Karim Abbes

Experience

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  Loyalty Partner Solutions GmbH

  Sept 2017 - May 2018

  Software Development Intern

  During my time at Loyalty Partner Solutions GmbH, a leading provider of customer management solutions in retail, transportation, and aviation, I contributed to the development and enhancement of their flagship software platform, the Loyalty Management Suite (LMS), which powers renowned loyalty programs like PAYBACK, Deutsche Bahn’s bahn.bonus, and Lufthansa’s Miles & More.Key Contributions:- Designed and developed a concept for integrating Java applications with Siebel CRM, enabling seamless communication between systems.- Created and implemented JUnit tests to ensure robust functionality and reliability of Siebel Business Components.- Developed a Java framework to streamline the integration and utilization of system outputs, enhancing efficiency and maintainability.This role allowed me to sharpen my skills in Java development, CRM integration, and test-driven development while contributing to industry-leading loyalty solutions. Show less

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  Finway

  Sept 2020 - Sept 2024

  As a Full Stack Engineer at finway, I contributed to the development of a GoBD-certified finance operating system for SMEs, ensuring compliance with German financial standards while enhancing scalability and process efficiency. Key achievements include:Feature Development:- Developed core features that improved customer process efficiency by 75% through automated document-to-transaction matching and intuitive workflows.- Integrated with 3rd-party services to reduce tax office workloads by 40% via seamless data transfers.Database & Scalability:- Optimized MongoDB design, migrating from a DB-per-tenant model to a unified database, and reducing query execution times by 50%.Frontend & Infrastructure:- Acted as a frontend specialist, solving complex UI/UX challenges and ensuring a seamless user experience.- Collaborated with DevOps on app deployment in AWS and MongoDB Atlas, maintaining system stability with proactive monitoring via Sentry.Quality Assurance:- Achieved 80%+ test coverage, significantly reducing production bugs and supporting the customer success team to address live issues.Mentorship:- Actively mentored junior developers, providing hands-on guidance, code reviews, and fostering best practices to help them grow technically.Technologies & Tools:- Backend: Node.js, Express.js, MongoDB, Redis, Python- Frontend: React, TypeScript, Tailwind CSS, Redux, TanStack Query- Testing: Karate, Playwright, Mocha, Chai- Infrastructure: AWS, MongoDB Atlas, Docker, Kubernetes- Monitoring: Sentry Show less As a Part-Time Full Stack Developer at finway, I contributed to the development and launch of key product features, driving customer satisfaction and operational efficiency. Key achievements include:- Led the development of an invoice management module with OCR and automation, enabling customers to process 3x more invoices without additional hires.- Contributed to making the frontend responsive, improving user satisfaction across devices.- Played an active role in debugging and reviewing code, ensuring high-quality, maintainable solutions.- Supported the product launch to production and addressed initial customer feedback to refine the product post-launch. Show less

  • Full Stack Engineer

    Oct 2021 - Sept 2024

  • Student Full Stack Engineer

    Sept 2020 - Sept 2021
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  Chair of Application and Middleware Systems, Technical University of Munich (TUM)

  Feb 2021 - Aug 2021

  Distributed Ledger Technologies Intern

  - Designed and implemented HyperledgerLab2, a framework for automating the deployment of a Hyperledger Fabric testbed on Kubernetes clusters provisioned via OpenStack.- Automated infrastructure provisioning with Terraform and enabled deployment of containerized applications using Helm charts and Kubernetes.- Integrated Hyperledger Caliper to benchmark network performance and evaluate metrics such as throughput and latency, achieving up to 1,000 transactions per second with LevelDB and a 9-second average latency for write transactions.- Evaluated the impact of configuration variables (e.g., organizations, peers per organization, batch size) on system performance, optimizing for enterprise-grade scalability.- Enabled flexible configuration of blockchain networks for research experiments, with capabilities for customization and performance evaluation in distributed environments.Key Technologies: Hyperledger Fabric, Kubernetes, OpenStack, Terraform, Hyperledger Caliper, Helm, Docker, LevelDB, CouchDBThesis Summary:This thesis focused on automating the deployment and performance evaluation of Hyperledger Fabric networks in a production-grade cloud environment. It addressed challenges in deploying distributed systems and benchmarking their performance using configurable testbeds. Key contributions included designing a scalable, flexible framework for provisioning cloud resources, deploying blockchain networks, and automating performance measurements. Show less

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  Dïma

  Sept 2021 - now

  Co-Founder & Percussionist

  • Co-founded and built the music band “Dïma,” developing a unique brand identity.• Led communication strategies and digital marketing efforts to grow the band’s online presence.• Gained experience in content creation, audience engagement, and promoting live events.