Freelancer profile translated to English.
Back to original languageAbout Mario
I develop AI-powered automation solutions and scalable web applications. Over 8 years of experience as a Fullstack Engineer (Angular, Node.js/NestJS) — combined with AI integration: OpenAI and Claude APIs, RAG systems, AI agents, and workflow automation with n8n.
Typical projects:
- Process Automation
Replacing manual workflows like quote creation, invoice processing, data maintenance, or reporting with automated workflows — using n8n, APIs, and clean database integration.
- AI Integration into Existing Systems
Chatbots, document analysis, RAG-based knowledge bases, and LLM-powered text processing — embedded into your existing infrastructure.
- Fullstack Development
New development, migration, and expansion of web applications with Angular and NestJS — from REST API design to database architecture.
I support startups and medium-sized companies in automating repetitive processes and using AI productively — not as a prototype, but as a production-ready solution with clean architecture, maintainable code, and clear communication.
Tech Stack
AI & Automation: OpenAI API, Anthropic Claude API, RAG, LangChain, n8n, Make
Frontend: Angular, TypeScript, RxJS, NgRx
Backend: Node.js, NestJS, REST APIs
Databases: MongoDB, PostgreSQL, MySQL
DevOps: Docker
Croatian
Native or bilingual
German
Fluent
English
Fluent
Remote only
Primarily works remotely
Experience
- techmg GmbHFullstack EngineerApril 2019 - Today (7 years and 4 months)Fullstack development of web applications with Angular and Node.js/NestJS. Planning and implementation of REST APIs, database design (MongoDB, MySQL), and CI/CD pipelines. Automation of manual business processes through custom software solutions. Collaboration with clients from the Fintech, SaaS, and digital agency sectors.
- MMM GmbHFull Stack DeveloperDIGITAL AND ITSeptember 2022 - Today (3 years and 11 months)Fullstack development of internal and customer-facing applications: Angular frontend with RxJS and NgRx state management, NestJS backend with REST APIs, database connectivity, and automated tests. Close collaboration with Product Owners and UX teams in agile sprints.
- FintechcubeFull Stack DeveloperDIGITAL AND ITJanuary 2019 - October 2021 (2 years and 10 months)München, GermanyDevelopment of Fintech applications in fullstack: Angular-based SPAs, Node.js microservices, MongoDB/MySQL databases. Integration of external APIs and payment interfaces. Working in a fast-paced startup environment with short release cycles.
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Certifications
- LargeUdemy2019
- Angular Advanced Workshop: Enterprise ArchitecturesAngular Architectures2023