AI application studio
From concept to production. Machine learning, natural language processing, and intelligent systems that solve real problems.
CitronLab is a technology studio founded by Leo Gestetner and Nick Brandt, with over 30 years of combined experience building scalable solutions. A Thankz, LLC company — available globally.
We specialize in AI/ML applications, from large language models and RAG systems to temporal memory architectures and on-device inference. Our approach is production-first — we build systems that work at scale, not just demos.
Leo Gestetner
CEO & Co-founder
Entrepreneur and athlete with decades of experience leading global remote teams. Leo believes the best work comes from a balanced foundation of family, health, and meaningful work.
Nick Brandt
CTO & Co-founder
Technology leader specializing in AI, machine learning, and systems that understand context. Built everything from RAG systems to temporal memory architectures.
From enterprise networking to personal memory architectures.
From early web to AI-native systems at scale.
Applied AI research across LLMs, memory systems, and serverless architectures.
Custom LLM integration, prompt engineering, fine-tuning pipelines, and RAG-augmented inference for your domain.
Retrieval-augmented generation for domain-specific knowledge bases. Vector search, semantic chunking, and hybrid retrieval.
AI systems that understand time, context, and relevance decay. Memory architectures that surface what matters now.
Private, fast inference without cloud dependency. MLX and Core ML implementations that run entirely on-device.
AWS serverless architectures that scale to zero and back. Lambda, DynamoDB, API Gateway — optimised for cost and latency.
Python, Rust, TypeScript, React, React Native, Swift. From backend inference APIs to polished mobile and web experiences.
Applied AI research from the work — architectural patterns, design decisions, and lessons from building production systems.
Learning on the fly, the fast way. A pattern for building consensus across multiple model calls before committing to storage.
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Why AI systems need to forget. Time-aware relevance scoring and decay functions for knowledge systems.
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Show results before AI finishes. A streaming architecture that delivers retrieval results instantly, then enriches with LLM output.
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Rust for real-time serverless. Eliminating cold-start latency in AWS Lambda with compiled binaries and connection pooling.
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The end of cloud AI dependency. Running capable language models on Apple Silicon with MLX — private, instant, offline.
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Surfacing what you need before you ask. Push-model architectures that anticipate intent from context and behavioral signals.
Read paperEnterprise Heritage
Fortune 500 clients across 3 continents
Enterprise AI networking platform that helped organizations connect their people. Built intelligent systems that understood who should know each other — and why. Served Fortune 500 clients across events, hospitality, and corporate sectors.
Python · React · PostgreSQL · AWS · Machine Learning
AI coaching for thousands of users on iOS + Android
AI health coaching platform. An AI assistant named Kai helps users build sustainable health habits through natural conversation — tracking nutrition, sleep, exercise, hydration, and mindfulness in one place.
React Native · Node.js · AWS · Conversational AI
10,000+ documents per batch, automated forensic analysis
Internal corporate document verification platform. Automates fraud detection across invoices, contracts, and expense reports using AI-driven analysis. Processes batches of 10,000+ documents with multi-tier forensic analysis.
Python · Rust · React · AWS CDK · Amazon Bedrock · PostgreSQL
Have a project in mind? Looking to add AI capabilities to an existing product? We'd love to hear about it.
Email us at team@citronlab.com or use the form.