Technical SEO & Indexing
Site audits, crawl issues, canonicals, structured data, XML sitemaps, and on-page improvements using AIOSEO and Google Search Console.
Davao City, Philippines · Open to projects
Jhonsent Marilao, BSCpE
Senior Full-Stack Web Developer, AI & IoT Engineer
Building smarter systems through web development, AI, and IoT.
Building high-performance web systems, smart automations, and connected IoT solutions—backed by 12+ years of engineering experience.
- Experience
- 12+ years
- Focus
- Web, IoT & AI
- Based in
- Davao City, PH
- Availability
- Open to projects
Client Websites22 projects
A selection of websites I've built and maintained for businesses in Canada and the Philippines, from service companies and manufacturers to online stores.
Skedaddle Humane Wildlife Control
Wildlife control
Website development & ongoing maintenance (opens in a new tab)
Skedaddle Christmas Lights
Holiday lighting
Website development & ongoing maintenance (opens in a new tab)
McFarlane Trailer Sales
Trailer dealer
Website development & ongoing maintenance (opens in a new tab)
Millroad Trailers
Trailer manufacturing
Website development & ongoing maintenance (opens in a new tab)
Truly Nolen Canada
Pest control
(opens in a new tab)
Snow Tech
Snow removal and landscaping
(opens in a new tab)
Wellesley ABC Festival
Community festival
(opens in a new tab)
Martin's Tree Service
Tree care
(opens in a new tab)
Colonial Acres Coins
Coins and collectibles store
(opens in a new tab)
Dropkick Math
Homeschool resources
(opens in a new tab)
Canadian Plastics PVF
Industrial valves and piping
(opens in a new tab)
Graffitees Apparel Co.
Custom apparel store
(opens in a new tab)
PSO Accounting Group
Accounting firm
(opens in a new tab)
Allcard
Manufacturing
(opens in a new tab)
Carteplus Inc.
Manufacturing
(opens in a new tab)
KinsBrae Packaging
Packaging solutions
(opens in a new tab)
Pure Hair StudioHair salon (opens in a new tab)
Latitude PropertiesProperty management (opens in a new tab)
Fisherman’s CoveCamping resort & RV park (opens in a new tab)
Maggy MaidHouse cleaning services (opens in a new tab)
PSO Accounting GroupAccounting & business compliance (opens in a new tab)
LanguexProfessional translation services (opens in a new tab)
22 client websites
And many more.
Client feedback
What Clients Said About Working With Me
Feedback on website development, ongoing support, and optimization.
Recent client feedback
Thank you sir for creating me four websites as part of my strategic marketing. Appreciate your sincere support and consistent timely response. Continue to provide value to your most important asset, your client.
One of the biggest things about Jhonsent is that he spent time teaching me what was happening. I’m not super technical, so knowing/learning about the technicalities made me really understand the behind the scenes.
Fantastic freelancer. He will give 110% effort to every task. Jhonsent is a pleasure to work with and is such a nice guy. I would really recommend him to anyone.
Second time working with Jhonsent and did an amazing job helping me move my site, clean up database and help with optimizations...
Well done and completed within the agreed timeline. I will get engage him for future jobs.
Couldn’t have asked for more. Jhonsent was a breeze to work with.
Great work! We’ll work again in the future. Highly recommended!
Excellent developer & good in communication also.
Great knowledge and experience.
Review 1 of 9
About
Senior Full-Stack Web Developer & Computer Engineer
Based in Davao City, Philippines
I help businesses build high-performing websites, connect hardware with software, and turn complex requirements into reliable, practical tools.
My expertise spans custom web and mobile applications, WordPress and e-commerce, technical SEO, workflow automation, and IoT systems. I combine custom APIs, Git, and AI-assisted workflows—including Claude Code, Codex, and MCP tools—with hands-on development, testing, and review.
My career history and technical skills are detailed further down the page.
Intelligence, integrated
AI Is at the Core of How I Work
AI is more than an add-on to my workflow—it's an integral part of how I plan, develop, optimize, and deliver solutions. I combine AI tools with my technical expertise to build smarter systems, accelerate development, and help businesses achieve more with less manual effort.
Build Faster, Work Smarter
I use AI-assisted development, debugging, code reviews, and testing to streamline workflows, solve technical problems, and deliver reliable websites and applications more efficiently.
Smarter SEO, Better Visibility
I leverage AI for keyword research, content optimization, technical SEO analysis, and performance improvements to help websites strengthen their search visibility and attract relevant traffic.
Automate and Innovate
I build practical AI-powered solutions that connect systems, automate repetitive tasks, generate reports, summarize data, and deliver intelligent alerts—turning time-consuming processes into streamlined workflows.
Technical SEO & AutomationSearch visibility / site health / smarter workflows
I help businesses make their websites easier to find, faster to use, and simpler to maintain. My work combines hands-on technical SEO with reporting and automation that make the next action clear.
Website Performance
WordPress speed optimization, mobile usability, and PageSpeed Insights analysis to identify and resolve performance bottlenecks.
Search Reporting & Automation
Search Console and GA4 reporting, keyword opportunities, and connected workflows that turn website data into practical priorities.
Website Auditing Toolkit
DAXKODE SEO
Practical Website Checks, Clear Findings & Next Steps
A website auditing toolkit I built to bring SEO checks, responsive previews, social sharing metadata, and structured data validation into one place. It helps turn a public page URL into findings and practical recommendations.
Designed for focused, single-page reviews, the toolkit makes it easier to understand what needs attention and decide what to improve next. Downloadable PDF reports keep findings and recommendations ready to share.
- SEO Scanner: review 45 core on-page and technical checks with observed evidence and practical recommendations.
- Responsive Checker: preview a page at four screen sizes to review its responsive layout.
- Open Graph Validator: check metadata used for social sharing previews.
- Schema Markup Validator: inspect a page’s structured data.
- Optional Broken-Link Checks: check up to 20 linked URLs alongside the page audit.
PHP · MySQL · JavaScript · Technical SEO · PDF Reports
Open DAXKODE SEO (opens in a new tab)
Featured web application
Web Performance Tracker
Franchise page workflows, technical SEO & performance monitoring
A shared workspace that brings franchise campaigns, location-page production, website health, and search performance together. Built to coordinate the people and systems behind a growing network of location pages.
Teams can follow each page from planning and writing through development, SEO review, QA, and sign-off. Assignments and activity records keep responsibilities visible, while campaign details and franchise agreements stay connected to the work.
Search Console and Analytics reporting sit alongside indexing checks, page-speed findings, and keyword opportunities. Weekly reports bring those signals together to help the team decide which pages need attention next.
- Production workflows: planned-to-live page stages, assignments, Dev → SEO → QA → sign-off checklists, and activity logs.
- Search intelligence: Search Console and Analytics reporting, technical site audits, page-speed checks, and keyword opportunities.
- Team operations: campaign packages, franchise-specific agreements, shared updates, and weekly reports.
- Scheduled automation: weekday data refreshes, daily GitHub backups, and stale-data warnings. Website and Google integrations are read-only.
- Project scope: designed to coordinate 73 franchises and 587 location pages.
Web application · Workflow automation · Google integrations · Technical SEO
Client branding anonymized for this portfolio preview.
View Case Study: Web Performance TrackerMobile ApplicationsPractical tools for real-world activities
Mobile app · Badminton session management
CourtCraft Admin
An offline Android app that helps badminton organizers manage players, courts, and doubles matches. It prioritizes balanced teams and fair rotation, supports advance queues while players are still playing, and checks player and court availability before starting matches.
- Adaptive matchmaking rating (MMR): Player ratings adjust with wins and losses to help match players at appropriate skill levels and create more balanced games.
- Player profiles with skill stars, custom team selection, and fair rotation.
- Live rankings, podiums supporting tied winners, and shareable final results.
- Session data stored locally and restored when the app reopens.
- Implemented scope: four courts, advance doubles queues, adaptive MMR, and locally restored sessions.
React Native · React · Expo · TypeScript · SQLite · Android
Tools and Technologies
- App
- React Native, React, Expo and TypeScript
- Database
- SQLite through Expo SQLite
- Graphics and sharing
- React Native SVG, React Native Share and Expo FileSystem
- Development
- Node.js, npm and PowerShell
- Testing
- Node.js test runner, TypeScript checks, Expo Doctor and Expo Go
- Android packaging
- Expo EAS Build
Desktop & Business ApplicationsEarlier software projects
RDL Ambassador & Ambassadress 2014 · A Pageant for a Cause
Automated Pageant Scoring & Tabulation
A scoring system built with Delphi and SQL Server. Judges entered scores through the system, which automatically calculated and printed the results.
Delphi · SQL Server
Desktop application · Translation workflow
Language Translation Memory System
Built for a group of translators using Visual Studio C# and MySQL. The system reads Word documents, separates their contents into statements, and looks up translations stored in a shared database. Translators supply missing translations, which are saved for reuse.
C# · Visual Studio · MySQL
Proposed project · Bureau of Customs, Port of Davao
Export Record Management System
A proposed C# and SQL Server system for monitoring export transactions and generating monthly reports. It supported manual data entry or uploaded data, with reports in PDF, Word, or Excel format.
C# · Visual Studio · SQL Server
IoT & Engineering ProjectsFrom physical sensors to useful software
I build connected systems for government offices, businesses, and schools: collecting field measurements, connecting devices to APIs and databases, and making the data useful through dashboards, mobile apps, alerts, and reports.
- Sensors & metersArduino and connected devices
- API & databaseCollect and store readings
- Web & mobileMonitor and explore data
- Alerts & reportingTurn readings into action
Flood monitoring system
HydroWatch
MDRRMO · Municipal Disaster Risk Reduction and Management Office
Field sensors send rainfall and water-level readings to a server. The web dashboard brings monitoring locations together, showing readings, trends, and warning levels to support early disaster response.
- Multiple monitoring stations, with timestamped rainfall and water-level readings.
- Color-coded normal, alert, pre-emptive, and assisted-evacuation levels.
- Map and report views, with automatic alerts when water levels rise.
Arduino · API integration · PHP · MySQL · Web dashboard
Dashboard screenshot shown for demonstration. The operational application is not linked publicly.
View Case Study: HydroWatch
Power monitoring system + Android app
Saitech Power
Saitech Power Corporation
A connected power-monitoring system that sends readings from a Schneider Electric PM2120 power meter through an Arduino Uno R4 WiFi to a PHP/MySQL backend hosted on GoDaddy, with an Android app that puts the data on a phone. It helps users inspect live electrical measurements and review usage over time to identify waste and support cost decisions.
- Device management with device codes and favorites.
- Voltage, current, active/reactive/apparent power, power factor, frequency, harmonics, and energy readings.
- A dashboard for selected measurements, plus reports filtered by category and date.
- CSV export for further analysis and audits.
- Delivery evidence: the companion Android app is available on Google Play.
Schneider Electric PM2120 · Arduino Uno R4 WiFi · PHP · MySQL · GoDaddy hosting · Android
View on Google Play (opens in a new tab) View Case Study: Saitech Power
Earlier engineering projects
Arduino · Remote control
Smart Home Lighting & Appliances
A mobile app for controlling six home lights, an air conditioner, and other appliances over an internet connection. Arduino connected the app controls to the home devices.
The phone provided a single interface for operating the connected lights and appliances remotely. The project linked mobile software with an Arduino controller so an action in the app could control a physical device in the home.
Project focus: mobile-to-hardware communication, internet-based appliance control, and connecting everyday home devices to a shared interface.
Arduino · Feeding & water changes
Smart Aquarium Automation
An app-controlled ornamental fish tank system for remote feeding and percentage-based water changes. Selecting a change such as 50% drains that portion of the tank, then refills it using water pumps and a refill reservoir maintained by a float mechanism.
The project brought feeding and water replacement into one mobile interface. Arduino connected the app commands to the feeding mechanism and pumps, linking the selected water-change amount with the drain-and-refill process.
Project focus: app-controlled feeding, pump operation, and a coordinated water-change workflow.
Award-winning college engineering thesis · Mini PC & electronics
Automated Parking Security
College engineering thesis · Team programmer
This team project won Champion at the Mindanao Institute of Computer Engineering Thesis Competition. I served as the team’s programmer. The judging panel included members of the Davao Inventors Club, engineering instructors, and engineers.
A mini PC processed camera input, stored entry records, and automatically matched vehicle number plates and driver faces at exit. Matching records opened the barrier through electronic controllers; mismatches triggered alerts and a siren.
Arduino · Coin counting · SMS alerts
Automatic Coin Counter & SMS Alerts
Public toilets at Davao City’s major public markets
An Arduino-based monitoring system for a coin-operated turnstile. It counts deposited coins, tracks the total collection value, and uses an SMS module to send the coin count and amount to the operator.
When the coin box is nearly full, the system sends an SMS collection alert so the operator can empty it.
The operator could also check the current coin count by SMS. This combined collection monitoring with a remote way to check the box, alongside the automatic notification when it needed attention.
Programmable IC · Servo motors · Sensors
Cartesian Robotic Arm
Holy Cross of Davao College · Science and technology fair
A Cartesian robotic arm built for the college's science and technology fair. The project combined a programmable IC, servo motors, sensors, and electronic components to control movement across a gantry-style mechanism.
The robot could lift and transfer objects through direct control or its machine-control mode. A PIC16F84A programmable IC worked with the servo motors, sensors, and electronic components to control the mechanism.
Project focus: embedded programming, motion control, and integrating electronics with a working mechanical structure.
ExperienceA career built on delivery
Senior Full-Stack Web Developer
2018 – PresentUnwired Web Solutions
- Develop, customize, and maintain WordPress websites for international clients, including service businesses, manufacturers, and e-commerce companies.
- Build custom WordPress themes, templates, and functionality using PHP, Advanced Custom Fields (ACF), Genesis Framework, Elementor, JavaScript, and MySQL.
- Troubleshoot and resolve complex website issues involving functionality, performance, security, plugin conflicts, and database errors.
- Develop and maintain e-commerce solutions using WooCommerce, Shopify, and Volusion, including customizations and third-party integrations.
- Implement technical SEO improvements, structured data, website optimization, and integrations with Google Search Console, Google Analytics, and Google Business Profile.
- Provide technical guidance and troubleshooting support to junior developers, helping resolve development challenges and maintain code quality.
- Integrate AI-assisted development workflows using Claude Code, Git, and MCP tools to streamline coding, debugging, and website maintenance while reviewing and validating changes before deployment.
Software Developer – Mobile Applications
May 2018 – February 2019Besquare · Full-time
- Mobile App Development: Engineered and designed mobile applications from concept to deployment, ensuring responsive performance and intuitiveness.
- UI/UX Design & Implementation: Designed user interfaces and workflows optimized for mobile devices, aligning functional requirements with user needs.
- Cross-Platform & Full-Lifecycle Support: Supported full-lifecycle application delivery across mobile platforms, integrating APIs and maintaining high code quality.
ASP.NET Developer
2017 – 2018Michody, LLC
- Web Application Engineering: Built and optimized dynamic web applications using ASP.NET, improving system efficiency, backend performance, and user interface responsiveness.
- Single Sign-On (SSO) & Authentication: Designed and implemented a universal login portal dashboard, providing centralized Single Sign-On (SSO) authentication for seamless access across multiple platforms.
- Media Streaming Solutions: Developed a feature-rich online radio streaming web application, managing real-time audio playback and smooth user interactions.
Instructor
2014 – 2017Philippine College of Technology
- Instruction & Curriculum Delivery: Delivered theoretical and hands-on courses across IT, Engineering, and Mathematics, including specialized training in Robotics, AutoCAD, and TESDA Computer Qualification Modules.
- Hands-on Technical Training: Mentored students in practical laboratory exercises, bridging academic concepts with real-world technical and engineering applications.
- Laboratory & Network Administration: Maintained and serviced computer laboratories, managing hardware repair (PCs, printers), network troubleshooting, and infrastructure uptime to ensure smooth operations.
System Developer (Delphi & PLC)
2014 – 2015Digilution
- Software Development: Developed, optimized, and maintained desktop applications using Delphi, significantly improving system performance, overall efficiency, and user experience.
- Automation & Industrial Control: Served as a key technical staff member on high-stakes automation projects, including control systems for the Mt. Apo Geothermal Power Plant.
- PLC Programming: Designed and deployed Ladder Logic programming for Programmable Logic Controllers (PLCs) to automate industrial control processes.
Training & WorkshopsSharing engineering through hands-on learning
Guest Engineer · Six-hour workshop
Arduino Training
Mapúa Malayan Colleges Mindanao
Shared computer engineering concepts through six hours of hands-on Arduino training, connecting theory with circuit-building and practical exercises.
Arduino · Electronics · Computer engineering · Teaching
Robotics workshop · 2015
Arduino Robotic Arm Workshop
Philippine College of Technology
Taught students how to build a robotic arm and control its movement using Arduino, combining hands-on hardware assembly with programming and electronic control.
Arduino · Robotics · Hardware control · Teaching
Summer class · Hands-on robotics
Basic Robotics Summer Class
Philippine Science High School students
Facilitated a summer class held at Philippine College of Technology (PCT), introducing students to basic electronics, robotics, and Arduino programming through hands-on activities.
For their final project, students built and programmed a line-following robot that detects and follows a black line.
Arduino · Basic electronics · Robotics · Line-following robot · Teaching
Skills
CMS and E-Commerce
- WordPress
- Genesis Framework
- Elementor
- Shopify
- Volusion
Front End
- HTML and CSS
- JavaScript
- Responsive design
- Theme customization
Back End
- PHP
- MySQL and SQL Server
- ASP.NET
- API integration
IoT and Hardware
- Arduino
- IoT sensors and devices
- Real-time data collection
- Device-to-web integration
AI and Automation
- AI-assisted development
- AI for SEO and content
- AI integration
- Automated alerts and reports
Data and Dashboards
- Data dashboards
- Real-time reporting
- Charts and analytics
SEO and Search Rankings
- Search engine optimization (SEO)
- Technical SEO
- On-page SEO
- Local SEO
- Keyword research
- Schema markup
- XML sitemaps and indexing
- Site speed optimization
- Google Search Console
- Google Business Profile (GMB)
- Google Analytics (GA4)
- Google PageSpeed Insights
- Yoast SEO
- AIOSEO
Education
BS Computer Engineering
2008 – 2013Holy Cross of Davao College
Professional Development
Agentic AI Masterclass
Techademy
Certificate of Participation
View Certificate (PDF, 292 KB; opens in a new tab)Trainers Methodology Certificate I
IssuedTESDA · Technical Education and Skills Development Authority
Computer Systems Servicing NC II
IssuedTESDA · Technical Education and Skills Development Authority
Computer Hardware Servicing NC II
IssuedTESDA · Technical Education and Skills Development Authority
Let’s build something
Have a Project in Mind?Let’s Make It Happen.
Whether you need a better website, smarter workflows, or a connected device, I can help turn your idea into a practical solution.
What Happens Next
- Share your idea
- Discuss the scope
- Agree on the next steps
Davao City, Philippines Working with clients worldwide
