Alvin Theofilus

Senior Fullstack Engineer

Building scalable, real-time systems across fintech, AI, and enterprise messaging.MERN • NestJS • Next.js • Flutter • AI/RAG • DevOps

Email MeGitHubLinkedIn

Tech Stack

ReactNext.jsTypeScriptNode.jsNestJSExpress.jsMongoDBPostgreSQLRedisDockerGCPFlutterOpenAI APIsRAGWebSocket

Experience

Senior Software Engineer @ Qonflo

Oct 2025 - Present • Contract

Fullstack Engineer @ VeloxAI

May 2025 - Oct 2025 • Contract

Software Engineer @ camLine

Jul 2022 - Feb 2025 • Full-time

Projects

Workflow Automation Engine

Qonflo

Built an n8n-style internal workflow automation engine with reusable components, full audit logging, and async execution via BullMQ workers triggered by WhatsApp webhooks.

NestJSBullMQRedisWhatsApp APIDocker Swarm
  • ▸ Multi-tenant WhatsApp Coex API
  • ▸ Zero-downtime GCP deployment
  • ▸ RBAC end-to-end

AI Financial Document Analysis

VeloxAI

Built a RAG pipeline for AI-powered financial document analysis, plus automated trading-signal systems analyzing market sentiment via OpenAI APIs and web scrapers.

NestJSOpenAI Agents SDKRAGVector DBOCR
  • ▸ RAG + Vector stores
  • ▸ Next.js 15 dashboard
  • ▸ Flutter cross-platform app

Interactive Data Dashboards

camLine

Engineered data visualization dashboards rendering 10K+ records with sub-second responsiveness. Designed REST APIs in Spring Boot and automated E2E test suites.

ReactPlotly.jsSpring BootCypress
  • ▸ Sub-second 10K+ records
  • ▸ Cypress E2E automation
  • ▸ Performance optimization

Omagadtopup

Personal Project

Fully automated online store selling in-game currencies. End-to-end from order to delivery.

CodeIgniter 3PHPMySQL
  • ▸ Full automation
  • ▸ Production since 2023