James Mangubat

Available to hire

Hi, I'm James Mangubat, a seasoned .NET Software Engineer specializing in building scalable, multi-tenant SaaS platforms using Domain-Driven Design and Clean Architecture.

About

Hi, I’m James Mangubat, a seasoned .NET Software Engineer specializing in building scalable, multi-tenant SaaS platforms using Domain-Driven Design and Clean Architecture. My main expertise lies in back-end development with ASP.NET Core, but I’m also versatile in frontend technologies like ReactJS and modern JavaScript frameworks. I enjoy collaborating with cross-functional teams, mentoring junior developers, and managing full software development lifecycles.

I have extensive experience delivering CRM and enterprise systems that enhance billing, customer management, and operational efficiency. I’m passionate about writing clean, scalable code and continuously improving performance and developer productivity. Let’s build something great together!

  • 8 years' experience
  • Joined June 2025

Languages

  • EnglishFluent

Industry experience

  • Software & Internet
  • Professional Services
  • Retail
  • Transportation & Logistics
  • Real Estate & Construction
  • Financial Services

More experts in Butuan City, Philippines

Work experience· 7 roles

FreelancerSelfJan 2024 – Apr 2025 · 1 yr 4 mos

Delivered responsive company website for LadonCo with mobile-first UI. Designed full SaaS infrastructure for TintTrack CRM, including Azure CI/CD, CDN, and secure tenant deployment. Led a team of 3 frontend engineers, increasing development velocity by 30% through clear UI architecture, shared component libraries, and streamlined review workflows. Refactored .NET 8 libraries for .NET 9 readiness, improving performance benchmarks by 15–20%. Provided DevOps support for DNS, Plesk, and mail server configuration.

C# .NET Core / .NET 8 Developer · Book That In LtdNov 2023 – Mar 2024 · 5 mos

Upgraded backend to .NET 8, improving code clarity and developer efficiency. Integrated Aprimo DAM to streamline content workflows and governance. Automated asset handling with Aprimo APIs, reducing manual tasks.

Full-Stack .NET 6 Developer · DumpTruckDispatcher.comOct 2022 – Nov 2023 · 1 yr 2 mos

Extensively utilized AspNetZero Boilerplate to accelerate development of new features and improve code maintainability and modularity. Led reporting project with ActiveReports, enhancing client data insights.

Web Developer · HSO Enterprise SolutionsMay 2021 – Sep 2022 · 1 yr 5 mos
Assistant Software Architect / Full-Stack Developer · ProcQ LLCJul 2020 – Apr 2021 · 10 mos
ASP.NET MVC Developer · Zylocon LtdJun 2019 – Jul 2020 · 1 yr 2 mos
Senior .NET Developer · Business Net Solutions LtdAug 2016 – Jun 2019 · 2 yrs 11 mos

Education

Bachelor of Science · AMA Computer College1995 – 2000

Certifications and awards· 8

Microsoft Certified Technologist – SQL Server 20052005
Microsoft Great Plains – Fundamentals, Customizations, and Programming2030 – 2025
Classic ASP.NET – Web Application Development2030 – 2025
Quality Management and Leadership Training2030 – 2025

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