Java Developer – GraphDB Database

Who are we:

Ontotext received a couple of awards as the most innovative business in Bulgaria. We enjoy unique position providing state of the art semantic technology in two distinct but complementary areas – graph database engines and text analytics. Our solutions have been applied in the areas of publishing (BBC, Financial Times, Oxford University Press), life sciences (Astra Zeneca), cultural heritage (British Museum, Getty Trust), telecommunications (Korea Telecom), government organizations (UK Parliament) and others.

We are looking for:

Backend Java Developer with background in commercial software development, to further evolve the GraphDB database engine using the Java programming language and related tools.
GraphDB is a world leading triplestore – a NoSQL graph database engine, based on Semantic Web standards such as RDF(S), OWL and SPARQL.

Your Role:

Understanding requirements, participating in architectural discussions, software design, implementation, code reviews, unit and functional testing, benchmarking, bug fixing and engagement in the full software development life-cycle.
Software development tasks in our team also include indexing and caching algorithms, query optimization and execution, highly concurrent data structures, high availability cluster architectures, geo-spatial modeling, graph-analysis and integration with 3rd party components for document indexing/retrieval.

Your Profile:

  • Experience in full Java/JEE technology stack;
  • A University Degree in in Computer Science, Information Technologies, or related field;
  • Good understanding of OOPS, Design Patterns and Data Structures;
  • Experience with SQL or NoSQL databases;
  • Interest to learn new technologies like Semantics, OWL, RDF, SPARQL;
  • Experience with build & release tools like Ant, Maven and Continuous Integration like Hudson, Jenkins;
  • Experience working in code versioning tools, such as Git;
  • Capacity to work closely in a team orientated environment;
  • High-responsibility and desire to learn;
  • Very good command of English language.


  • Experience in product development of databases, commercial distributed systems or data warehouse systems;
  • Experience working in agile, scrum, or iterative software development methodology;
  • Familiarity with multi-threaded programming concepts and concurrency problems;
  • Experience working in UNIX/Linux environments.

We Offer:

  • Exposure to leading edge technologies, international projects and collaborations;
  • Collaboration with experienced and highly talented software developers;
  • The chance to participate in the development and delivery of next generation database and search systems;
  • Flexible working time with great opportunities for professional and academic development;
  • Additional Health Insurance;
  • Healthy work-life balance;
  • Excellent remuneration and working conditions.


Interested? Send us your resume to and reference Java Developer- GraphDB Database.

If you don’t see a position that suits your skills, feel free to contact any of our offices and share your background, or send us an email
We are always looking for great people!

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