PHP 100,000+
Full-Stack Web & Mobile Development
End-to-end product delivery for web and mobile apps, from architecture and UI implementation to API integrations and production release.
JOHN ERNEST
Tech Strategy & Delivery Lead
Product-minded full-stack and mobile engineer focused on scale, speed, and measurable outcomes.
STRATEGYDESIGNDEVELOPMENT
INTRODUCTION
Building high-impact
digital products
Hi, I'm a Senior Full-Stack Web & Mobile Developer with 13+ years of experience helping startups and enterprises ship scalable, AI-powered products. I lead architecture, execution, and delivery from concept to launch.
Trusted by founders, agencies, and enterprise teams
SERVICES
Engagement Options
Flexible service offerings for founders and teams needing delivery speed, strong architecture, and reliable implementation quality.
PHP 180,000+
MVP Build Sprint
Rapid MVP build designed for startup validation, focusing on must-have functionality and launch speed.
PHP 65,000+
AI Feature Integration
Integration of practical AI features such as summarization, speech workflows, and content generation into existing products.
PHP 60,000+ / month
Fractional CTO / Delivery Advisory
Strategic technical leadership for planning, team guidance, architecture governance, and execution oversight.
PHP 45,000+
Architecture & Codebase Audit
Deep technical review of code quality, architecture, performance, and release risks with practical remediation guidance.
Personal Warranty
8-week personal warranty after launch for any bug found that is within the initial agreed requirements and scope.
CAPABILITIES
Resume Highlights
Software Development
Android (Kotlin, Java), iOS (Swift, ObjC), Xamarin, C#, .NET MAUI, React Native, RESTful APIs, Realtime Apps, Next.js, AngularJS, ReactJS, NodeJS, AWS, Firebase, Supabase
DevOps
GitHub Actions, Firebase Distribution, TestFlight, AppCenter, Diawi, Gradle, YML, Robotium, Spoon, Espresso
Version Control
SourceTree, GitHub, BitBucket, code review practices, and pull request resolution
3rd Party Integrations
Social media integration, payment processors, marketing and analytics SDKs, media processing, maps and location services
Org & Collaboration Tools
JIRA, Trello, Azure, Slack, Teams, Asana, Google Workspace, Dropbox, TeamViewer, Skype, Monday
AI & INNOVATIONS
- Integrated AI solutions using Vertex AI and OpenAI APIs including text-to-speech, speech-to-text, media intelligence, and generative content workflows.
- Built prompt engineering flows and backend pipelines to improve AI cost-efficiency, performance, and product flexibility.
- Developed a custom Vertex AI model for personalized recommendations and stronger user engagement.
- Advised non-technical stakeholders on practical AI implementation trade-offs and opportunities.
CAREER TIMELINE
Fractional CTO | Solution Architect | Technology Consultant
Upwork (2013), Toptal (2015)
2013 - Present
Provide end-to-end technology leadership for startups and digital businesses, acting as fractional CTO across multiple client engagements. Architect scalable systems, build cross-platform applications, and implement structured delivery processes from ideation through launch and iteration. Lead hiring, vendor coordination, and developer mentorship to ensure consistent quality and execution. Help founders reduce technical risk, manage scope, and build sustainable product foundations that support long-term growth.
Senior Fullstack Developer
Bond Software Inc.
May 2025 - Present
Lead full-stack development across web and mobile platforms for enterprise-grade healthcare and membership systems, including TrustHealth. Architected scalable Next.js + Directus web applications and React Native mobile apps, integrating secure APIs, real-time features, and multi-environment deployments (dev/qa/uat/prod). Responsible for backend API design (.NET), database modeling, CI/CD pipelines, environment configuration, and performance optimization. Collaborate closely with designers, QA, and product stakeholders to deliver high-reliability systems used by large member bases. Drive technical decisions, mentor developers, and ensure clean, maintainable architecture across multiple client projects.
Associate Manager
Ernst & Young GDS Philippines
January 2020 - May 2025
Designed and developed applications tailored to client needs, collaborating with software architects and project managers on solution design and architecture planning. Provided end-to-end consultancy, including issue resolution and project oversight.
Senior Mobile Developer
Navitaire (via NTT Data Philippines)
January 2019 - January 2020
Contributed to Cebu Pacific's mobile app with key features including CEB Flexi. Worked across feature delivery, bug maintenance, and Agile ceremonies while building cross-platform capability in Xamarin C#.
Senior Android Developer
Inovotek Apps Inc.
November 2016 - November 2018
Rebuilt the flagship app from the ground up with modern frameworks. Led architecture discussions with executives, mentored team members, and integrated services such as Firebase, Realm, Parse, and PubNub for scale and reliability.
Senior Android Developer
Samsung Mobile R&D Philippines
June 2016 - November 2016
Maintained and improved assigned applications while spearheading a test automation framework using Espresso to improve development speed and product stability.
Software Engineer II
KLab Cyscorpions Inc.
2013 - 2016
Progressed from beginner to key contributor, leading upgrades, code reviews, and test automation with Robotium and Spoon while mentoring junior developers.
PROJECTS
Selected Work
Browse case highlights by domain and tech stack to quickly find relevant project experience.
Domain
Tech Stack
18 results
DURA LEX
Legal Information & Search Platform
AndroidiOSReactNodeJSPuppeteerPostgreSQLAlgolia SearchStripePayPal
Developed a sophisticated legal research platform focused on Italian and EY legal codes. Designed and implemented a web scraper using Puppeteer to aggregate legal data into a PostgreSQL database. Integrated Algolia for advanced search capabilities and subscription-based access via Stripe and PayPal. Delivered a powerful and efficient legal research tool.
LegalTechData AnalyticsSubscription Services
MyWapBlog
Mobile-First Blogging App
AndroidJava
Developed using Android Native, this app provided a seamless blogging experience with secure authentication and an advanced rich text editor as its core feature. It empowered users to create and manage content effortlessly while ensuring smooth performance on mobile devices. By enhancing user engagement and simplifying content publishing, it played a key role in the startup’s growth, attracting a wider audience and increasing platform retention through an intuitive and feature-rich experience.
Content ManagementBlogsDigital Media
PharmacyDirect
Medicine Delivery Platform
AndroidiOSFirebaseGoogle Maps APIGoogle Location API
Built a scalable medicine delivery platform for Android and iOS, integrating Firebase for real-time updates. Designed a seamless customer and driver experience with Google Maps tracking and geolocation services. Implemented push notifications to keep users informed about order progress, enhancing efficiency and reliability in pharmaceutical delivery.
DeliveryLocation TrackingNotifications
Appily
Emotion-based Journaling App
Android
Developed an innovative journaling app that provides real-time feedback based on detected emotions in user entries. Implemented keyword analysis to evaluate sentiment and generate insights. Designed intuitive animations and custom sticker packs to enhance user engagement and self-expression. Delivered a seamless and immersive journaling experience that encourages emotional well-being.
Mental HealthWellnessPersonal Developmen
PULIRE
Shoe Cleaning Service App
AndroidReactFirebaseReactJSNotifications
Engineered an on-demand shoe cleaning service with Android apps for customers and drivers. Built a ReactJS web portal for efficient admin management. Implemented an intelligent order assignment system that distributes requests to available drivers while ensuring timely updates through push notifications.
On-demand ServicesE-commerceLogistics
TARJEMLE
Translation & Copywriting Services
AndroidiOSNodeJSReactJSPostgreSQLOCRArabic Language SupportNotifications
Designed a full-scale translation and copywriting platform supporting clients, translators, and admins across Android, iOS, and web apps. Implemented OCR technology for text recognition, enhanced Arabic language support with RTL adjustments, and integrated email/SMS notifications for seamless workflow coordination.
TranslationLinguisticsContent Creation
InkMyPapers
Student Assignment Help Platform
AndroidiOSFirebaseReactJSMessaging Module
Engineered a multi-platform solution for students to receive academic assistance. Developed Android and iOS apps for order management, allowing students to place and track assignments. Built an admin web portal in ReactJS to facilitate staff assignment. Integrated an in-app messaging module to streamline communication between students and support staff, improving user satisfaction.
EducationE-learningStudent Services
ShawerApp
eLawyering Platform
AndroidiOSReactNodeJSStripe PaymentsNotifications
Created a digital legal services platform featuring Android, iOS, and web applications with multi-role access. Developed a NodeJS backend to handle payments, secure messaging, and case management. Integrated Stripe for in-app purchases, enabling clients to buy legal consultation credits. Provided robust notifications to ensure seamless lawyer-client interactions.
LegalTechFinTechProfessional Services
Guapp
Super App for Deliveries & Services
AndroidiOSReactJSNodeJS
Built a Grab-style super app featuring a multi-role web portal and mobile apps for customers and drivers. Implemented merchant inventory management, real-time sales tracking, and admin functionalities. Delivered a scalable and intuitive system for service bookings and deliveries.
E-commerceLogisticsSuper App
HubChart
Patient-Doctor Consultation Platform
Android
Developed a digital healthcare platform enabling secure patient-doctor consultations. Built an AI-powered messaging module with automated order detection to streamline communication between medical professionals. Optimized patient management workflows to enhance telemedicine efficiency.
HealthcareTelemedicineAI
Blockchain-based Supplier Certification App
Blockchain-Powered Supplier Verification
React NativeWalletConnect
Created a blockchain-based platform that verifies small-scale farmers and suppliers. Integrated WalletConnect for secure wallet authentication and built a verification system that allows food manufacturers to validate supplier certifications seamlessly.
BlockchainAgricultureSupply Chain
Basketball League App
Sports Team & Matchmaking Platform
React NativeGoogle Maps APIGoogle Location APIStripe
Designed a sports management app allowing users to create and join teams, track match history, and receive push notifications. Integrated map-based matchmaking, contract-based game organization, and secure payments via Stripe.
SportsRecreationPayments
Kage App
NFT Analytics & Crypto Wallet
React NativeNodeJS
eveloped an NFT analytics and crypto wallet app with React Native. Integrated Web3 wallet authentication and IcyTools for in-depth NFT analytics. Implemented a scheduling system for NFT drop tracking with calendar integration.
BlockchainFinTechNFT
Cebu Pacific
Airline Booking & Management
XamarinC#
Contributed to enhancing the Cebu Pacific mobile app built on Xamarin. Focused on bug resolution and feature improvements to optimize user experience and booking workflows.
TravelAviationMobile Apps
Vehicle Dealership Management App
Vehicle Inventory & Valuation
React NativeOCRBarcode Scanning
Developed a React Native app for managing vehicle inventories. Integrated barcode scanning and OCR-based VIN recognition for efficient data entry. Designed an automated valuation system using Kelley Blue Book data.
AutomotiveRetailData Analytics
BrainSnax
Corporate Podcast Training App
AndroidSharePoint IntegrationMedia Player Features
Built an Android podcast app for corporate training, integrating SharePoint as a content host. Developed a feature-rich media player with background playback, chapter segmentation, and bookmarking for enhanced learning experiences.
Corporate TrainingMediaEducation
Scripturely
Spiritual Content & Lectures
AndroidiOSReactJSNodeJSSpeech-To-Text
Created a digital platform for pastors to share sermons through a ReactJS web app. Implemented a robust Bible study module with search, bookmarking, and scripture highlights. Developed a podcast-like lecture player with push notifications for new content. Implemented Speech-To-Text for lectures to be read by different voices.
ReligionEducationMedia
My180
Insurance Quotation & Management
Xamarin.NET MAUIPowerBI Integration
Led the development of an insurance platform initially in Xamarin and later ported to .NET MAUI. Implemented role-based access for agents, customers, and executives. Integrated PowerBI for advanced analytics and reporting on insurance quotes.
InsuranceFinTechAnalytics
CONTACT
Let's build something sharp
Reach out for product strategy, architecture, delivery leadership, or execution support for web, mobile, and AI initiatives.