{"id":3274707,"url":"https://alion.io/job/valarian-senior-data-engineer-ontology-knowledge-graphs","title":"Senior Data Engineer - Ontology & Knowledge Graphs","company":{"id":690001,"name":"Valarian","domain":"valarian.com","url":"https://alion.io/company/valarian","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Lever","truth_index":{"grade":"A","score":96,"open_postings":6,"ghost_share":0,"stale_share":0.167,"repost_share":0,"time_to_fill_p50_days":59,"computed_at":"2026-10-30T05:48:23Z"}},"role":"Data Science","role_family":"Data Science","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":["London, United Kingdom"],"countries":["GB"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":87000,"max_usd":171000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":52},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Darktrace","optional":false},{"name":"Knowledge Graph","optional":false},{"name":"Neo4j","optional":false},{"name":"Perplexity","optional":false},{"name":"Python","optional":false},{"name":"SQL","optional":false}],"status":"live","first_seen_at":"2026-10-26T10:57:02Z","employer_posted_date":"2026-10-26","last_verified_at":"2026-10-30T03:47:10Z","board_verified":true,"closed_at":null,"days_open":3,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":3},"description":"Valarian: A New Era of Sovereign Intelligence\nValarian is a dual use technology company building critical tools to safeguard the future in an era of evolving global security challenges. Backed by a Series A funding round of $50m led by NEA, we are rethinking security beyond traditional military domains to address asymmetric threats that impact our technological advantage, economic strength, and democratic institutions. We provide the control infrastructure that allows government and regulated enterprise to put frontier-class AI to work safely.\nWe are bringing a frontier AI experience inside secure boundaries for the first time. Our technology supports mission critical workflows across government, healthcare, and enterprise, including:\nScaling open-weight models without external inference endpoints.\n\nPutting frontier class AI to work across organisations through partnerships with other leading AI startups such as Perplexity.\n\nIncreasing operational resiliency for air gapped, on prem, and cloud based systems.\n\nSecuring intellectual property and maintaining auditability for high stakes enterprise environments.\n\nFacilitating secure information flow during disaster response, M&A due diligence, and privileged legal communications.\n\nWe’ve only scratched the surface. Built in Britain by veterans of the Ministry of Defence, British Forces, Darktrace, and elite engineering backgrounds, we are driven by a shared mission to safeguard western democracy . Whether you join our London HQ or our wider global organisation, you’ll be part of a collaborative, high performing team creating the cutting edge software and infrastructure that defines the frontier of enterprise AI.\nThe Role\nYou will design and build the data foundations that allow ACRA applications and Valarie to understand organisational information. Your work will turn heterogeneous sources into coherent entities, relationships and queryable data products across graph, relational and NoSQL databases.\nWhat you’ll do:\nWork with product teams and domain experts to define and evolve ontologies covering organisational entities, relationships, classifications and business rules.\nBuild ingestion and transformation pipelines from APIs, databases, documents, files and events into canonical data models.\nImplement entity resolution, deduplication and source reconciliation, retaining provenance and handling conflicting or uncertain information.\nDesign and maintain graph models, relational schemas and NoSQL structures, choosing representations according to query and consistency requirements.\nDevelop efficient queries and data interfaces for applications, retrieval services and AI tools, with traceable results.\nImplement automated tests for transformation correctness, semantic constraints, relationship integrity and source-to-target reconciliation.\nPreserve source permissions, classification and retention requirements through derived datasets and graph relationships.\nOwn model evolution and migration logic, partnering with DataOps on deployment, backfills and recovery.\nWhat you’ll bring:\nStrong production Python engineering and experience building maintainable, tested ingestion and transformation pipelines.\nStrong SQL, including relational modelling, transactions, indexing, migrations and query optimisation.\nPractical NoSQL experience, including document or key-value modelling, indexing and consistency trade-offs.\nProduction experience designing, populating and querying a graph database or triple store-for example, Neo4j with Cypher, or an RDF store with SPARQL.\nPractical ontology design experience: clear entity definitions, stable identifiers, relationship semantics, controlled vocabularies, constraints and versioning.\nUnderstanding of property graphs and RDF-based knowledge graphs, including when each approach is appropriate.\nExperience integrating heterogeneous sources, resolving entity identity and maintaining provenance and lineage.\nExperience handling incremental updates, deletions, schema changes and automated data validation.\nAbility to translate ambiguous domain requirements into documented models, useful queries and reliable data interfaces.\nBenefits\nOur benefits are designed to ensure our employees feel taken care of and are proud to be a part of the Valarian team. We are committed to consistently enhancing our benefit package, taking into account the overall well-being and needs of our teammates. Here are the key benefits accessible to all employees at Valarian Technologies:\nEquity - because you have the right to own what you’re building\n\nA competitive salary - because we value your unique skills\n\nEmployer pension contributions - because you deserve a secure future\n\nPrivate health insurance - because your health is important to us\n\nHybrid work setup - because everyone has different needs\n\nGym memberships - because staying active fuels productivity\n\nRewarding company retreats and meetups that respect your work/life balance - because we love getting to know each other\n\nLife at Valarian\nOur culture is built on inclusivity, compassion and flexibility - we want everyone to be empowered to achieve their goals at Valarian.\nThe work we do is vital, but so are the connections that make it happen. We thrive on the shared energy, spontaneous conversations, and mutual trust built when we spend time together. We operate on an office first hybrid model, regularly gathering in our London office to support one another and collaborate.","description_format":"text","description_chars":5462,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Equity","Gym membership","Health insurance","Hybrid work"],"hiring_locations":[{"name":"United Kingdom","iso":"GB","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["AI Governance & Compliance"],"lifecycle":[{"event":"open","at":"2026-10-26T13:44:07Z"}],"visa":[],"liveness":{"score":90,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.903,"p_room":1,"age_days":3,"expected_fill_days":59,"reasons":["conf:2","velocity","win:early"],"computed_at":"2026-10-30T05:48:23Z"},"pay":null,"html_url":"https://alion.io/job/valarian-senior-data-engineer-ontology-knowledge-graphs","json_url":"https://alion.io/job/valarian-senior-data-engineer-ontology-knowledge-graphs.json","meta":{"generated_at":"2026-10-30T07:36:27Z","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":10668,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-31T00:00:00Z"}},"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":690001},"rest":"https://alion.io/mcp/rest/get_company?id=690001"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fvalarian-senior-data-engineer-ontology-knowledge-graphs"},{"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%2Fvalarian-senior-data-engineer-ontology-knowledge-graphs"},{"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%2Fvalarian-senior-data-engineer-ontology-knowledge-graphs"},{"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/valarian-senior-data-engineer-ontology-knowledge-graphs\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fvalarian-senior-data-engineer-ontology-knowledge-graphs"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":3274707}},{"tool":"search_jobs","arguments":{"company":"valarian.com","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":3274707},"note":"people open to offers who fit this vacancy"}],"note":"The same data through MCP tools: https://alion.io/mcp/open needs no sign-in (compact searches, postings, people); https://alion.io/mcp with an Alion account has everything. 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