Experienced Full StackEngineer

Real-time chat backend with document processing and Amazon Bedrock–powered summarization for messages, files, forms, and channel activity.

• ▸Integrated Amazon Bedrock agents with slash-command style invocation (e.g. `/bob`) and server-side prompt orchestration
• ▸Implemented summarization jobs over threaded messages, uploaded documents, form submissions, and poll payloads; rolled up channel-level aggregates
• ▸Exposed REST endpoints and middleware for auth, file ingestion, and low-latency handoff to Bedrock

Educational course learning platform (reading): PDF materials become structured digital courses with semantic retrieval and assessments.

• ▸Built PDF ingestion → chunking → embedding pipeline with vector similarity search for lesson retrieval
• ▸Implemented Next.js/React rendering for hierarchical course JSON; wired quiz submission and grading APIs
• ▸Configured BullMQ workers and Redis-backed caches; persisted user progress and activity events

Decentralized energy marketplace on Optimism: Solidity contracts, contract-based auth, React UI, and location-aware trading via PostGIS.

• ▸Wrote and deployed Optimism Solidity contracts for P2P energy listings and settlement; enforced authorization via on-chain checks
• ▸Integrated Infura JSON-RPC; implemented Node REST layer and React hooks for contract reads/writes and error handling
• ▸Modeled geospatial supply/demand with PostGIS geometry types and spatial indexes for radius queries

Video-based learning platform: FFmpeg audio extraction, AI speech-to-text, structured reading from subtitles, and automated assignments.

• ▸Automated FFmpeg audio extraction and STT pipeline; normalized subtitle output into structured reading documents
• ▸Implemented assignment generation from transcript metadata with PostgreSQL persistence and versioning
• ▸Built authenticated REST APIs for upload, job status, and streaming delivery; tuned React media player and loading states

Learning-strategy platform using NeuroSky and BrainBit headbands: real-time EEG streams, FFT features, and live brainwave charts.

• ▸Wrapped vendor SDKs in a Node service with WebSocket fan-out; synchronized browser clients to hardware sample rate
• ▸Implemented FFT on streaming samples; exposed alpha/beta/theta band metrics to the React chart layer
• ▸Reduced UI jank with throttled chart updates and backpressure on the socket consumer

Full-stack vehicle rental: availability, bookings, admin dashboard, auth, payments, and REST APIs.

• ▸Implemented booking conflict detection and availability queries in PostgreSQL with transactional writes
• ▸Built React admin CRUD for fleet and reporting; auth middleware with role-gated admin routes
• ▸Integrated payment provider webhooks; server-side idempotency keys and input validation on rental endpoints

Full-stack nutrition platform: structured diet programs with weekly meal planning and personalized patient recipe access tied to program schedules.

• ▸Implemented Firebase Storage multi-file uploads and Firestore models for weekly program ↔ recipe relations
• ▸Refactored client data layer for listener-driven updates; tightened REST PUT/DELETE handlers and optimistic UI rollback
• ▸Debugged cross-stack race conditions; reduced unnecessary re-renders and aligned client cache with server responses

Laravel admin dashboard for recipes, ingredients, seasonings, distributors, nutrition/calorie calculations, and canvas-based data views.

• ▸Authored migrations, Eloquent relationships, form requests, and timezone-aware `created_at`/`updated_at` across entities
• ▸Implemented server-side nutrition and calorie aggregation from ingredient rows; rendered summaries with HTML5 Canvas
• ▸Shipped versioned REST JSON for downstream consumers; Blade-based admin forms with validation error surfacing

Node.js backend for family group vacations: intelligent APIs, AI chat agents, planning automation, and mobile app integration.

• ▸Designed REST resources for vacations, shopping lists, and weekend plans with shared-group consistency constraints
• ▸Implemented RAG-style chat agent: retrieval over plan entities, tool calls, and structured JSON responses for the mobile client
• ▸Integrated `rrule` for iCal-compatible recurrence expansion; exposed expanded instances via query parameters

React food ordering and delivery app: menus, cart, checkout, maps for distance and delivery cost, recommendations, and order tracking.

• ▸Wired browser geolocation and Maps distance APIs into a pricing function with configurable rate rules
• ▸Implemented cart/checkout state machine in React; debounced address autocomplete against the REST backend
• ▸Added lightweight recommendation scoring from order history; periodic order status refresh against REST endpoints

Loan platform with live bank rates, EMI calculator, secure applications, and admin tools.

• ▸Implemented EMI math module (principal, tenor, compounding) with parameterized MySQL rate tables
• ▸Implemented separate auth flows for applicants vs admins; parameterized queries for PII fields
• ▸Exposed REST endpoints for rate CRUD and application intake; React multi-step forms with client + server validation

WordPress company portfolio with custom theme, event registrations, newsletter integration, and payments.

• ▸Built a custom PHP theme with template parts; registered custom post types/meta for events and reusable blocks
• ▸Hooked payment gateway checkout and newsletter provider APIs via `wp_remote_post` with nonce and capability checks
• ▸Tuned `enqueue` order/minification, lazy image attributes, and core SEO meta (title, OG, canonical) in `functions.php`

Real estate site built with a Node.js + Handlebars static generator: property listings, templates, and performance-focused prerendered pages.

• ▸Scripted static HTML generation from JSON listings using Handlebars partials and shared layouts
• ▸Implemented listing/detail URL mapping, image carousels via vanilla JS, and Nodemon-based local rebuild loop
• ▸Optimized asset paths, responsive CSS grid, and deep links (WhatsApp, social) without a runtime CMS

WordPress portfolio for study-abroad services: custom theme, structured content, plugins, SEO, and admin-friendly updates.

• ▸Child theme overrides for templates; `register_nav_menus` and widget areas for flexible CMS editing
• ▸Adjusted plugin hooks and `pre_get_posts` where needed; reduced duplicate queries on archive templates
• ▸Cross-browser CSS resets, flex/grid layouts, and print-friendly tweaks without breaking Gutenberg blocks

Bilingual workforce platform site (EN/PT) for agricultural, construction, and service recruitment with contact and recruitment flows.

• ▸Configured Tailwind + PostCSS build; split markup into reusable sections with EN/PT copy toggles
• ▸Posted contact forms to Web3Forms with `fetch`, client-side validation, and accessible error states
• ▸Minified CSS/JS in production pipeline; responsive breakpoints and reduced layout shift on hero imagery

Construction company portfolio: services, project gallery, maps, SEO, and interactive static UI (Tailwind + JavaScript).

• ▸Vanilla JS modules for modals, carousels, counters, mobile drawer nav, and anchor smooth-scroll
• ▸Embedded Maps JavaScript API with lazy init; added JSON-LD, Open Graph, and canonical link tags
• ▸Utility-first Tailwind layout with `srcset`-friendly gallery markup and minimal blocking scripts