Open to opportunities

Esther Bisiriyu

@estherbisiriyu

Message

Data Analyst and Power BI Developer turning data into KPI-driven business insights.

Nigeria

Message

What I'm looking for

I’m looking for a remote-friendly role where I can build KPI dashboards and scalable data models using SQL, Power BI, and Python—turning complex data into clear decisions with strong data validation and stakeholder-focused delivery.

I’m a results-driven Data Analyst and Power BI Developer who transforms complex datasets into actionable business intelligence. I work end-to-end with SQL, Power BI (DAX, Power Query), Advanced Excel, and Python to clean, model, and visualize data for decision-makers.

In projects and client work, I’ve built KPI dashboards that track revenue and profitability, modeled and transformed 1M+ rows for faster, consistent reporting, and delivered churn analysis using SQL and Python. I focus on scalable relational models (star/snowflake), strong data validation, and interactive dashboards (drill-through, slicers, bookmarks), and I’m available for remote and international engagements.

Experience

Work history, roles, and key accomplishments

Current

Freelance Data Analyst & Power BI

Current

Self-Employed

Jul 2025 - Present (1 year 1 month)

Designed and delivered KPI dashboards in Power BI and Excel for clients across retail, telecom, HR, and finance sectors. Cleaned and transformed large-scale datasets (1M+ rows) using SQL, Power Query, and Python, and built star-schema data models with advanced DAX measures for executive reporting.

Power BI DAX Power Query SQL Python Excel Data Cleaning data transformation Data Modeling Star Schemas KPI Reporting MOM Stakeholder Management

Current

Cash Officer

Current

Zenith Bank

Feb 2025 - Present (1 year 6 months)

Authorized cash transactions above teller limits and reviewed teller payout thresholds based on error rate assessments. Ensured ATMs remain functional and funded, maintained teller proofs and vault registers, and monitored compliance to maintain a zero-fraud-tolerance standard.

Cash Transaction Authorization Teller Limits Error Rate Assessment ATM Replenishment ATM Funding Monitoring Voucher Call Over Teller Proofs Maintenance Vault Register Maintenance Compliance Monitoring Fraud Prevention Cash Reconciliation

Current

Operations Team Member

Current

Zenith Bank

Jun 2023 - Present (3 years 2 months)

Oversee daily cash flow and vault operations to ensure branch liquidity meets operational requirements. Monitor internal controls and banking regulations, reconcile daily cash positions, and escalate discrepancies promptly.

Cash Flow Management Vault Operations Regulatory Compliance Internal Controls Audit Support

Data Analyst Intern

Tech Studio Academy

May 2025 - Aug 2025 (3 months)

Gained hands-on experience in data analysis and business intelligence across real-world datasets. Worked with Excel, SQL, Power BI, and Python to clean, model, and visualize data across telecom, HR, and e-commerce use cases.

Excel SQL Power BI DAX Power Query Python Data Cleaning Data Modeling Data Visualization

Cash & Teller Officer

Zenith Bank

Jun 2023 - Jan 2025 (1 year 7 months)

Processed high volumes of daily financial transactions with accuracy and strict regulatory compliance. Performed end-of-day cash balancing and transaction reconciliation, resolving discrepancies within set timelines while adhering to internal controls and audit requirements.

High Volume Transaction Reconciliation Regulatory Compliance Internal Controls

Finance Intern

Access ARM Pension

Jun 2022 - Mar 2023 (9 months)

Assisted in preparing financial reports and forecasts using Excel and improved accuracy and efficiency. Prepared journal entries, automated recurring Excel reporting templates, and supported data entry, validation, and audit documentation aligned with internal compliance controls.

Excel Financial Reporting Financial Forecasting Journal Entries Recurring Reporting Data Entry Data Validation Compliance Support