I'm a versatile software developer with a passion for blockchain technology and open source contributions. My work spans across multiple domains, from IoT and cloud infrastructure to blockchain development, with a particular focus on the Stellar ecosystem.
Currently working at OTTO GmbH & Co. KG, one of Europe's largest e-commerce companies, where I contribute to both internal enterprise platforms (otto-ec) and public open source initiatives (otto-de).
Enterprise E-Commerce Development (otto-ec)
- Building and maintaining microservices and serverless architectures for large-scale e-commerce operations serving millions of customers
- Developing internal tools and automation solutions for platform reliability, monitoring, and DevOps workflows
- Contributing to infrastructure modernization initiatives, migrating legacy systems to cloud-native architectures
- Implementing event-driven architectures using AWS EventBridge, Lambda, and API Gateway for real-time data processing
- Working with modern tech stack including TypeScript, Node.js, AWS services, and serverless frameworks
- Participating in agile cross-functional teams with focus on continuous delivery and deployment
- Performance optimization and scalability improvements for high-traffic e-commerce systems
Open Source Initiatives (otto-de)
- Maintaining public GitHub Actions and automation tools used by the wider developer community
- Contributing to OTTO's open source ecosystem, fostering knowledge sharing and community engagement
- Notable contribution: purge-deprecated-workflow-runs - a GitHub Marketplace action for workflow management with production use across multiple organizations
- Collaborating on developer tooling and CI/CD improvements that benefit both internal teams and external users
Languages & Frameworks:
- TypeScript, JavaScript, Node.js - Primary development languages for backend services and tooling
- Experience with polyglot environments and modern web technologies
- Working knowledge of Python for data processing and automation scripts
Cloud & Infrastructure:
- AWS services: Lambda, CDK, API Gateway, EventBridge, DynamoDB, S3, CloudWatch
- Serverless architectures and microservices design patterns
- Infrastructure as Code (AWS CDK, CloudFormation) for reproducible deployments
- Container orchestration and deployment strategies
DevOps & Automation:
- GitHub Actions development and CI/CD pipeline optimization
- Workflow automation and developer productivity tools
- Build tooling (Vercel ncc, npm, TypeScript compiler)
- Monitoring and observability setup with CloudWatch and custom metrics
Software Engineering Practices:
- Security-first development (CodeQL, vulnerability management, minimal permissions, OWASP principles)
- Comprehensive testing strategies (unit, integration, end-to-end) and quality assurance
- Technical documentation and API design following REST principles
- Agile development in cross-functional teams with regular sprint cycles
- Code review practices and mentoring junior developers
Impact:
- Contributing to systems serving millions of customers in one of Europe's largest e-commerce platforms
- Developing tools that improve developer productivity and platform reliability across teams
- Balancing enterprise-grade solutions with open source community contributions
- Driving technical decisions for service architecture and technology stack choices
I'm deeply engaged in the Stellar Development Foundation ecosystem, contributing to various projects:
- stellar-claim - A TypeScript tool to claim balances on the Stellar network
- stellar-resolve-claimant-predicates - JS module to resolve claimant predicates to flattened representation
- Soroban Smart Contracts - Participating in Sorobanathon and contributing to Soroban Quest projects
- Active contributor to Stellar SDK, documentation, and tooling improvements
With 135+ pull requests and 36+ issues across various repositories, I actively contribute to the open source community:
- OTTO (otto-de) - Enterprise e-commerce development and open source automation tools
- Stellar ecosystem (35+ PRs) - Multiple contributions to Stellar tooling and documentation
- DefinitelyTyped - Improved TypeScript type definitions for Node.js streams
- aws-samples/cdk-image-pipeline - AWS CDK infrastructure improvements
- pytoyoda/ha_toyota - Home Assistant Toyota integration
- 📊 Reported and fixed issues in stellar/js-stellar-sdk, stellar/freighter, stellar/rs-soroban-sdk
- 🔧 Filed issues in major projects like actions/setup-go, DefinitelyTyped, dependabot
- 💡 Proposed features for stellar/laboratory and other Stellar tools
- 🏢 Professional: AWS (Lambda, CDK, API Gateway, DynamoDB), TypeScript, Node.js, Microservices, Serverless, GitHub Actions
- 🔗 Blockchain: Stellar, Soroban Smart Contracts
- ☁️ Cloud: AWS CDK, Infrastructure as Code, CloudFormation
- 🏠 IoT: Home Assistant integrations, Arduino, MQTT
- 🤖 DevOps: CI/CD, Docker, Portainer, Workflow Management, Build Automation
- 🛠️ Tools: npm, Vercel ncc, TypeScript compiler, Rust toolchain
Beyond blockchain, I've worked on a wide variety of projects demonstrating my versatility:
- 🚗 Automotive IoT - Toyota vehicle integration with Home Assistant
- ⚡ Energy Monitoring - neurio-2-mqtt - MQTT bridge for energy sensors
- 📱 Mobile Development - FreeCars app for car-sharing services (Windows Phone)
- 🤖 Automation - GitHub Actions, PM2 deployment tools
- 🔐 Security - Contributing to CodeQL security scanning improvements
- 🏠 IoT & Home Automation - Arduino projects, MQTT integrations
- 💼 Enterprise E-Commerce Developer @ OTTO: Contributing to large-scale platform serving millions of customers
- 🔧 Full-Stack Engineer: Building serverless microservices, automation tools, and DevOps infrastructure
- 🌐 Open Source Contributor: Active in both enterprise open source (otto-de) and community projects (135+ PRs, 36+ issues)
- 🌟 Blockchain Specialist: Deep involvement in Stellar ecosystem with production tools and smart contracts
- 🛠️ DevOps Automation: Creating developer productivity tools and CI/CD solutions
- 🔐 Security-Conscious: Implementing best practices in CodeQL, vulnerability management, and secure architecture
- 📚 Technical Communicator: Documentation, API design, and knowledge sharing across teams
- 🌐 GitHub: @hanseartic
- 🌟 Check out my Stellar projects
- 💼 Open to collaboration on blockchain and open source projects!
"Contributing to open source, one commit at a time, with a special focus on making blockchain technology more accessible."