Nicanor Alejandro Callo

Senior software developer with 12 years of professional experience, specializing in PHP backend development, REST API design, MySQL, and third-party integrations. Strong track record working with legacy and established codebases, building integrations between systems, and shipping features incrementally without disrupting production. Recent work emphasizes AI-assisted development workflows and integration of LLMs into production applications.

Full-Stack Developer at Argentiere Digital S.L. (2024-02 – 2026-04)

• Maintained and extended the REST API serving the website, mobile app, and admin panel. Added new endpoints, feature integrations, and supporting backend logic across all three consumers.
• Developed an AI-powered conversational discovery chatbot integrating Google Gemini 2.5 Flash with function calling for natural-language restaurant search.
• Built a rule-based recommendation engine using weighted preference scoring across user interaction data (saves, views, cuisine preferences, time-of-day patterns), with nightly cron jobs precomputing user profiles to keep request-time feed generation fast.
• Integrated CoverManager, LastApp, and Restoo reservation platforms with retry logic, request throttling, and scheduled synchronization to stay within rate limits.
• Implemented a bot-aware SEO architecture with server-side rendering, JSON-LD schemas, dynamic meta tags, and sitemap generation, measurably improving Google indexation and Core Web Vitals.
• Built analytics dashboards in the admin panel covering key performance indicators, engagement metrics, and active-user tracking.
• Shipped features and backend integrations for the React 18 + TypeScript website (Vite, Redux Toolkit, React Query, TailwindCSS) using AI-assisted development workflows.
• Contributed backend endpoints and debugging support for the companion React Native mobile app, ensuring feature parity across iOS and Android.
• Optimized image and video delivery through Cloudflare Stream.

Full-Stack PHP Developer at Maxo Telecommunications (2023-09 – 2024-01)

• Built and enhanced PHP APIs serving customer and reseller portals for an Australian telecommunications provider.
• Crafted optimized MySQL queries to handle extensive datasets across customer, reseller, and administrative systems.
• Integrated PHP applications with multiple external APIs to deliver enhanced functionality.
• Created and maintained brand-new point-of-sale software in PHP for a partner company.
• Upgraded an administrative portal to streamline staff workflows for client and ticket management.
• Collaborated remotely with Australian-timezone team members and customers to deliver on project goals.

Web Programmer at Pacific Sea BPO Services Inc. (2019-10 – 2023-09)

• Developed and enhanced an internal intranet system using the CodeIgniter MVC framework with MySQL database backend.
• Built responsive user interfaces using HTML, CSS, Bootstrap, jQuery, and AJAX for fluid client-side interactions.
• Evaluated user feedback and recommended new features for the existing intranet system, then implemented them through Agile development sprints.
• Created user documentation and provided ongoing support for users navigating new and improved modules.
• Used Git for version control as part of a collaborative team workflow.

Software Developer at Brightideas Information Technology Corporation (2018-10 – 2019-07)

• Developed responsive and dynamic web applications using the AngularJS framework.
• Built modular and reusable UI components using AngularJS directives and templates.
• Implemented form validation, data manipulation, and client-side routing using AngularJS controllers and services.
• Produced clear technical specifications and project documentation.

Junior Web Developer at Actino Inc. (2014-08 – 2017-10)

• Contributed to the development of Change4Win, a SaaS-based ERP system for organizational agility.
• Built ERP modules using PHP with the Smarty templating engine, MySQL, and jQuery for the front-end.
• Maintained ERP designs and coding standards, performed code reviews, and provided custom coding support.
• Diagnosed and repaired software defects across various modules and interfaces.

Junior Web Developer at AdgentDigital (2013-09 – 2014-07)

• Built a resume-building website using CodeIgniter and Bootstrap with database-backed user accounts.
• Tested, debugged, and modified existing code to add new features and resolve issues.

BS in Computer Engineering – Trace Computer College (2007 – 2012)