Full-Stack Developer

Baran Kaplan

I build backend systems with Java and Spring Boot, work on DevOps and CI/CD workflows using Kubernetes-related tools, and build modern web applications with React and Next.js. My focus is on building software that remains reliable, maintainable, and clear from development through deployment.

My Story

A personal story about my journey from Istanbul/Turkey to Germany.

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CV

A page for my experience, education, and CV details.

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Work Areas

Backend

I build backend systems with Java and Spring Boot, follow modern Java features, and work on service communication with REST, SOAP, and gRPC.

Domain-Driven Design
API design
API contracts, validation, and documentation
Error handling and resilience
Authentication and authorization
Database design and schema evolution
JPA and query design
Transaction management
Data consistency and idempotency
Application and environment configuration
Caching with Caffeine, Redis, and Hazelcast
Event streaming with Kafka
Synchronous, asynchronous, and message-driven flows
Batch processing
Observability
Performance and concurrency
Versioning and backward compatibility
Containerized deployment
Unit, integration, and external tests

DevOps and CI/CD

I work on DevOps processes with Kubernetes-related tools and CI/CD pipelines.

This includes intermediate end-to-end deployment workflows, release pipelines, environment setup, and practical infrastructure work from build to rollout.

Docker
Kubernetes
Helm
Ingress
API gateway basics
Reverse proxy setup
Load balancing
Istio
Kubernetes operations
Deployment design
Argo CD
GitLab CI/CD
HashiCorp Vault
Container registries
Secrets management
Environment configuration
Traffic management
Progressive rollouts
Observability basics
Release automation

Frontend

I build frontend applications with React and Next.js, including single-page application flows, component architecture, routing, data fetching, backend-connected interfaces, rendering strategies, accessibility, and performance.

Component architecture
Single-page application flows
Routing and navigation
React state management
Data fetching
API integration
Forms and validation
Authentication flows
Server and client rendering
SSR, SSG, and SEO
Responsive design
Accessibility
Error and loading states
Performance optimization
Reusable UI patterns

Portfolio

Quiet Spot Finder

A React and Next.js portfolio project with protected live place data, provider-backed pagination, hybrid filtering, visible-result bulk actions, shortlist notes, and compare mode.

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Portfolio 2

A second placeholder page for another upcoming project.

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Portfolio 3

A third placeholder page for a future portfolio entry.

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Blog

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Backend

Getting Started with DDD

A simple introduction to DDD and where it fits in backend systems.

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Backend

Building Backend Systems with Java and Spring Boot

A practical look at structure, validation, and API basics.

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DevOps

Starting Kubernetes with the Right Mindset and a First Realistic Lab

A mindset-first introduction to Kubernetes, covering cluster roles, scheduling rules, and a realistic first local lab with Minikube, PostgreSQL, Adminer, and Headlamp.

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DevOps

Kubernetes Terms and Concepts

A practical Kubernetes reference page with beginner, intermediate, and advanced concepts, plus a quick index for jumping between terms.

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Frontend

What to Know Before Learning React

The basics worth understanding before starting React.

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Contact

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