Senior Full-Stack Developer & DevOps Engineer with 10+ years of experience building and maintaining robust, scalable web applications. Expertise in cloud technologies (AWS, Azure, DigitalOcean). Proven ability to deliver high-quality solutions from design to deployment, emphasizing security best practices. Experienced in Kubernetes, Docker, and CI/CD. Passionate about translating business needs into effective technical solutions. - Full-Stack Development (Python, JavaScript, TypeScript, Java, Kotlin, C#, Swift) - DevOps Engineering (Kubernetes, Docker, CI/CD) - Cloud Expertise (AWS, Azure, DigitalOcean) - 10+ Years Experience - Security-Focused - Mobile & Web Development - Business-Oriented

Johannes Ylönen

Senior Full-Stack Developer & DevOps Engineer with 10+ years of experience building and maintaining robust, scalable web applications. Expertise in cloud technologies (AWS, Azure, DigitalOcean). Proven ability to deliver high-quality solutions from design to deployment, emphasizing security best practices. Experienced in Kubernetes, Docker, and CI/CD. Passionate about translating business needs into effective technical solutions. - Full-Stack Development (Python, JavaScript, TypeScript, Java, Kotlin, C#, Swift) - DevOps Engineering (Kubernetes, Docker, CI/CD) - Cloud Expertise (AWS, Azure, DigitalOcean) - 10+ Years Experience - Security-Focused - Mobile & Web Development - Business-Oriented

Available to hire

Senior Full-Stack Developer & DevOps Engineer with 10+ years of experience building and maintaining robust, scalable web applications. Expertise in cloud technologies (AWS, Azure, DigitalOcean). Proven ability to deliver high-quality solutions from design to deployment, emphasizing security best practices. Experienced in Kubernetes, Docker, and CI/CD. Passionate about translating business needs into effective technical solutions.

  • Full-Stack Development (Python, JavaScript, TypeScript, Java, Kotlin, C#, Swift)
  • DevOps Engineering (Kubernetes, Docker, CI/CD)
  • Cloud Expertise (AWS, Azure, DigitalOcean)
  • 10+ Years Experience
  • Security-Focused
  • Mobile & Web Development
  • Business-Oriented
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Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Beginner
Beginner
Beginner
Beginner
Beginner
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Language

English
Fluent
Finnish
Fluent
Swedish
Intermediate

Work Experience

Add your work experience history here.

Education

Bachelor of Science at Turku University of Applied Sciences
August 15, 2011 - May 31, 2016
Information Technology
Master of Science in Technology (incomplete) at University of Turku
August 15, 2016 - January 31, 2026
Major in Computer Software Engineering, Minor in Entrepreneurship, Incomplete: Master's thesis not pursued

Qualifications

Add your qualifications or awards here.

Industry Experience

Software & Internet, Education, Gaming, Computers & Electronics, Media & Entertainment, Telecommunications, Retail, Other
    paper Moomin Mobile games and apps

    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.

    paper Vooler Video Chat

    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