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TOFY Go!: English Learning at Scale

Introduction

TOFY Go! is a fun and engaging English learning app designed for learners aged 8 and above. Whether preparing for the TOEFL Young Students Series or simply improving English skills, TOFY Go! makes learning feel like play – with interactive city exploration, badge earning, gamified lessons, and real skill-building aligned to standardized test curricula.

As the lead Full Stack Developer at Bee2 AI, I designed and built the entire cloud infrastructure from scratch, managed end-to-end CI/CD pipelines, led a 3-member engineering team, and developed both frontend and backend features alongside AI-powered content delivery systems.

Cloud Architecture (Designed & Built From Scratch)

Independently architected a scalable AWS infrastructure capable of supporting 500-600K users within the client’s budget constraints:

Core Services:

  • AWS ECS: Containerized application deployment with auto-scaling
  • AWS Lambda: Serverless functions for AI model inference and content processing
  • Amazon S3: Static asset storage, user-generated content, and media delivery
  • Amazon SQS: Asynchronous message queuing for background job processing
  • VPC + ALB: Private networking with Application Load Balancer for traffic distribution
  • AWS Secrets Manager: Secure credential management across all services
  • Route 53: DNS management and domain routing
  • CloudFront: Global CDN for low-latency content delivery
  • CloudWatch: Monitoring, logging, and alerting across the entire stack

AI & Agentic Systems Integration

  • AI Orchestration: Connected Claude via APIs to internal databases, compliance guardrails, and custom workflows using agent orchestration platforms
  • RAG Pipelines: Designed custom Retrieve-Augmented Generation pipelines for TOEFL-specific educational content delivery
  • Sub-Agent Hierarchies: Implemented multi-agent systems where specialized sub-agents handle different aspects of content generation, assessment, and personalization

Key Features Built

  • CMS Panel: Full content management system ensuring technical content and operational requirements were met
  • Comprehensive Testing: Backend test suite using Vitest for software quality assurance
  • End-to-End CI/CD: Automated deployment workflows from code commit to production
  • Team Leadership: Led 3-member engineering team, conducted direct client meetings, performed R&D on TOEFL content integration

Technologies Used

Frontend & Backend: TypeScript (full-stack) Cloud Infrastructure: AWS (SQS, S3, ECS, VPC, Secrets Manager, ALB, Route 53, CloudFront, CloudWatch), Docker AI/ML: Claude API, RAG pipelines, multi-agent orchestration Testing: Vitest CI/CD: Custom pipeline management and deployment workflows