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SELECT * FROM XML
SQL
LEFT JOIN SPED
def audit(xml):
import pandas as pd
VBA Advanced
ICMS
Difal / FCP
PIS/COFINS
Sub Macro()
CALCULATE()
FILTER(ALL)
POWER BI
IBS / CBS
LC 214/2025
Tax Tech Portfolio

DARLAN SANDRO

Data, Code, and AI to simplify tax complexity

Tax Management Specialist | Analytics | SQL • Python • Power BI | Law & Applied AI
View Projects My Journey

IBS/CBS Simulator

Tax Reform Projection (LC 214/2025)

Companies that trust my consultancy

/ Recommendations

“

"His profile is marked by a focus on tax efficiency, process automation, and fiscal intelligence, mastering tools like Advanced Excel, Power BI, SQL, VBA, and Python. [...] Professionals like him add real value to businesses and make a difference in any team."

E

Eugênio Souza

Division Chief Financial Officer (CFO)

“

"Darlan Sandro exposed me to the Information Technology field from a very early age. His guidance and support helped me build a strong foundation in programming logic, data structures, and algorithmic thinking. He is an exceptional professional."

U

Umberto Bitencourt

Ph.D Candidate @ Univ. of Minnesota

01. About Me

Data Analyst with 15 years of experience in Accounting and Tax Governance, operating at the intersection of Accounting, Law, and Technology (Tax Tech). Experienced in applying Data Analytics to strengthen compliance frameworks, audit financial processes, recover tax credits, and mitigate regulatory risks in complex environments, including large-scale tax reforms.

Recognized for leading digital transformation initiatives within tax and finance departments, combining regulatory expertise (currently pursuing a Law degree with a focus on Tax Law) with advanced proficiency in Power BI, SQL, and Python. Skilled in developing Business Intelligence solutions that enhance governance structures, improve reporting accuracy, and increase operational efficiency.

Technologies I master:

  • â–¹ Power BI (DAX/RLS)
  • â–¹ Python (Pandas/ETL)
  • â–¹ SQL Server
  • â–¹ SAP / Fiscal ERPs
  • â–¹ VBA / Automation
  • â–¹ Fiscal Compliance
Darlan Sandro

02. TaxTech Projects

Practical solutions in Data Analytics, Python Automation, and Fiscal Dashboards for high-volume data.

View all Projects
iFood Marketing Analytics Dashboard

Enlighten Data Story: iFood

A scientific approach to A/B Testing. Using Python for data preparation and Power BI DAX to calculate statistical significance and prevent marketing budget waste.

  • Python
  • Power BI
  • A/B Testing
Credit Risk Audit

Credit Risk Audit

Transactional audit of 169,000 contracts to fix a BRL 130M structural deficit and propose Risk-Based Pricing policies.

  • Power BI
  • DAX
  • Python
  • Credit Risk
Cash Insurance: AI Applied to Pricing and Actuarial Risk

Cash Insurance: AI Pricing & Actuarial Risk

Predictive AI engine (K‑Means) to eliminate cross‑subsidization and hit a strict 75% target loss ratio via Power BI.

  • Power BI
  • Python
  • Machine Learning
Bank Churn Prediction with AI

Bank Churn Prediction

Random Forest predictive model in Python structured into a Power BI dashboard to mitigate bank churn and protect estimated revenue.

  • Python & ML
  • Power BI
  • Finance
Customer Segmentation and Hidden Liability

Segmentation & Churn

Application of Artificial Intelligence (K-Means) on a 45,000-student base to identify hidden liabilities and optimize retention actions.

  • Python
  • Machine Learning
  • Power BI
  • DAX
ETL Fiscal

Reconciliation ETL

Automated SPED vs XML cross-referencing with 100% accuracy, reducing monthly closing time by 10 business days.

  • Power Query
  • M Language
  • SQL

/ Interactive Data Hub

Don't just take my word for it. Experience my technical skills in action. Interact directly with this real **Tax Intelligence Dashboard**. Click the filters to slice the data and visualize insights dynamically.

Fully Interactive Live Power BI Embed Public Data Source

03. Insights & Publications

Thoughts on the convergence of Tax Reform, Artificial Intelligence, and the future of Accounting.

View all Articles
Data Engineering

The Tracker Ecosystem

How integrating accounting, legal, and tech perspectives bridges the gap between physical inventory and ERP data.

Read article
SQL & Data

The Ultimate Guide: How to Import Excel Data into SQL Server

Learn how to fix driver errors and turn Excel imports into a smooth process using T-SQL and the OPENROWSET function.

Read article
Power BI & Data

Is Your Power BI Slowing You Down?

Discover how centralizing your data with a Shared Semantic Model can boost performance and reduce database load.

Read article

04. Experience

Tax Governance & Tax Tech Consultant @ Self-Employed

2023 – Present

Provide strategic consulting services focused on tax restructuring, compliance optimization, and Business Intelligence implementation in corporate tax departments.

  • Achieved up to 20% tax savings through strategic tax classification review and regulatory alignment.
  • Reduced operational rework by 80% by automating tax processes using SQL and VBA.
  • Designed executive dashboards (P&L, Cash Flow, Tax KPIs) to support senior management decisions.
  • Developed Python/SQL simulations to assess cash flow impacts under new tax frameworks.

Senior SQL & Data Specialist @ Hashtag Treinamentos

2025 – Present

Strategic technical support in SQL Server and Power BI for advanced corporate data modeling scenarios.

  • Solved complex data performance and modeling challenges.
  • Delivered scalable BI solutions aligned with real-world business cases.
  • Translated technical requirements into optimized database queries and reporting structures.

Senior Accountant & Tax Manager @ Gestcontábil

2008 – 2022

Led accounting and tax operations for companies under Real and Presumed Profit regimes.

  • Managed full tax compliance and regulatory reporting.
  • Implemented digital auditing and tax automation processes.
  • Supported executive leadership in financial and tax decision-making.
  • Interpreted tax legislation and conducted administrative tax defense procedures.

Administrative & Financial Manager @ Rede Erguer Passos Construções

2000 – 2008

  • Led 60% growth in fixed assets over 7 years through structured financial planning.
  • Implemented financial governance frameworks and management reporting systems.
  • Strengthened internal controls and budget planning processes.

University Lecturer – Accounting @ Faculdade Dom Luiz

2009

  • Taught Tax Accounting, Managerial Accounting, and Auditing.
  • Delivered technical education and professional training.

05. Education

Postgraduate Degree in Data Analytics & Applied Artificial Intelligence for Business

FNAT

In Progress

Bachelor of Laws (LL.B.)

Centro Universitário Ages

In Progress – Expected 2028

Postgraduate Degree in Tax Management

Faculdade Visconde de Cairu

2014

MBA in Digital Accounting

Faculdade Pitágoras

2012

Bachelor’s Degree in Accounting

Faculdade Dom Luiz

2010

Shall we talk?

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