Enterprise development
ASP.NET Core MVC, .NET 8, C#, REST APIs and maintainable architecture.
Your trusted virtual assistant partner
Jhonmar Tolentino
Multidisciplinary IT Professional|
With over 8 years of experience across software development, IT support, graphic design, virtual assistance, administration, and business operations, I combine technical expertise with creative thinking and dependable professional support.
Shipping reliable software
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01 / About
Technical, creative
and business-ready.
I help businesses work smarter through technology, creative communication, and reliable day-to-day support.
My background spans enterprise application development, technical support, database work, reporting, graphic design, virtual assistance, administration, social media content, and sales operations. That range allows me to adapt quickly and contribute wherever thoughtful execution is needed.
Let’s create something useful →Data analytics & reporting
Power BI, Excel, SQL, ETL, data cleaning, visualization, Power Query, RDLC, and Crystal Reports.
Infrastructure
IIS, Windows and Ubuntu Server, Docker, Nginx, Git and Azure DevOps.
Graphic design
Marketing materials, social content, layouts, presentations, and visual communication.
Virtual assistance
Flexible creative and administrative support that helps brands stay visible, organized, and connected with the right audience.
Social Media ManagementLead GenerationGraphic DesignEmail MarketingAdministrative Support
Business operations
Office automation, sales support, reporting, organization, and process improvement.
02 / Experience
A career built around
useful transformation.
2024—2025
San Miguel IT Systems
IT Application Specialist
Developed and supported ASP.NET Core MVC applications for Bank of Commerce and Petron, built hybrid API integrations, prepared deployment guides, led QA/UAT deployments, and supported server migrations.
2022—2024
Physicians' Diagnostic Services Center, Inc. ↗
MIS Programmer
Developed and supported business-critical systems for diagnostic-clinic operations. Maintained WPF/MVVM and clinical applications, helped transition workflows to the web, and delivered integrated inventory, purchasing, stock custodian, department request, accounting, and reporting modules.
2019—2022
Great Sierra Development Corp.
Senior Sales Operations Support
Managed purchase and sales orders in ERP workflows, validated monthly overpayments, and produced forecasts and data visualizations with Excel and Power Query.
Earlier
ABS-CBN · Freelance
Administrative Assistant & Graphic Designer
Combined detail-oriented administration with layout, brand, and visual communication work.
03 / Education
Learning that keeps
moving forward.
College · Information Technology
Bachelor of Science in Information Technology
University of Caloocan City
Software DevelopmentDatabase SystemsIT Infrastructure
Official university website ↗
High school · Secondary education
F.G. Calderon Integrated School
A formative academic foundation that helped develop discipline, curiosity, collaboration, and a lasting interest in technology.
Academic FoundationCollaborationTechnology Interest
Visit school page ↗
11 active courses
Certifications & active learning
Continuous development
Building deeper expertise through verified training and ongoing coursework in .NET MVC, PHP, MySQL, Excel VBA, WordPress, and modern web development.
Always learning · 2021—presentSelected credentials
Training & certifications
Hands-on professional development across analytics, full-stack web technologies, databases, and network infrastructure.
March 19, 2023 · 6 hours
Data Analytics Foundations
DataSense Analytics
Power BIETLData CleaningSQLExcelPower Query
View certificate ↗
In the workshop
Learning by building.
03 / Toolkit
Built for the
whole stack.
Technology is only valuable when it solves the right problem. These are the tools I use to move from concept to reliable production software.
C#ASP.NET COREPOWER BISQLPOWER QUERYEXCELC#ASP.NET COREPOWER BISQLPOWER QUERYEXCEL
Programming
C# · ASP.NET Core · .NET 8 · Entity Framework · JavaScript · HTML · CSS · Bootstrap
Data analytics
Power BI · ETL · Data Cleaning · Data Visualization · SQL · PivotTables · VLOOKUP · Excel Formulas · Power Query
TransformAnalyzeVisualize
Delivery tools
Visual Studio · Git · Azure DevOps · IIS · Docker · Nginx · Ubuntu · Postman
Visual design
Photoshop · Illustrator · Canva · Figma · UI/UX Design
04 / Selected work
Solutions with
measurable purpose.
Live system · 5 screens01
Enterprise platform
Inventory Management System
Built with ASP.NET Core 8 MVC, this connected platform manages purchasing, inventory, approvals, receiving, stock custody, and department requests. RDLC powers print-ready PDF reports, while Excel export supports analysis and operational reporting.
PDF RDLC reportsXLSX Excel export
92%
02People operations
Performance Evaluation
Structured evaluations, scoring, and clear performance insight.
◇
03Operations
Asset Management
Lifecycle tracking and accountability for business-critical assets.
X↔API04
Integration
Xero API Integration
Secure data flow between internal workflows and cloud accounting.
+24%
05Business intelligence
Dashboard Analytics
Decision-ready metrics transformed into a focused visual story.
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05 / Résumé
The concise version.
Experience, education, technical strengths, and the work behind the systems—all in one print-friendly view.
ExperienceEnterprise IT · Development · Operations · Design
EducationCollege · High School · Continuing Certification
Focus.NET engineering · Data · Automation
06 / Beyond work
Driven by curiosity.
Recharged outdoors.
The same energy I bring to projects comes from exploring new trails, staying active, and making time for the sea.
Move
Running
“One step, then another.”Discipline, momentum, and a clear mind.
06 / Working together
Trusted for the
details that matter.
“Jhonmar brings structure to complex requirements and stays focused on the people who will use the system.
“A dependable technical partner—from discovery and documentation through deployment and early-life support.
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07 / Contact
Let’s work
together.
Connect with me for software development, graphic design, virtual assistance, social media management, lead generation, email marketing, or administrative support.
Metro Manila, Philippines