Hi 👋 My name is Nathan Pombi
Junior Software Developer
I'm a Software Development graduate and Java Backend Developer focused on building production-ready systems with clean architecture, strong data integrity, and real-world scalability in mind.

I specialize in designing secure REST APIs, financial systems, and backend services using Java + Spring Boot, with a strong emphasis on testing, concurrency, and maintainability.

🌍 I'm based in South Africa
✉️ You can contact me at pombinathan@gmail.com
🤝 I'm open to collaborating on REST APIs, java backend services
🚀 Featured Projects

🔹 Finance Tracker API

👉 https://github.com/NatePombi/finance-tracker-api

A production-ready financial management REST API built with Spring Boot, designed around real-world accounting and data integrity principles.

Highlights

🌐 Deployed on Render with PostgreSQL
🔐 JWT authentication with strict user-scoped data access
💰 Ledger-based balance calculation with no stored balance
📊 Monthly financial analytics, category breakdowns, and reporting
🔎 Advanced filtering, pagination, and date-based queries
⚡ Optimized JPA queries using JOIN FETCH to reduce N+1 query issues
🗄️ Flyway-managed database migrations
🐳 Fully Dockerized for consistent deployment
🤖 AI-powered financial analysis and spending insights

Tech: Java · Spring Boot · Spring Security · PostgreSQL · JWT · Docker · Flyway · Swagger/OpenAPI · Render

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🔹 Banking System API

👉 https://github.com/NatePombi/banking-system-api

A secure, concurrency-safe banking backend built with Spring Boot, implementing transaction-processing and fintech architecture patterns.

Highlights

🌐 Deployed on Render with PostgreSQL
💸 Atomic money transfers with transactional guarantees
📒 Double-entry ledger system for financial integrity
🔒 Pessimistic and optimistic locking for concurrency control
🔄 Idempotent transaction processing to prevent duplicate transactions
🔐 Deadlock prevention through deterministic account locking
🧾 Audit logging for transaction traceability
🧪 JUnit testing covering concurrency and edge cases
🗄️ Flyway-managed database migrations

Tech: Java · Spring Boot · Spring Security · PostgreSQL · JWT · Docker · Flyway · JUnit · Mockito · Swagger/OpenAPI · Render

Java Programming Masterclass — Udemy

• Completed: Nov 2025
• 📄 View Certificate: View Certificate

• Enhancing backend systems with scalability & performance improvements
• Preparing projects for full-stack integration (frontend + backend)
• Actively seeking Java Backend Internship / Junior Developer roles

• GitHub: https://github.com/NatePombi
• Email: pombinathan@gmail.com
• LinkedIn: https://www.linkedin.com/in/nathanpombi/

⭐ Open to opportunities where I can contribute to real-world backend systems and continue growing as a software engineer.