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I'm Demian Lienert, a certified IT specialist with a modern professional background in systems engineering and platform development, as well as over 25 years of intensive, self-directed technical experience in IT, development, automation, and digital systems. My focus is on modern full-stack solutions, AI-powered workflows, RAG systems, and production-ready technical architectures that ensure structure, efficiency, and reliability in complex environments. As a freelance full-stack developer and AI workflow specialist, I design and implement modular solutions with a focus on automation, AI integration, and structured system logic. I build multi-stage AI workflows with agents, code nodes, retrieval logic, and multi-channel output. I develop demonstrators and production-ready solutions for analytics, research, and reporting applications, and maintain a public technical presence through my website, GitHub, and documented workflow systems.…I'm Demian Lienert, a certified IT specialist with a modern professional background in systems engineering and platform development, as well as over 25 years of intensive, self-directed technical experience in IT, development, automation, and digital systems. My focus is on modern full-stack solutions, AI-powered workflows, RAG systems, and production-ready technical architectures that ensure structure, efficiency, and reliability in complex environments. As a freelance full-stack developer and AI workflow specialist, I design and implement modular solutions with a focus on automation, AI integration, and structured system logic. I build multi-stage AI workflows with agents, code nodes, retrieval logic, and multi-channel output. I develop demonstrators and production-ready solutions for analytics, research, and reporting applications, and maintain a public technical presence through my website, GitHub, and documented workflow systems.

Demian Lienert

Full Stack Developer, Web Developer, Back-End Developer, +7

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I'm Demian Lienert, a certified IT specialist with a modern professional background in systems engineering and platform development, as well as over 25 years of intensive, self-directed technical experience in IT, development, automation, and digital systems. My focus is on modern full-stack solutions, AI-powered workflows, RAG systems, and production-ready technical architectures that ensure structure, efficiency, and reliability in complex environments. As a freelance full-stack developer and AI workflow specialist, I design and implement modular solutions with a focus on automation, AI integration, and structured system logic. I build multi-stage AI workflows with agents, code nodes, retrieval logic, and multi-channel output. I develop demonstrators and production-ready solutions for analytics, research, and reporting applications, and maintain a public technical presence through my website, GitHub, and documented workflow systems.…I'm Demian Lienert, a certified IT specialist with a modern professional background in systems engineering and platform development, as well as over 25 years of intensive, self-directed technical experience in IT, development, automation, and digital systems. My focus is on modern full-stack solutions, AI-powered workflows, RAG systems, and production-ready technical architectures that ensure structure, efficiency, and reliability in complex environments. As a freelance full-stack developer and AI workflow specialist, I design and implement modular solutions with a focus on automation, AI integration, and structured system logic. I build multi-stage AI workflows with agents, code nodes, retrieval logic, and multi-channel output. I develop demonstrators and production-ready solutions for analytics, research, and reporting applications, and maintain a public technical presence through my website, GitHub, and documented workflow systems.

Available to hire

I’m Demian Lienert, a certified IT specialist with a modern professional background in systems engineering and platform development, as well as over 25 years of intensive, self-directed technical experience in IT, development, automation, and digital systems. My focus is on modern full-stack solutions, AI-powered workflows, RAG systems, and production-ready technical architectures that ensure structure, efficiency, and reliability in complex environments.

As a freelance full-stack developer and AI workflow specialist, I design and implement modular solutions with a focus on automation, AI integration, and structured system logic. I build multi-stage AI workflows with agents, code nodes, retrieval logic, and multi-channel output. I develop demonstrators and production-ready solutions for analytics, research, and reporting applications, and maintain a public technical presence through my website, GitHub, and documented workflow systems.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

German

Fluent

English

Advanced

Work Experience

Freiberuflicher Fullstack-Entwickler & Spezialist für AI-Workflows at Self-employed / Independent

January 1, 2023 - Present

Entwickle modulare Fullstack- und Workflow-Lösungen mit Fokus auf Automatisierung, AI-Integration und strukturierte Systemlogik. Konzeption und Umsetzung mehrstufiger AI-Workflows mit Agenten, Code-Nodes, Retrieval-Logik und Multi-Channel Output. Entwicklung technischer Demonstratoren und produktionsnaher Lösungen für Analyse-, Research- und Reporting-Anwendungsfälle. Aufbau einer öffentlichen technischen Positionierung über Website, GitHub und dokumentierte Workflow-Systeme.

Informatiker EFZ – Systemtechnik & Plattformentwicklung at Rafisa Informatik GmbH

March 1, 2024 - May 1, 2025

Mitarbeit an Systemtechnik- und Plattformentwicklungsaufgaben im professionellen Unternehmensumfeld. Aufbau eines Enterprise-RAG-Systems mit llama.cpp für 10.000+ Dokumente. Umsetzung von Python-Microservices mit ChromaDB- und FAISS-Vektordatenbanken. Arbeit mit Proxmox VE Cluster, GPU-Passthrough und ML-nahen Infrastruktur-Setups.

Technical Support Praktikant at bexio AG

August 1, 2022 - July 31, 2023

Schnittstelle zwischen 2nd-/3rd-Level-Support, Entwicklung und Management. Unterstützung bei SQL-bezogenen Optimierungen sowie technischen Support-Prozessen. Mitarbeit in Python-basierter Automatisierung rund um das Developer Environment. Einblicke in GCP-nahe Administration und strukturierte technische Betriebsabläufe.

Informatiker – Diverse Praktika at Various

January 1, 2019 - December 31, 2021

Diverse Praktika im IT-Bereich: Unterstützung von Softwareprojekten, Support- und Testaktivitäten, Mitarbeit in IT-Administration.

Diverse Anstellungen im Kundendienst at Various

January 1, 2012 - December 31, 2019

Verschiedene Positionen im Kundendienst mit Fokus auf Kundenberatung, Problemlösung und Supportprozesse; Zusammenarbeit in diversen Teams. Kommunikation in Deutsch und Englisch.

Diverse Anstellungen im Detailhandel at Maßgeblich im Detailhandel

January 1, 2006 - December 31, 2011

Verschiedene Tätigkeiten im Detailhandel; Kundenbetreuung, Verkauf, Warenpräsentation; Entwicklung von Serviceprozessen.

Freiberuflicher Fullstack-Entwickler & Spezialist für AI-Workflows at Selbstständig, International

January 1, 2023 - Present

Entwicklung modularer Fullstack- und Workflow-Lösungen mit Fokus auf Automatisierung, AI-Integration und strukturierte Systemlogik. Konzeption und Umsetzung mehrstufiger AI-Workflows mit Agenten, Code-Nodes, Retrieval-Logik und Multi-Channel-Output. Entwicklung technischer Demonstratoren und produktionsnaher Lösungen für Analyse-, Research- und Reporting-Anwendungsfälle. Aufbau einer öffentlichen technischen Positionierung über Website, GitHub und dokumentierte Workflow-Systeme.

Informatiker EFZ – Systemtechnik & Plattformentwicklung at Rafisa Informatik GmbH, Dietikon

March 1, 2024 - May 1, 2025

Technical Support Praktikant at bexio AG, Rapperswil-Jona

August 1, 2022 - July 1, 2023

Schnittstelle zwischen 2nd-/3rd-Level-Support, Entwicklung und Management. Unterstützung bei SQL-bezogenen Optimierungen sowie technischen Support-Prozessen. Mitarbeit in Python-basierter Automatisierung rund um das Developer Environment. Einblicke in GCP-nahen Administration und strukturierte technische Betriebsabläufe.

Divers Praktika als Informatiker

January 1, 2019 - January 1, 2021

Verschiedene Praktika in der Informatik; praktische Erfahrungen in Entwicklung, Support und IT-Operations.

Divers Anstellungen im Kundendienst

January 1, 2012 - January 1, 2019

Kundendienstpositionen mit technischen Hintergrund; Kundenbetreuung, Problemlösung und Supportprozesse.

Divers Anstellungen im Detailhandel

January 1, 2006 - January 1, 2011

Verschiedene Anstellungen im Detailhandel.

Education

Informatiker EFZ – Systemtechnik at WISS St. Gallen

August 1, 2022 - June 1, 2025

Kaufm. Grundbildung & Handelsdiplom at Benedict-Schulen St. Gallen

January 1, 2012 - December 31, 2012

Detailhandelsfachmann EFZ at Maagtechnic AG, Dübendorf

August 1, 2003 - July 1, 2006

Informatiker EFZ – Systemtechnik at WISS St. Gallen / bexio AG / Rafisa Informatik

August 1, 2022 - June 1, 2025

Kaufm. Grundbildung & Handelsdiplom at Benedict-Schulen St. Gallen

January 1, 2012 - January 1, 2012

Detailhandelsfachmann EFZ at Maagtechnic AG, Dübendorf

August 1, 2003 - July 1, 2006

Qualifications

Docker Certification Course

June 1, 2023 - April 4, 2026

Git Certification Course

November 1, 2022 - April 4, 2026

Java Certification Course