Hazem Kallini
Verified Expert in Engineering
Data Analyst and Developer
Brant, ON, Canada
Toptal member since October 14, 2019
Hazem is a data professional with nearly 18 years of experience in BI, data analytics, and data visualization. He specializes in BI, SQL, and ETL development, helping businesses turn complex data into clear, actionable insights. Hazem's strength lies in combining deep technical expertise with strong business awareness and emotional intelligence, ensuring seamless collaboration and impactful solutions.
Portfolio
Experience
- SQL - 18 years
- Data Analysis - 15 years
- Microsoft Power BI - 9 years
- Amazon Web Services (AWS) - 5 years
- Snowflake - 5 years
- Scrum - 5 years
- Python - 5 years
- Data Modeling - 4 years
Preferred Environment
Business Intelligence (BI), SQL, Microsoft Power BI, Snowflake, Power BI Desktop, ETL Tools, Microsoft 365, Microsoft Power Platform, Data Analysis, Data Engineering, HIPAA, Social Networks
The most amazing...
...project I've worked on was migrating a legacy marketing data mart to an enterprise data warehouse.
Work Experience
Microsoft Power App Developer
Meter Calibration Solutions LLC d/b/a MCS Petroleum
- Rebuilt a legacy Power Apps field service platform from scratch for MCS Petroleum, migrating away from a brittle Canvas App to a modern code-based React/TypeScript application, handling all architecture decisions and data modeling.
- Leveraged Claude Code and agentic AI throughout the development lifecycle to accelerate sprint delivery.
- Designed and delivered an end-to-end process management application covering the full calibration job lifecycle.
Senior Power BI Developer
Interlace Health, LLC
- Developed and maintained internal and external Power BI reporting artifacts, enabling stakeholders across clinical and operational teams to track performance and drive data-informed decisions.
- Supported reporting platform administration, including access management and capacity planning to ensure reliability and governance across the reporting environment.
- Completed HIPAA compliance training, reinforcing data stewardship practices aligned with healthcare industry regulations.
Data Engineer
Freight Flex, LLC
- Audited and rationalized cloud infrastructure supporting the company's reporting stack, identifying over-provisioned resources driving unnecessary monthly spend.
- Redesigned the Power BI data architecture to operate on a leaner, right-sized back end, eliminating redundant compute and storage without impacting report performance or refresh reliability.
- Delivered recurring savings of several thousand dollars per month while maintaining full reporting fidelity for business stakeholders.
Data Analyst | Data Modeler
Fortune 100 North American Construction Equipment Manufacturer (Toptal Client)
- Built and maintained a common data model using Erwin according to company and industry standards.
- Gathered requirements from dealers and company teams to create and maintain interfaces and other documentation based on those needs.
- Collaborated with the dealer data strategy team, dealers, and developers to define and ensure adherence to change management processes and versioning control.
- Created, maintained, and published release notes for dealer data models.
BI Developer and Data Modeler
Royal KPN Netherlands
- Developed ETL flows to support reporting requirements.
- Created visuals, reports, and dashboards using different reporting tools such as Power BI and Oracle BI.
- Built deployment and test automation scripts using Python.
- Built data models for various BI solutions using erwin Data Modeler.
- Supported the operations using various DevOps and monitoring tools, such as Jenkins and Apache Airflow.
- Worked as a data modeler for a master data management program using erwin Data Modeler.
Lead Consultant
Altran Netherlands
- Developed and supported data warehousing innovation using Informatica PowerCenter, Teradata, and SAP BusinessObjects.
- Supported the DWH day-to-day operations by monitoring daily jobs.
- Participated in an IT transformation project with a client for the data domain in the telecommunications industry.
- Oversaw campaign management teams within the organization by optimizing test and target group customers.
- Developed and maintained SQL scripts on different platforms, including Teradata and Oracle, to analyze various stakeholders.
Senior Data Specialist
IBM Egypt
- Developed ETL flows using IBM InfoSphere DataStage.
- Designed and implemented a DWH model on a DB2 database.
- Maintained the operations of a medium-sized DWH solution.
- Performed migrations of higher versions of ETL and database tooling.
- Developed SQL scripts for reporting and testing purposes.
EDW and BI Senior Analyst Programmer
Orange Egypt
- Contributed to the migration to a Teradata enterprise data warehouse.
- Developed frequent business reports using BusinessObjects.
- Created KPI dashboards using QlikView and Built ETL flows using IBM Infosphere DataStage.
- Developed SQL scripts to build various Data Marts for different business users.
- Wrote ad-hoc reports for campaigning and operational optimization purposes.
Experience
Code Samples
https://github.com/kall1802-gitMigration to Enterprise Data Warehouse
Executive Dashboard: Mobile Operator
Shopify Project: Print On-demand
Managed all online store including product listing, store design, order fulfillment, and customer service
Quinde Foundation Education Project (TopVolunteer)
The project helped the foundation to start creating their educational platform (MVP), where they can include their programs and give access to all the children that benefit from their work.
Education
Bachelor of Science Degree in Computer Science
Cairo University - Giza, Egypt
Certifications
AWS Certified Developer - Associate
Amazon Web Services
AWS Certified Solutions Architect Associate
AWS
AWS Certified Cloud Practitioner
AWS (Amazon Web Services)
Professional Scrum Master I
Scrum.org
Data Warehouse Concepts, Design, and Data Integration
Coursera
Database Management Essentials
Coursera
R Programming
Coursera
Project Management Professional (PMP)
Project Management Institute
Skills
Libraries/APIs
Fabric, Complex SQL Queries, REST APIs, Pandas, Node.js, React, Google APIs, Google Maps API, LinkedIn API, Social Media APIs, API Development
Tools
Informatica ETL, Microsoft Power BI, Git, Microsoft Excel, Tableau, Erwin, Qlik Sense, Power BI Desktop, Power Query, Microsoft Access, Power BI Report Server, Claude Code, IBM InfoSphere (DataStage), Smartsheet, Microsoft Power Apps, Sublime Text, AWS Glue, Microsoft Power Pages, Apache Airflow, Jenkins, GitLab CI/CD, AWS CodeCommit, AWS CodeBuild, Amazon Virtual Private Cloud (VPC), Amazon Simple Notification Service (SNS), Amazon Simple Queue Service (SQS), AWS IAM, Wrike, Asana, Microsoft Dynamics
Languages
SQL, Python, Snowflake, Transact-SQL (T-SQL), Power Query M, Arabic, Stored Procedure, R, TypeScript, Java, CSS, HTML, HTML5, Excel VBA, VB, Visual Basic for Applications (VBA)
Paradigms
Database Design, ETL, Business Intelligence (BI), Agile, Scrum, Testing, Requirements Analysis, HIPAA Compliance, DevOps, Agile Project Management, Azure DevOps
Platforms
Amazon Web Services (AWS), Shopify, Microsoft Power Automate, SharePoint, Microsoft Fabric, Azure, Docker, Microsoft, Qlik, Azure Service Fabric, Fabric Lakehouse, Linux, Visual Studio Code (VS Code), Oracle, Oracle Data Integrator (ODI), QlikView, Kubernetes, AWS Lambda, Amazon EC2, SharePoint 365, Microsoft Power Platform, Azure SQL Data Warehouse, Databricks, Azure Data Lake Storage, Vercel
Storage
Databases, Relational Databases, Database Modeling, PostgreSQL, Microsoft SQL Server, SQL Stored Procedures, DB, Azure SQL, Data Pipelines, Database Architecture, Data Lakes, MySQL, Teradata, Oracle RDBMS, Database Administration (DBA), Amazon S3 (AWS S3), PL/SQL, SQL Server Reporting Services (SSRS), SQL Server Integration Services (SSIS), SQL Functions, SQL Triggers, Database Replication, Datastage, IBM Db2, Database Testing, Amazon DynamoDB, Microsoft Entra ID
Frameworks
Next.js, Hadoop, Agentic Frameworks
Industry Expertise
Healthcare, Project Management
Other
Data Visualization, Data Modeling, Data Analysis, Stripe Payments, Shopify Payments, Data Warehousing, Data Warehouse Design, Data Engineering, Data, Data Architecture, DAX, Data Loading, Data Analytics, Database Schema Design, Integration, Reporting, Data Reporting, Business Requirements, Dashboards, Technical Hiring, Source Code Review, Code Review, Task Analysis, Interviewing, Data-level Security, Data Migration, Database Normalization, Performance Tuning, Query Optimization, Data Transformation, Architecture, Airtable, ETL Tools, Communication, Relational Database Design, Relational Database Services (RDS), ELT, CSV, ETL Pipelines, Fact Tables, Excel 365, Analytics, Automation, Data Integrity, Documentation, Back-end, Social Networks, Artificial Intelligence (AI), Enterprise Data Warehouse (EDW), SQL Server, Reports, Cloud Architecture, Indexing, Project Management Professional (PMP), PSM-1, Containers, Amazon RDS, APIs, SharePoint Online, Report Design, Dashboard Design, Data Science, Product Lifecycle Management (PLM), Amazon EventBridge, Business Analysis, Training, Data Governance, API/Services Architecture, SaaS, API Integration, Read Replicas, Supabase, HIPAA, Big Data, GitHub Actions, Agentic AI, Agentic AI Systems, Agentic Workflow Design, Full-stack, Full-stack Development, Large Language Models (LLMs), Minimum Viable Product (MVP), Prompt Engineering, LinkedIn, OAuth, Healthtech, Health Informatics, Medical Applications, Biostatistics, AI Agents, AI-assisted Development, AI-generated Code, Finance, Compliance, Data Security, Product Management, Software Architecture, Web Development, CTO, Informatica, SAP BusinessObjects (BO), Cloud, AWS Cloud Architecture, IT Project Management, R Programming, Oracle BI, AWS CodePipeline, Amazon API Gateway, Program Management, Data Build Tool (dbt), ClickUp, Microsoft 365, Zoho, Dynamics CRM 365, Agentic Coding, Supabase Auth, Data Strategy, Machine Learning
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