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Oscar Wash

@oscarwash

Senior software engineer at TEKsystems building .NET services and modernizing legacy applications.

At TEKsystems (DDI Technology, Inc.), I build, test, and deploy application components across application, service, and database layers. I develop RESTful APIs secured with JWT, OAuth, and OpenID Connect, and migrate legacy .NET Framework applications to modern .NET.

At RevOne Companies, Inc., I architected and built a cloud-native, microservices-based SaaS platform using Azure and AWS. I also led an offshore development team through defect resolution and feature delivery; earlier, I worked on federal financial systems for DFAS and healthcare and public health systems under HIPAA requirements.

Experience

Work history, roles, and key accomplishments

Current

Software Developer – .NET Core

Current

TEKsystems (DDI Technology, Inc.)

Nov 2022 - Present (3 years 11 months)

Build, test, and deploy application components using C#, .NET Core, and SQL Server. Develop and maintain RESTful APIs secured with JWT, OAuth, and OpenID Connect, and migrate legacy .NET Framework applications to modern .NET.

C#.NET Core SQL Server REST APIs JWT OAuth OpenID Connect Azure DevOps Git CI CD Postman GitHub Co Pilot Claude

Web Developer / Team Lead

RevOne Companies, Inc.

Oct 2018 - Nov 2022 (4 years 1 month)

Architected and built a cloud-native, microservices-based SaaS platform using C#/.NET Core, ASP.NET Core Web API, and PostgreSQL/SQL Server. Led an offshore development team, conducted code reviews, and delivered releases through Azure DevOps pipelines.

C#.NET Core .NET Core Web API Entity Framework Core PostgreSQL SQL Server Azure App Services Azure Functions S3 AWS Lambda REST APIs Azure DevOps Git Team Foundation Server Jira Postman

Software Architect Consultant

Executive Software Systems, Inc. / Pelican Systems, Inc.

Jan 2018 - Oct 2018 (9 months)

Designed and developed a transactional application converting a legacy PowerBuilder system to C# and ASP.NET MVC with Entity Framework and SQL Server. Developed application components using C#, SQL Server, SSRS, SSIS, and RESTful APIs.

C#ASP.NET MVC Entity Framework SQL Server SSRS SSIS REST APIs T SQL

Software Architect Consultant

Creative Solutions Consulting, Inc. – Defense Finance and Ac

Jun 2016 - Dec 2017 (1 year 6 months)

Developed and maintained mission-critical, high-transaction-volume federal financial systems using C#, .NET Framework, WPF, Entity Framework, Oracle, and SQL Server. Performed data mining analyses and optimized query performance on large-scale financial datasets.

C#.NET Framework WPF Entity Framework Oracle SQL Server Data Mining Query Optimization Root Cause Analysis

Senior Software Consultant

Creative Solutions Consulting, Inc. – Indiana State Departme

Oct 2012 - Mar 2016 (3 years 5 months)

Led development of transactional healthcare and public health systems using C#, VB.NET, Entity Framework, ASP.NET MVC, and SQL Server/Oracle. Designed database tables and data warehouse structures, and built SSIS pipelines.

C#VB.NET Entity Framework ASP.NET MVC SQL Server Oracle Data Warehouse Design SSIS

Senior Software Consultant

Creative Solutions Consulting, Inc. – Indiana Family & Socia

Feb 2012 - Oct 2012 (8 months)

Led development of Medicaid transactional systems using C#, ASP.NET MVC, VB.NET, and Entity Framework, with a focus on data reliability and performance at scale. Designed data warehouse structures and SSIS pipelines for statewide Medicaid systems under HIPAA compliance.

C#ASP.NET MVC VB.NET Entity Framework Data Warehouse Design SSIS HIPAA

Senior Software Consultant

Creative Solutions Consulting, Inc. – Indiana Department of

Feb 2011 - Feb 2012 (1 year)

Developed a statewide ASP.NET/C# transactional application with a SQL Server backend. Served as developer and lead tester across multiple release cycles, and led automated testing and quality standards.

ASP.NET C#SQL Server Testing Automation Quality Assurance