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I build data platforms and BI systems that turn messy data into reliable dashboards and automated analytics. I work daily in production BI environments, specializing in Apache Superset, secure multi-tenant dashboards, and backend data systems. My focus is building analytics platforms that are stable, scalable, and easy for teams to use. What I Do Best — Customize and extend Apache Superset (RLS, Jinja templating, global parameters, alerts) — Develop custom chart plugins and extend the platform with new visualization capabilities — Design and optimize complex SQL queries (PostgreSQL, MSSQL, Firebird) — Build backend logic in Python for data workflows and automation — Deploy systems using Docker and containerized environments — Set up CI/CD pipelines (GitHub Actions, GitLab CI) — Build internal dashboards and data tools for business teams Real-World Experience — Implemented global parameter systems inside BI environments — Built SQL Lab extensions to execute stored procedures and generate datasets — Worked with multi-database synchronization and metadata systems — Managed production deployments and infrastructure debugging — Automated workflows using Python and Bash If you need someone who understands both backend engineering and the data layer, I can help design and implement a clean, reliable solution from the start. I focus on clean architecture, long-term maintainability, and real business impact.

I specialize in crafting efficient and innovative software solutions that cater to a variety of needs. Here's what I excel at: 1. Full-Stack Development: Expertise in both front-end and back-end development, ensuring seamless integration and a holistic approach to building applications. Proficiency in HTML, CSS, JavaScript, and modern front-end libraries/frameworks such as React and Vue.js. Skilled in server-side languages like Node.js and Python, with experience in building API. 2. Cloud Solutions: Experience in deploying applications on cloud platforms like AWS, Azure, or Google Cloud, utilizing their services to enhance scalability, reliability, and security. 3. UI/UX Design: A keen eye for user-centric design, focusing on creating intuitive and visually appealing interfaces that enhance the user experience. Proficient in using design tools like Adobe XD or Figma to create wireframes and prototypes. 4. Problem Solving: Strong analytical skills to dissect complex challenges and devise effective solutions, leveraging data structures and algorithms. Adept at troubleshooting and debugging to ensure smooth functionality and optimal performance of applications. 5. Collaborative Approach: Excellent communication skills and a collaborative mindset that fosters teamwork and ensures seamless coordination with fellow developers, designers, and stakeholders. Proactive in seeking feedback and iterating on solutions to achieve the best possible outcome. Whether you're looking to build a dynamic web application, a feature-rich mobile app, or enhance your digital presence through cloud solutions, I'm here to turn your vision into a reality. My commitment to quality, innovation, and timely delivery ensures that your project is in safe hands. Let's team up and create something exceptional together!

I’m a Fractional CTO and Senior Software Architect with 15+ years of experience building production-grade Node.js and TypeScript systems—especially B2B SaaS platforms where correctness, integrations, and long-term maintainability truly matter. As the founder of Clever Goat, I currently deliver full-stack engineering across SaaS, CRM, and mobile applications. Before that, I architected and built a digital tax compliance platform (Connectax) at my other company, Vilkrig, which has been running in production for over 4 years—integrating with Hungary’s national tax authority (NAV) as well as the two largest Hungarian invoicing APIs (Billingo and Számlázz.hu). It’s the kind of system where a single bug can trigger audit letters, so I’m comfortable operating in domains where edge cases and data correctness carry real financial and legal consequences. ━━━━━━━━━━━━━━━━━━━━━ WHAT I DELIVER ━━━━━━━━━━━━━━━━━━━━━ ▸ Backend & API architecture (Node.js / NestJS / TypeScript / PostgreSQL) • Clean, testable REST APIs and service layers • Multi-tenant SaaS with tenant-safe filtering, RBAC, and row-level security • Background jobs, webhooks, retries, and observability • Third-party integrations: Stripe, OAuth, tax/invoicing APIs, ERP systems ▸ Legacy modernization & TypeScript migration If you have a legacy JavaScript codebase and need to modernize — gradual TS migration, dependency upgrades, CI/CD tightening, test coverage — I've done this on production systems without breaking anything. You get a migration plan, measurable weekly progress, and a maintainable codebase at the end. ▸ Architecture review & Fractional CTO consulting Fixed-scope codebase audits with a written report: what's working, what's risky, what to prioritize. Ideal if you're preparing for scale, a funding round, or a handover. I can also stay on as a fractional CTO / technical advisor for early-stage teams — 2-5 hours per week is usually enough to keep your technical direction sharp. ━━━━━━━━━━━━━━━━━━━━━ SELECTED WORK ━━━━━━━━━━━━━━━━━━━━━ * Digital tax compliance platform — Architected and built at my previous company. In production for 4+ years, with real-time integrations to Hungary’s national tax authority (NAV) and two major invoicing APIs. Multi-tenant Node.js + PostgreSQL backend processing ~X invoices/day across Y business tenants. * Clever Goat — Founder and lead engineer. Delivering custom B2B SaaS, CRM systems, and mobile applications. * LINDABI — CRM platform for construction companies, with tailored workflows for project and client management. * LINDABI Tracking — Cross-platform mobile app for workforce time tracking, specifically designed for construction site operations. * Upwork projects — Built a Node.js-based rule engine with Dockerized deployment, refactored a large React codebase, and led a full JavaScript → TypeScript migration. ━━━━━━━━━━━━━━━━━━━━━ HOW I WORK ━━━━━━━━━━━━━━━━━━━━━ - Quick discovery call → written scope with fixed milestones - Weekly demos, measurable progress, no surprises - Proper handover: documentation, deployment notes, maintainable code ━━━━━━━━━━━━━━━━━━━━━ A GOOD FIT IF... ━━━━━━━━━━━━━━━━━━━━━ You're past MVP and need a senior architect to ship real B2B SaaS — especially systems where integrations, authorization, or domain complexity make a junior-heavy team risky. If you're looking for the cheapest developer, I'm not that — but if you want something built right the first time, let's talk.

AWS-certified Data Platform Engineer with 8+ years delivering production ML and data pipelines. At MindGym I optimized ETL Argo jobs, cut AWS costs via autoscaling/Terraform, built serverless Lambda pipelines and Snowflake-backed Streamlit dashboards. Previously at LoopMe I ran XGBoost/H2O models on GKE with PySpark and Kubernetes. I help teams simplify cloud infrastructure, reduce costs and ship reliable data products fast. Available immediately for fixed-price or hourly work.

Experienced Software Engineer with a demonstrated history of working in the information technology and services industry. Skilled in Linux, Bash, Python, Ansible, Terraform, Docker, Kubernetes, monitoring and logging solutions . Strong engineering professional with a Master’s Degree focused in Biomedical/Medical Engineering from Budapest University of Technology and Economics.

✅ I have crafted backend systems for four Fortune 500 companies in the banking, e-commerce, and AI industries, each generating over $4 million in revenue in their first year. Furthermore, I spearheaded the development of internal CRM systems for three companies, resulting in a remarkable 54% decrease in operational costs. If you're looking for an experienced developer who delivers robust solutions and boosts revenue, feel free to reach out. I'm a top-rated professional on Upwork. ⭕ Reach out to me for high-quality projects based on Java and Python. ⚙️ Possessing a robust understanding of Agile Software Development processes (Scrum, Waterfall, Hybrid, Agile) and expertise in Code Review processes across projects of varying scales. 🤝 A collaborative team player with the ability to effectively engage with architects, engineers, and product management to deliver user-friendly and visually appealing results. ▪️ Take pleasure in producing clean, well-written, and highly efficient code in my projects. I firmly believe that good communication is the key to creating successful products. Key technologies: ✅ Microservices development ✅ Python ✅ Java 13 ✅ Kotlin ✅ Spring boot, Spring cloud ✅ Kubernetes ✅ PostgreSql ✅ Angular ✅ Redis ✅ ElasticSearch ✅ RabbitMQ ✅ Spring Security ✅ Keycloak ✅ Maven ✅ WebSocket ✅ MongoDB ✅ Docker ✅ Jenkins ✅ GraphQL ✅ TestContainers and Cucumber ✅ CI/CD: GitLab CI ✅ Open AI API Key Qualifications: ⭐ Expert understanding of Java and Python technologies ⭐ Understand needs of company of any scale ⭐ Development of software, mobile apps, web apps ⭐ High-performance, maintainable and reusable code ⭐ 7+ years of experience ⭐ Self-starter, hard worker, organized, attentive to details and a team player ⭐ Good communication skills