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Martin GrumbtMG

Martin Grumbt

Senior Full-Stack Software Engineer - Freelance

€600/day
Leipzig, DE
8-15 years

Average response time: 1 hour

About Martin

Senior Full-Stack Developer with 10+ years of experience delivering web and mobile applications across diverse industries. Specialized in React, TypeScript, Node.js and modern cloud environments, with strong expertise in refactoring and improving legacy systems for performance and maintainability. Experienced in mentoring and cross-functional collaboration, thriving in distributed teams and continuously adapting to new technologies. Driven by clean architecture, scalability, and long-term code quality.
  • German

    Native or bilingual

  • English

    Fluent

  • Russian

    Basic

Can work on-site
Leipzig (up to 50km)

Experience

  • Chemmedia AG
    Enterprise E-Learning Platform
    EDUCATION AND E-LEARNING
    April 2016 - October 2021 (5 years and 6 months)
    Chemnitz, Germany
    - Developed an enterprise e-learning platform across frontend, backend, and mobile apps

    - Integrated APIs and authentication (SAML, LDAP)
    - Delivered cross-platform mobile apps with React Native (iOS & Android)
    - Mentored junior developers and carried out code reviews

    Stack:

    React Native • Angular • Docker • TypeScript • Bootstrap • HTML5 • CSS3 • XML • JavaScript • jQuery • D3.js • GulpJS • Weblate • PHP • Composer • Symfony • SQL • MySQL • MariaDB • SAML • LDAP
    Angular Docker Bootstrap MySQL/MariaDB PHP
  • TU Chemnitz
    Faculty & Institute Websites
    EDUCATION AND E-LEARNING
    September 2015 - December 2018 (3 years and 3 months)
    Chemnitz, Germany
    - Built and maintained faculty websites (TYPO3, PHP, MySQL)
    - Developed interactive components with OpenLayers and JavaScript
    - Improved accessibility and responsiveness

    Stack:

    Bootstrap • HTML5 • CSS3 • JavaScript • OpenLayers • jQuery • PHP • TYPO3 • SQL • MySQL • RSS
    Bootstrap HTML5 OpenLayers PHP MySQL
  • Fanhouse Digital GmbH
    Blockchain Engagement Platform
    SPORTS
    October 2022 - December 2023 (1 year and 2 months)
    München, Germany
    - Developed an avatar-based engagement platform with NFT and wallet integration
    - Delivered end-to-end features from estimation through deployment
    - Implemented secure wallet signing with ethers.js and optimized transaction flows
    - Performed code reviews, improved frontend performance, and coordinated releases
    - Collaborated with stakeholders to refine product requirements and UX

    Stack:

    React • Redux • Redux Toolkit • HTML5 • CSS3 • SCSS • MUI • JavaScript • ethers.js • Kotlin • Docker • Digital Ocean • JIRA • Zeplin • Sketch • Notion • Microsoft Teams
    React.js redux Ethers.js Atlassian JIRA Microsoft Teams

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Education

  • Bachelor of Science
    Technische Universität Chemnitz
    2021
    Angewandte Informatik
  • Master of Science
    Technische Universität Chemnitz
    2014
    Chemie

Skill set

Categories