Gabriel Castro

Full Stack Software Engineer

I build enterprise-grade systems end-to-end — from payroll engines and HRIS platforms to real estate CRMs and cloud infrastructure.

3+Years Experience
5+Projects Shipped
PHP & TSPrimary Stack
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About

I'm a Full Stack Software Engineer based in Pampanga, Philippines with 3+ years of experience designing and building enterprise systems end-to-end. I've shipped everything from HRIS and payroll engines to ticketing platforms and cloud infrastructure — always with a focus on performance, reliability, and clean architecture.

Experience

Software Engineer • Clark Outsourcing

Pampanga, Philippines

May 2023 – Present

  • Architected end-to-end Ticketing System (form builder, workflow engine, task management, reports) used company-wide — reduced manual process handling by 80% via automated routing and real-time status tracking.
  • Led frontend across 3 Angular portals (Employee, Admin, Payroll) spanning 7 systems — NgRx state management, role-based rendering, real-time notifications, dynamic form builder, ApexCharts analytics.
  • Maintained shared-database service architecture across 8 API applications with REST inter-service communication and async processing via Laravel Queues + AWS SQS.
  • Built payroll engine with automated BIR tax computation, statutory contributions, configurable loan deduction system — 99.9%+ accuracy validated via audit reports.
  • Built Event Management System with gamified participation tracking — 65% increase in employee engagement.
  • Optimized API performance from 5s+ → under 2s via SQL optimization, DB indexing, Redis caching, read replica routing, CloudFront CDN.
  • Owns all AWS infrastructure via Terraform + Terragrunt — Elastic Beanstalk, RDS, SQS, CloudWatch with correlation ID tracing across all services.
  • Established CI/CD via AWS CodePipeline + GitHub across dev, staging, production.

Projects

Ticketing & Helpdesk System

Enterprise-wide request management with dynamic form builder, configurable workflow engine, automated routing, real-time status tracking, and cross-department collaboration.

Impact

80% reduction in manual process handling

Architecture

Shared-database multi-service Laravel backend, Angular SPA, SQS async processing

AngularLaravelMySQLRedisAWS SQSNgRx
Private — Clark Outsourcing

Payroll System

Full-cycle payroll engine covering BIR tax computation, SSS/PhilHealth/Pag-IBIG contributions, and configurable loan deduction with employee self-settlement via payroll cutoff.

Impact

99.9%+ payroll accuracy validated through audit reports

Architecture

Rule-based computation engine, background job queue for batch processing, audit trail logging

AngularLaravelMySQLLaravel QueuesAWS SQS
Private — Clark Outsourcing

HRIS & Performance Management

Integrated HR platform covering employee records, onboarding workflows, leave management, and a performance review cycle with configurable KPIs and manager calibration.

Architecture

Multi-portal Angular apps (Employee + Admin), shared Laravel API, role-based access control

AngularLaravelMySQLNgRxApexCharts
Private — Clark Outsourcing

Event Management System

Company event platform with pre-registration flows, gamified participation tracking, attendance QR scanning, and post-event analytics dashboards.

Impact

65% increase in employee participation

Architecture

REST API backend, real-time notifications via Firebase, event-driven participation scoring

AngularLaravelNgRxMySQLApexCharts
Private — Clark Outsourcing

Real Estate Management System & CRM

A comprehensive platform for brokers and agents to manage properties (rent, buy, auction) and capture leads from interested buyers and property appraisals. Features an integrated CRM for managing client relationships, tracking agent commissions and activity logs, and a built-in CMS for publishing real estate articles.

Impact

Streamlined broker operations and centralized lead management

Architecture

NestJS backend providing secure RESTful services, React frontend for responsive user interfaces, PostgreSQL for robust data integrity.

Next.jsNestJSPostgreSQLCRMCMS
Freelance Project

Skills

Frontend

TypeScriptJavaScriptAngularReactNext.jsTailwind CSSBootstrapSCSS

Backend

PHPNode.jsPythonJavaLaravelNestJSDjangoREST APIsJWTOAuth

Databases

MySQLPostgreSQLDynamoDBFirebase

DevOps & Cloud

AWSTerraformTerragruntAWS CloudFormationGitHub ActionsAWS CodePipelineDockerAWS CloudWatch

Tools

GitGitHubVS CodeJIRA

Contact

Email
LinkedIn
GitHub
WhatsApp
Viber