Constantin Amundsen

Software Engineer

Check out CV ↗

Skills

  • Golang 6 Years
  • Other Languages 1-2 Years
    • JavaScript
    • Typescript
    • Ruby
    • Python
    • PHP5
  • AWS 4 Years
    • AWS CDK
    • Serverless Framework
    • Cloudformation

Languages

  • German Mothertongue
  • English Fluent
  • Norwegian Mothertongue
  • Italian Mothertongue

Certifications

Experience

  • Senior Software Engineer

    Amboss SE ↗
    May 2025 - December 2025 Torstraße 19, 10119 Berlin

    Work on Software, Developer Experience, Tooling and Infrastructure related Projects:

    • New Authentication System

    • Implementing NATS as a message bus for event driven architecture for all teams

    • Mentoring on new Tooling and Applications to improve teams

  • Software Engineer

    Home24 SE ↗
    August 2020 - April 2025 Otto-Ostrowski-Straße 3, 10249 Berlin

    Development of a Multinational Webshop Platform

    • Design and Implementation:
      Design and implementation of microservices using AWS CDK and Cloudformation.

    • Performance Optimization:
      Optimized latency for serverless configurations and migrated to more cost-effective platforms and deployment methods.

    • Third-Party Integrations:
      Managed integrations with third-party APIs, ensuring a comprehensive solution for monitoring, alerting, and caching.

    • Microservice Modernization:
      Led refactoring and re-deployment of a microservice for managing and displaying user reviews using the Serverless Framework.

    • GraphQL API Development:
      Developed and expanded the central GraphQL API to integrate new microservices.

    • Redis Optimization:
      Improved Redis caching and enhanced real-time data synchronization with third-party providers.

    Automation, Testing, and Reliability

    • CI/CD Enhancements:
      Introduced and improved CI/CD pipelines using CircleCI for optimized deployment processes.

    • Testing Practices:
      Enhanced testing practices to ensure high reliability.

    • API Documentation:
      Established comprehensive API documentation using Postman for the team.

    • Standardization:
      Standardized development, testing, observability, and collaboration practices within the team.

    Mentoring and Talent Development

    • Team Training:
      Mentored and trained new team members in AWS, Go, and team standards.

    • Knowledge Sharing:
      Planned technical requirements and ensured continuous knowledge transfer within the team.

Notable Work

  • Minor open source PRs

    <p>Minor Pullrequests for opensource projects that I used.</p>

  • Distributed Computing Library for Golang

    <p>I built a small library that makes Monoliths scalable by default through cluster networking and internal services like distributed Caching, Storage and Messaging.</p>

  • Rewrite of productlisting logic

    January 2023 - May 2023

    <p>For Home24 I had the responsiblity to rewrite a substantial Part of the product listing logic to enable fast Product Listing Pages, Filtering and personalized experiences for the users. Handles ~25k rpm with a max recorded load of ~70k rpm.</p>

  • Selfhosted Projects

    <p>I build and Selfhost solutions for my personal use and for learning.</p>