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
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CONTACT
Let's build something sharp
Reach out for product strategy, architecture, delivery leadership, or execution support for web, mobile, and AI initiatives.