# Yusuf YILDIZ

> Senior fullstack Java developer and technical lead based in Istanbul, Türkiye (UTC+3), working remotely with product teams. Builds backend systems, web and mobile products, and cloud-native delivery with Java 25, Spring Boot 4, React and Kubernetes.

I'm Yusuf YILDIZ, a senior full-stack Java developer and technical lead. I help teams design, build and scale backend systems, web and mobile products, and the cloud infrastructure that runs them.

## Key facts

- Name: Yusuf YILDIZ
- Role: Senior Fullstack Java Developer and Technical Lead
- Location: Istanbul, Türkiye (UTC+3), working remotely
- Languages: English, Turkish
- Experience: building production software since 2009, 15+ years of production Java
- Industries: Health IoT, Mobile payments, Telecom, Digital identity, Commodity trading
- Core stack: Java 25, Spring Boot 4, React, React Native, TypeScript, PostgreSQL, Kafka, Docker, Kubernetes, AWS, Azure
- Availability: Available for remote projects

## Services

- **Backend engineering**: Fast, secure and well-tested services and APIs that hold up under real traffic, designed to stay easy to change as your product grows. Technologies: Java 25, Spring Boot 4, REST, GraphQL, Kafka, PostgreSQL.
- **Full-stack products**: Web and mobile products built end to end, from the database to the screen your users touch. Technologies: React, React Native, TypeScript, Spring Boot.
- **Architecture and modernization**: System design for new platforms, and step-by-step migration of legacy monoliths to services without stopping the business. Technologies: Microservices, Domain-driven design, Event-driven, CQRS.
- **Cloud-native delivery**: Containerized deployments, CI/CD pipelines and observability, so shipping becomes routine. Technologies: Docker, Kubernetes, Argo CD, Terraform, AWS, Azure.
- **Technical leadership**: A hands-on lead for your team: architecture decisions, code review, mentoring and a delivery rhythm that works. Technologies: Scrum, TDD, Code review, Mentoring.
- **AI integration**: AI features built into existing products, from anomaly detection to LLM-powered workflows, with the engineering to run them in production. Technologies: LLM integration, Anomaly detection, Data pipelines, AI-assisted development.

## Why teams work with him

- **Senior and hands-on**: More than 15 years of production Java. I design the architecture and I write the code.
- **From zero to live, and from legacy to modern**: I have built platforms from scratch and migrated a live mobile payment system from a legacy monolith to microservices.
- **Remote by default**: Working from Istanbul (UTC+3) with teams across time zones, in English or Turkish.

## FAQ

### What kind of projects do you take on?

Backend and fullstack work on Java platforms: new products built from scratch, modernization of legacy systems, cloud-native delivery, and technical leadership for engineering teams.

### Do you work remotely?

Yes. I work remotely from Istanbul, Türkiye (UTC+3) with teams in other time zones, in English or Turkish.

### Which technologies do you use?

Java 25 and Spring Boot 4 on the backend; React, React Native and TypeScript on the front end; PostgreSQL and Kafka for data; and Docker, Kubernetes, Argo CD and Terraform on AWS or Azure for delivery.

### Can you lead an engineering team?

Yes. I have led backend, frontend, mobile and AI engineers on the same product, owning architecture decisions, code review, mentoring and delivery in Scrum.

### How do we start working together?

Email me at yusufyildiz86@gmail.com with a short description of your product, your team and your timeline. From there we can set up a call to discuss scope.

## Contact

- Email: yusufyildiz86@gmail.com
- LinkedIn: https://www.linkedin.com/in/yusufyildiz34
- GitHub: https://github.com/yusufyildiz34
- Website: https://yusufyildiz.co/