A collection of practical backend engineering work and learning projects focused on distributed systems, payments architecture, reliability improvements, and scalable microservices design.
Most of these are inspired by real-world problems I’ve worked on in fintech and high-volume transaction systems.

Distributed Systems Design

Distributed Systems Patterns Repository

A hands-on repository where I explore common distributed system challenges and how they are typically solved in production environments.

These examples are intentionally simple but structured in a way that reflects real implementation approaches.

Topics covered

  • Rate limiting approaches (Token Bucket, Sliding Window)
  • Circuit breaker pattern
  • Retry and exponential backoff handling
  • Idempotent API design for safe retries
  • Distributed locking patterns
  • Saga orchestration basics
  • API gateway responsibilities
  • Event-driven architecture fundamentals

GitHub Repository: distributed-systems-design

FinTech & Payments Architecture

Payment Platform Architecture

Architecture notes and design examples inspired by real payment systems I have worked with or studied.

Focus is on understanding how different components interact to support reliable and auditable financial transactions.

Areas covered

  • Payment workflow orchestration
  • Ledger service design concepts
  • Reconciliation flow understanding
  • Idempotency handling for financial operations
  • Fraud detection integration points
  • Handling high-volume transaction processing

Main focus is on reliability, traceability, and consistency which are important in financial systems.

Java Design Patterns

Enterprise Design Patterns in Java

A collection of commonly used design patterns with simple implementations in Java.

The intention is to keep examples practical and focused on patterns frequently seen in enterprise backend systems.

Patterns implemented

  • Factory pattern
  • Strategy pattern
  • Builder pattern
  • Adapter pattern
  • Decorator pattern
  • Template pattern
  • Observer pattern

GitHub Repository: java-design-patterns

Backend Coding Challenges

Interview-style backend engineering problems

A small collection of coding exercises based on typical backend scenarios such as parsing, aggregation, and data transformation.

Focus is on writing code that is readable, testable, and easy to extend.

Examples

  • Log parser implementation
  • Transaction aggregation logic
  • String normalization logic
  • Duplicate transaction detection
  • Structured input parsing
  • Basic rate limiting implementation

GitHub Repository: java-data-structures-algorithms

Platform Engineering Initiatives

CI/CD & Deployment Modernization Concepts

Notes and examples based on CI/CD improvements I have worked on, especially around improving release confidence and reducing manual deployment effort.

Examples include:

  • CI/CD pipeline structure ideas
  • Blue-green deployment concept
  • Canary deployment approach
  • Release safety improvements
  • Deployment automation practices

Tools referenced:

  • Jenkins
  • Spinnaker
  • Git workflows
  • Container-based deployment

Cloud-Native Microservices

Examples of microservice architecture approaches commonly used in cloud environments.

Focus is on structuring services in a way that supports scalability, resilience, and easier maintenance.

Key areas

  • Spring Boot microservices structure
  • Kubernetes deployment considerations
  • AWS infrastructure patterns
  • Observability integration
  • Resilience patterns for distributed services

Technologies referenced:

  • Java
  • Spring Boot
  • Kafka
  • Docker
  • Kubernetes
  • AWS

Ongoing Work

I continue to gradually add more practical notes and examples based on topics I work on or explore:

  • system design examples
  • architecture decision notes
  • performance improvement learnings
  • observability approaches
  • microservice migration learnings

For deeper architecture walkthroughs, see the Architecture section.