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About me

Data engineer and developer with a focus on linked open data, ontology engineering, and full-stack development.

Robert Nasarek

Robert Nasarek

Data Engineer & Developer

Hi I’m a freelance backend and data engineer specialising in data modelling, ETL pipelines, and data-centric application architecture. I design and implement scalable APIs and backend systems using Python and modern web frameworks like Next.js, Drupal, and Django to build robust data workflows for analytics and machine learning use cases.

My focus is on semantic and structured data systems that turn heterogeneous sources into reliable, queryable, and reusable knowledge. I deliver production-ready solutions, including containerised deployments and reproducible data pipelines, with an emphasis on correctness, performance, and maintainability.

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Services

Data engineering, development, deployment, and ongoing support for your projects.

Data Modelling and Technical ConceptionAnalysis of existing data structures, extension of data models, and extraction of business logic from workflows.
Software Development / CustomisingDevelopment, adaptation, and extension of software components in JavaScript, PHP, and Python, using frameworks such as Next.js/TypeScript, Drupal, and Django.
Deployment and System MigrationContainer-based deployment with Docker, Docker Compose, and Docker Swarm. Migration of existing systems and data, and design and implementation of CI/CD workflows.
Data Import and Data PreparationDevelopment of import workflows, data cleansing, mapping, test imports, error handling, and quality assurance for relational and graph database structures.
Interface and API DevelopmentDevelopment, adaptation, and configuration of APIs, including documentation in Swagger or SPARQL query templates.
Documentation, Technical Support and TrainingCreation of training materials, project support, staff training, onboarding, and preparation and delivery of workshops and training.
MaintenanceKeeping systems operational, applying updates, and implementing release cycles.
Project Coordination and Time ManagementProject planning, sprint coordination, and coordination of time and tasks.

Employers & Customers

Research institutions and organisations I have worked with.

Max Planck Institute for Social Anthropology(Halle/Saale)German National Academy of Sciences Leopoldina(Halle/Saale)German National Museum(Nuremberg)Central Institute for Art History(Munich)German Fairy Tale and Weser Legends Museum(Bad Oeynhausen)Roli-Bar(roli-bar.de)Re-Cycle Halle(Halle/Saale)bold + bündig(Leipzig)Max Planck Institute for Social Anthropology(Halle/Saale)German National Academy of Sciences Leopoldina(Halle/Saale)German National Museum(Nuremberg)Central Institute for Art History(Munich)German Fairy Tale and Weser Legends Museum(Bad Oeynhausen)Roli-Bar(roli-bar.de)Re-Cycle Halle(Halle/Saale)bold + bündig(Leipzig)

Projects

Data- and information-focused websites and applications.

Böhler re:search

Digital edition of the Munich art dealer Julius Böhler's object card system, photo folders and customer index (1903–1948). Research data on traded artworks, transactions and actors.

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Objektsprache und Ästhetik

Shell collections at Leopoldina, Goldfuß-Museum Bonn, and Central Institute for Natural Collections MLU. Historical object references and synonym networks for conchylia.

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SCS Manager

Semantic Co-Working Space for academic university collections. Model, transform, analyse and publish data with JupyterLab, OpenRefine, WissKI and more.

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WissKI

Semantic data management system for GLAM institutions. Virtual research environment extending Drupal with CIDOC CRM, Pathbuilder and linked open data.

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