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Mmaphefo Seseni

@mmaphefoseseni

Data engineer and analyst translating raw data into actionable insights via end-to-end pipelines and executive dashboards.

South Africa

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What I'm looking for

I’m looking for a role where I can own end-to-end data pipelines and deliver reliable, executive-ready dashboards—turning messy data into actionable insights, improving performance, and streamlining tooling for cost and speed.

I’m a Data Engineer and Analyst with 5+ years of experience building end-to-end data pipelines and delivering executive-facing dashboards. I translate raw, multi-source data into stakeholder-ready insights—spanning pipeline architecture through visualisations—using Python, SQL, dbt, BigQuery, Azure, and Power BI.

Most recently, I designed and deployed 50+ ELT pipelines across multiple clients, ingesting data from systems like Cin7Core and Lightspeed into centralised data warehouses. I also migrated pipeline tooling from Make.com to Fivetran to Airbyte, independently configuring each stack and estimating a 60–70% reduction in pipeline setup time, while maintaining interactive Looker and Power BI dashboards and optimising ETL performance as volumes grew. Earlier, as a Data Analyst at Corruption Watch, I built 20+ Power BI dashboards for executive and investigative teams, cleaned complex datasets with Python and Excel, and authored narrative analyses for non-technical stakeholders.

Experience

Work history, roles, and key accomplishments

Current

Data Engineer

Current

Creative CFO

Aug 2024 - Present (1 year 10 months)

Designed and deployed 50+ ELT pipelines ingesting Cin7Core and Lightspeed data into centralized warehouses, processing millions of records (including a single sales pipeline handling 2M+ rows). Migrated pipeline tooling Make.com → Fivetran → Airbyte and maintained Looker/Power BI dashboards while optimizing ETL performance for reliability and real-time unified views.

ETL Airbyte Fivetran DBT Python SQL BigQuery Azure Data Factory Looker Power BI

Data Analyst

Corruption Watch

Jan 2022 - Aug 2024 (2 years 7 months)

Built and maintained 20+ Power BI dashboards used by executives and investigators to identify geographic hotspots and prioritize corruption investigations. Ingested and cleaned multi-source data (including public submissions and partner PDF reports) using Python/pandas and Excel, and authored narrative analyses for non-technical stakeholders.

Power BI Python (Pandas)Data Cleaning Excel Data Integration Narrative Analysis SQL data transformation Dashboard And Reports

BI Developer

Global Computing & Telecoms

Jul 2021 - Dec 2021 (5 months)

Migrated legacy SQL Server databases to SQL Server 2016/2019, improving system stability and query performance. Developed Power BI reports with data transformation, cleaning, and mapping to enhance data quality and business visibility.

Power BI SQL Server T SQL data transformation Data Cleaning Data Mapping BI Reporting Data Quality

Data Scientist

Explore Data Science Academy

Jan 2019 - Dec 2019 (11 months)

Delivered end-to-end data projects including data cleaning, statistical analysis, SQL, ML modeling (regression/classification), NLP, and Power BI reporting. Built models for Kaggle House Prices regression and used unsupervised learning to analyze City of Johannesburg gantry traffic, producing a Power BI report for Cape Town water supply vs demand during the water crisis.

Machine Learning regression Classification NLP Unsupervised Learning SQL Statistical Analysis Power BI

Data Management

Telkom

Sep 2019 - Nov 2019 (2 months)

Performed exploratory analysis in Python (Jupyter) and cleaned large datasets in BigQuery using T-SQL to identify customer churn patterns across Fixed Broadband, Fibre, and Mobile/LTE products. Built a customer churn prediction model and delivered a Power BI dashboard summarizing weekly trends and stakeholder insights.

Jupyter BigQuery T SQL Data Cleaning Churn Modeling Machine Learning Power BI SQL

Education

Degrees, certifications, and relevant coursework

Tshwane University of Technology

Advanced Diploma, Computer Science

2023 -

Advanced Diploma in Computer Science at Tshwane University of Technology starting in 2023. The program is currently in progress.

Tshwane University of Technology

National Diploma, Engineering (Computer Systems)

2016 - 2022

National Diploma in Engineering (Computer Systems) at Tshwane University of Technology from 2016 to 2022.

Lean Six Sigma Master's Program

Lean Six Sigma Master's Program, Lean Six Sigma

2021 -

Completed a Lean Six Sigma Master's Program in 2021.

Explore Data Science Academy

National Certificate, Systems Development

2019 -

Completed a National Certificate in Systems Development at Explore Data Science Academy in 2019.

College of DuPage

Certificate: Electro-Mechanical Technology, Electro-Mechanical Technology

2021 -

Completed Lean Six Sigma Green Belt 2.0 and earned a Certificate in Electro-Mechanical Technology in 2021 under a U.S. Department of State scholarship.