Internal Audit & Analytics Portfolio

Colby Kellersberger, CIA, CFE, CICA

Audit Analytics

Risk-focused analytics and applications designed to improve audit coverage, identify anomalies, and support data-driven audit decisions.

Power BI DAX Python Streamlit Statistical Testing

Power BI Dashboards

Vendor Payments Monitoring

Power BI • Risk analytics

Problem
High-volume vendor payments make it difficult to identify duplicate, split, or unusual transactions.

Approach
Built a risk-focused dashboard highlighting payment patterns, vendor behavior, and anomalies for targeted testing.

Audit value
Enables focused audit testing and continuous monitoring of high-risk transactions.

Internal Audit Issue Tracker

Power BI • Issue management

Problem
Tracking open issues and management action plans across audits can be fragmented and manual.

Approach
Centralized issue tracking with status, aging, and ownership views.

Audit value
Improves follow-up discipline and management reporting.

Adventure Works – Sales & Operations Dashboard

Power BI • Data modeling • Operational analytics

Purpose
Demonstrate end-to-end dashboard development using a multi-table operational dataset, with a focus on metrics commonly reviewed by management and internal audit.

Approach
Modeled sales, product, and operational data into a star schema and built interactive visuals to analyze revenue trends, product performance, and operational drivers.

Analytical value
Illustrates how transactional data can be transformed into decision-support insights and used to identify unusual trends, margin pressure, or performance anomalies.

Property Management Dashboard

Power BI • Portfolio analysis • Management reporting

Purpose
Provide a consolidated view of property-level performance metrics commonly used by property management and oversight teams.

Approach
Built a dashboard to filter and segment properties based on operational and financial criteria, enabling targeted review of underperforming or higher-risk locations.

Analytical value
Supports portfolio oversight by highlighting outliers, trends, and performance variances that may warrant further review or investigation.


Python Audit Apps (Streamlit)

Audit Sampling Tool

Python • Streamlit • Statistical sampling

Problem
Manual sampling is time-consuming and difficult to reproduce consistently.

Approach
Built an interactive sampling app with filtering, random selection, and exportable results.

Audit value
Reproducible, defensible samples for audit testing.

Open app

Audit sampling app screenshot

Benford’s Law Audit Tool

Python • Streamlit • Fraud analytics

Problem
Large numeric datasets make it difficult to identify potential manipulation or anomalies.

Approach
Implemented Benford’s Law analysis with visual diagnostics and anomaly flagging.

Audit value
Rapid triage of high-risk datasets for further investigation.

Open app GitHub repo

Benford’s Law app screenshot

Fair Lending Analysis

Python • Streamlit • Statistical testing

Problem
Fair lending risk requires testing pricing and underwriting outcomes across borrower groups.

Approach
Built a simulator using synthetic data, interactive controls, and statistical analysis.

Audit value
Demonstrates potential disparate impact and supports compliance testing.

Open app

Fair lending app screenshot