Mendix - Senior Software Engineer

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Senior Software Engineer - Offline

Rotterdam

Technical - R&D /

Full-time /

Hybrid

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About Us

We are a leading global software company dedicated to the world of computer aided design, 3D modeling and simulation- helping innovative global manufacturers design better products, faster! With the resources of a large company, and the energy of a software start-up, we have fun together while creating a world class software portfolio. Our culture encourages creativity, welcomes fresh thinking, and focuses on growth, so our people, our business, and our customers can achieve their full potential.

Position Overview

Join our Runtime & Client group as a Senior Software Engineer and help shape the future of offline-first application development. You'll work on the offline capabilities that power Mendix mobile and web apps-building the foundation that enables applications to keep running when there's no network connection. From local data storage and background synchronization to conflict resolution when devices reconnect, you'll solve complex technical challenges and make them simple for developers and non-technical users alike. Working across the full stack-client-side runtime, server-side synchronization, and developer tooling-you'll have the opportunity to connect the dots and create resilient, offline-capable experiences that matter.

Key Responsibilities

• Design, develop, and maintain offline runtime components and synchronization layers that power Mendix applications across web and mobile platforms

• Implement and optimize data synchronization strategies, including conflict detection and resolution mechanisms between offline clients and backend systems

• Collaborate across the full product stack-from client-side runtime code to server-side logic to Studio Pro tooling-to deliver cohesive offline-first experiences

• Mentor team members and contribute to technical architecture decisions that balance complexity with usability for developers and end users

• Participate in code reviews, testing, and quality assurance to ensure robust, performant solutions that meet production standards

• Stay current with emerging web technologies, offline-first patterns, and browser APIs to continuously improve our platform

Qualifications:

Required:

• Expert-level proficiency in JavaScript/TypeScript with a strong understanding of offline-first patterns and browser storage APIs (such as Origin Private File System or service workers)

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