Twine
Twine

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…

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#,…

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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Skills

Experience Level

Python
Expert
API
Expert
Script
Expert
Kubernetes
Expert
bash
Expert
Bootstrap
Expert
HTML5
Expert
Github
Expert
Docker
Expert
CSS
Expert
Android
Expert
JavaScript
Expert
iOS
Expert
Django
Expert
AWS
Expert
Java
Expert
jQuery
Expert
PostgreSQL
Intermediate
C#
Intermediate
Azure
Intermediate
React JS
Intermediate
.NET
Intermediate
C++
Intermediate
TypeScript
Intermediate
Swift
Intermediate
Unity 3D
Intermediate
Spring
Intermediate
WordPress
Intermediate
Qt
Intermediate
SQLite
Intermediate
Kotlin
Intermediate
PHP
Intermediate
Objective-C
Intermediate
Node.js
Intermediate
MySQL
Intermediate
VMware
Intermediate
Dart
Intermediate
React Native
Beginner
Selenium
Beginner
Google Cloud
Beginner
Drupal
Beginner
Lua
Beginner
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Language

English
Fluent
Finnish
Fluent
Swedish
Intermediate

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
    uniE613 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…
    uniE613 E-library by National Library of Finland
    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)
    uniE613 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