Exploratory Data Analysis
Digging into messy, real-world datasets with SQL — CTEs, window functions, and aggregations — to find the patterns behind the numbers.
Open to Data · Business · Operations Analyst roles
Business instinct, backed by data.
I turn sales, operational, and customer data into insights leadership can act on — pairing 8 years of frontline experience at Apple & Microsoft with hands-on SQL and BI.
CR
Christian Reyes
Data Analyst · St. Cloud, FL
Available
+20%sales lift
SQL · BIend-to-end
Experience & credentials
Apple
Microsoft
Google Data Analytics
DataCamp SQL Associate
What I do
From raw data to decisions leadership trusts.
A focused toolkit built in high-performance retail and operations — designed to surface what's working, what isn't, and what to do next.
KPI Design & Tracking
Defining the metrics that actually move the business and building frameworks to track sales performance and operational efficiency over time.
BI Dashboards
End-to-end Power BI dashboards with DAX measures, trend lines, and clear KPIs — reporting stakeholders can read in seconds.
Customer Behavior Analysis
Connecting customer, billing, and product data to understand churn, adoption, and lifetime value — and where to intervene.
Data Validation & Reporting
Reconciliation, integrity checks, and automated reporting so the numbers leadership sees are numbers they can rely on.
Stakeholder Reporting
Translating analysis into a story cross-functional teams and leadership can act on — without needing a data background.
The stack behind the work.
Hands-on, day-to-day tools — not a wish-list. Built and refined across retail operations, finance, and healthcare analytics projects.
SQL
MySQL
Power BI
DAX
Excel
Office 365
CTEs & Window Functions
Data Validation
Process Improvement
Cross-functional Collaboration
Selected work
Projects, not just dashboards.
SaaS · Retention01
Churn EDA: Improving SaaS Plan Retention
Analyzed subscription churn across plan types, billing cycles, and company sizes — surfacing that Starter, monthly-billing users churn fastest, and proposing a targeted promotional fix.
3churn drivers found
1retention play proposed
MySQLCTEsWindow Functions
View on GitHub
Healthcare · Finance02
Hospital Billing & Insurance Claim Analysis
Joined billing and claims data to test whether patients were fully reimbursed — surfacing a gap of unclaimed procedures and proposing automated reconciliation to recover revenue.
Gapunclaimed revenue found
Autoreconciliation proposed
MySQLSQL JoinsAggregations
View on GitHub
Healthcare · BI Dashboard03
Healthcare Financial Analytics Dashboard
An end-to-end MySQL & Power BI build analyzing revenue cycles, profit margins, denial rates, and reimbursement timelines — delivered as an interactive dashboard with KPIs and trend lines leadership can explore.
4revenue KPIs tracked
E2Edata → dashboard
DAXmeasure layer
MySQLPower BIDAX
View on GitHub
Tools · SQL Practice04
Interactive SQL Practice Lab — 3 Roles, 90 Problems
A browser-based SQL practice environment with three real-world schemas — Clinical Ops, Financial Analysis, and Marketing — and 90 problems spanning SELECT basics to window functions. Built with Claude AI.
90problems
3role schemas
SQLSQLitesql.js
Try the lab
About
Eight years reading the room — now reading the data.
I bring a rare combination of hands-on experience at Apple and Microsoft and technical SQL and BI skills — turning sales, operational, and customer data into insights that leadership can actually act on.
Across 8+ years in high-performance environments I built KPI frameworks, analyzed customer behavior, and drove real revenue outcomes — including a 10% increase in service adoption and a 20% lift in sales. I'm based in St. Cloud, FL and open to Data, Business, and Operations Analyst roles.
Google Data Analytics — Professional CertificateIssued Mar 2023 · Verify credential J2TDKJTYTXRJ →
DataCamp — SQL AssociateIssued Apr 2025 · SQA0015417793938
0years of frontline experience
0increase in sales driven
0lift in service adoption
0SQL problems authored
Where I've sharpened it.
High-performance retail and operations at Apple & Microsoft — environments where data had to drive decisions in real time, not in a quarterly report.
Sales Performance
Operational Efficiency
Customer Insight
Revenue Reporting
Let's talk
Have data that should be telling you more?
I'm open to Data, Business, and Operations Analyst roles — and always happy to talk through a problem. Reach out and I'll get back to you quickly.