Internal Audit & Analytics Portfolio

Colby Kellersberger, CIA, CFE, CICA

Internal Audit Manager (CIA, CFE, CICA)

I build practical audit tools and analytics that reduce manual testing, standardize documentation, and surface risk faster.

Excel / VBA Ribbon XML Power BI (DAX / Modeling) Python (pandas) SQL Streamlit
Audit tooling
Repeatable templates + add-ins
Analytics
Risk-based testing + dashboards
Automation
Faster fieldwork + cleaner review

Excel Audit Tools

Tickmark Excel Add-In

Excel .xlam • VBA • Ribbon XML

Problem
Inconsistent audit notation and time spent inserting tickmarks/legends across workpapers.

Approach
Custom add-in with one-click tickmarks, legends, and reference templates for standardized documentation.

Audit value
Faster workpaper prep, improved consistency, and smoother review.

View walkthrough Excel tools page

Tickmark add-in screenshot

Ribbon-based tickmarks and audit documentation helpers.

Risk Assessment Matrix (Excel Template)

Excel • Scoring model • Heatmap visualization

Problem
Risk scoring is often inconsistent across audits and hard to communicate succinctly.

Approach
Configurable risk factors and scoring with an at-a-glance heatmap to highlight high-risk areas.

Audit value
More consistent prioritization and clearer risk communication.

View details + download Excel tools page

Risk assessment matrix screenshot

Configurable factors with a heatmap summary.


AI-Enabled Audit Documentation

I designed a governed AI assistant to support internal auditors with audit documentation while enforcing methodology, sampling rules, and documentation discipline.

Unlike generic AI tools, this assistant operates within strict guardrails: it requires explicit activity selection (Narrative, Walkthrough, Test Plan, Testing Results, or Issue), prevents fabrication, and embeds approved sampling guidance directly into its behavior.

View AI assistant overview


Audit Analytics

Dashboards, monitoring, and testing apps

Power BI • Python • Streamlit
  • Vendor payments monitoring (duplicate/split payments, unusual vendors)
  • Issue tracking dashboards for audit follow-up
  • Sampling and Benford’s Law analysis apps
  • Fair lending pricing/underwriting simulator

Explore audit analytics


SQL & Data Projects

SQL + BI case studies

SQL • Power BI
  • Data job market skills and pay
  • Sales performance and profitability

View SQL projects


About & Contact

I’m an Internal Audit Manager focused on risk-based auditing and building tools that make testing more efficient, consistent, and repeatable in complex environments.

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