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Senior Software Engineer - Offline

Mendix· Technical – R&D
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Hybrid (Rotterdam)€69.1k - €110.6kFull-timePosted 4mo ago

About the role

Join the Runtime & Client group as a Senior Software Engineer to shape offline-first application development, working on offline capabilities for Mendix mobile and web apps across the full stack (client-side runtime, server-side synchronization, and developer tooling).

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

  • >= 6 years of professional software development experience
  • Expert-level proficiency in JavaScript/TypeScript with strong understanding of offline-first patterns and browser storage APIs (Origin Private File System, service workers)
  • Proven experience designing or implementing data synchronization strategies, including conflict detection and resolution mechanisms
  • Ability to work across multiple areas of a product—from client-side runtime to server-side synchronization to developer tooling—and connect those dots effectively
  • Demonstrated commitment to quality and responsibility for impact on developers and end users who depend on it

Skills

Required:JavaScriptTypeScriptData synchronizationOffline-first patterns
Nice to have:PWAs / React Native

Benefits

  • The salary range for this position is €69,100 to €110,600 and this role is eligible to earn incentive compensation.
  • Health and wellness benefits; country-specific benefits via the Siemens benefits page
Last updated Oct 21, 2026. Interested? Apply on the company site.
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