The work behind
the portfolio.

Excel Skills Job Simulation

• Reviewed and organized account sales data, using conditional formatting to surface data-quality issues and meaningful patterns.
• Applied SUM, AVERAGE, IF, COUNTIF, SUMIF, and IFERROR to calculate, summarize, and classify sales information.
• Built PivotTables and charts to examine account performance and annual sales trends, then brought key metrics together in an Excel dashboard.
• Recorded and tested VBA sorting macros, assigning them to Form Control buttons to make repeatable workbook operations easier to run.

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Data Labeling Analyst — Job Simulation

• Reviewed simulated customer-support messages and classified intent, sentiment, and personally identifiable information (PII) using a consistent labeling schema.
• Evaluated ambiguous edge cases and documented concise rationales for final labeling decisions.
• Reviewed peer labeling, identified inconsistencies, and proposed an improvement to the team's labeling guidelines.
• Applied clear definitions and privacy-aware practices to support consistent, reliable labeled data.
• Practiced human–AI collaboration concepts relevant to AI operations, trust and safety, and machine-learning data support.

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Machine Learning Engineer Intern

• Queried an approximately 79-million-row search-performance warehouse with DuckDB and SQL, aggregating Parquet data for analysis.
• Developed Python-based feature-preparation workflows and machine-learning experiments using anonymized search-performance data.
• Explored temporal and client-grouped validation approaches to assess model generalization and identify potential data-leakage risks.
• Completed a capstone project that was independently reviewed and approved.

Freelance BI Developer

• Deliver confidential BI engagements, translating business questions into Power BI reports, KPI definitions, semantic models, and DAX measures.
• Shape source data with Power Query and SQL, and document metric definitions, transformation logic, and reporting handover.

Freelancing Coach

• Coached aspiring freelancers on professional positioning, portfolio and CV development, freelance-platform profiles, proposal writing, and client communication.
• Reviewed learner portfolios, CVs, and freelance profiles, providing practical feedback and structured weekly development challenges.
• Analyzed freelance project listings to identify recurring skill requirements and help learners position practical services.

Data Analysis Mentor

• Mentored learners in Excel formulas and functions, data cleaning, PivotTables, charts, dashboards, Power Query, Power Pivot, and DAX.
• Taught data transformation with Power Query and data modeling with Power Pivot, including DAX calculations in Excel’s Data Model.
• Designed practical exercises and reviewed learner work to strengthen analytical reporting and dashboard skills.