Freelance software developer in Makassar.

I'm Mardino Santosa (Z Mardino Santosa, zdienos online), an independent full-stack developer and system administrator based in Makassar, South Sulawesi. I work on web applications in PHP — Laravel and CodeIgniter — and JavaScript, and on the Linux and Windows servers they run on. You work with me directly; there is no agency in between.

Discuss your software needs — WhatsApp ↗Or email [email protected]

01The usual call

The usual call.

“We already have the source code. We need an independent developer to maintain it, fix it, migrate it or build on it.”

The previous vendor has moved on, the in-house developer has left, or the application simply outgrew its server. I spent ten years running IT at Transstudio Theme Park Makassar and four years as system administrator and full-stack developer at Kumalagroup, so I am used to both halves of the problem: the code, and the machine it runs on.

02Services

What I can do.

01
Maintenance & troubleshooting
Keeping an existing application running: fixing bugs, chasing errors in logs, and making small changes safely.
02
Taking over from a previous vendor
The vendor is gone but the source code is still there. I read it, get it building and running again, and carry on from there.
03
Legacy modernization
Upgrading old PHP, CodeIgniter or Laravel versions and outdated servers step by step, without stopping the business.
04
Source code audit
A written assessment of a codebase: structure, security issues, outdated dependencies and what to fix first.
05
Web application development
Internal tools and business web apps on Laravel, CodeIgniter, Node.js and React, with MySQL or MariaDB.
06
APIs & integration
REST APIs and connections between systems, so data stops being copied by hand.
07
Database troubleshooting
Slow queries, broken data, backups and restores on MySQL, MariaDB and SQL Server.
08
Linux server administration
Setting up, securing and looking after Linux servers and VPSes, LAMP stacks and hosting panels such as CentOS Web Panel and aaPanel.
09
Deployment & migration
Moving an application to a new server or hosting provider, and making deploys repeatable instead of manual.
10
DevOps & infrastructure
Docker, Git-based deploys, automation and monitoring for small teams that don't have a dedicated ops person.
11
IT consulting & networks
Advice and hands-on work on networks (MikroTik, Cisco), servers and day-to-day IT for small organisations, from planning to training the staff.

Tools I use for it

Linux · Windows Server 2019 · Hyper-V · Bash Shell · LAMP · CentOS Web Panel · aaPanel · Docker · MikroTik · Cisco · HTML · CSS · JavaScript · jQuery · React · PHP · CodeIgniter · Laravel · Node.js · REST APIs · MariaDB · MySQL · SQL Server · Git Flow · Automation

03Track record

Track record.

Where I've worked

Freelance Software Developer2023–2026Independent
System Administrator & Full Stack Developer2019–2023Kumalagroup Makassar
IT Consultant2015Bappeda Kabupaten Mamuju
System & Hardware Administrator2009–2019Transstudio Theme Park Makassar
Lecturer2008–2009STMIK Dipanegara
Instructor2007–2008AMIK Professional College

Some of what I've built

iSetIT asset management for every IT asset at a previous employer. Built with CodeIgniter.
iHelpA web app for tracking requests and work progress in an IT department. Built with CodeIgniter.
Employee Rating SystemA decision-support system for assessing employee performance. Built with CodeIgniter.
Dealer Management SystemRuns the day-to-day process of an automotive (car) dealer. Built with CodeIgniter, Node.js and React.
VoucherGeneratorGenerates usernames and passwords for MikroTik hotspot vouchers. Built with Visual Basic.
MockupExportA Photoshop script that exports many variants of a mockup design at once, e.g. name cards in different styles.

Plus 15 websites shipped. See the work or read the CV.

04How it works

How it works.

1
Talk
Tell me on WhatsApp or email what the software does and what is going wrong or missing.
2
Look
With access to the code or server, I check what is really there before promising anything.
3
Agree
You get a written scope and estimate. Work starts when it makes sense to you.
4
Work
Small, testable steps in Git, with regular updates on what changed.
5
Hand over
Notes on what was done and how to run it, so you are never locked in.

05Questions

Fair questions.

Are you a company or a software house?: No. I'm an independent developer — you work directly with me, the person who writes and deploys the code.
Can you continue an application built by someone else?: Yes, that is a large part of my work. If you have the source code and access to the server or hosting, I can assess it and continue from there.
Which technologies do you work with?: PHP (Laravel, CodeIgniter), JavaScript (Node.js, React), MySQL, MariaDB and SQL Server, on Linux and Windows Server, with Docker and MikroTik on the infrastructure side.
Do you only work with clients in Makassar?: I'm based in Makassar, South Sulawesi, and work with clients elsewhere in Indonesia remotely.
How do we start?: Send a WhatsApp message describing the application and the problem. We discuss it first; there is no commitment until you agree to a scope.

06Start

Tell me what's broken.

A short message is enough: what the application does, what it runs on, and what you need. I'll reply with questions or a first take.

Discuss your software needs — WhatsApp ↗Or email [email protected]

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Freelance software developer in Makassar.

The usual call.

“We already have the source code. We need an independent developer to maintain it, fix it, migrate it or build on it.”

What I can do.

Maintenance & troubleshooting

Keeping an existing application running: fixing bugs, chasing errors in logs, and making small changes safely.

Taking over from a previous vendor

The vendor is gone but the source code is still there. I read it, get it building and running again, and carry on from there.

Legacy modernization

Upgrading old PHP, CodeIgniter or Laravel versions and outdated servers step by step, without stopping the business.

Source code audit

A written assessment of a codebase: structure, security issues, outdated dependencies and what to fix first.

Web application development

Internal tools and business web apps on Laravel, CodeIgniter, Node.js and React, with MySQL or MariaDB.

APIs & integration

REST APIs and connections between systems, so data stops being copied by hand.

Database troubleshooting

Slow queries, broken data, backups and restores on MySQL, MariaDB and SQL Server.

Linux server administration

Setting up, securing and looking after Linux servers and VPSes, LAMP stacks and hosting panels such as CentOS Web Panel and aaPanel.

Deployment & migration

Moving an application to a new server or hosting provider, and making deploys repeatable instead of manual.

DevOps & infrastructure

Docker, Git-based deploys, automation and monitoring for small teams that don't have a dedicated ops person.

IT consulting & networks

Advice and hands-on work on networks (MikroTik, Cisco), servers and day-to-day IT for small organisations, from planning to training the staff.

Tools I use for it

Track record.

Where I've worked

Freelance Software Developer2023–2026Independent
System Administrator & Full Stack Developer2019–2023Kumalagroup Makassar
IT Consultant2015Bappeda Kabupaten Mamuju
System & Hardware Administrator2009–2019Transstudio Theme Park Makassar
Lecturer2008–2009STMIK Dipanegara
Instructor2007–2008AMIK Professional College

Some of what I've built

iSetIT asset management for every IT asset at a previous employer. Built with CodeIgniter.
iHelpA web app for tracking requests and work progress in an IT department. Built with CodeIgniter.
Employee Rating SystemA decision-support system for assessing employee performance. Built with CodeIgniter.
Dealer Management SystemRuns the day-to-day process of an automotive (car) dealer. Built with CodeIgniter, Node.js and React.
VoucherGeneratorGenerates usernames and passwords for MikroTik hotspot vouchers. Built with Visual Basic.
MockupExportA Photoshop script that exports many variants of a mockup design at once, e.g. name cards in different styles.

Plus 15 websites shipped. See the work or read the CV.

How it works.

Talk

Tell me on WhatsApp or email what the software does and what is going wrong or missing.

Look

With access to the code or server, I check what is really there before promising anything.

Agree

You get a written scope and estimate. Work starts when it makes sense to you.

Work

Small, testable steps in Git, with regular updates on what changed.

Hand over

Notes on what was done and how to run it, so you are never locked in.

Fair questions.

Are you a company or a software house?

No. I'm an independent developer — you work directly with me, the person who writes and deploys the code.

Can you continue an application built by someone else?

Yes, that is a large part of my work. If you have the source code and access to the server or hosting, I can assess it and continue from there.

Which technologies do you work with?

PHP (Laravel, CodeIgniter), JavaScript (Node.js, React), MySQL, MariaDB and SQL Server, on Linux and Windows Server, with Docker and MikroTik on the infrastructure side.

Do you only work with clients in Makassar?

I'm based in Makassar, South Sulawesi, and work with clients elsewhere in Indonesia remotely.

How do we start?

Send a WhatsApp message describing the application and the problem. We discuss it first; there is no commitment until you agree to a scope.