Dopamining: Social Entrepreneurship
Building a mobile application for AI-powered fitness tracking & habit building
ReactPythonSwiftSolidity+2
View project
Currently building brixl
Sascha Nievelstein
Co-Founder of brixl — an AI tender platform for the German construction industry. Computer scientist and entrepreneur based in Aachen.
Co-Founder
brixl · EXIST-funded
M.Sc.
RWTH Aachen
Published
IEEE BCCA 2025
Currently
brixl
brixl is an AI-powered tender platform built specifically for the German construction industry. We aggregate public construction tenders from 100+ sources, automate requirement analysis, and help engineering firms, general contractors, and specialist trades win more building contracts with less manual work.
Co-founded with Robin Karutz in 2025. Based in Aachen. Supported by the EXIST programme, the German Federal Ministry for Economics, and the European Union.
- Role
- Co-Founder
- Founded
- 2025
- Location
- Aachen, Germany
- Sector
- AI · Construction
- Funding
- EXIST · BMWi · EU
Expertise
How I work
Six years of building production software across AI, web, and blockchain — most recently applied to construction-industry workflows at brixl.
AI & Machine Learning
LLM integration, retrieval pipelines, and applied ML for document understanding and automation.
- LLMs & RAG
- Document AI
- Predictive analytics
- Python · PyTorch
Full-Stack Engineering
Production web applications from data layer to interface, with a focus on developer velocity.
- React · Next.js
- Node.js · Python
- PostgreSQL · MongoDB
- AWS · GCP
Blockchain & Web3
Research and production work on smart contracts, decentralised systems, and token mechanics.
- Solidity
- Ethers.js · Web3.js
- DeFi & token design
- Published IEEE research
Selected work
Projects & research
A selection of past ventures, side-projects, and academic work — alongside ongoing efforts at brixl.
LMGTFY: Let Me Google That For You
A fun and playful website that helps people learn to search for themselves - with style and a touch of humor.
ReactTailwindCSSJavaScriptWeb APIs
View project
MoreThanCode: AI Music
Website featuring my own AI-generated music, including an advent calendar of musical experiments.
React.jsWebdesignAI Music GenerationSong writing
View project
Crypto Market Dashboard
Real-time cryptocurrency analysis dashboard featuring interactive charts, market statistics, and trend visualization.
ReactRechartsFramer MotionTailwindCSS
View project
Research
View on IEEE Xplore
Published · IEEE BCCA 2025
ChainShare: Blockchain Document Sharing
Published master thesis research on blockchain-based ecosystem for fair and ownership-preserving document-sharing in LLM use cases. Published in the proceedings of BCCA 2025 - The 7th International Conference on Blockchain Computing and Applications.
BlockchainLLMsSmart ContractsReact+3
FairProfit: Supply Chain Transparency
Blockchain-based system enabling transparent and fair profit distribution across supply chains, developed as bachelor thesis at RWTH Aachen
ReactSolidityIPFSMetaMask+2
About
Background
Computer scientist and entrepreneur. Co-Founder of brixl. Trained across engineering, economics, and applied research at RWTH Aachen, EPFL, and Yonsei.
Experience
- 2025 – Present
- 2024 – 2025ResearcherFraunhofer FIT
Master thesis on blockchain document sharing for LLMs. Paper published at IEEE BCCA 2025.
- 2024Visiting AssociateBoston Consulting Group
ERP diagnostics and digital transformation engagements.
- 2023 – 2024Technical Venture AnalystFreigeist
Seed and Pre-Series A technology investments.
- 2022 – 2023Full-Stack Developer & AI EngineerDopamining
Blockchain and AI features for a habit-tracking platform.
- 2021 – PresentSoftware Developer & ConsultantFreelance
Full-stack development and technical consulting for early-stage companies.
Education
- 2022 – 2025M.Sc. Computer ScienceRWTH Aachen University
Thesis: ChainShare — Blockchain-Based Document Sharing for LLMs. Published at IEEE BCCA 2025.
- 2022 – 2025M.Sc. Management & EconomicsRWTH Aachen University
- Feb 2025 – Jun 2025M.Sc. Economics & Finance — ExchangeYonsei University
- 2022B.Sc. Computer Science — ExchangeEPFL
- 2019 – 2022B.Sc. Computer ScienceRWTH Aachen University
Thesis: Blockchain-based payment for fair profit distribution.