{"id":3454763,"url":"https://alion.io/job/qualco-data-engineer","title":"Data Engineer","company":{"id":55578,"name":"QUALCO","domain":"qualco.tech","url":"https://alion.io/company/qualco","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Workable","truth_index":{"grade":"A","score":91,"open_postings":14,"ghost_share":0,"stale_share":0.571,"repost_share":0,"time_to_fill_p50_days":21,"computed_at":"2026-11-08T05:47:12Z"}},"role":"Data Science","role_family":"Data Science","seniority":null,"employment_type":null,"work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Athens, Greece"],"countries":["GR"],"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":"Airflow","optional":false},{"name":"Apache NiFi","optional":false},{"name":"dbt","optional":false},{"name":"ETL/ELT","optional":false},{"name":"GDPR","optional":false},{"name":"Git","optional":false},{"name":"Informatica","optional":false},{"name":"Oracle","optional":false},{"name":"PostgreSQL","optional":false},{"name":"Python","optional":false},{"name":"SQL","optional":false},{"name":"SSIS","optional":false},{"name":"Talend","optional":false}],"status":"live","first_seen_at":"2026-10-29T12:36:07Z","employer_posted_date":"2026-10-29","last_verified_at":"2026-11-08T07:08:34Z","board_verified":true,"closed_at":null,"days_open":9,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":9},"description":"At Quento Technologies S.A., the ICT arm of the Qualco Group, we deliver comprehensive and innovative solutions across AI, Digital Engineering, Cloud, and Cybersecurity, helping businesses accelerate digital transformation. With a presence in Greece, Luxembourg, and Belgium, and backed by the expertise of the Qualco Group, we combine deep technical knowledge with strategic partnerships to support business growth.\nAt Quento Technologies S.A. we empower our people to innovate and lead in delivering transformative ICT solutions to our clients worldwide.\nQuento Technologies S.A. seeks a highly motivated and experienced a Data Engineer tobe responsible for the implementation of data ingestion pipelines, preprocessing activities, SQL transformations, reconciliation controls, and associated data processing components.\nYour responsibilities will entail:\nDevelop and configure source ingestion and preprocessing pipelines;\nImplement SQL-based transformations and reconciliation rules;\nBuild reusable data processing components and supporting Python scripts;\nImplement reconciliation results persistence and data validation logic;\nOptimize database queries and pipeline execution;\nSupport integration testing, defect investigation, and reconciliation accuracy validation;\nEnsuring that all activities and duties are carried out in full compliance with regulatory requirements and supporting the continued implementation of the Group Anti-Bribery and Corruption Policy.\nRequirements\nUniversity degree in Computer Science, Engineering, or a related field;\n4+ years of professional experience in Data Engineering, ETL/ELT Development, or Database Development.\nAt least 2-3 years of hands-on experience in comparable enterprise data integration, data processing, or reconciliation projects;\nAdvanced SQL development, including complex joins, CTEs, window functions, aggregations, and performance optimization;\nPython development for file handling, data validation, transformation, and automation;\nHands-on experience in relational data modeling and database schema implementation, including staging tables, transformation models, reference data mappings, and reconciliation result structures;\nDesign and implementation of ETL/ELT pipelines;\nProcessing of structured and semi-structured files, including CSV, delimited, fixed-width, and compressed formats;\nDevelopment of source-to-target mappings, data standardization, and transformation logic;\nImplementation of reconciliation rules, matching algorithms, discrepancy identification, and results persistence;\nIncremental loading, error handling, restartability, and idempotent data processing;\nGit-based development practices and automated testing.\nRelevant Technologies / Experience\nPostgreSQL, Oracle, SQL Server, Python, dbt Core, Apache Airflow, Meltano/Singer, Informatica, Talend, SSIS, Apache NiFi, or equivalent ETL/ELT and database technologies.\nBenefits\nYour Life @ Qualco Group\nOn top of challenging work environment, we are offering:\nCompetitive compensation, ticket restaurant card, and annual bonus programs\nCutting-edge IT equipment, mobile and data plan\nModern facilities, free coffee and beverages, indoor parking, and company bus\nPrivate health insurance, onsite occupational doctor, and workplace counselor\nFlexible working model, hybrid benefits & home equipment benefits\nOnsite gym, wellness facilities, and ping pong room\nCareer and talent development tools\nMentoring, coaching, personalized annual learning and development plan\nEmployee referral bonus, regular wellbeing, ESG and volunteering activities\nYour race, gender identity and expression, age ethnicity or disability make no difference in Quento Technologies S.A. We want to attract, develop, promote, and retain the best people based only on their ability and behavior.\nDisclaimer: Quento Technologies S.A. collects and processes personal data in accordance with the EU General Data Protection Regulation (GDPR). We are bound to use the information provided within your job application for recruitment purposes only and not to share these with any third parties. 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