Software development studio · Koronadal, PH

We build software that keeps working.

Arnex designs, builds and runs custom software for businesses: web and mobile apps, .NET platforms, integrations and content systems. Backed by 14 years in production and code other companies already run.

The fox mascot at a laptop Web apps .NET APIs Built to last
14Years in production software
50Packages published on NuGet
132,926Package downloads
9Fixes merged upstream
Selected work

Engineering you can audit before you sign.

The same engineering behind client work ships in public, with tests, benchmarks and download counts straight from the registries.

One line, no transitive dependencies

Install it in one line. It works.

50 packages on NuGet and ten utilities on npm, all maintained by the same engineer who would build your project.

Full NuGet profile
Verdict ~/arnexsds
$ dotnet add package Verdict
Services

From first prototype to a platform that runs for years.

Hands-on engineering, not slide decks. One accountable engineer across the whole lifecycle.

01

Custom software

Purpose-built systems shaped around how your business actually runs.

02

Web applications

Fast, accessible web apps, from internal dashboards to customer portals.

03

Mobile apps

Android and iOS apps that connect to your existing services.

04

APIs & .NET backends

Performance-focused C#/.NET services, integrations and data layers.

05

CMS builds

Headless content systems on barakoCMS: content types, roles and workflows.

06

Consulting & code review

Architecture advice, audits and pull-request reviews for in-house teams.

07

Open-source tooling

Libraries and developer tools, published and maintained in the open.

08

Maintenance & support

Updates, monitoring and fixes after launch, so the software keeps working.

How we deliver

Four steps. No surprises.

  1. 01 · Scope

    Written scope

    Requirements, milestones and a fixed quote or retainer agreed in writing before any code.

  2. 02 · Build

    Visible progress

    Code lives in your repository from day one, with a working demo at every milestone.

  3. 03 · Verify

    Measured quality

    Integration tests against real databases, published benchmarks, security scanning on every PR.

  4. 04 · Operate

    Run and support

    Hardened hosting, self-renewing TLS, health checks and nightly backups.

  • C#
  • .NET 10
  • ASP.NET Core
  • TypeScript
  • Next.js
  • Go
  • PostgreSQL
  • Marten
  • SQL Server
  • Redis
  • Docker
  • AWS
  • Azure
  • RabbitMQ
  • Playwright
  • Testcontainers
Engagement

Three ways to work together

Quoted per project

Fixed-scope project

A defined deliverable with a fixed quote, milestones and a handover at the end.

  • Written scope and milestones
  • Demo at every milestone
  • Source and docs handed over
Monthly rate

Monthly retainer

A reserved block of development and support hours each month for ongoing work.

  • Reserved hours each month
  • Priority fixes
  • Monitoring and updates
Hourly rate

Hourly consulting

Reviews, architecture sessions and troubleshooting, billed by the hour.

  • Architecture reviews
  • Pull-request reviews
  • Production troubleshooting

Rates quoted in Philippine pesos or US dollars after a free scoping call. Every engagement has a written agreement and an official receipt.

Arnel Robles
The studio

No hand-offs. No account managers.

Arnex Software Development Services is a sole proprietorship owned and operated by Arnel Robles, a .NET engineer with 14 years in production software. You work directly with the person who scopes, writes, tests and supports your code, and who answers the emails.

Contact

Let's build it.

arnel.robles@arnexsds.com
Registered name
Arnex Software Development Services
Type · Proprietor
Sole proprietorship · Arnel Robles
Address
City of Koronadal, South Cotabato, Philippines
Website
arnexsds.com
DTI BN no.
3444913