Career

Senior Java Backend Engineer (m/f/d)

Ontotext, doing business as Graphwise, is looking for Senior Java Backend Engineer. We need your expertise to help us build great knowledge graph products. Knowledge graphs help enterprises ground AI algorithms, reduce hallucinations and represent complex domain models. If you are a skilled backend engineer capable of understanding complex problems, enjoy architecting efficient designs and want to tackle technical challenges, please consider this job opportunity in the Product & Technology division.

About Graphwise

Graphwise enables organizations to realize the full value of enterprise AI by delivering the most comprehensive and trusted industry solutions in the field of knowledge graphs and semantic AI technologies. We deliver the critical knowledge graph infrastructure to ensure enterprises are ready to realize the technology’s full potential. Graphwise, formed by the merger of two tech visionaries: Ontotext and Semantic Web Company, has over 200 employees worldwide and offices located across North America, Europe and the Asia-Pacific region. The working language at the company is English. If you are interested in knowledge organization, AI technology and innovation, Graphwise is the right fit for you!

About the Role

At Graphwise we work in hybrid mode from our offices in Sofia, Vienna and Ruse. You will be expected to spend at least 8 days monthly in one of our offices. Our teams are distributed in squads between 5 and 10 engineers. We do believe that to build a brilliant team, people should meet, collaborate, exchange ideas and maintain healthy human relationships.

As Senior Java Backend Engineer you will be expected to:

  • Design, implement and test new features in the GraphDB backend
  • Review the code of your peers and output high-quality code
  • Improve the database performance by optimizing its concurrency and researching novel algorithms
  • Debug the database code and chase complex to reproduce issues under concurrent transactional load
  • To filter applicants who do not read job descriptions, please submit, in your application form a valid JSON-LD string in the Address field (check https://json-ld.org/playground/) with your name and a link to your LinkedIn profile

Your Profile:

  • 3+ years of experience in Java or another programming language
  • Strong engineering culture, analytical skills and proficiency in multithreading algorithms
  • Deep technical experience in database structures and graphs
  • Experience with knowledge representation, database modelling or logic programming is a big plus
  • A degree in Computer Science, Information Technologies, or a related field

Hiring Process:

Graphwise is a fully transparent company. The hiring process has the following steps:

  • Applications will be filtered based on the required skills – no response will be given
  • Phone screening interview by the HR department
  • Online technical interview to assess the coding/design thinking skills
  • Onsite in-depth technical interview
  • Onsite final meeting with a job interview

What We Offer:

  •  A friendly and professional international team and working environment in a rapidly expanding tech and AI company
  • An exciting and challenging but rewarding, stimulating and vibrant position in an agile, dynamic, diverse and expanding company working in the semantic technologies and artificial intelligence domains
  • Exposure to the newest technologies in AI and knowledge graphs space
  • A workplace in an organization that is committed to sustainability and responsible business practices
  • Flexible working hours and benefits that reflect our belief that a healthy work-life balance is a key driver of efficiency
  • Career development path, through training, hands-on experience, time for innovation, and many more
  • State-of-the-art infrastructure


We would love to have you on our team! Please submit your application here.

Graphwise welcomes applicants of all backgrounds regardless of race, ethnicity, sexual orientation, gender expression, age, disability, and other statuses. Our company culture as well as policies enforced by our active DEI Group work towards ensuring an inclusive workplace.