Product Engineer building privacy-first tools that people actually want to use.

I build things that solve real problems with clean code and thoughtful UX. Currently shipping privacy-first products used by people across 15+ countries.

12+ years programming experience, specializing in full-stack development, AI/ML engineering, and product architecture.

Privacy-first email client with chat-style UX

• The Problem: Email UX hasn't evolved since the 90s. Users spend 2.5 hours daily drowning in cluttered inboxes.
• The Solution: Chat-style interface with MIME→conversation transformation, sub-50ms performance, zero-knowledge encryption.
• Impact: Growing user base across 15+ countries, 40% faster email triage vs traditional clients.
• Tech: Flutter, Supabase, PostgreSQL, IMAP/OAuth 2.0, end-to-end encryption

AI assistant with shared memory across models

• The Problem: Using AI effectively means switching between models for different tasks, losing context each time.
• The Solution: Unified interface with context preservation, smart model routing, seamless switching.
• Impact: 350% faster AI workflows, 94% context retention across model switches.
• Tech: React, LLM APIs, context management algorithms, real-time state sync

Privacy-first health journaling with AI

• The Problem: Health apps send sensitive data to remote servers. Users want predictions, not privacy violations.
• The Solution: On-device TensorFlow Lite inference, synthetic data training, HIPAA-compliant by design.
• Impact: 99% micro-F1 accuracy, <5ms inference time, 95% week-1 user retention.
• Tech: Flutter, TensorFlow Lite, Bi-LSTM networks, synthetic data generation

Control the chaos, prevent the crashes

• The Concept: You control traffic lights in increasingly complex intersections. Toggle signals, manage flow, prevent accidents.
• The Challenge: Real-time traffic simulation with collision detection, optimized for smooth 60fps gameplay.
• Tech: Flutter, custom physics engine, state management, game logic optimization

Grammar of graphics for Flutter

• The Gap: Flutter lacked a comprehensive, performant data visualization library.
• The Solution: 60fps GPU-accelerated rendering with intuitive grammar of graphics API.
• Adoption: Growing community adoption with positive feedback and contributions.
• Tech: Flutter, CustomPainter, GPU optimization, mathematical transformations

Flutter/Dart    ████████████████████ 95%  (5+ years, production apps)
React/Next.js   ████████████████░░░░ 85%  (Modern web development)
Three.js        ████████████████░░░░ 80%  (3D web experiences)
HTML/CSS        ████████████████████ 95%  (Responsive, accessible)

Node.js         ████████████████████ 90%  (API development, microservices)
Python          ████████████████░░░░ 85%  (ML, data processing, Flask/FastAPI)
PostgreSQL      ████████████████████ 90%  (Database design, optimization)
Supabase        ████████████████████ 95%  (Real-time apps, auth, storage)
Google Cloud    ████████████████░░░░ 80%  (Deployment, scaling, monitoring)

TensorFlow      ████████████████░░░░ 80%  (Model training, optimization)
TF Lite         ████████████████████ 90%  (On-device inference, mobile ML)
LLM Integration ████████████████████ 95%  (API orchestration, context mgmt)
Synthetic Data  ████████████████████ 90%  (Privacy-compliant training data)

System Design  ████████████████████ 90%  (Scalable architectures)
UX Research    ████████████████░░░░ 85%  (User testing, analytics)
Figma          ████████████████░░░░ 80%  (Prototyping, design systems)
Product Mgmt   ████████████████████ 90%  (Roadmaps, user stories, metrics)

🌍 Global Reach

• Products used across 15+ countries
• 95% week-1 retention on health applications
• 350% improvement in AI workflow efficiency

⚡ Performance Achievements

• Sub-50ms email processing (15x faster than Gmail)
• 99% accuracy ML models with <5ms inference
• 60fps data visualizations on mobile devices

👥 Community Leadership

• 400+ member AI club president
• 89% positive feedback on technical workshops
• 370% increase in community engagement

📦 Open Source Contributions

• Published packages with growing adoption
• Active contributor to Flutter ecosystem
• Technical documentation and tutorials

• BSc Computer Science (Data Analytics) – Asia Pacific University & De Montfort University
• 12+ years programming experience (started at age 12)
• President, AI Club – Led 400+ member community across 60+ nationalities

• Technical Workshop Leader – 180 average attendees, 89% positive feedback
• Product Launch Success – 15%+ increase in success rates through data analysis
• International Experience – Based in Budapest, EU work authorization ready

• English (Native) • German (Conversational) • Spanish (Elementary) • French (Beginner)

• WebGL/Three.js Advanced Techniques – Building immersive 3D portfolio experiences
• Edge Computing – Optimizing ML inference for mobile and web
• Privacy Engineering – Advanced encryption and zero-knowledge architectures
• Product Analytics – Data-driven product development methodologies

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Recent Focus Areas:

• 🎯 Privacy-first architecture patterns
• 🧠 AI/ML model optimization for edge devices
• 🎨 Interactive 3D web experiences
• 📱 Cross-platform mobile development

"Good products solve real problems. Great products solve them so well you forget the problem existed."

My Product Engineering Principles:

• Privacy by Design – User data should stay with the user
• Performance Matters – Every millisecond counts in user experience
• Simplicity Wins – Complex problems need simple, elegant solutions
• Ship & Iterate – Perfect is the enemy of shipped

Development Values:

• Write code like the next person reading it is a serial killer who knows where you live
• Test in production (but test everywhere else first)
• Documentation is love letters to your future self
• If it's not accessible, it's not finished

I'm always interested in connecting with fellow builders, especially around:

• Privacy-first product development
• AI/ML applications that actually help people
• Cross-platform mobile development
• Product engineering and user experience

📧 Email: [email protected]
🌐 Portfolio: rudi.engineer (Interactive 3D experience)
💼 LinkedIn: linkedin.com/in/rudi-k
🐦 Twitter: @lofifounder

📱 DoublOne: doubl.one
🧠 CaraML: caraml.app
🚦 Tuesday Rush: tuesdae.games
📊 Cristalyse: pub.dev/packages/cristalyse

✍️ Hashnode: hashnode.com/@lofifounder
📝 Medium: medium.com/@rudi-k
👥 Peerlist: peerlist.io/rudik