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Mariska Oosthuizen

@mariskaoosthuizen

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Analytics engineer turning fragmented data into trusted executive insights.

South Africa

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What I'm looking for

I seek hybrid/remote analytics roles where I can build governable, high-performance data models and executive BI, collaborate with engineers and stakeholders, and mentor teams while improving data reliability and decision-making.

I am an analytics engineer and consultant with over eight years’ experience delivering business intelligence and analytics solutions that turn complex, fragmented data into clear, trusted insight.

I design analytics-ready data models (Gold/Silver layers) and build semantic Power BI models with DAX, KPIs, and drill-through capabilities to enable executive and operational decision-making.

My work emphasises governance, repeatability, and performance: I author SQL query standards and SOPs, use Azure DevOps for version-controlled delivery, and optimise refresh and partition strategies for efficient analytics.

I collaborate closely with stakeholders and data engineers, mentor junior analysts, and have delivered solutions across Databricks SQL, Azure Synapse, SQL Server, Snowflake, Qlik and Power BI for clients in mining, retail, FMCG, insurance and agriculture.

Experience

Work history, roles, and key accomplishments

Current

Analytics Engineer

Current

First Quantum Minerals

Oct 2024 - Present (1 year 3 months)

Designed and delivered Gold-layer analytical datasets in Databricks SQL and built/optimized Power BI semantic models and dashboards, improving analytics reliability and enabling executive insights; authored SQL standards and mentored junior analysts.

Databricks Power BI DAX Data Modelling REST APIs Incremental Refresh Azure DevOps

Data Consultant

Self Employed

Oct 2024 - Feb 2025 (4 months)

Delivered bespoke analytics solutions (Power BI, Qlik Sense) and database builds for clients including Quantum Gaming and FMCG retailers, implementing data connections, ETL patterns, and executive reporting to support segmentation and management insights.

Power BI Qlik Snowflake Azure Synapse SQL Supabase Python

BI Analyst

Fruitways

Dec 2022 - Sep 2024 (1 year 9 months)

Developed Power BI reports and semantic models connected to SQL Server and MySQL, supporting a database migration and improving reporting consistency and operational decision-making across marketing, packhouse, and farming functions.

Power BI DAX Power Query SQL Server MySQL SQL Optimization Data Migration Reporting

Data Analyst

Ceres Fruit Growers

Feb 2021 - Nov 2022 (1 year 9 months)

Maintained SQL-based transformations and SSIS workflows, modernized legacy reporting by migrating Crystal Reports to SSRS and Power BI, and ensured data consistency through validation and controlled transformation logic.

SQL SSIS Crystal Reports Data Validation ETL Power BI

Power BI / Data Analyst

Upwork

May 2020 - Jan 2021 (8 months)

Built custom Power BI dashboards for international clients focused on KPI tracking and performance analysis, and authored technical articles on Power BI and data modelling.