Home › Companies › Graphwise › Senior Java Backend Engineer
Senior Java Backend Engineer
Graphwise · Sofia, Sofia, 1784, Bulgaria · Hybrid · Active · BambooHR
Job facts
| Field | Value |
|---|---|
| Company | Graphwise |
| Title | Senior Java Backend Engineer |
| Normalized title | - |
| Department / team | Engineering |
| Location | Sofia, Sofia |
| Work model | Hybrid / Hybrid |
| Employment type | Full Time |
| Salary | - |
| Status | active |
| ATS provider | BambooHR |
| Posted / first seen | 2025-06-09 / 2026-05-30 |
| Changed / last seen | 2026-05-30 / 2026-06-06 |
Related slices
| Page | What it contains | Open |
|---|---|---|
| Company jobs | Active postings from Graphwise. | Open |
| Company breakdowns | Role, location, ATS, and work model facets for this company. | Open |
| ATS provider jobs | Active postings observed through BambooHR. | Open |
| Provider filtered search | The same provider as a filtered job collection. | Open |
| City jobs | Active postings in Sofia. | Open |
| Department jobs | Active postings in Engineering. | Open |
| Work model jobs | Active Hybrid postings. | Open |
| Lifecycle events | Open, update, close, and reopen events for this posting. | Open |
| Original posting | Canonical source or apply URL captured from the ATS. | Open |
Linked records
| Company | Graphwise |
| Source | 8e1e3678-783c-4d3a-8970-f2ff004d3fd5 |
| ATS provider | BambooHR |
Description
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 unlock ROI for enterprise AI by delivering the most comprehensive and trusted industry solutions in the field of knowledge graphs and semantic AI technologies. Graphwise delivers the critical knowledge graph infrastructure to ensure enterprises are ready to realize the technology’s full potential. Graphwise, which is the result of the merger between tech visionaries Ontotext and Semantic Web Company, has over 200 employees worldwide, with offices located across North America, Europe, and APAC. Our main development offices are in Sofia, Vienna and Ruse
If you are interested in technology and working in a close-knit, dynamic environment, Graphwise might be 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 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:
4+ years of experience in Java or another strongly typed programming language (Rust, CPP, Go etc.)
Strong engineering culture, analytical skills and proficiency in multithreading & algorithmic analysis
Deep technical experience in database internals, structures and graphs
Experience with knowledge representation, database modeling or logic programming is a big plus
A degree in Computer Science, Information Technologies, or a related field
Experience building and maintaining distributed systems
Knowledge of gRPC or similar RPC frameworks
Experience with performance and memory profiling using tools such as Java Flight Recorder (JFR), flame graphs, or similar profiling tools
Familiarity with JVM internals and advanced performance tuning
Hiring process:
Graphwise is a fully transparent company. The hiring process has the following steps:
Applications will be filtered based on the required skills
Phone screening interview by the HR department
Onsite / Online 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
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
An international workspace where more than 65% of colleagues come from across the globe. English is the main working language at the company
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: paid internal & external trainings on an individual and team level; hands-on experience; time for innovation, and many more
And, of course, we offer free tea, coffee, fruit, and snacks
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 Diversity Equity & Inclusion Group work towards ensuring we have an inclusive workplace.
Full job record
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| Org ID | 17e2e90a-240a-47ed-a58b-45c60bc8905e |
| Source ID | 8e1e3678-783c-4d3a-8970-f2ff004d3fd5 |
| Board ID | 8e1e3678-783c-4d3a-8970-f2ff004d3fd5 |
| Provider | bamboohr |
| Provider Job Key | 90 |
| Title | Senior Java Backend Engineer |
| Normalized Title | — |
| Status | active |
| Active | yes |
| Location Text | Sofia, Sofia, 1784, Bulgaria |
| Department | Engineering |
| Team | — |
| Employment Type | full_time |
| Workplace Type | hybrid |
| Remote Policy | hybrid |
| Country | — |
| Region | Sofia |
| City | Sofia |
| Salary Raw | — |
| Salary Min | — |
| Salary Max | — |
| Salary Currency | — |
| Salary Period | — |
| Source URL | https://graphwise.bamboohr.com/careers/90 |
| Apply URL | https://graphwise.bamboohr.com/careers/90 |
| First Seen At | 2026-05-30 05:57:16Z |
| Last Seen At | 2026-06-06 09:46:36Z |
| Last Checked At | 2026-06-06 09:46:36Z |
| Last Changed At | 2026-05-30 05:57:16Z |
| Inactive At | — |
| Source Posted At | 2025-06-09 00:00:00Z |
| Source Updated At | — |
| Raw Payload Uri | s3://job-postings-prod-raw-590183727216/raw/provider=bamboohr/board=graphwise/date=2026-06-06/2026-06-06T09-46-34-064Z-2e91e0966b83e5808f2baf32f723a79e45126e837afc8a1e324c31b7eabbbf1f.json |
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"description": "<p><span>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.</span></p>\n<p><br></p>\n<p><!-- /wp:paragraph --><!-- wp:heading --></p>\n<p><span style=\"font-family: Inter, sans-serif; font-size: 18pt\"><span style=\"font-weight: bold\">About Graphwise:</span></span></p>\n<p><!-- /wp:heading --><!-- wp:paragraph --></p>\n<p><span>Graphwise enables organizations to unlock ROI for enterprise AI by delivering the most comprehensive and trusted industry solutions in the field of knowledge graphs and semantic AI technologies. Graphwise delivers the critical knowledge graph infrastructure to ensure enterprises are ready to realize the technology’s full potential. Graphwise, which is the result of the merger between tech visionaries Ontotext and Semantic Web Company, has over 200 employees worldwide, with offices located across North America, Europe, and APAC. Our main development offices are in Sofia, Vienna and Ruse</span></p>\n<p><span>If you are interested in technology and working in a close-knit, dynamic environment, Graphwise might be the right fit for you!</span></p>\n<p><br></p>\n<p><!-- /wp:paragraph --><!-- wp:heading --></p>\n<p><span style=\"font-size: 18pt\"><span style=\"font-weight: bold\">About the Role</span></span></p>\n<p><span>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</span></p>\n<p><br></p>\n<p><span style=\"font-size: 18pt\"><span style=\"font-weight: bold\">As Senior Backend Engineer you will be expected to:</span></span></p>\n<p><!-- /wp:heading --><!-- wp:list --></p>\n<ul>\n<li><span>Design, implement and test new features in the GraphDB backend</span></li>\n<li><span>Review the code of your peers and output high-quality code</span></li>\n<li><span>Improve the database performance by optimizing its concurrency and researching novel algorithms</span></li>\n<li><span>Debug the database code and chase complex to reproduce issues under concurrent transactional load</span></li>\n<li><span>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</span><br><br></li>\n</ul>\n<p><!-- /wp:list --><!-- wp:heading --></p>\n<p><span style=\"font-size: 18pt\"><span style=\"font-weight: bold\">Your Profile:</span></span></p>\n<p><!-- /wp:heading --><!-- wp:list --></p>\n<ul>\n<li><span>4+ years of experience in Java or another strongly typed programming language (Rust, CPP, Go etc.)</span></li>\n<li><span>Strong engineering culture, analytical skills and proficiency in multithreading & algorithmic analysis</span></li>\n<li><span>Deep technical experience in database internals, structures and graphs</span></li>\n<li><span>Experience with knowledge representation, database modeling or logic programming is a big plus</span></li>\n<li><span>A degree in Computer Science, Information Technologies, or a related field</span></li>\n<li><span>Experience building and maintaining distributed systems</span></li>\n<li><span>Knowledge of gRPC or similar RPC frameworks</span></li>\n<li><span>Experience with performance and memory profiling using tools such as Java Flight Recorder (JFR), flame graphs, or similar profiling tools</span></li>\n<li><span>Familiarity with JVM internals and advanced performance tuning</span><br><br></li>\n</ul>\n<p><!-- /wp:list --><!-- wp:heading --></p>\n<p><span style=\"font-size: 18pt\"><span style=\"font-weight: bold\">Hiring process:</span></span></p>\n<p><!-- /wp:heading --><!-- wp:paragraph --></p>\n<p>Graphwise is a fully transparent company. The hiring process has the following steps:</p>\n<p><!-- /wp:paragraph --><!-- wp:list --></p>\n<ul>\n<li>Applications will be filtered based on the required skills </li>\n<li>Phone screening interview by the HR department</li>\n<li>Onsite / Online technical interview</li>\n<li>Onsite final meeting with a job interview</li>\n</ul>\n<p><br></p>\n<p><!-- /wp:list --><!-- wp:heading --></p>\n<p><span style=\"font-size: 18pt\"><span style=\"font-weight: bold\">What We Offer:</span></span></p>\n<p><!-- /wp:heading --><!-- wp:list --></p>\n<ul>\n<li>A friendly and professional international team and working environment in a rapidly-expanding tech and AI company</li>\n<li>Exposure to the newest technologies in AI and knowledge graphs space</li>\n<li>A workplace in an organization that is committed to sustainability and responsible business practices</li>\n<li>An international workspace where more than 65% of colleagues come from across the globe. English is the main working language at the company</li>\n<li>Flexible working hours and benefits that reflect our belief that a healthy work-life balance is a key driver of efficiency</li>\n<li>Career development path, through: paid internal & external trainings on an individual and team level; hands-on experience; time for innovation, and many more</li>\n<li>And, of course, we offer free tea, coffee, fruit, and snacks</li>\n</ul>\n<p><br></p>\n<p><!-- /wp:list --><!-- wp:paragraph --></p>\n<p>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 Diversity Equity & Inclusion Group work towards ensuring we have an inclusive workplace.</p>\n<p><span> </span></p>\n<p><span> </span></p>",
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