{"id":813047,"url":"https://alion.io/job/protegrity-senior-software-engineer-ontology-reasoning-systems","title":"Senior Software Engineer, Ontology & Reasoning Systems","company":{"id":688738,"name":"Protegrity","domain":"protegrity.com","url":"https://alion.io/company/protegrity","size_band":"201-500","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":{"grade":"B","score":75,"open_postings":4,"ghost_share":0,"stale_share":1,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-10-26T05:57:25Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["New York, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":237600,"max":266700,"currency":"USD","period":"year","gross":null,"usd_annual":266700},"salary_estimate":null,"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Go","optional":false},{"name":"Java","optional":false},{"name":"Knowledge Graph","optional":false},{"name":"LLM","optional":false},{"name":"Neo4j","optional":false},{"name":"Prolog","optional":false},{"name":"Python","optional":false},{"name":"RAG","optional":false},{"name":"Rust","optional":false},{"name":"Scala","optional":false},{"name":"Tokenization","optional":false},{"name":"Hallucination","optional":true}],"status":"live","first_seen_at":"2026-06-25T16:19:14Z","employer_posted_date":"2026-10-14","last_verified_at":"2026-10-26T19:07:41Z","board_verified":true,"closed_at":null,"days_open":123,"trust":{"level":"stale","repost_count":1,"flags":["stale"],"days_open":122},"description":"At Protegrity, we lead innovation by using AI and quantum-resistant cryptography to transform data protection across cloud-native, hybrid, on-premises, and open source environments. We leverage advanced cryptographic methods such as tokenization, format-preserving encryption, and quantum-resilient techniques to protect sensitive data. As a global leader in data security, our mission is to ensure that data isn’t just valuable but also usable, trusted, and safe.\nProtegrity offers the opportunity to work at the intersection of innovation and collaboration, with the ability to make a meaningful impact on the industry while working alongside some of the brightest minds. Together, we are redefining how the world safeguards data, enabling organizations to thrive in a GenAI era where data is the ultimate currency. If you're ready to shape the future of data security, Protegrity is the place for you.\nRole Overview\nProtegrity is seeking a Senior Software Engineer, Ontology & Reasoning Systems to design and build the ontology and reasoning layer that connects structured sources, semi-structured metadata, and unstructured documents into a model that supports deterministic machine reasoning.\nIn this role, you will formalize complex domains into entities, relationships, constraints, and rules that allow the system to derive conclusions from underlying facts. A key focus will be making those conclusions explainable and traceable, with clear derivation paths back to the source data and logic that produced them.\nLLMs play an important role at the ingestion boundary, supporting extraction, normalization, and categorization of information from unstructured or ambiguous inputs. The reasoning layer itself must remain deterministic, auditable, and explainable, with appropriate checks on model-generated outputs before they are used as trusted facts.\nYou will work closely with product and research teams to define formal models, improve reasoning quality, and build systems that support accurate, reviewable outputs. This role is well suited for someone with a strong foundation in logic, graph-based systems, formal modeling, and production-grade software engineering.\nWhat You’ll Do\nOwn the ontology and rule layer that unifies structured, semi-structured, and unstructured enterprise data into a single reasoning model.\n\nModel entities, relationships, events, and constraints across heterogeneous sources, and develop rules that derive conclusions from combinations of facts.\n\nUse LLMs at the ingestion boundary for extraction, normalization, and categorization, with appropriate validation of model-generated outputs.\n\nMake system findings traceable by connecting each conclusion to the source facts and rules that produced it.\n\nBuild retrieval capabilities, including vector search, keyword search, and graph traversal, to support reasoning workflows.\n\nImprove quality through entity resolution, constraint modeling, and structured handling of conflicting or overlapping sources.\n\nShip production services and research prototypes with a focus on correctness, reliability, and maintainability.\n\nWhat You’ll Need\n5+ years of experience building backend systems in a modern language such as Python, Go, Java, Scala, Rust, or similar, or equivalent practical experience.\n\nA strong formal and mathematical foundation, including discrete mathematics, logic, and graph theory.\n\nThe ability to reason about soundness, completeness, and tractability, and to express complex domains as formal rules and constraints.\n\nHands-on experience with declarative, logic-based, or rule-based reasoning systems such as Datalog, Answer Set Programming, constraint logic programming, Prolog, production rule engines, SMT solvers, or similar.\n\nPractical experience building LLM-powered systems, including structured extraction, RAG, or classification pipelines, with sound judgment about where model outputs require validation.\n\nDeep experience with knowledge graphs and graph data, including RDF, SPARQL, property graphs, or graph databases such as Neo4j.\n\nExperience designing systems whose outputs trace back to their inputs, including provenance, derivation chains, or evidence trails.\n\nStrong debugging, testing, and validation practices, with attention to correctness.\n\nNice to have\nExperience with constraint satisfaction or deductive reasoning, including CSP, unification, fixpoint or closure computation, or constraint propagation.\n\nExperience with formal ontology and semantics, including OWL, SHACL, description logics, or reasoners.\n\nExperience with LLM evaluation, entity resolution, citation validation, or hallucination reduction.\n\nExperience with symbolic computation, theorem proving, model checking, or formal verification.\n\nShould you accept this position, you will be required to consent to and successfully complete a background investigation. This may include, subject to local laws, verification of extended education and additional criminal and civil checks.\nWe offer a competitive salary and comprehensive benefits with generous vacation and holiday time off. All employees are also provided access to ongoing learning & development.\nEnsuring a diverse and inclusive workplace is our priority. We are committed to an environment of acceptance where you are free to bring your full self to work. All qualified applicants and current employees will not be discriminated against on the basis of race, color, religion, sex, sexual orientation, gender identity, age, national origin, disability or veteran status.\nPlease reference Section 12: Supplemental Notice for Job Applicants in our Privacy Policy to inform you of the categories of personal information that we collect from individuals who inquire about and/or apply to work for Protegrity USA, Inc., or its parent company, subsidiaries or affiliates, and the purposes for which we use such personal information.","description_format":"text","description_chars":5879,"description_truncated":false,"requirements":{"experience_years_min":5,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Generous vacation"],"hiring_locations":[{"name":"United States","iso":"US","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Data Loss Prevention"],"lifecycle":[{"event":"open","at":"2026-09-12T10:41:27Z"},{"event":"close","at":"2026-09-21T18:41:19Z"},{"event":"reopen","at":"2026-10-14T16:26:01Z"}],"visa":[],"liveness":{"score":14,"band":"cold","label":"Long shot","p_open":1,"p_active":0.388,"p_room":0.35,"age_days":122,"expected_fill_days":35,"reasons":["conf:1","win:tail"],"computed_at":"2026-10-26T05:57:25Z"},"pay":{"stated_usd_annual":266700,"is_top_pay":true},"html_url":"https://alion.io/job/protegrity-senior-software-engineer-ontology-reasoning-systems","json_url":"https://alion.io/job/protegrity-senior-software-engineer-ontology-reasoning-systems.json","meta":{"generated_at":"2026-10-26T22:00:22Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":29672,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-27T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":688738},"rest":"https://alion.io/mcp/rest/get_company?id=688738"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fprotegrity-senior-software-engineer-ontology-reasoning-systems"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fprotegrity-senior-software-engineer-ontology-reasoning-systems"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fprotegrity-senior-software-engineer-ontology-reasoning-systems"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/protegrity-senior-software-engineer-ontology-reasoning-systems\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fprotegrity-senior-software-engineer-ontology-reasoning-systems"}]}