Davao City, Philippines · Open to projects
Jhonsent Marilao, BSCpE
Building smarter systems through web development, AI, and IoT.
I’m Jhonsent Marilao, a Computer Engineer with 12+ years of experience in IT and software development. I specialize in custom WordPress websites, full-stack web solutions, technical SEO, AI-powered automation, and IoT engineering.
Client feedback
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!
An exceptional developer with outstanding communication skills. Highly proactive, clear in their updates, and delivers top-tier technical work.
Demonstrates exceptional technical knowledge and deep experience in Web Development and SEO. Combines strong technical expertise with a great attitude, clear communication, and an efficient, client-focused workflow.
Based in Davao City, Philippines, I bring 12+ years of hands-on development and engineering experience to websites, applications, and connected systems.
I currently work as a Senior Full-Stack Web Developer at Unwired Web Solutions.
My expertise spans WordPress and e-commerce, custom web and mobile applications, technical SEO, workflow automation, and IoT systems. I use PHP, JavaScript, MySQL, custom APIs, Git, and AI-assisted workflows with hands-on testing and review.
I am open to website builds, ongoing website care, and long-term technical contracts. My career history and technical skills are detailed further down the page.
Practical development and ongoing support for your next website or existing platform.
Custom WordPress themes, templates, and functionality built with PHP, JavaScript, and MySQL. Responsive layouts, editable content, e-commerce features, and clear calls to action help turn business requirements into a practical website.
Page titles, indexing, canonicals, structured data, and site-health checks, alongside Core Web Vitals analysis and speed improvements. Clear findings and practical recommendations help prioritize the changes that matter.
Ongoing WordPress core and plugin updates, site-health checks, troubleshooting, security hardening, and scheduled backups with recovery planning. Monthly care keeps routine maintenance organized and issues visible.
Custom web and mobile applications, API integrations, reporting tools, and workflow automation. Arduino and connected-device projects bring hardware, software, and useful data together.
Intelligence, integrated
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.
I use AI-assisted development, debugging, code reviews, and testing to streamline workflows, solve technical problems, and deliver reliable websites and applications more efficiently.
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.
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.
A salon website design with service menus, photography, and a responsive layout.
A healthcare website design with service information and an appointment inquiry layout.
Scroll Inside a Device to Explore
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.
Site audits, crawl issues, canonicals, structured data, XML sitemaps, and on-page improvements using AIOSEO and Google Search Console.
WordPress speed optimization, mobile usability, and PageSpeed Insights analysis to identify and resolve performance bottlenecks.
Search Console and GA4 reporting, keyword opportunities, and connected workflows that turn website data into practical priorities.
Website Auditing Toolkit
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.
PHP · MySQL · JavaScript · Technical SEO · PDF Reports
Open DAXKODE SEO (opens in a new tab)
Featured Web Application
Website performance, technical SEO & automation
A web application that brings website performance information and technical SEO tools together in a shared interface.
I developed application features and responsive interfaces, using automation to support routine technical work and help make website information easier to review.
Web Application · Technical SEO · Responsive Design · Automation
Discuss Your Project
Mobile app · Badminton session management
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.
React Native · React · Expo · TypeScript · SQLite · Android
RDL Ambassador & Ambassadress 2014 · A Pageant for a Cause
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
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
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
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.
Flood monitoring system
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.
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 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.
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
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
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
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
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
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.
Unwired Web Solutions
Besquare · Full-time
Michody, LLC
Philippine College of Technology
Digilution
Guest Engineer · Six-hour workshop
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
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
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
Techademy
Certificate of Participation
View Certificate (PDF, 292 KB; opens in a new tab)TESDA · Technical Education and Skills Development Authority
TESDA · Technical Education and Skills Development Authority
TESDA · Technical Education and Skills Development Authority
Explore what to consider when planning a business website, from WordPress and technical SEO to performance and ongoing maintenance.
Read the Website Planning GuideI build and maintain WordPress websites, custom web applications, and e-commerce solutions. I also help with technical SEO, website performance, and ongoing maintenance.
Yes. I’m based in Davao City, Philippines, and work with clients worldwide. We can discuss the project scope and communication arrangements before getting started.
Yes. I can help troubleshoot issues, improve website performance and technical SEO, and support ongoing website maintenance.
My work includes custom web and mobile applications, workflow automation, and IoT projects that connect hardware with software and useful data.
The cost depends on the scope, design, features, and support needed. Share your requirements and I can discuss an estimate based on the project.
Yes. I offer small-business website packages that include creating your website, hosting, and a domain name, with yearly renewal. I’ll discuss the package, pricing, and renewal details with you so you can focus on running your business.
I can review loading performance and identify practical improvements, such as optimizing images and addressing unnecessary scripts. Results vary with the website, hosting, and tools involved.
I can help investigate website security issues and discuss cleanup, recovery, and hardening based on the situation. The work needed depends on the access available and the nature of the issue.
Yes. Website care can include updates, backups, site-health checks, troubleshooting, and performance monitoring, depending on the agreed scope.
I can help improve technical SEO and make website content clearer and easier for search engines to access and understand. These foundations can also support answer and AI-powered search experiences, though visibility and rankings cannot be guaranteed.
My IoT work includes Arduino-based systems that connect sensors, devices, and software. ESP32 requirements can be discussed based on the project’s needs and scope.
Yes. My experience includes mobile application development and Android projects. We can discuss the devices, features, and integrations your app needs.
I use AI-assisted tools to support development, debugging, research, and routine tasks. I review and test the work as part of the development process.
Yes. I conduct training and seminars in programming, computer networking, electronics, Arduino, and robotics. I also provide TESDA Computer Systems Servicing NC II training. I previously taught IT at the Philippine College of Technology and conducted online Arduino training for students from Mapúa Malayan Colleges Mindanao.
Let’s build something
Whether you need a better website, smarter workflows, or a connected device, I can help turn your idea into a practical solution.
Davao City, Philippines Working with clients worldwide
