Open to opportunities

JOHN MARK OLESCO

@johnmarkolesco

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Senior Software Engineer specializing in .NET, ReactJS, and scalable API solutions.

Philippines

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What I'm looking for

I seek a role where I can lead technical initiatives, improve system efficiency, mentor engineers, and deliver scalable cloud-enabled .NET and React solutions.

I am a Senior Software Engineer with 10+ years of experience building scalable .NET and ReactJS applications, designing APIs, and leading cross-functional teams to deliver impactful business solutions that improve efficiency and reliability.

I have driven measurable results—streamlining processes up to 73%, improving claim processing time by 50%, and increasing system performance—while mentoring developers, implementing CI/CD and cloud solutions, and consistently applying best practices in architecture and testing.

Experience

Work history, roles, and key accomplishments

Current

Software Engineer Level IV

Current

Arch Global Services Philippines Inc

Mar 2022 - Present (3 years 7 months)

Developed automated triage feature that streamlined business processes by 73% and designed new business functionality that improved claim processing time by 50%, while ensuring best practices and reliable deployments across DEV/QA/STAGING environments.

C# .NET .NET Core ReactJS Azure Entity Framework Docker CI CD API Development

Senior Software Developer

Encora Philippines

Sep 2021 - Mar 2022 (6 months)

Integrated payment channels (Apple Pay, Google Pay, Samsung Pay) to enhance user payment experiences and collaborated on system enhancements for mobile payment platforms, while providing Level 1 support and trial runs for applications.

C# .NET .NET Core Entity Framework LINQ Agile Docker Kubernetes CI CD

Senior Solution Analyst

PCCW Solution Limited

Mar 2020 - Sep 2021 (1 year 6 months)

Delivered middleware and customer-facing .NET applications for the Hong Kong government, led a team to implement solutions and trained developers to accelerate timelines, and developed web apps for process automation and paper-system conversion.

C# .NET .NET Core ReactJS Onion Architecture Agile MVVM Dependency Injection Unit Testing

Senior Software Engineer

Blotocol Incorporated Philippines

Apr 2018 - Apr 2020 (2 years)

Led systems analysis, programming and code reviews to maintain high-quality standards, developed solutions that drove revenue growth and improved employee outcomes, and translated specifications into implementable technical requirements.

C# .NET .NET Core ReactJS Azure Docker Entity Framework Redux Git

Programmer

Strategic Synergy Inc & TIM Software

Feb 2016 - Apr 2018 (2 years 2 months)

Automated business processes via ERP development, analyzed client requirements to build systems from scratch, and implemented technologies that improved system performance by 40%.

C# .NET SDLC jQuery SQL MVC MVVM

Jr System Integration Developer

Wiki Malahini

Apr 2014 - Nov 2015 (1 year 7 months)

Led full SDLC efforts for integration projects, trained business users, and maintained/enhanced existing systems through code modifications and program logic updates.

C# .NET Bootstrap jQuery JavaScript SQL MVC