Business Application Specialist
I focus on systems that support accounting, operations, records, and process-heavy business environments.
Available for freelance and full-time opportunities
Allan Murillo Software Developer
I build reliable desktop, web, and cloud-based business systems with strong database foundations, practical UX, and maintainable code.
8+
Business systems delivered across core operations
Full-cycle
Planning, database design, UI, development, deployment
Client-ready
Built for real teams, daily workflows, and long-term use
About Me
Software built around real business operations
I specialize in business applications, accounting systems, management systems, automation, and database-driven software that helps teams work faster and with fewer errors.
Database-Driven Architecture
I design software around stable data models, reliable reporting, and workflows that remain maintainable over time.
Automation and Usability
I streamline repetitive work and build interfaces that are clear for day-to-day staff, managers, and administrators.
Skills
Core technologies I use to build stable systems
A mix of desktop engineering, full-stack web development, and cloud deployment experience.
Programming Languages
C#
PHP
TypeScript
JavaScriptFrameworks
.NET Framework
React
Vite
Node.jsWeb Fundamentals
HTML5
CSS3
Responsive UI
npmDatabases
Microsoft SQL Server
MySQL
PostgreSQL
SQLiteCloud and API
AWS
REST API
OpenAPI
PostmanTools and Workflow
Git
GitHub
VS Code
Visual Studio
Services
Professional development support for business software
From internal tools to cloud-ready systems, the focus stays on performance, clarity, and reliability.
Desktop Application Development
Custom internal tools for accounting, operations, inventory, payroll, and other process-heavy workflows that need speed and stability.
Web-Based Management Systems
Responsive platforms for administration, monitoring, reporting, and multi-user workflows that help businesses work from anywhere.
Database Design and Optimization
Well-structured schemas, faster queries, reporting-ready models, and cleaner data flow for dependable long-term maintenance.
Cloud Deployment using AWS
Production-ready deployments with secure hosting, backups, and scalable infrastructure using AWS services.
Website Development
Professional websites and front-end experiences designed to build trust, explain services clearly, and load fast on every device.
System Maintenance and Support
Ongoing fixes, enhancements, support, and performance tuning for systems that need to remain dependable over time.
Projects
Selected systems and product work
Representative project areas showing the type of business software and workflows I can build.
Accounting System
Built for financial recordkeeping, reporting, transaction management, and daily accounting operations with cleaner workflow control.
ResultImproved reporting consistency and reduced manual record handling.
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Payroll System
Handled payroll computation, deductions, employee records, attendance integration, and printable summaries in one workflow.
ResultReduced repetitive salary processing and improved payroll accuracy.
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Martial Arts Management System
Managed student profiles, schedules, classes, payments, and progress tracking in a centralized system.
ResultMade class administration easier and reduced fragmented records.
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QR Code Attendance System
Created faster check-in workflows with QR scanning, attendance logs, monitoring tools, and exportable reports.
ResultShortened attendance processing time and improved tracking visibility.
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Receipt Recording System
Organized receipt logs with searchable records, categorization, and cleaner retrieval for reviews and audits.
ResultMade document retrieval faster and more audit-friendly.
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Website Development Projects
Designed business websites that communicate services clearly, improve trust, and stay responsive across devices.
ResultStrengthened online presentation and improved client-facing credibility.
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Dental Clinic Management System
Unified clinic scheduling, patient history, treatment records, billing, and staff operations in one system.
ResultImproved coordination between appointments, billing, and patient records.
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Invoicing System
Handled invoice creation, customer records, itemized billing, status tracking, and printable outputs.
ResultMade invoicing faster and easier to monitor from creation to payment.
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Why Work With Me
Built for businesses that need software to solve real work
The focus is not just delivering features. It is building systems that improve workflows, keep data reliable, and remain maintainable over time.
Business-first thinking
I build systems around actual business operations, not generic demos, so the result fits how teams really work.
Strong database foundation
Good software becomes more dependable when the data model is clear, scalable, and reporting-friendly from the start.
Clear, usable interfaces
I focus on screens and workflows that are practical for staff, managers, and administrators who use the system daily.
Reliable delivery and support
From planning to deployment and maintenance, I aim for stable systems that can be improved without breaking trust.
Process
A straightforward workflow from idea to working system
Clear delivery matters. I keep the process structured so clients know what is being built and why.
Discovery
Understand the workflow, pain points, users, and business rules before proposing the solution.
Architecture
Plan the data model, system structure, key screens, and technical approach for maintainability.
Build
Develop the application with clean code, practical UX, secure handling, and iterative validation.
Launch and Support
Test, deploy, refine, and support the system so it remains stable in real-world use.
Experience
Built with secure coding, structured data, and practical UX
My experience is centered on developing real business systems where usability, reporting, and long-term support matter.
Business systems that solve operational problems
Delivered software for accounting, payroll, attendance, clinics, billing, and administration where data accuracy matters.
Structured database thinking from day one
Designs tables, relationships, and queries with reporting, performance, and future maintenance in mind.
Interfaces made for real users, not just demos
Builds practical screens and workflows that keep navigation simple, reduce friction, and support daily use.
Secure and maintainable implementation
Applies clean architecture, defensive coding, and stable deployment practices across desktop, web, and cloud solutions.
Client Value
What clients usually look for in business software delivery
The strongest value comes from dependable systems, practical interfaces, and clean structure behind the scenes.
"Allan builds systems with strong structure and practical workflows. The output feels made for actual operations, not just presentation."
Operations-Focused DeliveryBusiness Systems Perspective"His approach balances database design, clean interfaces, and maintainability, which is exactly what business software needs long term."
Technical ReliabilityClient Value Perspective
Contact
Have a project or role in mind?
If you need a developer for desktop software, management systems, cloud-backed tools, or database-heavy applications, let's talk.