{"id":2113082,"url":"https://alion.io/job/link-group-sql-developer-2","title":"SQL Developer","company":{"id":3913591,"name":"Link Group","domain":"linkgroup.pl","url":"https://alion.io/company/link-group-2","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":null,"truth_index":null},"role":"Data Science","role_family":"Data Science","seniority":"middle","employment_type":"contractor","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Poland"],"countries":["PL"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":14500,"max":18000,"currency":"PLN","period":"month","gross":null,"usd_annual":55260},"salary_estimate":null,"experience_years_min":3,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AWS","optional":false},{"name":"ETL/ELT","optional":false},{"name":"PowerShell","optional":false},{"name":"Python","optional":false},{"name":"SQL","optional":false},{"name":"Airflow","optional":true},{"name":"Azure","optional":true},{"name":"GCP","optional":true},{"name":"Google BigQuery","optional":true},{"name":"MySQL","optional":true},{"name":"Oracle","optional":true},{"name":"PostgreSQL","optional":true},{"name":"Snowflake","optional":true},{"name":"SSIS","optional":true},{"name":"Talend","optional":true}],"status":"live","first_seen_at":"2026-09-16T22:00:49Z","employer_posted_date":null,"last_verified_at":"2026-09-16T22:00:49Z","board_verified":false,"closed_at":null,"days_open":44,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":44},"description":"At Link Group, we build tech teams for Fortune 500 companies and the world’s most innovative startups. Our mission is to connect skilled professionals with opportunities that match their expertise, interests, and career aspirations.\n\nAbout the Project\nThe project focuses on data processing and optimization within the finance/stock exchange industry. You will be responsible for developing, managing, and optimizing SQL databases and ETL processes to support business-critical applications.\n\nTech Stack\n\nDatabases: SQL Server, PostgreSQL, MySQL, Oracle\n\nETL Tools: SSIS, Talend, Apache Airflow\n\nCloud Platforms: AWS, GCP, Azure\n\nScripting: Python, Shell, PowerShell\n\nWhat We Offer\n\nTailored opportunities to match your professional interests and goals.\n\nA dynamic and collaborative work environment.\n\nAccess to exciting and diverse projects for global clients.\n\nCompetitive compensation aligned with your expectations.\n\nOngoing opportunities for professional growth and development.\n\nIf you're ready to take on new challenges and work on groundbreaking projects in the IT industry, we'd love to hear from you!\n\nApply today and join us at Link Group to make an impact!\nZakres obowiązków\nDevelop and optimize SQL queries, stored procedures, and database functions\nDesign and maintain data models, schemas, and indexing strategies\nImplement and manage ETL pipelines for data extraction, transformation, and loading\nEnsure database performance, integrity, and security\nWork closely with BI, analytics, and data engineering teams to support business needs\nWymagania\nMust-Have Qualifications\n\nAt least 3+ years of experience as an SQL Developer\n\nStrong SQL programming and database management skills\n\nExperience with ETL processes and data modeling\n\nKnowledge of performance tuning, indexing, and query optimization\n\nGood command of English\n\nNice to Have\n\nExperience with cloud-based databases (AWS RDS, Google BigQuery, Snowflake)\n\nFamiliarity with NoSQL databases\n\nScripting experience in Python, Shell, or PowerShell\n\nTech stack\nSQL\nETL\nAWS RDS\nGoogle 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