Retail
POS System
A retail point-of-sale platform handling real-time sales transactions, receipt generation, discounts, and integrated card and cash payment workflows.
Open to full-time, contract & freelance - remote or hybrid
Eugene John Arellano
Cloud · AI Augmented · Full Stack · .NET Software Engineer
Results-driven software professional with 13+ years delivering high-quality, innovative enterprise solutions - aligning clean technical execution with measurable business value. 6× Microsoft Certified across Azure, AI and agentic development.
13+
years of experience
21+
project domains
6×
Microsoft certified
GMT+8
remote & async ready
// about
I build enterprise-grade software that's clean, reliable, and aligned with the business it serves - across the full stack, from database to UI.
Over more than 13 years I've delivered solutions across retail, healthcare, real estate, travel, finance, and beyond - most recently as a Senior Consultant on Azure engagements and, before that, three years leading full-stack delivery for an offshore consulting firm. My focus is solid architecture and maintainable code - SOLID, clean and vertical-slice architecture, modern .NET - now extended into applied AI: Azure OpenAI, RAG, grounding, and agentic workflows built on Microsoft Foundry with responsible-AI guardrails.
I mentor junior developers, run code reviews before merges, and write the handoff notes that stop knowledge walking out the door. I'm committed to continuous learning and staying ahead of emerging technologies, so the systems I build today are ready for tomorrow.
// expertise
A complete, modern toolkit
Thirteen years of hands-on engineering across architecture, applied AI, cloud, data, and the full front-to-back stack.
AI, Agents & LLM Engineering
22 capabilities · core focus
Generative AILarge Language ModelsAzure OpenAIAzure AI AgentsMicrosoft FoundryFoundry IQMicrosoft Agent FrameworkAgent2Agent (A2A)Model Context Protocol (MCP)MCP ToolsRAGGroundingPrompt EngineeringAI PromptsNLPAI Safety & GuardrailsResponsible AI GovernanceCopilot StudioGitHub CopilotClaude CodeChatGPTCursor
Architecture & Practices
22 competencies
SOLIDDRYKISSYAGNIDesign PatternsClean ArchitectureVertical SliceModular MonolithMicroservicesMonolithOOPOODOWASPRESTfulUnit TestingAgileScrumMVC PatternN-Tier / LayeredResilience PatternsIdempotencyAzure
Microsoft Azure - Cloud & AI Services
13 services
Azure App ServicesAzure FunctionsAzure SQL DatabaseAzure Blob StorageApplication InsightsAzure DevOpsAzure AI FoundryAzure Document IntelligenceAzure Content UnderstandingAzure VisionAzure SpeechAzure LanguageAzure OpenAI
Data, DevOps & Tooling
23 tools
GitGitHubAzure DevOpsBitbucketDockerPowerShellSQL ServerMSSQLT-SQLAzure SQLPostgreSQLEF CoreEntity FrameworkLINQDapperMediatRWolverineVisual StudioVS CodeGitHub CopilotCursorClaudeSQL
Frontend & Backend
20 technologies
C#.NET Core.NET FrameworkASP.NET CoreASP.NET MVCASP.NETPythonWeb APIRESTful APIAPI DesignWinFormsAngularVue.js 3TypeScriptJavaScriptjQueryChart.jsBootstrap 5HTMLCSS
// selected work
Projects across the years
A breadth of real-world systems delivered across industries — from point-of-sale and logistics to healthcare, real estate, travel, and insurance.
Retail
Cloud POS System
A cloud-native point-of-sale solution with multi-branch synchronization, offline-first resilience, and centralized sales reporting across all locations.
Retail
Inventory System
Real-time stock control with automated low-stock alerts, batch and SKU tracking, supplier management, and intelligent reorder automation.
Logistics
Warehouse System
A logistics and fulfillment system with bin-location tracking, optimized pick-and-pack routing, and coordinated dispatch operations.
E-Commerce
E-Commerce System
A full online storefront with product catalog, shopping cart, secure checkout, and complete order and fulfillment management.
Finance
Payroll System
An automated salary computation engine covering taxes, statutory deductions, payslip generation, and end-to-end payroll compliance.
HR
HR Management System
Centralized employee records, leave and attendance tracking, performance reviews, and streamlined onboarding workflows.
Scheduling
Appointment Scheduling
Calendar-driven booking with automated reminders, resource allocation, and conflict-free scheduling for staff and clients.
Operations
Queuing System
Customer flow management with digital ticketing, live queue displays, counter routing, and wait-time analytics.
Travel
Airline Booking & Reservation
Flight search, fare and seat management, reservation workflows, and booking confirmation across complex multi-leg itineraries.
Hospitality
Hotel Reservation System
Room availability, rate and inventory management, a real-time booking engine, and guest profile handling for hospitality operations.
Events
Event Ticketing System
Event setup, seat and ticket allocation, QR-coded ticket issuance, and real-time entry validation at the gate.
PropTech
Property Listing & Search
Real estate listings with advanced filtering, map-based search, saved searches, and rich, detailed property pages.
PropTech
Rental Management System
Lease lifecycle tracking, automated rent collection, maintenance requests, and self-service tenant portals.
PropTech
Tenant Screening Tools
Applicant background checks, credit and history evaluation, and risk scoring to support confident leasing decisions.
HealthTech
Electronic Health Records (EHR)
Secure patient records, clinical documentation, and care workflows built with healthcare data privacy and compliance in mind.
HealthTech
Medical Monitoring System
Real-time monitoring of patient vitals with threshold-based alerts, live dashboards, and instant clinician notifications.
EdTech
Library System
A catalog and circulation platform managing member records, borrowing and returns, due-date reminders, and fast title search.
EdTech
Online Examination & Assessment
Secure online exam delivery with question banks, automated grading, anti-cheating safeguards, and performance analytics.
Modernization
Legacy System Modernization
Re-architecting aging monolithic applications into modern .NET, clean architecture, and cloud-ready solutions — without disrupting operations.
Insurance
Insurance Systems
Policy administration and complex-risk handling across auto, homeowners (including wildfire-prone areas), construction, real-estate, and financial insurance.
// credentials
Certified & qualified
Six Microsoft and GitHub certifications backing real-world delivery, grounded in a computer science foundation — including AI-103, Microsoft's current Azure AI developer credential that succeeded the retired AI-102.
Click any credential to open its official Microsoft Learn verification page.
Azure Data Fundamentals — verify this credential on Microsoft Learn (opens in a new tab)
Microsoft Certified · DP-900
Azure Fundamentals — verify this credential on Microsoft Learn (opens in a new tab)
Microsoft Certified · AZ-900
Azure AI Fundamentals — verify this credential on Microsoft Learn (opens in a new tab)
Microsoft · AI-901 and AI-900
Azure AI Apps & Agents Developer — verify this credential on Microsoft Learn (opens in a new tab)
Microsoft Certified · AI-103
Agentic AI Business Solutions Architect — verify this credential on Microsoft Learn (opens in a new tab)
Microsoft Certified · AB-100
BS in Computer Science
STI College — Ortigas Cainta
Philippines
A computer science foundation underpinning 13+ years of hands-on, production software engineering.
// contact
Let's build something solid.
Hiring for a .NET, Azure or AI-augmented full-stack role? I'm open to full-time, contract and freelance work — remote or hybrid — and I overlap comfortably with APAC, EMEA and early US hours from GMT+8.
Typically replies within one business day.
Email
ej@ejarellano.com
Phone · WhatsApp · Viber
+63 917 876 8073
LinkedIn
in/ejm-arellano
GitHub
github.com/EJMARELLANO
Full CV
Download PDF résumé
Based in
Rizal · Pasig · Quezon City · Metro Manila, PH
Send a message
Tell me about your project and I'll get back to you by email.