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Jobs at Ontotext AD

Senior/Lead Dev (Data and Ontology Management)

Location: Sofia, Sofia, Bulgaria

Department: Ontotext - DOM Team

Type: Full Time

Min. Experience: Experienced

Senior or Lead Developer, Data and Ontology Management - Ref. OT_DOM

Started in 2001 as a research lab within Sirma Group, Ontotext Corp has become a leading developer of semantic technologies, has grown to 65 people, one of the most innovative and successful Bulgarian companies, and Bulgaria's most successful participant in EU-funded IT research projects.

The Data and Ontology Management Group (DOM) focuses on the "Onto" part of Ontotext: we create semantic web applications by developing and adapting ontologies, creating data mappings and ETL processes, leveraging Linked Open Data (LOD), and using semantic tools and frameworks.

We have gained strong experience in Cultural Heritage, which is at the forefront of Europe's Digital Agenda. We have big clients and interesting projects, including The National Archives (UK), The British Museum (UK), Yale Center for British Art (US), Gothenburg City Museum (SE), Dutch Public Library (NL); see http://www.ontotext.com/clients#culture for details. We are also working towards digitalization of Bulgarian cultural heritage and its publication in the Europeana digital library.

Other vertical areas include media publishing (BBC, UK Press Association), financial/investment research and publishing, eGovernment. We also maintain the FactForge public service and the PROTON ontology.

We are looking for an experienced and talented developer with modeling and design experience, who can lead junior developers, take responsibility for interesting projects and is passionate about innovative technologies.


  • At least 5 years of professional development experience
  • At least 2 years of Java development experience
  • At least 2 years of JavaScript development experience
  • Experience in both backend (Java, JEE, databases) and frontend (JS, AJAX, JSP/JSF/etc)
  • Proven ability to learn and apply new techniques and tools
  • Experience with industrial development tools and techniques, such as SVN/Git, Maven/Ant, scrum/XP, Jira, Confluence, continuous integration, test-driven development


  • Strong aptitude and at least 2 years experience leading others
  • Experience with XML and/or ETL technologies


  • Take technical leadership on projects
  • Research, evaluate, select, learn, apply and adapt new technologies (e.g. RDF, OWL), tools (e.g. Google Refine) and languages (e.g. SPARQL, XQuery)
  • Design and architect solutions
  • Lead junior developers and student interns


We offer:

  • Work in a highly innovative company that is a leader in its area, innovating the next wave of web technologies
  • Work on interesting and challenging projects for highly visible clients
  • Competitive salary in a strong and growing company, excellent career growth opportunities
  • An environment that fosters learning and collaboration
  • Possibilities to work on EU research projects, scientific research, authoring papers, attending conferences

We value smart, awesome people who want to solve hard problems in a fun, collaborative and casual culture.

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