Technical Architect & Principal D365 F&O Engineer

Technical Architect & Principal D365 F&O Engineer is a hybrid full-time role at On in London, UK, posted 15 Oct 2026.

In shortIn the dynamic landscape of On, technology thrives much like a spirited runner: always moving, always improving. As an integral part of Engineering Leadership reporting to Florian Jensen, Hiring Manager, this role leads the technical development, architecture, and optimization of the D365 F&O platform. The position ensures seamless integrations and a robust, scalable foundation to supercharge the growth of On and support growing global operations.Your Mission Technical Visionary: Define and champion a compelling technical vision for D365 F&O at On, inspiring and guiding the development team to deliver innovative, high-quality solutions. Code Craftsmanship: Promote a culture of clean, efficient, and maintainable code, setting high standards and leading constructive code reviews to uphold best practices. Performance Optimization: Continuously analyze and optimize the D365 F&O platform, identifying bottlenecks and implementing solutions to ensure optimal speed, scalability, and reliability. Technical Design & Architecture: Lead the technical design and architecture for Dynamics 365 F&O, balancing business requirements, industry standards, and technical feasibility. Integration Maestro: Design and oversee integrations between D365 F&O and critical systems. This is including e-commerce platforms, payment gateways, marketing automation tools, CRM systems, and logistics providers—leveraging event-driven architecture, event-driven integration patterns, and asynchronous data flows to ensure seamless and resilient data flow. Development Best Practices: Establish and support development standards, version control, testing methodologies, and deployment processes. Technical Problem Solving: Provide expert technical guidance to the development team, troubleshooting complex issues and resolving operational challenges. Mentorship & Development: Mentor team members, fostering a supportive environment dedicated to continuous learning and knowledge sharing. Stay Ahead of the Curve: Research and evaluate emerging technologies in the D365 F&O ecosystem to identify opportunities for platform enhancement. Your Story Deep Technical Expertise: 12+ years of experience developing and implementing Microsoft Dynamics 365 F&O solutions, with a focus on technical design, development, and performance optimization. D365 F&O Mastery: In-depth understanding of Dynamics 365 F&O architecture, including data models, security models, development frameworks, and APIs. Programming Proficiency: Strong proficiency in X++, C#, and related languages essential for D365 F&O development. Performance Tuning: Proven ability to optimize application performance through database tuning, code optimization, and infrastructure configuration. Integration Expertise: Extensive experience connecting D365 F&O with external systems using modern integration patterns and technologies. Technical Leadership: Demonstrated success in guiding, mentoring, and empowering engineering teams to uphold quality standards. Analytical Thinking: Strong problem-solving skills to navigate and resolve complex technical challenges. Collaboration & Communication: Excellent interpersonal skills with a proven track record of collaborating effectively with developers, business analysts, and cross-functional stakeholders. Domain Knowledge & Continuous Learning: Dedication to staying current with D365 F&O updates, with beneficial familiarity in core finance processes (e.g., order-to-cash, procure-to-pay), cloud platforms (e.g., Azure), Agile/DevOps practices, or relevant Microsoft certifications. Your TeamWe drive transformation. The Digital Engineering team works across the entire organization to create innovative experiences, from e-commerce platforms to internal tools. Our mission is to shape On’s digital future, enhancing customer interactions and supporting business growth with creative and forward-thinking solutions.This is a hybrid role in London working 2 days a week in our office in Spitalfields near Liverpool Street on the Elizabeth Line. We can support relocation for this role. Show more Show less