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Data Specialist (Remote/Hybrid) at Alex Staff Agency. About the company and the project:. An international company, a leader in developing large-scale energy storage and grid-stability technologies, is in search of a highly skilled and experienced . Data Specialist.  to be a part of its core team.. The company has been operating since 2006 and is currently expanding its portfolio of commercial power plants. The successful candidate will contribute to . the fastest-growing direction. , integrating advanced software with physical energy infrastructure.. The company has . offices in London, Dubai, and India. .. You are offered a . completely remote.  form of collaboration or . a hybrid work model in London. .. Your tasks on the position:. Mapping BM units, substations, and fuel types across Elexon, National Grid, and other sources; maintaining master/reference datasets. Documenting mappings, assumptions, and known limitations clearly for downstream users. Reconciling legacy and current data formats; ensuring consistency between Elexon message types. Investigating discrepancies between data sources to determine authoritative values. Cleaning time-series data: detecting outliers, filling gaps, resolving duplicates, and understanding root causes of quality issues. Developing reusable Python-based cleaning routines and data grabbers for APIs. Building dbt models and designing PostgreSQL schemas for clean, analysis-ready datasets. Orchestrating workflows using GitHub Actions. 3+ years of experience as a Data Engineer. Strong Python programming skills (especially for API data ingestion and ETL). Advanced SQL and data modeling experience with PostgreSQL. Experience with messy, real-world data. English B2+. Will be a plus:. Experience with energy, utilities, or market data. Familiarity with UK energy markets, Elexon data, or grid operations. dbt experience for transformation pipelines. Exposure to time-series data challenges (irregular timestamps, gaps, restatements). Company Location: Greece.