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Hi, I'm Retu Leminen, a Senior Full Stack Developer based in Helsinki, Finland. I bring about 10 years of experience building robust, scalable applications across healthcare, finance, and technology sectors. I specialize in both backend and frontend development, database design, AI integrations, and cloud-based systems, and I enjoy turning complex requirements into reliable software that users love. In my recent roles at Netlight Consulting and Loihde, I led AI-powered initiatives, migrated legacy systems to modern cloud architectures with AWS and Terraform, built microservices and GraphQL APIs, and elevated CI/CD with Jenkins and GitHub Actions. I also champion containerization with Docker and Kubernetes and mentor teammates to promote growth and best practices.…Hi, I'm Retu Leminen, a Senior Full Stack Developer based in Helsinki, Finland. I bring about 10 years of experience building robust, scalable applications across healthcare, finance, and technology sectors. I specialize in both backend and frontend development, database design, AI integrations, and cloud-based systems, and I enjoy turning complex requirements into reliable software that users love. In my recent roles at Netlight Consulting and Loihde, I led AI-powered initiatives, migrated legacy systems to modern cloud architectures with AWS and Terraform, built microservices and GraphQL APIs, and elevated CI/CD with Jenkins and GitHub Actions. I also champion containerization with Docker and Kubernetes and mentor teammates to promote growth and best practices.

Retu Leminen

Full Stack Developer, Back-End Developer, Front-End Developer, +2

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Hi, I'm Retu Leminen, a Senior Full Stack Developer based in Helsinki, Finland. I bring about 10 years of experience building robust, scalable applications across healthcare, finance, and technology sectors. I specialize in both backend and frontend development, database design, AI integrations, and cloud-based systems, and I enjoy turning complex requirements into reliable software that users love. In my recent roles at Netlight Consulting and Loihde, I led AI-powered initiatives, migrated legacy systems to modern cloud architectures with AWS and Terraform, built microservices and GraphQL APIs, and elevated CI/CD with Jenkins and GitHub Actions. I also champion containerization with Docker and Kubernetes and mentor teammates to promote growth and best practices.…Hi, I'm Retu Leminen, a Senior Full Stack Developer based in Helsinki, Finland. I bring about 10 years of experience building robust, scalable applications across healthcare, finance, and technology sectors. I specialize in both backend and frontend development, database design, AI integrations, and cloud-based systems, and I enjoy turning complex requirements into reliable software that users love. In my recent roles at Netlight Consulting and Loihde, I led AI-powered initiatives, migrated legacy systems to modern cloud architectures with AWS and Terraform, built microservices and GraphQL APIs, and elevated CI/CD with Jenkins and GitHub Actions. I also champion containerization with Docker and Kubernetes and mentor teammates to promote growth and best practices.

Available to hire

Hi, I’m Retu Leminen, a Senior Full Stack Developer based in Helsinki, Finland. I bring about 10 years of experience building robust, scalable applications across healthcare, finance, and technology sectors. I specialize in both backend and frontend development, database design, AI integrations, and cloud-based systems, and I enjoy turning complex requirements into reliable software that users love.

In my recent roles at Netlight Consulting and Loihde, I led AI-powered initiatives, migrated legacy systems to modern cloud architectures with AWS and Terraform, built microservices and GraphQL APIs, and elevated CI/CD with Jenkins and GitHub Actions. I also champion containerization with Docker and Kubernetes and mentor teammates to promote growth and best practices.

Skills

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Expert

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Intermediate

Work Experience

Senior Full Stack Developer at Netlight Consulting

August 31, 2025 - October 6, 2025

Led the end-to-end development of AI-powered applications using React.js and Node.js to improve client data processing capabilities. Managed backend systems, built microservices, and implemented GraphQL APIs, optimizing data flow and application performance. Introduced serverless architecture with AWS Lambda, reducing infrastructure costs by 40% while scaling the application to support 1 million+ daily active users. Integrated machine learning models into production systems, improving decision-making efficiency by 35%. Enhanced continuous integration and delivery pipelines using Jenkins and GitHub Actions, resulting in smoother deployments. Implemented containerization using Docker and Kubernetes for streamlined deployments and faster scaling. Mentored junior developers and led knowledge-sharing sessions. Spearheaded migration of legacy systems to cloud architectures using AWS and Terraform, reducing operational overhead.

Full Stack Developer at Loihde

August 31, 2023 - October 6, 2025

Designed and developed full-stack applications utilizing Node.js, React, and TypeScript for healthcare and finance clients. Implemented back-end systems using Java (Spring Boot) and integrated them with frontend components via REST and GraphQL. Leveraged TensorFlow-based models in data pipelines, leading to about a 25% improvement in data-driven insights. Collaborated with product teams to define functional and non-functional requirements, integrated third-party services, and refined deployment processes with CI/CD pipelines. Advocated for testing with Jest and Cypress to improve code reliability. Participated in Agile ceremonies and contributed to architectural discussions for scalable, reliable applications.

Junior Full Stack Developer at Vincit Oyj

February 1, 2020 - October 6, 2025

Developed and maintained web applications using JavaScript, Node.js, and React. Built RESTful APIs to enable efficient frontend-backend communication. Collaborated with UX/UI designers to create responsive, user-friendly interfaces and contributed to database design (MySQL, MongoDB) for performance and scalability. Participated in code reviews and adhered to clean code principles. Assisted in migrating legacy systems to modern web applications and contributed to Agile sprint activities.

Junior Backend Developer at Nium

March 1, 2017 - October 6, 2025

Developed backend services using Java, Node.js, and PHP for financial transaction processing. Integrated payment gateway APIs to enable secure and efficient transactions. Built microservices to handle transaction data, improving system scalability and resilience. Ensured high availability and fault tolerance in production environments using Docker. Supported automated testing frameworks and assisted in designing database schemas for PostgreSQL and MySQL to ensure data integrity.