Sean is available for hire
Hire SeanSean Wu
Verified Expert in Engineering
SQL Developer
Cary, NC, United States
Toptal member since June 6, 2018
Bio
Sean is an expert in database design and development with a focus on in-house application development. He is ready to support executive decision making and production improvement processes for businesses of any size.
Portfolio
Blue Cross Blue Shield NC
Star Schema, Entity-relationships Model (ERM), Teradata, Excel 2016, Windows...
McKeil Marine (via Toptal)
Entity-relationships Model (ERM), Azure SQL, Excel 2016, Windows, SQL...
CCL
MacOS, Software Development, .NET, Microsoft Access, Excel 2016...
Experience
- Microsoft SQL Server - 10 years
- Transact-SQL (T-SQL) - 10 years
- SQL - 10 years
- C#.NET - 8 years
- Microsoft Visual Studio - 8 years
- Azure SQL - 2 years
- Azure SQL Databases - 2 years
- Amazon Web Services (AWS) - 1 year
Preferred Environment
Microsoft SQL Server
The most amazing...
...database I've designed was for a high-secure organization requiring serial number production with no duplication.
Work Experience
Data Modeler
2018 - PRESENT
Blue Cross Blue Shield NC
- Designed and created database models for enterprise-wide projects.
- Created tables and views.
- Performed data analysis.
- Completed R&D for new technology.
Technologies: Star Schema, Entity-relationships Model (ERM), Teradata, Excel 2016, Windows, C#, Tableau, Python, SQL, Database Design, Database Architecture, Databases
SQL Developer
2019 - 2020
McKeil Marine (via Toptal)
- Developed a business oriented database on Microsoft Azure from scratch.
- Created all tables based on business needs.
- Created complex stored procedures to meet business requirements.
- Created complex views.
- Created triggers.
Technologies: Entity-relationships Model (ERM), Azure SQL, Excel 2016, Windows, SQL, Database Architecture, Databases
Database Developer and Administrator
2010 - 2018
CCL
- Designed, created, and managed primary objects such as tables, triggers, database links, indexes, and privileges based on a logic design model.
- Developed all the required stored procedures, user-defined functions, and dataset results in reporting services to reduce code complexity and optimize performance.
- Developed applications for manufacturing efficiency improvement.
- Created conceptual, logical, and physical data models for creating the schema using MS Visio and ER/star/snowflake schema for data marts.
- Applied technical skills using SQL, Excel in data collection, data analysis, and reporting to procure data from database structures to report and provide solutions to client requests in a timely manner.
- Contributed to building business dashboards to conduct trend analysis on sales metrics especially relating to driving sales revenue, customer retention, and production.
- Tuned, troubleshot, evaluated, and recommended database hardware and software including support tools to increase performance.
- Provided support to developers for integrating development environment (C#) into databases.
Technologies: MacOS, Software Development, .NET, Microsoft Access, Excel 2016, Microsoft Visual Studio, C#.NET, SQL Server 2016, SQL Server 2014, SQL Server 2008, Windows, Snowflake, Star Schema, Entity-relationships Model (ERM), Visio, Data & Backup Management, Microsoft SQL Server, Database Architecture, Databases
Experience
Production Control Portal
This is a web-based internal portal for
1) employees logging their working hours to work orders
2) supervisors logging in to run reports and modify incorrect data entry
3) executive team logging in to run production-related reports for decision making
4) sales team logging in to enter new or potential sales opportunity
5) viewing of production real-time dashboard
It is made with ASP.NET, using C# on the front-end and Microsoft SQL Server on the back-end.
1) employees logging their working hours to work orders
2) supervisors logging in to run reports and modify incorrect data entry
3) executive team logging in to run production-related reports for decision making
4) sales team logging in to enter new or potential sales opportunity
5) viewing of production real-time dashboard
It is made with ASP.NET, using C# on the front-end and Microsoft SQL Server on the back-end.
Business Oriented Database
The client needed a website for trip planning. I created the database on the back end from scratch, including logical model design, physical model deployment, table and view creation, and complex stored procedures design and creation to meet all business needs.
Marine Voyage Tracking System
I worked as a database developer to create the entire database, including tables, views, triggers, and stored procedures for a web-based marine voyage tracking system for a marine transportation company. The database is on Microsoft Azure.
Education
2007 - 2009
Master's Degree in Information System
University of North Carolina at Greensboro - North Carolina
2002 - 2006
Bachelor's Degree in Computer Science
Zhengzhou University - China
Certifications
MARCH 2021 - MARCH 2024
AWS Certified Cloud Practitioner
Amazon Web Services
MARCH 2017 - PRESENT
Microsoft® Certified Solutions Expert: Data Platform
Microsoft
FEBRUARY 2017 - PRESENT
Microsoft® Certified Solutions Expert: Business Intelligence
Microsoft
JANUARY 2017 - PRESENT
Microsoft® Certified Solutions Expert: Data Management and Analytics
Microsoft
DECEMBER 2016 - PRESENT
Microsoft® Certified Solutions Associate: SQL Server 2012/2014
Microsoft
Skills
Tools
Microsoft Visual Studio, Excel 2016, Microsoft Access, Visio, Tableau
Languages
SQL, Transact-SQL (T-SQL), C#.NET, Snowflake, Python, C#, Java, Python 3
Paradigms
Database Design
Platforms
Windows, Amazon Web Services (AWS), MacOS
Storage
SQL Server 2016, SQL Server 2008, SQL Server 2014, Database Architecture, Databases, Microsoft SQL Server, Azure SQL, Azure SQL Databases, Teradata, PostgreSQL
Frameworks
.NET
Other
Software Development, Entity-relationships Model (ERM), Star Schema, Data & Backup Management
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