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Edgar Pereyra

@edgarpereyra

Senior Software Engineer at Apex Systems who modernized a legacy mainframe platform to .NET Core 8 and developed an auditing module.

Mexico

Message

At Apex Systems, I led the modernization of a legacy mainframe platform, migrating core services to .NET Core 8 to improve scalability and maintainability. I also designed and implemented an auditing module using Cosmos DB to trace data changes across systems.

At Apex Systems, I developed Angular 17 features and managed AWS deployments. I also contributed to SCRUM ceremonies and estimations as part of agile delivery.

At Dalton Corporation, I provided technical leadership to a full-stack development team using .NET and Angular. I guided architecture decisions, facilitated SCRUM ceremonies, and worked with the Product Owner to clarify requirements.

Earlier, I modernized legacy systems and developed applications and APIs at Intecproof, Abisoft, Torstein Professional Business, and IM Tecnologia Aplicada. My work included .NET development, Angular applications, SQL Server optimization, and Windows Forms development.

Experience

Work history, roles, and key accomplishments

Current

Sr Consultant

Current

Apex Systems

Apr 2023 - Present (3 years 6 months)

Modernized a legacy mainframe platform to .NET Core 8, improving scalability and maintainability. Developed Angular 17 features and managed AWS deployments, while contributing to SCRUM ceremonies and estimations.

.NET Core 8.0 Angular 17 AWS Azure Cosmos DB Scrum Legacy Modernization

Tech Lead

Dalton Corporation

Feb 2022 - Jan 2023 (11 months)

Led a full-stack development team using .NET and Angular, providing technical leadership and facilitating SCRUM ceremonies. Acted as primary technical liaison with the Product Owner, reducing rework and improving requirement clarity.

.NET Angular Technical Leadership Scrum Sprint Planning Product Collaboration

Angular .NET Dev

Abisoft

Feb 2021 - Jan 2022 (11 months)

Developed and enhanced Angular 12 applications and .NET Core APIs, improving performance and user experience. Applied frontend best practices with Angular and TypeScript, increasing code maintainability and UI consistency.

Angular 12+.NET Core TypeScript Frontend Development Best Practices

.NET Dev

Intecproof

Jun 2020 - Jul 2021 (1 year 1 month)

Modernized a 20-year legacy system by migrating to modern .NET technologies and introducing reusable components. Optimized SQL Server stored procedures and backend logic, improving application performance and response times.

.NET SQL Server Legacy Modernization Performance Optimization

.NET Dev

Torstein Professional Business

Oct 2019 - Jun 2020 (8 months)

Maintained and enhanced legacy .NET applications while adopting SCRUM practices to improve release cadence and stability.

.NET Framework SQL Server Scrum Legacy System Maintenance

.NET Dev

IM Tecnologia Aplicada

Jan 2017 - May 2018 (1 year 4 months)

Developed Windows Forms applications using C#, VB.NET, and SQL/MySQL, delivering stable desktop solutions for clients. Supported end-to-end development lifecycle, from analysis to deployment, ensuring reliable application releases.

C#VB.NET SQL MySQL Windows Forms Full Lifecycle Development