John

Full Stack Developer, Software Developer

John

ID Verified
1500/mo
General Trias, Philippines
Looking for Full-time
8 hours/day
Availability: US / EU / Asia timezone

Profile Description

Highly experienced and results-driven Full Stack Developer specializing in fast, scalable, and AI-powered web applications. Proficient in modern tech stacks, including React, Next.js, Node.js, and TypeScript, with expertise in designing responsive, SEO-optimized frontends. Skilled at developing secure, high-performance backend systems using Express, PostgreSQL, MongoDB, and Firebase. Committed to clean architecture, automation, and leveraging advanced technologies like real-time AI, voice proces...

Top Skills

AI Agent Development · 3 yearsAPI Integration · 3 yearsGitHub Copilot · 3 yearsHTML5/CSS3 · 3 yearsMongoDB · 3 years

Skills & Expertise

AI & Automation

GitHub CopilotAdvanced
n8nIntermediate
MidjourneyIntermediate
API IntegrationAdvanced
Workflow AutomationIntermediate
AI Agent DevelopmentAdvanced
OpenAI APIAdvanced
Speech RecognitionIntermediate

Software Development

ReactAdvanced
React NativeIntermediate
Next.jsAdvanced
Tailwind CSSAdvanced
Node.jsIntermediate
TypeScriptIntermediate
ZustandIntermediate
Redux/Context APIIntermediate

E-commerce & Marketplace

WooCommerceBeginner

Work Experience

Lead Full Stack Developer

Callexa

Jun 2025 - Sep 2025

Key Achievements:

Challenge: The organization required a real-time, sophisticated AI voice agent capable of immediate comprehension, understanding, and response. Implementation: Architected and implemented a complete real-time conversational AI bot utilizing Next.js, Node.js, Express, Twilio Media Streams, Deepgram, OpenAI, ElevenLabs, Supabase, and AWS/Vercel. Developed core logic for sentence boundary detection to ensure synchronized speech and seamless streaming responses. Engineered the Pathway Builder, a proprietary tool enabling users to define and customize conversational workflows without code. Designed and implemented a highly optimized bi-directional audio pipeline for low-latency live voice communication. Results: Successfully deployed a fully operational real-time AI voice system currently utilized for business process automation and enhanced customer service operations. Achieved a fluid, natural conversation flow characterized by minimal latency. Empowered businesses to construct bespoke voice workflows autonomously.

CI/CD PipelinesSupabasePostgreSQLGitHub ActionsVercelGitHub CopilotNext.jsSpeech RecognitionAI Agent DevelopmentWorkflow AutomationOpenAI APITypeScriptNode.jsTailwind CSSRedux/Context APIHTML5/CSS3AWS (EC2 S3 Lambda)

Junior Front End Developer

Servebeez

Mar 2025 - Jun 2025

Key Achievements:

Challenge: The existing platform required a modern, high-performance landing page and the optimization of administrative and service provider dashboard interfaces. Implementation: Spearheaded the design and development of the new landing page utilizing Next.js, ensuring optimal speed and responsiveness. Collaborated with lead developers to significantly enhance the usability and workflow of the provider and admin dashboards. Operated within a monorepo structure encompassing the API, admin, provider, and landing modules to maintain consistent version control and streamline deployment. Leveraged the T3 Stack (Next.js, TypeScript, Tailwind, tRPC) and Supabase to facilitate rapid, scalable application development. Results: Successfully delivered a highly optimized landing page, leading to improvements in page speed metrics and user engagement. Achieved greater dashboard operational efficiency, resulting in smoother day-to-day business processes. Enhanced overall platform maintainability through the implementation of superior structural organization and strict type safety.

API IntegrationNext.jsTypeScriptNode.jsTailwind CSSPostgreSQLSupabasetRPCVercel

Full Stack Developer

Freelance Project

Jun 2024 - Jan 2025

Key Achievements:

Challenge: The client required a comprehensive, automated system for end-to-end attendance tracking, precise payroll computation, and efficient employee notification management. Implementation: Architected and deployed a full-stack platform utilizing Next.js (frontend), Node.js and Express (backend), hosted on AWS EC2. Secured the application through the implementation of JWT (JSON Web Tokens) in conjunction with OAuth 2.0 for robust authentication. Integrated third-party services including Sinch SMS, Nodemailer, and OneDoc to facilitate automated notifications and digital document processing. Developed sophisticated features such as QR code-based attendance capture, real-time logging, and a comprehensive analytical dashboard for key metrics. Results: Significantly optimized Human Resources (HR) operations, resulting in a substantial reduction in manual labor. Enhanced data integrity and reporting accuracy through the deployment of automated processing systems. Delivered a high-availability platform with demonstrably optimized backend performance and stability.

PostgreSQLAWS (EC2 S3 Lambda)SupabaseCI/CD PipelinesVercelGitHub ActionsGitHub CopilotNext.jsNode.jsTailwind CSSZustandTypeScript

Junior Full Stack Developer

Poshsidekick

Sep 2023 - Feb 2024

Key Achievements:

Challenge: The existing SaaS platform required substantial enhancements to its mobile application stability, administrative tool functionality, and overall system performance. Implementation: Re-engineered and maintained the SaaS mobile application utilizing React Native, effectively resolving critical performance bottlenecks and rectifying UI/UX defects. Optimized the administrative control panel through the implementation of Next.js, resulting in improved data management, enhanced user administration capabilities, and increased system responsiveness. Conducted extensive refactoring of core code modules to significantly improve code maintainability and application scalability. Managed and maintained AWS/Firebase server infrastructure, executing query optimizations and ensuring continuous infrastructure stability. Quantifiable Results: Achieved and sustained a service availability of 99.9% uptime, leading to a reduction in user-reported issues and a significant improvement in application speed and reliability. Facilitated accelerated feature deployment through the establishment of a cleaner architectural design and streamlined development workflows. Reduced the volume of customer service technical inquiries through proactive issue resolution and enhanced support mechanisms.

GitHub CopilotAPI IntegrationReact NativeNext.jsZustandTailwind CSSNode.jsTypeScriptRedux/Context APIPrismaMySQLFirebase

Quick Stats

Age23 years
English LevelConversational
Other Languages
Tagalog/FilipinoFluent
ID VerificationVerified
Portfolio
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Education

Bachelor's Degree

Cavite State University

2021 - 2025