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hassan200503/README.md

Professional Summary

Software Engineer focused on production-grade, multi-tenant SaaS platforms — strong backend specialization in Java & Spring Boot, full-stack capable with React, Next.js, and TypeScript. Comfortable with domain-driven design, REST APIs, authentication, payment/billing integrations, and building systems where correctness and data integrity aren't optional.

Core Skills

  • Backend: Java, Spring Boot, Spring Data JPA/Hibernate, REST APIs, JWT Auth
  • Frontend: React, Next.js, TypeScript, React Query
  • Architecture: Multi-Tenant SaaS, Domain-Driven Design, Clean Architecture, Event-Driven Systems
  • Data & Infra: PostgreSQL, Flyway, Docker, Redis, Kafka
  • Payments: Gateway integrations, billing workflows, idempotent transactions
  • Practices: Automated & integration testing, Git/GitHub, OpenAPI

I am actively looking for a job, I can own a full system end to end or build you a specific feature and deploy it for you and give you back the link. If you are looking for a serious developer, please consider reaching out to me.

Email: karungwahassan03@gmail.com What'sApp: +254 714931575 Call: 254 714931575

Popular repositories Loading

  1. hassan200503 hassan200503 Public

    Personal information

  2. rentmanager-backend rentmanager-backend Public

    RentManager API: rental management for Kenyan landlords and renters. Spring Boot 3, Java 21, PostgreSQL, M-Pesa Daraja, Clerk auth, multi-tenant.

    Java

  3. rentmanager-frontend rentmanager-frontend Public

    RentManager web app: landlord dashboard and renter portal. Next.js, React, TypeScript, Clerk, M-Pesa.

    TypeScript

  4. hassan200503.github.io hassan200503.github.io Public

    Portfolio site for Hassan Tsuma

    HTML

  5. rentmanager-mobile rentmanager-mobile Public

    RentManager mobile app for landlords and renters in Kenya (Expo, React Native, TypeScript)

    TypeScript

  6. whatsapp-persona-bot whatsapp-persona-bot Public

    Auto-replies to WhatsApp messages in your own voice while you're offline, learns your writing style over time, and pitches freelance work to leads.

    JavaScript