Building software that turns complexity into clarity.
Hi, I’m Rahmatullah. I design and build applications, data systems, and intelligent automation that transform complex workflows into simple, reliable digital experiences — from the interface people use to the data, logic, and systems behind it.
A structured view of what I build.
Technologies are grouped by the problems they solve—so the stack supports the work instead of becoming the whole story.
Full-stack web engineering
Responsive interfaces, APIs, databases and complete business applications designed as one maintainable system.
Front end
HTML5
CSS3
JavaScript
TypeScript
React
Next.jsBack end & data
Node.js
Python
PostgreSQLAPIREST APIsSQLSQLAndroid and application development
Production-minded mobile experiences with persistent state, background services, offline capability and careful interaction design.
Application stack
Flutter
Dart
Android
SQLiteEngineering focus
Data and analytics systems
Reliable analysis starts with source logic, quality checks and understandable measures—not only with a final dashboard.
Analysis & databases
SAP HANAPython
pandasSQLSQLReporting & visualization
Power BI
Tableau
ExcelQAData qualityAutomation and integration
Repeatable workflows that reduce manual preparation, enforce business rules and make operational outputs easier to trust.
Automation
PythonVBAExcel VBAAPIAPI integrationETLData pipelinesDelivery
Git
GitHubDOCDocumentationVALValidationSystems, infrastructure and networks
Operational technology experience across installation, configuration, access, connectivity and the supporting environment around software.
Systems
Linux
DockerCLCloudSVServersOperational technology
Products and systems with a reason to exist.
Each project belongs to a wider capability area. Open a case study for the problem, approach and engineering details.
Shifa Quran
A carefully engineered Quran reading and listening experience with synchronized recitation, offline audio and privacy-conscious local progress.
Open case study →FlexiRetail
Retail operations brought into one system across inventory, sales and reporting.
Open case study →Operational data systems
Dashboards, structured data workflows and automation designed around reliable decisions.
Open case study →Built across layers, not inside one label.
More than fifteen years connecting technology, information and operations.
Data & information systems
Operational analytics, SQL workflows, dashboards, data quality and automation that supports real decisions.
Applications & business software
Android experiences, full-stack systems and operational tools developed from requirements through testing and release.
Infrastructure & systems
Networks, servers, access-control technology, installation, configuration and user support.
Practical knowledge, documented clearly.
A future home for tutorials, working notes and guides drawn from real development, data and automation work.
Flutter & Android
Production audio, state, offline design and application polish.
Learning series planned → 02SQL & Analytics
Queries, validation, dashboards and decision-ready measures.
Learning series planned → 03Automation
Python, Excel VBA and repeatable operational workflows.
Learning series planned → 04Web Systems
Front end, APIs, databases and maintainable product architecture.
Learning series planned →Have something useful to build?
For software, mobile, data, automation or operational-system work, start with a short description of the problem.