20.08.2026 aktualisiert

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Senior Full-Stack Software Engineer

Rackwitz, Deutschland
Nur Remote
Master of Science
Rackwitz, Deutschland
Nur Remote
Master of Science

Profilanlagen

CV_Martin_Grumbt.pdf

Über mich

Senior Full-Stack-Entwickler mit über 10 Jahren Erfahrung in der Entwicklung von Web- und Mobile-Anwendungen. Spezialisiert auf React, TypeScript, verschiedenen Backends und modernen Cloud-Architekturen. Starke Kompetenz in Refactoring, Skalierbarkeit und langfristiger Codequalität.

Skills

StorybookGitHub ActionsTailwind CSSVitestViteHTMLJavaJavaScriptPHPCSSContinuous DeliveryContinuous IntegrationWeb EntwicklungGitHubHypertext Transfer Protocols (HTTP)JSONPythonLDAPPostgreSQLMariaDBMongoDBMySQLNode.jsSoftware ArchitectureAngular 2+Next.jsJson Web TokenSamlSoftware DesignSQLTypeScriptReact.jsPHPUnitCypressBackendGitKotlinInfluxDBCassandraFull Stack EntwicklungGraphQLFront EndReact ReduxDocker
About me

Senior Full-Stack Software Engineer with 10+ years of experience designing and delivering scalable soft-
ware solutions for startups and enterprise clients.
Expertise in software architecture, full-stack engineering, system modernization, and cloud-native applica-
tion development. Proven ability to translate complex business requirements into scalable, maintainable
software while driving technical decisions from architecture through delivery.
Experienced in designing backend services, RESTful APIs, cloud-native applications, and system integra-
tion solutions across modern software platforms. Actively leveraging AI-assisted software engineering
and modern development tools to accelerate software delivery, technical research, and problem solving.

  1. Software Architecture
  2. Software Design
  3. Full-Stack Development
  4. Custom Software Development
  5. API & System Integration
  6. Technical Leadership
  7. AI-assisted Development
  8. Cloud & DevOps

Skills

Frontend: React • Next.js • TypeScript • Angular • Redux Toolkit • Zustand • JavaScript (ES6+) • HTML5 • CSS3/SCSS

Backend: PHP (Symfony) • Node.js (Express) • Python • Java (Spring Boot) • Kotlin

Databases: PostgreSQL • MySQL • MariaDB • Cassandra • InfluxDB • MongoDB • Firestore • SQL

Testing: React Testing Library • Jest • Vitest • Cypress • Storybook • PHPUnit

DevOps: Docker • AWS • Digital Ocean • Git • GitHub Actions • CI/CD

Data & Protocols: HTTP/JSON • REST • GraphQL • Web3 (ethers.js) • SAML • LDAP

Erfahrung

Berufserfahrungmehr als 10 Jahre
Freelancer seit2022

Sprachen

DeutschMutterspracheEnglischverhandlungssicherRussischGrundkenntnisse

Projekthistorie

Senior Full-Stack Software Engineer

Door Configurator Platform
- Led the end-to-end development of a scalable door configurator platform, acting as primary technical partner and translating business requirements into system architecture.
- Designed a rule engine to handle complex configuration dependencies and validation across multiple product dimensions.
- Reverse-engineered and rebuilt a complex rendering system to enable dynamic, real-time product visualization with high accuracy.
- Designed and implemented backend services including admin dashboard, support workflows, and tenant-based access with role-based features and tenant-specific pricing models.
- Defined versioned REST APIs for catalog, pricing, offers, and order processing, ensuring extensibility and long-term maintainability.

Senior Full-Stack Developer

Freelance Consultant
- Led the modernization of a large legacy codebase, migrating it to React, TypeScript, and a more maintainable architecture.
- Refactored backend APIs and PHP services to improve structure, performance, and long-term maintainability.
- Extended Cassandra and InfluxDB usage to support analytics and monitoring requirements.
- Designed and implemented interactive dashboards, improving usability and data accessibility.
- Coordinated testing, performance tuning, and code reviews to ensure stable and reliable releases.
- Worked closely with stakeholders to align technical decisions with evolving product needs.

Blockchain Developer

Direct Client
- Developed an avatar-based engagement platform with NFT and wallet integration.
- Delivered intuitive user interfaces and improved interaction flows.
- 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.

Mobile App Developer

Freelance Consultant
- Developed a cross-platform Flutter app (iOS, Android) to manage OpenWrt-based routers.
- Integrated backend communication via HTTP, LuCI, and Ubus protocols.
- Published the app to Apple App Store and Google Play, ensuring compliance with guidelines.
- Set up CI/CD pipelines for automated builds and streamlined release management.
- Designed UX flows to make router administration accessible to non-technical users.

Full-Stack Developer

Chemmedia AG
- 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.

Web Developer

TU Chemnitz
- Built and maintained faculty websites (TYPO3, PHP, MySQL).
- Developed interactive components with OpenLayers and JavaScript.
- Improved accessibility and responsiveness.

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