Johannes Ylönen

As a Full-Stack/DevOps Developer at Snowfall Oy, I played a pivotal role in developing several Moomin mobile games and applications. My work spanned backend development, mobile development, and DevOps (Kubernetes).

Backend Development & DevOps:

• Core Responsibility: Designing and developing backend services for Moomin mobile games.
• Technologies: Python/Flask, Nakama game server, PostgreSQL, NoSQL databases.
• Infrastructure: Self-managed Kubernetes cluster on Microsoft Azure, initially deployed on Azure App Service. Migrated from DC/OS to Kubernetes for improved scalability and flexibility.
• Responsibilities: Implementing game functionalities, integrating third-party libraries, and ensuring secure user account management.
• Scalability & Performance: Designed and implemented microservices architecture for enhanced scalability and performance.

Mobile Development:

• Platforms: Android (Java/Kotlin) and iOS (Objective-C/Swift).
• Game Development: Contributed to game development using Unity/C#/.NET.
• Native Development: Developed native Android/iOS components for specific functionalities.

This experience demonstrates my ability to handle full-stack development, DevOps, and mobile development within a fast-paced environment, contributing to the successful launch and operation of multiple mobile products.

Hired as a full-stack developer, I worked on the National Library of Finland’s open-source E-library project, developing features across the stack. This included backend development with Flask/Python and mobile app development for iOS (Swift) and Android (Kotlin), with a focus on user authentication and other core functionalities.

GitHub links:

• https://www.twine.net/signin
• https://www.twine.net/signin
• https://www.twine.net/signin

Technologies:

• Flask/Python
• iOS (Swift) and Android (Kotlin)

Vooler is a secure video and voice call service designed to provide the end user with remote services from caretakers and other service providers on a single platform.

I was responsible for the complete lifecycle of the project’s infrastructure, security, and architecture, including implementation and operations. Worked closely with the development team as a full-stack engineer and architect, providing development support and architectural guidance.

Technologies:

• Jitsi Meet, WebRTC, Encryption/security
• Kubernetes (DigitalOcean, EKS, OpenStack)
• AWS, CloudWatch, PostgreSQL
• Java Spring, React JS, React Native (Android, iOS)
• OAuth 2.0, Keycloak