Nina Hajok
AI Architect & Senior Machine Learning Engineer
Designing scalable AI systems and production-grade ML solutions. I translate complex business needs into robust, explainable, and efficient technical solutions that drive real impact.
Building intelligent systems that matter
I'm a strategic and hands-on AI professional with a proven track record of designing scalable data architectures, building production-grade ML systems, and driving AI adoption across organizations.
From AI enablement in public sector environments to overhauling enterprise data platforms and building real-time recommendation systems, I bring deep expertise in predictive modeling, data pipelines, and cloud-native infrastructure.
Based in Germany, I work remotely with clients across the EU, helping them leverage AI to solve complex challenges and unlock new opportunities.
Solutions
Pipelines
Architecture
Native
& LLMs
Systems
Eng.
How I can help you
AI Architecture & Strategy
Design sustainable AI infrastructure from the ground up. I help organizations build their AI capabilities with a focus on data validation, automation, and scalability. From proof-of-concept to full implementation.
ML System Development
Build production-ready machine learning systems that deliver real business value. Recommendation engines, predictive models, LLM integration, and more - all designed for reliability and performance.
Data Engineering
Design and implement scalable data pipelines and architectures that support real-time analytics and decision-making. Feature stores, ETL processes, and Big Data solutions using modern cloud technologies.
Technical Leadership
Elevate your team's capabilities through code quality coaching, Clean Code workshops, and best practices training. I help establish engineering guidelines and mentor teams to build maintainable, high-quality software.
Career journey
Technical Lead AI & AI Architect
Leading creation of AI divisions in regulated environments. Designing sustainable infrastructure focused on data validation, automation, and scalability. Complete architecture overhauls from system audits to production-ready implementations.
Senior ML / AI & Data Engineer
Developing AI-based recommendation systems, directing LLM-driven algorithms for video processing, building predictive engines using Big Data technologies, and architecting comprehensive Feature Stores.
Senior Machine Learning Engineer
Led development of secure, scalable data storage solutions. Pioneered data augmentation strategies and authored compliance tests against US regulations for bias and discrimination in predictive hiring models.
Data Engineer, AI Product Engineering
Championed PySpark adoption reducing KPI computation from 24 hours to 18 minutes. Technical lead for pallet-loading optimization resulting in multi-million euro savings. Organized internal developer conference with 42 presentations and 79 speakers.
M.Sc. Computer Science
Master's thesis on real-time data acquisition and analysis architecture for medical devices using cloud services (GPA: 4.0). Bachelor's thesis on language learning game development (GPA: 4.0).
Featured work
Public Sector AI Division
Led the creation of a new AI division within a highly regulated government environment. Designed infrastructure for plausibility checking, covering architecture to implementation.
Gaming Platform Architecture
Complete overhaul of data and AI architecture for a game development company. From system audit to AI-ready platform enabling personalized gaming experiences.
Predictive Recommendation Engine
Built a recommendation engine for a major entertainment company using Big Data technologies. Enhanced user engagement and retention through personalized content.
Pallet-Loading Optimization
Technical lead for optimization solution at SCHWARZ IT that resulted in multi-million euro savings by enhancing operational efficiency and reducing truck loading times.
Geospatial Solar Analysis
Developed analytics model to calculate rooftop sizes suitable for solar energy installations. Enabled renewable energy clients to optimize site selection at scale.
AI Compliance Framework
Authored compliance tests against US regulations for bias and discrimination in predictive hiring models, ensuring ethical AI deployment.
Technologies & expertise
Languages & Processing
Machine Learning & AI
GenAI & LLMs
Cloud Platforms
Infrastructure & DevOps
Core ML Competencies
Let's work together
Have a project in mind? I'd love to hear about it. Let's discuss how I can help you achieve your AI and data goals.