FULL-STACK DEVELOPER
Building scalable, autonomous systems that transform complex problems into elegant solutions.
TECHNICAL EXPERTISE
A decade of building robust systems with battle-tested technologies
Enterprise-grade applications, microservices, and complex systems
RESTful APIs, dependency injection, and application architecture
Build automation, dependency management, and CI/CD pipelines
Automation scripts, data analysis, and web scraping
Modern frontend development with TypeScript
Web scraping, automated testing, and browser automation
Deep understanding of complex systems and algorithmic thinking
Pathfinding and graph traversal optimization
Live database syncing and dynamic data visualization
100k+ lines of code in autonomous systems
Self-optimizing orchestration and decision engines
Telemetry pipelines and performance tracking
Data-informed architecture and optimization
SYSTEMS & PROJECTS
Complex systems built with scalability, performance, and maintainability in mind
Built a fully autonomous system running large-scale automated workflows. Features self-optimizing decision engines, comprehensive telemetry, and real-time monitoring across 100k+ lines of code.
Designed and implemented dashboards with live database connections, real-time analytics, and dynamic data visualization. Features pattern recognition and automated alerting systems.
Built custom plugins, hosted and managed server infrastructure, and grew an active community. Implemented monetization strategies and community management systems.
ENGINEER MINDSET
The mindset and approach that drives impactful engineering
Proactively identifying opportunities, taking initiative, and demonstrating ownership. Founder of podcast 'Op Papier', always focused on value creation.
Fast learner who thrives in different workflows and project environments. Hands-on mentality with ability to quickly master new technologies and domains.
Strong analytical capabilities combined with deep understanding of how complex systems interact. Ability to see both the forest and the trees.
Deep reflection and self-improvement mindset. Not afraid to experiment or fail, but focused on learning and iterating towards better solutions.
Natural instinct for automation and efficiency. Constantly seeking ways to streamline workflows and eliminate bottlenecks.
Creating trust between stakeholders and development teams by translating technical complexity into understandable, valuable solutions.
"A good leader is someone who doesn't do everything themselves, but ensures the team can bring out the best in themselves."
— Personal Philosophy
PROFESSIONAL JOURNEY
Building products and systems across multiple industries
Optimized the IAM test process by identifying bottlenecks and implementing improvements, resulting in faster and more reliable testing cycles.
Full-stack role combining business analysis with hands-on development. Translated customer needs into innovative solutions with clear roadmaps.
Led product development while contributing to back-end architecture. Managed backlog, sprint planning, and stakeholder communication.
Led projects with responsibility for backlog, scope management, and stakeholder communication. Implemented Agile methodologies effectively.
Bridged business requirements and technical implementation. Focused on translating complex customer needs into actionable development tasks.
Hogeschool Utrecht
Graduated February 2025
Practice-oriented learning route within HBO-ICT. Specialized in Business & IT. Worked in multidisciplinary teams on real challenges.
Coursera (Google)
Sep 2022 — Feb 2023
Digital marketing fundamentals and strategy.
GET IN TOUCH
Looking for challenging technical projects where I can make a real impact. Open to discuss how I can contribute to your team.
tjonnakoster@hotmail.com
@Tjonna Koster
+31 6 18 52 26 55
Nijkerkerveen, Netherlands