Mehmet Ali SAHINOGULLARI

• Developed and maintained high-traffic web applications using Java, JavaScript, HTML/CSS3, ensuring optimal performance across 2,000+ websites
• Designed and implemented modular components, improving code reusability and reducing development time.
• Built user-friendly CMS features for educational platforms, streamlining content management for schools.
• Collaborated with cross-functional teams (QA, DevOps) to ensure smooth deployments and system stability.
  Key Technologies Used:
  Backend: Java, Apache, Tomcat
  Frontend: JavaScript, HTML5, CSS3
  Other: Modular Architecture, Performance Optimization, CMS Development

Sole Backend Developer in a small agile team, owning the entire backend ecosystem and infrastructure.

Key Responsibilities & Achievements:

• Database & Architecture Leadership: Designed and managed MySQL/MongoDB databases, optimized queries, and migrated from monolith to microservices using the Strangler Pattern, improving scalability.
• Performance & Infrastructure: Overhauled backend architecture (Java/Spring Boot, Kotlin, Node.js) to boost API response times by 40%+ and implemented Redis Streams for real-time data processing.
• DevOps & Cloud: Built CI/CD pipelines (Jenkins, Bitbucket), containerized services with Docker/Kubernetes, and deployed scalable infrastructure on AWS (EKS, EC2, Route53, Load Balancers).
• Critical Features: Developed a Socket.io-based real-time notification system and integrated payment gateways (e.g., Stripe, PayPal) with secure JWT/Spring Security auth.
• Search & Data: Engineered complex search functionalities using ElasticSearch and streamlined data flow with event-driven Redis streams.

Technologies Used:

• Backend: Java 8/11, Kotlin, Node.js, Spring Boot, Spring Security, JWT, Hibernate, JPA
• Databases: MySQL (RDS), MongoDB, ElasticSearch, Redis
• DevOps: AWS (EKS, EC2, ECR, Route53), Docker, Kubernetes, Jenkins, Bitbucket

• I was responsible of development, improvement and maintenance of software products which is based on telecom systems.
• Technologies:
• Backend: Java8, Spring Boot, Spring DataJPA, EhCache
• Frontend: Angular7
• Database: PostgreSQL

• Company Overview: Sistek Co. serves ERP software programs and consultancy.
• I was responsible for maintain and develop these applications which are mostly running on production environment.
• During my Sistek career, I have contributed many projects include mobile and web.
• Sistek Co. serves ERP software programs and consultancy.
• Technologies which I ever used in Sistek
• WEB:
• Backend: Java-6, Java-8, JSF, Servlet, Frameworks: Spring, Spring Data JPA, Frontend: Primefaces, Angular(4-5)
• ORM: Hibernate, Report: Jasper Reports, Testing: JUnit, Mockito
• MOBILE:
• API's: Spring and Java
• Database: SQLite
• Languages: Javascript(ES5, ES6)
• Frameworks: Ionic(3-4, Native) based on Angular-5, JQuery Mobile

• Company Overview: This company serves software programs on security and face recognition systems.
• In this period of time, I was working as backend and frontend developer, because of being a new one on engineering, mainly frontend works are on me.
• This company serves software programs on security and face recognition systems.
• Softwares, are used:
• Frontend: HTML5, Backbone j.s.
• Backend: Java, Spring Boot, Gradle
• Database: PostgreSQL, MSSQL
• Operating Systems: Mac OS