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void-dar/README.md

Hi, I'm Prosper (KingCodex) 👋

Backend engineer building secure, scalable systems with a focus on payment infrastructure, API security, and distributed systems.

Currently building production backend services while pursuing a B.Sc. in Cybersecurity at Nnamdi Azikiwe University (UNIZIK).

What I'm Focused On

  • Backend Engineering
  • Payment Infrastructure
  • Application Security
  • Distributed Systems
  • AI-Integrated Backend Services

Tech Stack

Backend: NestJS · FastAPI · Express.js · TypeScript · Python

Databases: PostgreSQL · Redis

ORMs: TypeORM · Prisma · SQLModel

DevOps: Docker · GitHub Actions · Linux

Security: JWT Authentication · RBAC · AES-256-GCM Encryption · HMAC Verification · Audit Logging · OWASP Top 10

AI: OpenAI API · Hugging Face · PyTorch · scikit-learn

Featured Projects

Project What It Does Stack
🔐 Secure NestJS Starter Production-ready backend starter - auth, RBAC, rate limiting, logging, security-first architecture NestJS · PostgreSQL · Redis · Docker
💳 Crypto Sentry Cryptocurrency monitoring platform — wallet tracking, webhook processing, alerting, subscription management FastAPI · PostgreSQL · Alembic · Redis
🛡️ HashGuard AI-enhanced file integrity monitoring that detects anomalous file behavior FastAPI · PostgreSQL · Isolation Forest
📄 Document Intelligence API RAG backend for semantic document search and question answering FastAPI · LangChain · Qdrant · OpenAI
🚦 AI Firewall ML Model ML experiments for anomaly-based network traffic classification Python · scikit-learn
🎯 Candara Quiz App Full-stack quiz platform with Google OAuth2, AI-generated questions, and a leaderboard Express.js · PostgreSQL · OpenAI API

Production Experience

Backend systems I've built and shipped in production:

  • Payment processing workflows & multi-provider webhook handling
  • Queue-based background processing (idempotency, retries)
  • KYC verification pipelines (BVN/NIN + selfie)
  • Device registration systems (HMAC signature verification)
  • Field-level encryption (AES-256-GCM)
  • Secure authentication & authorization
  • Notification infrastructure

Currently Learning

Solidity · Smart Contract Security · Bug Bounty Hunting · Distributed Systems

2026 Goals

  • Ship production-grade backend libraries
  • Publish technical articles on backend engineering and API security
  • Contribute to the open-source ecosystem
  • Deepen expertise in application security and distributed backend systems

Pinned Loading

  1. void-dar void-dar Public

  2. hashguard hashguard Public

    AI-enhanced file integrity monitoring using SHA-256 + Isolation Forest anomaly detection

    Python

  3. document-intelligence-api document-intelligence-api Public

    RAG backend — document ingestion, vector search, LLM-powered Q&A with source attribution

    Python

  4. Crypto_Sentry Crypto_Sentry Public

    Async crypto wallet monitoring with Alchemy webhooks, Paystack/Stripe billing, and Telegram notifications

    Python

  5. candara-quiz-app candara-quiz-app Public

    Quiz platform with Google OAuth2, token wallet system, leaderboard, and secure JWT auth via HttpOnly cookies. Built with Node.js/Express and pnpm.

    JavaScript

  6. network-traffic-classifier network-traffic-classifier Public

    ML model for anomaly-based network intrusion detection using traffic pattern classification

    Jupyter Notebook