{"id":3798343,"url":"https://alion.io/job/comm-it-middle-data-engineer-data-lakehouse","title":"Middle Data Engineer/ Data Lakehouse","company":{"id":2313062,"name":"Comm-IT","domain":"comm-it.com","url":"https://alion.io/company/comm-it-com","size_band":"11-50","is_staffing_agency":false,"employer_type":"services","is_intermediary":false,"listed_via":null,"ats_vendor":"Comeet","truth_index":{"grade":"B","score":82,"open_postings":11,"ghost_share":0,"stale_share":0.909,"repost_share":0,"time_to_fill_p50_days":20,"computed_at":"2026-11-05T05:54:30Z"}},"role":"Data Science","role_family":"Data Science","seniority":"middle","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"explicit","locations":["Warsaw, Poland"],"countries":["PL"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Amazon S3","optional":false},{"name":"Apache Kafka","optional":false},{"name":"AWS","optional":false},{"name":"Dagster","optional":false},{"name":"Databricks","optional":false},{"name":"GDPR","optional":false},{"name":"Google BigQuery","optional":false},{"name":"Python","optional":false},{"name":"Snowflake","optional":false},{"name":"SQL","optional":false},{"name":"Trino","optional":false}],"status":"live","first_seen_at":"2026-11-05T09:28:13Z","employer_posted_date":"2026-11-05","last_verified_at":"2026-11-05T20:52:31Z","board_verified":true,"closed_at":null,"days_open":0,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":0},"description":"Description\nWe’re looking for a Mid Data Engineer to take ownership of our data lake - the system of record for millions of financial events every day, including bets, wallet transactions, and live odds, serving 12M+ active users. You’ll be responsible for designing and maintaining reliable data pipelines and defining how data is ingested, stored, retained, reconciled, and governed across AWS S3 and Snowflake/Databricks. Your work will ensure that Analytics, Finance, and Regulatory teams have access to accurate, consistent, and fully traceable data - withzero drift from source systems.\nLocation: Kraków, Poland. Hybrid - 2 days per week from the office.\nWhat you will do:\nOwn the lakehouse architecture: bronze/silver/gold layers, Iceberg/Delta tables, schema evolution.\nLand operational data via CDC streaming (Kafka, Debezium), handling late and duplicate events.\nDesign data layout for speed and cost: partitioning, compaction, file sizing, query performance on Trino/Athena/Snowflake.\nOwn retention and archival: storage tiering, regulatory retention, immutability, GDPR deletion.\nGuarantee correctness: freshness SLAs, drift detection, reconciliation against the source wallet and ledger systems.\nOwn governance: catalog and lineage, row/column access control, PII masking, encryption, audit trails.\nMonitor ingestion health, data anomalies, and cloud storage/compute spend.\nRequirements\nMust-have:\n2 years of hands -on in a production lakehouse environment.\nLakehouse architecture - bronze/silver/gold layering, an open table format (Iceberg, Delta, or Hudi), schema evolution.\nData layout & query optimization at TB+ scale - partitioning, compaction, file sizing, query performance on Trino/Athena/Snowflake.\nCloud lakehouse/DWH in production - Snowflake, Databricks, or BigQuery.\nCDC & streaming ingestion - Kafka + Debezium or equivalent; late, duplicate, and out-of-order events.\nStrong SQL and data modeling - enough relational grounding to reason about the OLTP systems you capture from. Critical for financial ledgers.\nCorrectness - freshness SLAs, drift detection, reconciliation against source wallet/ledger systems.\nGovernance - catalogs, lineage, row/column access control, PII masking, retention, GDPR deletion.\nCloud object storage - S3 or GCS, plus storage tiering and archival.\nPython and an orchestrator - Airflow or Dagster, as tools.","description_format":"text","description_chars":2364,"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":[],"hiring_locations":[{"name":"Poland","iso":"PL","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["IT Consulting & Digital Transformation","IT Outsourcing & Dedicated Teams","Custom Software Development","Cloud Consulting & Migration"],"lifecycle":[{"event":"open","at":"2026-11-05T10:24:47Z"}],"visa":[],"liveness":{"score":86,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.86,"p_room":1,"age_days":0,"expected_fill_days":20,"reasons":["conf:3","win:early"],"computed_at":"2026-11-06T00:13:07Z"},"pay":null,"html_url":"https://alion.io/job/comm-it-middle-data-engineer-data-lakehouse","json_url":"https://alion.io/job/comm-it-middle-data-engineer-data-lakehouse.json","meta":{"generated_at":"2026-11-06T00:13:07Z","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":428,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-11-07T00:00:00Z"}},"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":2313062},"rest":"https://alion.io/mcp/rest/get_company?id=2313062"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fcomm-it-middle-data-engineer-data-lakehouse"},{"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%2Fcomm-it-middle-data-engineer-data-lakehouse"},{"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%2Fcomm-it-middle-data-engineer-data-lakehouse"},{"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/comm-it-middle-data-engineer-data-lakehouse\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fcomm-it-middle-data-engineer-data-lakehouse"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":3798343}},{"tool":"search_jobs","arguments":{"company":"comm-it.com","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":3798343},"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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