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I am a Senior Backend Java Developer with over 6 years of experience specializing in building scalable, cloud-native backend systems and APIs using Java, Spring Boot, and microservices architectures. My expertise also includes AWS cloud technologies, DevOps automation tools like Terraform and Docker, and multiple database management systems such as MySQL, PostgreSQL, and MongoDB. Throughout my career, I've contributed to projects in data services, rail systems, financial platforms, and engineering applications, always prioritizing high availability, performance optimization, and security. I am skilled in agile teamwork, test automation, and incident management, ensuring reliable software delivery. My extensive background in robust backend engineering and cloud integration positions me well to contribute effectively to data and analytics platforms requiring strong backend solutions.…I am a Senior Backend Java Developer with over 6 years of experience specializing in building scalable, cloud-native backend systems and APIs using Java, Spring Boot, and microservices architectures. My expertise also includes AWS cloud technologies, DevOps automation tools like Terraform and Docker, and multiple database management systems such as MySQL, PostgreSQL, and MongoDB. Throughout my career, I've contributed to projects in data services, rail systems, financial platforms, and engineering applications, always prioritizing high availability, performance optimization, and security. I am skilled in agile teamwork, test automation, and incident management, ensuring reliable software delivery. My extensive background in robust backend engineering and cloud integration positions me well to contribute effectively to data and analytics platforms requiring strong backend solutions.

Janos Szalkai

Back-End Developer, Developer, Programmer, +2

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I am a Senior Backend Java Developer with over 6 years of experience specializing in building scalable, cloud-native backend systems and APIs using Java, Spring Boot, and microservices architectures. My expertise also includes AWS cloud technologies, DevOps automation tools like Terraform and Docker, and multiple database management systems such as MySQL, PostgreSQL, and MongoDB. Throughout my career, I've contributed to projects in data services, rail systems, financial platforms, and engineering applications, always prioritizing high availability, performance optimization, and security. I am skilled in agile teamwork, test automation, and incident management, ensuring reliable software delivery. My extensive background in robust backend engineering and cloud integration positions me well to contribute effectively to data and analytics platforms requiring strong backend solutions.…I am a Senior Backend Java Developer with over 6 years of experience specializing in building scalable, cloud-native backend systems and APIs using Java, Spring Boot, and microservices architectures. My expertise also includes AWS cloud technologies, DevOps automation tools like Terraform and Docker, and multiple database management systems such as MySQL, PostgreSQL, and MongoDB. Throughout my career, I've contributed to projects in data services, rail systems, financial platforms, and engineering applications, always prioritizing high availability, performance optimization, and security. I am skilled in agile teamwork, test automation, and incident management, ensuring reliable software delivery. My extensive background in robust backend engineering and cloud integration positions me well to contribute effectively to data and analytics platforms requiring strong backend solutions.

Available to hire

I am a Senior Backend Java Developer with over 6 years of experience specializing in building scalable, cloud-native backend systems and APIs using Java, Spring Boot, and microservices architectures. My expertise also includes AWS cloud technologies, DevOps automation tools like Terraform and Docker, and multiple database management systems such as MySQL, PostgreSQL, and MongoDB. Throughout my career, I’ve contributed to projects in data services, rail systems, financial platforms, and engineering applications, always prioritizing high availability, performance optimization, and security.

I am skilled in agile teamwork, test automation, and incident management, ensuring reliable software delivery. My extensive background in robust backend engineering and cloud integration positions me well to contribute effectively to data and analytics platforms requiring strong backend solutions.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

Hungarian

Fluent

English

Advanced

Finnish

Beginner

Work Experience

Senior Backend Java Developer at TFP Solutions Kft.

August 31, 2025 - August 22, 2025

Designed, developed, and maintained scalable backend services and APIs using Java (Spring Boot) and various AWS technologies to support high-traffic, high-availability systems. Led key modules such as Distribution Financing, Factoring, and Payables Financing ensuring system reliability and scalability. Architected microservices solutions leveraging AWS infrastructure, automated cloud infrastructure provisioning with Terraform, optimized backend performance, and applied AWS security best practices. Led code reviews, resolved production incidents, and collaborated with cross-functional teams to deliver robust backend solutions aligned with business objectives.

Software Engineer at Knorr-Bremse Rail Systems

July 31, 2023 - August 22, 2025

Contributed to development of Java-based multi-layered applications that reduced operational costs by 15% via process automation and system optimization. Designed and implemented new business features and APIs, improved code quality with automated tests, set up and maintained CI/CD pipelines, optimized system performance and security, resolved complex bugs, and worked closely with frontend, QA, and product teams using agile methodologies.

Java Developer at Böröczffy Engineering Office Ltd.

December 31, 2020 - August 22, 2025

Integrated a video streaming service for remote quality control, enhancing project oversight. Developed backend features applying object-oriented programming with Java and Spring Boot, performed database operations, wrote and executed unit tests, fixed bugs, participated in code reviews, and supported team collaboration in agile ceremonies.