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I'm Cem Karakurt, a Senior Full Stack Engineer based in Berlin, Germany, with 6+ years of experience building scalable web applications using React.js, Node.js, Ruby on Rails, and AWS. I thrive across the full stack, from database design and cloud infrastructure to frontend development and testing. I also enjoy leveraging AI tools to accelerate development and solve complex problems efficiently.…

Cem Karakurt

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

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I'm Cem Karakurt, a Senior Full Stack Engineer based in Berlin, Germany, with 6+ years of experience building scalable web applications using React.js, Node.js, Ruby on Rails, and AWS. I thrive across the full stack, from database design and cloud infrastructure to frontend development and testing. I also enjoy leveraging AI tools to accelerate development and solve complex problems efficiently.…

Available to hire

I’m Cem Karakurt, a Senior Full Stack Engineer based in Berlin, Germany, with 6+ years of experience building scalable web applications using React.js, Node.js, Ruby on Rails, and AWS.

I thrive across the full stack, from database design and cloud infrastructure to frontend development and testing. I also enjoy leveraging AI tools to accelerate development and solve complex problems efficiently.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Language

English

Fluent

Turkish

Fluent

German

Beginner

Work Experience

Senior Full Stack Engineer at Babbel GmbH

June 30, 2025 - June 30, 2025

Owned end-to-end delivery of backend and frontend features, aligned architectural decisions, and improved cross-team collaboration. Facilitated agile ceremonies to enhance team efficiency. Researched and proposed new product features, improved microfrontend architecture, and reduced frontend bundle size by 40% through dependency refactoring to improve load performance.

Software Engineer at 11Sight LLC

December 31, 2021 - December 31, 2021

Implemented Single Sign-On (SSO) with Doorkeeper for centralized authentication across services. Delivered API endpoints, web pages, and background jobs for Ruby on Rails systems. Integrated third-party systems via webhooks and APIs to ensure seamless data exchange. Enhanced autoscaling of recorder services, improving reliability.

Software Engineer at Countly

June 30, 2020 - June 30, 2020

Built React.js SPAs and mobile apps showcasing analytics capabilities for prospective clients. Assisted enterprise customers with analytics integration, improving implementation success and adoption.

Software Engineer at Gatemarine

November 30, 2019 - November 30, 2019

Engineered a real-time tracking platform using Node.js, React.js, and MongoDB. Created internal tools with CodeIgniter and Bootstrap to optimize operational processes. Managed Linux servers, configured NGINX, and maintained deployment pipelines.

Senior Full Stack Engineer at Babbel GmbH

March 1, 2022 - June 1, 2025

Built Full Stack features for the live-lesson platform using AWS Lambda, Step Functions, and React.js, provisioning required infrastructure via Terraform. Led the SmartCat localization discovery and documented the department's Microfrontend architecture. Improved the Microfrontend deployment system to support multi-version rendering on a single page, enabling independent branch deployments. Reduced frontend bundle size by 40% by optimizing third‑party dependencies to enable efficient tree‑shaking. Led technical discovery for E2E frameworks (Playwright vs. Cypress) and implemented initial test suites for booking and subscription flows. Ran agile ceremonies, handled production on-call support, and focused on continuous refactoring and dependency updates.

Remote Software Engineer at 11Sight LLC

August 1, 2020 - December 1, 2021

Implemented a centralized SSO provider using Doorkeeper to sync authentication across multiple products. Built a reporting system for group meetings by creating custom Prosody modules that integrated Jitsi events with Ruby on Rails APIs and dashboards. Created a feature-management system for organizations to toggle platform services (e.g., recording, transcription) through the main dashboard and Jitsi UI. Managed AWS EC2 Auto Scaling for recording services and handled deployments and server maintenance for Jitsi-based products. Developed RESTful APIs and background jobs with Sidekiq, maintaining test coverage and automated Swagger documentation via RSpec.

Software Engineer at Countly

December 1, 2019 - June 1, 2020

Built demo SPAs (React.js) and a mobile app (Swift) showcasing analytics features like session tracking, funnels, and user segmentation. Provided technical support to enterprise customers integrating Countly SDK.