Project
OAuth Server & Two-Factor Authentication
Rewrote Solcon's OAuth server to align with modern specifications, added multi-provider two-factor authentication, implemented a new design, and upgraded the framework.
Freelance Fullstack Developer
Daan
Biesterbos
I am a passionate Developer with a drive for innovation. I build scalable, high-performance software and love solving complex technical challenges. I call myself a Full Stack Developer today. Not because I do a bit of both, but because I've dedicated years mastering each side independently.
ExpertiseFullstack Development
I specialize in building robust, scalable systems and optimizing high-traffic applications. I started my career when 'web developer' usually meant doing a bit of everything. However, I chose to specialize deeply rather than staying a generalist. I spent nine years focused exclusively on backend architecture—mastering PHP (Symfony) and working with Java, Python, and Node.js. Past four to five years, I shifted that focus towards modern frontend development, building applications with React, Next.js, and TypeScript. I call myself a Full Stack Developer today. Not because I dabble in both, but because I've dedicated years to mastering each side independently.
High Traffic & Scalability. I build high-performance applications capable of handling over 1.5M requests per day. To ensure stability under load, I implement robust strategies involving load balancing, multi-layer caching, and asynchronous message queues.
Cloud Architecture. I design and deploy scalable, cloud-native architectures on Google Cloud. My expertise spans both serverless and containerized environments, leveraging Cloud Run, Cloud Functions, and Pub/Sub to create resilient, event-driven systems.
Ops & Server Management. I rely on Docker professionally to build consistent development environments and production-ready images. Additionally, years of hosting my own projects have given me the practical know-how to manage servers directly—configuring Nginx, Supervisor, and reverse proxies, while tuning MySQL, Redis, and Solr for performance.
Databases & Search. I select the optimal engine for the data structure—whether relational, document, or graph. Beyond standard usage of tools like MySQL, Postgres, Solr, and Elasticsearch, I engineer custom solutions for scale. For Neo4j specifically, I have written custom Java server plugins and built high-throughput ingestion pipelines using Python batch loaders and Golang Dataflow workers to stream real-time data from Pub/Sub.
Tech Stack
Technologies I know and love.
Languages & Backend
PHP
Symfony
Python
Java
TypeScript
NodeJS
GraphQL
Frontend & UI
React
Next.js
Tailwind
Databases & Search
Postgres
Redis
Neo4J
Elastic
Solr
Cloud & Infrastructure
Google Cloud
FirebaseDocker
AI & Machine Learning
OpenAI
AI Studio
Faiss
Experience that matters
I have worked on high-traffic applications, complex backend refactoring, and innovative search solutions.
Project
Resume Processing Pipeline
Building a Google Cloud Dataflow pipeline that can process a virtually unlimited volume of resumes — from streaming ingestion through PubSub, to batched CSV output, to graph import into Neo4j.
Project
Scalable Product Feed Infrastructure
Building asynchronous product import infrastructure at scale, implementing Bol.com's new Marketing API for affiliate partners, and adding full-text product search for locally stored feeds.