• We need someone who understands data deeply and uses Python to wrangle it — not a platform engineer, not a pure pipeline builder, but a data specialist who's comfortable with research, investigation, and the unglamorous work of making messy energy market data actually usable. • You'll spend significant time on tasks like: mapping BM units to power plants and fuel types, reconciling legacy data formats with current ones, ensuring consistency between different Elexon message types, and cleaning time-series data (outliers, gaps, overlaps). Some of this requires genuine investigation — cross-referencing sources, making judgment calls, documenting edge cases. There's no API that solves these problems for you. • Python is your primary tool (Pandas, Numpy, standard libraries) to minimise manual effort, but you should be comfortable that some detective work is unavoidable. If you find satisfaction in truly understanding a dataset's structure and quirks — rather than just piping data through and hoping for the best — this role is for you. **Data Mapping and Research** • Map BM units from Elexon to their corresponding power plants, substations, and fuel types — combining API data, public registers, and manual research • Map substations to ETYS zones and grid supply points • Build and maintain reference/master datasets that link identifiers across disparate sources (Elexon, National Grid ESO, TEC register, etc.) • Document mappings, assumptions, and known limitations clearly for downstream users **Data Reconciliation and Consistency** • Reconcile legacy data formats with current formats (e.g., historical operational data stored in different schemas or granularities) • Ensure consistency between different Elexon message types — understand the market data structure well enough to know why BOALF, BOD, and DISBSAD might not perfectly align and how to handle it • Investigate discrepancies between data sources and determine authoritative values **Data Cleaning and Quality** • Clean time-series data: detect outliers (price spikes, meter errors), fill gaps appropriately, resolve overlapping or duplicate timestamps • Develop reusable Python-based cleaning routines that can be applied across datasets • Understand why data quality issues occur (settlement reruns, late submissions, format changes) not just patch them **Pipeline Development (Supporting the Above)** • Write and maintain Python data grabbers for energy market APIs • Build dbt models to transform raw data into clean, analysis-ready datasets • Orchestrate workflows via GitHub Actions • Design PostgreSQL schemas that reflect your understanding of the domain

• Map BM units from Elexon to their corresponding power plants, substations, and fuel types — combining API data, public registers, and manual research • Map substations to ETYS zones and grid supply points • Build and maintain reference/master datasets that link identifiers across disparate sources (Elexon, National Grid ESO, TEC register, etc.) • Document mappings, assumptions, and known limitations clearly for downstream users • Reconcile legacy data formats with current formats (e.g., historical operational data stored in different schemas or granularities) • Ensure consistency between different Elexon message types — understand the market data structure well enough to know why BOALF, BOD, and DISBSAD might not perfectly align and how to handle it • Investigate discrepancies between data sources and determine authoritative values • Clean time-series data: detect outliers (price spikes, meter errors), fill gaps appropriately, resolve overlapping or duplicate timestamps • Develop reusable Python-based cleaning routines that can be applied across datasets • Write and maintain Python data grabbers for energy market APIs • Build dbt models to transform raw data into clean, analysis-ready datasets • Orchestrate workflows via GitHub Actions • Design PostgreSQL schemas that reflect your understanding of the domain

• Lead field crews in performing battery storage system work safely, efficiently, and in accordance with CES’s code of conduct. • Perform and support installations, commissioning, troubleshooting, and repairs of battery energy storage systems. • Conduct system checks, collect data, and adjust settings on computerized equipment. • Follow standard operating procedures and supervisor direction; stop and seek clarification anytime a task appears unsafe. • Adhere to all lockout/tagout procedures. • Prepare detailed documentation—including photos—on all work performed, issues encountered, parts used, suspected root causes, and site conditions. • Foster a culture where every team member feels empowered to stop work when the sequence or conditions are unclear or unsafe. • Perform quality assurance inspections on newly onboarded BESS sites. • Support continuous improvement initiatives and help identify opportunities where CES can elevate its quality and efficiency. • Maintain excellent housekeeping standards at all times. • Perform other duties as assigned.

• Promote a strong safety culture by participating in toolbox talks, behavioral observations, and adherence to all safety standards and best practices. • Perform routine maintenance, troubleshooting, and repair on mechanical and electrical solar plant components. • Review system data and adjust settings on computerized/monitoring equipment at solar facilities. • Follow standard operating procedures and supervisor direction; stop and seek clarification anytime a task appears unsafe. • Adhere to all lockout/tagout procedures and never interfere with another worker’s lockout/tagout device. • Prepare detailed work order documentation—including photos—covering work performed, challenges encountered, parts used, suspected root causes, and site conditions. • Documentation is completed through daily reports and other CES project management tools. • Foster a stop-work culture where all team members feel empowered to halt work if they are uncomfortable with the task or sequence of operations. • Perform quality assurance inspections on newly onboarded solar sites and prepare reports identifying deviations from design drawings, electrical codes, or industry best practices. • Maintain excellent housekeeping standards at all times. • Perform other duties as assigned.