David Danko

Developing practical IT courses, building automated developer environments (ecorp), maintaining custom Docker architectures (Homestack), and advocating for self-hosting and FOSS philosophy.

Managed corporate GitLab environments, designed complex CI/CD pipeline infrastructure, automated server deployments via Ansible.

Engineered high-performance Java backend solutions, database optimizations, and web scraping utilities. Developed complete solutions with scaling, software design and architecture.

Key Projects:

• Web AETR compliance system: A complex web-based system for commercial road transport compliance (AETR, Labour Code), unifying data analysis from digital files, analog tachograph discs, and manual entries.
Key achievements:
• Built a custom DDD file parser from scratch in Java to decode and process binary tachograph data. See video (HU)
• Developed a computer vision algorithm for tachograph disc recognition without machine learning, relying purely on signal processing, statistical analysis, and classic image processing techniques. See video (HU)
• Implemented a complex compliance-checking engine based on the EU road transport social legislation (Regulation (EC) No 561/2006). See video (HU)
• Programmed business logic to ensure compliance with the Hungarian Labour Code, processing work hours data for automated payroll exports.
• Designed and built a full-stack web interface to manage entities, track data sources, run missing-data checks, and generate automated audit logs.
• Handled full-lifecycle DevOps tasks, including maintaining, upgrading, and managing pre-production and production Linux server deployments and databases.
• Web Tachograph training simulator: Interactive, browser-based tachograph simulation platform for driver training, featuring multi-device replication and scenario evaluation.
Key achievements:
• Built an interactive tachograph simulator reproducing 4 distinct physical devices with unique UI layouts, nested menu hierarchies, and realistic behaviors. See project
• Engineered an Event-Driven State Machine (EDSM) to evaluate 45+ complex scenarios, providing real-time validation, strict error handling, and recovery checkpoints. See video
• Programmed a custom dot-matrix display engine from scratch using a low-level display buffer rendered on an HTML5 Canvas, manually editing character bitmaps.
• Developed a time-tick-based simulation engine supporting variable execution speeds (speed up/slow down), real-time pausing, and complete session save/restore states.
• Implemented user monetization features with real-time token/time depletion that automatically suspends simulations upon expiration or network disconnects.
• Architected a massive full-stack Java codebase (600+ classes) using TeaVM to transpile the frontend into hyper-fast, procedurally generated JavaScript with zero HTML templates.
• Zsibvásár Auction Portal: Comprehensive web-based auction and marketplace platform serving as a high-volume alternative to market leaders in Hungary.
Key achievements:
• Maintained full-stack system architecture, managing Linux servers, Apache/Tomcat environments, MySQL databases, and high-deliverability mail servers. See project
• Architected and optimized an enterprise Apache Solr-based full-text search engine with multi-criteria filtering and real-time autocomplete suggestions.
• Developed automated product import engines supporting data ingestion from diverse third-party e-commerce platforms (Unas, Shoprenter, Vatera, and custom CSVs).
• Engineered a scalable marketing automation system capable of preparing and broadcasting newsletters to 160,000+ subscribers per campaign.
• Implemented core business and monetization features, including a transaction-based commission engine and automated invoicing/payment integrations (Számlázz.hu, OTP Mobil).
• Orchestrated three major frontend evolutionary overhauls, converting raw PSD designs, optimized, and responsive mobile-first interfaces.
• Handled Level 1/2/3 technical support, managing system refactoring, SEO optimization (sitemaps, metadata), and resolving server infrastructure and provider bottlenecks.
• Infrastructure, IoT & Automation Projects: A collection of specialized projects focusing on low-level networking, custom protocols, server administration, and data scraping.
Key achievements:
• Architected multi-domain mail servers using Postfix, Dovecot, and SpamAssassin, implementing advanced delivery verification standards (rDNS, SPF, DKIM).
• Engineered custom email routing features, including automated Sieve-based server-side sorting, archival servers, backup storage relays, and mail quota troubleshooting.
• Developed a custom TCP-based firmware distribution server for IoT devices utilizing a proprietary configuration protocol to manage rule-based version updates.
• Implemented automated firmware version-pinning and dynamic upgrade paths alongside centralized logging to track device deployment status in real time.
• Built high-performance web scrapers to aggregate public e-commerce data (product attributes, images, pricing), structuring it into production-ready databases.
• Multi-Domain Mail Infrastructure & Security: Deployment and troubleshooting of high-reliability mail servers with advanced delivery verification and custom mail-routing features.
Key achievements:
• Architected and deployed multi-domain mail infrastructure using Postfix, Dovecot, PostfixAdmin, and SpamAssassin.
• Implemented and verified advanced email security and delivery standards, including rDNS, SPF, DKIM, and custom MX record configurations.
• Developed tailored email routing solutions, including automated Sieve-based server-side sorting, archival storage servers, and backup mail relays.
• Handled deep infrastructure troubleshooting, analyzing SMTP codes, mail quotas, and external provider delivery anomalies (e.g., Microsoft and Gmail routing issues).
• IoT Firmware Distribution & Management Server: A custom TCP-based server application built to manage rule-based firmware deployments and version control for remote IoT devices.
Key achievements:
• Engineered a custom TCP server communicating via a proprietary configuration protocol to handle remote IoT device connections.
• Developed a flexible version-control engine supporting device-specific firmware pinning and conditional upgrade paths (e.g., dynamic version dependencies).
• Integrated a centralized logging and telemetry system to track connection history, device statuses, and deployment success rates in real time.
• High-Performance Web Scraping & Data Aggregation: Automated data harvesting systems designed to extract public e-commerce data and structure it into production-ready databases.
Key achievements:
• Built custom web scraping engines to aggregate public product information, including descriptions, images, multi-dimensional attributes, and pricing.
• Designed data-cleansing pipelines to transform unstructured web data into structured formats, seamlessly populating production webshop databases.
• Any many more:

Structured background in circuit design, microcontroller integration, and embedded software systems.