Summary: Join Milestone as a Senior Graph DB Engineer to architect and transform our data library into a graph-based system, shaping the future of visual machine learning with real-world impact. Highlights: 1. Shape the future of visual machine learning and AI computer vision. 2. Own and architect the entire graph DB, tools, and strategy. 3. Drive graph DB transformation and ensure best practices. Join Milestone and build technology that pushes boundaries and empowers businesses worldwide. **Impact \& Purpose** Do you want to contribute to the AI computer vision of 2026 and beyond? If you envision that your next role will shape the future of visual machine learning and do it responsibly and with real\-world impact… then please keep reading! **Location: Barcelona, Spain or Copenhagen, Denmark.** **Role Summary** As a **Senior Graph DB Engineer** in **Hafnia** , you will start and enable our journey to index and organize our data library to become graph based. This means a blank slate and the opportunity to architect data and relations as you see fit. Your expertise in graph DB will be critical to search, and cherry pick data for the future of model training. You will become a member in our cross\-functional team to drive our graph DB transformation, ensuring best practices and compliance with industry standards. **What you will do** * Own all aspects of the graph DB, tools, architecture and strategy * Build the right ontology, ensuring clarity, consistency, governance and alignment with our use cases * Drive the end\-to\-end migration from our current setup to the graph database in constant iterations * Build and operate scalable graph ingestion and queries with robust monitoring and QA * Ensure Confidentiality, Integrity and Accessibility of the data with production grade performance * Build awareness on how to best integrate with a graph database and how to leverage its advantage * Create and maintain the documentation regarding the implemented system and best practices that comes with it **What you bring to the team** * Mastery of graph databases and query languages, with a capacity to select the right tool for the job * Advanced knowledge in graph data modeling and ontology design for large\-scale, AI\-focused datasets. * Proficiency in ETL/ELT, streaming ingestion, and Change Data Capture pipelines * Ability to optimize graph performance \- indexing, profiling, partitioning, caching * Knowledge of software development in Python and CI/CD * Familiar with data lineage, governance, security, observability, dataset diversity and data quality enforcement **How will you make a difference** * Experience in building ontology and design graph architecture for computer vision AI model training datasets. * Extensive Experience in data and ML platforms, and in enabling ML/AI workflows using graph\-derived features and embeddings * 5\+ years building and operating graph databases in production at scale * Led end\-to\-end migrations from relational to graph database and further integration to new components Designed and governed enterprise ontologies used by downstream AI/ML pipelines * **About our team** You will join about 35 fantastic colleagues in a fast\-growing and international team that besides the engineering core counts profiles across go\-to\-market, community, product, compliance, design and strategy. We operate as an autonomous product team and share an entrepreneurial mindset and a firm belief that we can cover new grounds to the benefit of the world. We work with trust, collaboration and flexibility as our foundations. **What we offer** * In addition to the exciting challenges of this role, Milestone provides: * Opportunities for professional growth and development. * A supportive company culture and inclusive workplace environment. * Daily meals, snacks, and beverages in our canteen. * Office amenities such as company bikes, a gym, massages, and Friday gatherings. Monthly company events for team bonding and enjoyment. * **Apply Now** We would like to receive your CV in English without a picture; a short custom summary may be integrated into your resume. No cover letter required. If you have any questions, you are very welcome to contact join.hafnia@milestone.dk We would like you to start as soon as possible, and we will hire on an ongoing basis as we interview candidates. Join us in shaping the future of computer vision through engineering and innovation. Let’s build products, services, and your career in a meaningful way together! **About us** Hafnia is a team within Milestone, an international company with development sites in Denmark, Bulgaria, Spain and offices all over the world. We are technology driven as we are developing and maintaining one of the most advanced video management software in the world. Innovation is not only important for us. It is a part of our DNA just as responsible use of technology which we actively support. We believe in trust, mutual respect, a healthy work life balance and room for all voices to be acknowledged. As such, we expect you to engage, speak up, and make a difference for your team, our customers, and yourself. Read more at www.milestonesys.com or hafnia.milestonesys.com for Hafnia specific information.