ZentoMedia
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Independent developer profile

D. Hung — .NET Core developer for practical product work

I build and improve APIs, web apps, internal tools, and product features with a focus on stable delivery, maintainable code, and clear scope.

Available for selected freelance and product collaboration work with teams that value clear scope, steady delivery, and maintainable implementation.

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Core stack
.NET Core / ASP.NET CoreWeb, mobile, and product toolingFreelance-friendly, incremental delivery

Who I work best with

I work best on focused product work where a client needs someone who can ship steadily without adding unnecessary complexity.

  • Add new features to an existing .NET product
  • Build or refine REST APIs and back-office workflows
  • Modernize or stabilize older ASP.NET codebases
  • Ship lightweight websites or utility tools around a core product

What I usually help ship

The work is often a mix of backend implementation, product thinking, integration, and steady cleanup.

  • ASP.NET Core APIs, application services, and business workflows
  • Web app implementation with practical UI and clear information structure
  • Docker-based local environments and integration-friendly setups
  • Small product decisions that keep scope realistic and maintainable

Selected work

A few representative project groups that show the type of delivery, technical scope, and product work I can support.

ZentoMedia and Toán Vui Zento

Solo product work around a mobile learning app and its supporting website. This includes Android maintenance, release updates, product refinement, and a lightweight public web presence.

JavaAndroid SDKGoogle Play BillingAdMobFirebaseNext.jsTypeScript

Content portal MVP and CMS workflow

A content platform setup around Squidex with supporting vote and webhook services, designed for practical local development and simple operations.

SquidexNode.jsExpressPostgreSQLMongoDBDocker Compose

IoT, licensing, and monitoring platform work

Backend-heavy work across APIs and services related to device, certificate, licensing, and monitoring flows, with observability and background processing in the stack.

.NET 7ASP.NET CoreHangfireSerilogOpenTelemetryAWS IoTAzure IoT

Legacy enterprise travel and service systems

Maintenance and extension work in older ASP.NET MVC and shared service solutions, including integration-oriented code paths and long-lived business modules.

C#.NET Framework 4.8ASP.NET MVCOracleNewtonsoft.JsonIntegration servicesUnit test projects

CMS and framework exploration

Hands-on work around Orchard Core and related front-end asset tooling to understand modular CMS customization and content-driven product workflows.

Orchard CoreASP.NET CoreYarnTypeScriptGulpVue tooling

Core stack

Backend

C#.NET CoreASP.NET CoreREST APIEntity FrameworkAuthentication & authorization

Data & infrastructure

SQL ServerOraclePostgreSQLMongoDBDockerRedisHangfireOpenTelemetrySerilog

Web & product

Next.jsReactTypeScriptTailwind CSSCMS integrationUtility tool design

Other hands-on work

Android app maintenanceGoogle Play release workFirebase / AdMob / Billing integrationLegacy ASP.NET MVC maintenanceAWS IoT and Azure IoT related services

How projects usually run

I prefer direct communication, clear boundaries, and gradual improvement over big rewrites.

  • Start from the current product reality, not from idealized architecture
  • Keep code readable so future changes stay affordable
  • Break work into reviewable steps when requirements are still forming
  • Document enough so the next iteration is easier than the last one

Need a practical .NET developer for a focused project?

If you need help with an API, a web feature, product cleanup, or a maintainable MVP step, feel free to reach out.

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