Permanent / Full-time / On site in Ilmenau, Erfurt or Leipzig (3 days per week) / Start ASAP As a Senior Software Engineer in our Meter Data Management (MDM) team, you will combine hands-on software development with technical ownership for a performance-critical product. MDM covers the collection, validation, processing, and management of energy meter data. Our software processes large data volumes and supports critical customer and operational processes within the ZONOS ecosystem. You will provide technical direction within the team, guide solution design, coordinate technical dependencies, and help establish high standards for performance, quality, security, and reliable delivery. This is a technical leadership role without disciplinary people-management responsibility. You will also contribute to migrations between customer systems, ensuring reliable data transfer, validation, integration, and system transition. Provide technical direction and guide decisions from requirements through reliable delivery. Own solution design, APIs, integrations, data flows, non-functional requirements, and technical risks within the team’s scope. Develop and improve scalable software for high-volume, performance-critical data processing. Guide migrations between customer systems, including data transfer, validation, reconciliation, and cutover activities. Coordinate technical dependencies between Product, Platform, Operations, QA, DevOps, Security, and Architecture. Facilitate design discussions, code reviews, technical workshops, and Architecture Decision Records. Define and promote standards for performance, data quality, testing, maintainability, and operational reliability. Support profiling, benchmarking, load testing, monitoring, and performance optimisation. Contribute to backlog refinement, technical estimation, feasibility assessments, and release readiness. Support CI/CD, observability, secure development, and ISO 27001 requirements. Coach and support engineers through knowledge sharing, onboarding, mentoring, and constructive technical feedback. Evaluate suitable agentic AI and AI-assisted engineering solutions while maintaining security and quality standards.