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I am a versatile Software Developer who loves building strong backend services, RESTful APIs, and cross-platform applications. My main goal is to turn your business needs into clean, fast, and high-performing technical solutions using the best tools for the job—whether that is C#/.NET, Java, or Flutter. My primary focus is robust backend development (both in .NET ecosystem and Java/Spring), but I also have full-stack web and mobile (Flutter) experience. This helps me understand the whole software lifecycle, work easily with frontend/mobile teams, and deliver complete applications when needed. 🔷 What I Can Do For You: Backend Architecture (.NET & Java): I don't just write code; I design systems. I can help you from database design (Relational & NoSQL) all the way to deployment. API Development: I build secure, fast, and well-documented RESTful APIs that connect your systems smoothly. Cross-Platform Mobile: I develop scalable mobile applications using Flutter (Dart). Database Design, Optimization & Bug Fixing: I create clean database schemas, optimize queries, and debug complex ORM (Entity Framework Core, Hibernate) issues to ensure your application runs without errors. 🔷 Tech Stack: Backend: C#, .NET 6/7/8, Entity Framework Core | Java, Spring Boot, Hibernate Architecture: RESTful APIs, Microservices, MVC Databases: SQL Server, PostgreSQL, MySQL, MongoDB Frontend & Mobile: HTML, CSS, JavaScript, Flutter (Dart) Tools & DevOps: Git, Docker, Postman, xUnit, JUnit Practices: Clean Code, SOLID Principles, OOP

⚡ Backend systems should not become fragile over time; they must stay maintainable, scalable, and reliable as products grow. I am a Backend Engineer specializing in Java, Kotlin, and Spring Boot, focused on building production-grade systems where clean architecture, long-term maintainability, and stability are critical. I combine strong backend engineering practices with practical system design to create APIs and services that remain easy to extend, debug, and operate in real-world environments. Clients work with me when system quality, clean code, and scalable backend architecture matter, not just feature delivery. 🏆 Proven Engineering Approach ✔ Clean, maintainable backend architecture ✔ Production-focused development mindset ✔ Long-term scalability and reliability focus ✔ Clear communication and structured collaboration 🚀 Core Capabilities ☕ Backend Engineering with Java & Kotlin • Spring Boot application development • REST API design & implementation • Business logic architecture • Secure and maintainable backend systems • Performance-focused backend development 🏗 Scalable System Architecture • Microservice-based architectures • Modular and maintainable code structure • Service communication patterns • Production-ready backend design • Reliability and scalability optimization 🗄 Database & Persistence Engineering • PostgreSQL, MySQL, MongoDB • Hibernate / JPA / Spring Data JPA • Query optimization & data modeling • Relational and NoSQL database design ⚙ Development & DevOps Workflow • Docker-based environments • Git-based development workflows • Unit & integration testing • CI/CD-friendly project structures 🔍 Engineering Focus 🏢 Enterprise & Business Platforms Scalable APIs • backend services • maintainable systems 🚀 Startup Products & SaaS Platforms Fast iteration • clean architecture • long-term scalability 💡 Engineering Mindset • Architecture-first thinking • Clean and understandable code • Simplicity over over-engineering • Production reliability focus • Ownership from development to deployment • Long-term maintainability mindset 🧰 Technical Stack Java • Kotlin Spring Boot • Spring MVC • Spring Data JPA REST APIs • Microservices PostgreSQL • MySQL • MongoDB Hibernate • JPA Docker • Git ✨ Why Clients Choose Me ⭐ Clean and maintainable backend architecture ⭐ Scalable production-ready systems ⭐ Strong Java & Kotlin expertise ⭐ Clear communication & accountability ⭐ Reliable engineering mindset 🚀 Ready to Build Stable, Scalable Backend Systems? If you need a backend engineer who cares about clean architecture, maintainable systems, and production reliability, I am ready to help. Let us build backend systems that stay reliable, scalable, and easy to maintain long after launch.

Hi, I am a motivated senior software developer who strives for excellence in work. I have been working remotely for the last 6 years since pandemic. I have worked with a few US company for more than 2 years. I have just started working on freelancing on Upwork. My goal is to prove my skills and knowledge to clients for now. Briefly, I have experience for more than 10 years in Java software development. I have a strong academic background in Computer Science. I am specialized in Spring framework and Spring Boot. 𝐎𝐔𝐓𝐒𝐓𝐀𝐍𝐃𝐈𝐍𝐆𝐒 - Ability to design and develop micro-services and Restful APIs effectively in Java 8+, Java 17 and Java 21 - Spring Web, MVC, Kafka, JPA, Hibernate, JDBC, Reactive Programming, Webflux - SQL and NoSQL, MongoDB, PostgreSQL, MySQL, Snowflake, DBT - OAuth 2.0 , JWT / API Key, Spring Security 𝐅𝐑𝐎𝐍𝐓-𝐄𝐍𝐃 - React, Redux - Javascript, HTML, CSS, Tailwind CSS

I am a professional software developer. I graduated from Computer Engineering Department. I have worked in many projects as a software developer for 4+ years. ✅ I can help you with: - Building frontend & backend solutions with modern tech stacks - Fixing bugs and optimize your app's performance - Designing and developing responsive, modern UIs We can realize your professional projects with React / Next.js and Node.js / Spring Boot. If you are ready to get in touch, let's get started! 💻 I have used before: ▪ Java ▪ Spring Boot ▪ JavaScript ▪ Node.js ▪ Express ▪ CSS ▪ SASS/SCSS ▪ React ▪ Next.js ▪ Electron ▪ TypeScript ▪ Apollo ▪ Redux Toolkit ▪ Tailwind CSS ▪ HTML ▪ Arduino ▪ Git ▪ Docker ▪ Nginx ▪ AWS ▪ Google Cloud ▪ Azure ▪ Figma 🔗 GitHub: /ilhanozkan

I'm here to build your projects with utmost professionalism using modern and solid approaches. +5 years of experience in coding Java and JavaScript with React, NodeJs, Spring Boot, SQL or NoSQL DB Management, REST API, Authentication Management, MicroService oriented architectures, Mobile Development with Java(Android) or React Native(IOS & Android) and everything you'll need from a full stack developer. ✪ Some of the things that I can do for you: ✅ I can deliver ready to use web applications with front and back end developed. React or simple JQuery/HTML/CSS for the front-end and NodeJs or Spring Boot for the back-end. ✅ I can transform your Figma designs into HTML or React ✅ I can develop new modules, components to your existing projects, make new integrations or fix your bugs ✅ I can take a role in your team with a professional responsibility, work on task or hourly basis ✅ I can create email integrations for you Contact Forms in your WebSites using EmailJs or Nodemailer ✅ I can setup your own ODK server for your surveys, create your questionnaires in XLSForm standards for ODK or KOBO, help you to maintain your data collection processes ✅ I can make email integrations to your personal or business websites using EmailJs and NodeMailer and allow your contact forms to drop you an email when people wants to interact with you ✅ I can make SMS and Whatsapp integrations to your web and mobile apps using Twilio ✪ My past experiences in development for corporate and freelance projects are: 🔹️ Developing Project and Assistance Management software solutions for humanitarian world all around the globe(more than 50 projects in 4 continents +20 Countries). 🔹️ Payment Services through custom Android terminals with NFC cards, Bank Integrations, Voucher based assistance, Mobile Money. 🔹️ Data Collection solutions with the tools based on XLSForm Standards 🔹️ Complete E-Commerce systems with NodeJs and SFCC ✪ My Tech Stack ⚡ MERN (MongoDB, ExpressJs, React, NodeJs) ⚡ Nest.js Next.js, Remix ⚡ TailwindCSS, Sass ⚡ Java (Spring, Android) ⚡ Postgresql, MySql ⚡ React Native

I specialize in designing and developing robust, scalable, and secure web applications from end to end. I have a solid foundation in both front-end and back-end technologies, and I bring a practical, solution-oriented mindset to every project I take on. My backend expertise lies in Java and Spring Boot, where I build RESTful APIs, implement business logic, and manage databases with PostgreSQL. I follow clean code principles and design patterns to ensure maintainability and scalability. On the front-end, I work with HTML, CSS, JavaScript, and React.js, creating responsive and intuitive user interfaces. I focus on user experience, performance optimization, and cross-browser compatibility. I also use tools like Axios for API communication and Redux for efficient state management when needed. Version control (Git), containerization basics (Docker), and deployment to cloud platforms are part of my development workflow. I write clear documentation, perform thorough testing, and communicate proactively to ensure that the final product exceeds expectations. What sets me apart is my dedication to writing clean, efficient, and well-tested code, my strong grasp of full project lifecycles, and my genuine passion for turning ideas into high-quality digital solutions. Whether you're a startup needing a quick MVP or a business looking to modernize your systems, I'm here to help.