams.

• Experience with Mendix tools such as QSM

• Hands-on experience with containerization (Docker, Kubernetes) and private cloud Mendix deployments

• Participation in Mendix Capture the Flag (CTF) events or proven ability to demonstrate Mendix security vulnerability concepts.