Hi! 👋,
I'm Jonatan Kruszewski
I specialize in building scalable, maintainable front-end solutions that work seamlessly—without the tech debt nightmare.
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StackOverflow reputation
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Certifications
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Publications
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Years of Experience
About Me 👋
Hi! I’m Jonatan—a senior front-end developer who loves building things that actually work and don’t break the moment you look away.
My Expertise ⚛️
I specialize in React, Redux, TypeScript, and scalable architectures, making sure everything runs smoothly and stays maintainable.
Experience 🏗️
I've worked on large-scale applications, mentored developers, and helped teams clean up messy codebases. I write clean, efficient code that keeps projects scalable instead of turning into tech debt.
Community & Writing ✍️
I contribute to Stack Overflow, write about development, and stay updated with the latest in tech.
Communication is key 🤝
If you need someone who can get things done, solve real problems, and improve your codebase, let's connect!
Latest Publications
Certifications
Why Hire a Certified Developer?
Anyone can write code, but not everyone writes scalable, maintainable, and high-quality code.
Certifications go beyond badges; they're proof that an external authority has reviewed, tested, and validated both knowledge and skills.
When you hire a certified developer, you're not just trusting what they say — you're trusting what they've proven.
GitHub Copilot
Workflow Optimization
AI
GitHub
Prompt Engineering
Data Utilization
GitHub Administration
System Administration
GHEC
GHES
GitHub Enterprise
GitHub
GitHub Advanced Security
GitHub Advanced Security
GHAS
DevOps
Dependency Management
Secret scanning
GitHub Actions
Continuous Integration
GitHub
DevOps
Continuous Delivery
Release Management
GitHub Foundations
Continuous Integration
DevOps
GitHub
Continuous Delivery
Release Management
MongoDB Certified Associate Data Modeler
Data Governance
JSON
MongoDB
Data Management
Query Languages
Cloud Digital Leader Certification
Artificial Intelligence (AI)
Google Cloud
Cloud Security
Google Cloud Platform (GCP)
IT Digital Transformation
Professional Scrum Product Backlog Management Skills™
Scrum (Software Development)
Scrum
Stakeholders
Backlog Management
Product Management
GitLab Certified Git Associate
GitLab Fundamentals
Git
DevOps
Project Management
Version Control
Professional Scrum Facilitation Skills™
Scrum (Software Development)
Scrum
Facilitation
Consensus Decision-Making
Liberating Structures
Professional Scrum™ with User Experience I (PSU I)
User Experience
UX
PSU
Design
Scrum
MongoDB Associate Developer
MongoDB Tools & Tooling
CRUD
Drivers
MongoDB Document Model
Software Engineering
Microsoft Certified: Azure AI Fundamentals
Azure Machine Learning
Cognitive Services
Azure Bot Services
Microsoft Certified: Azure Data Fundamentals
SQL Server On Azure Virtual Machines
MySQL
Cloud
Azure Database Administrator
Azure SQL Data Warehouse
Microsoft Certified: Azure Fundamentals
Cloud Networking
Azure
Cloud Data
Virtualization
Cloud Security
Professional Scrum™ with Kanban I (PSK I)
Kanban
PSK
Flow
Scrum
Agile
Scaled Professional Scrum™ (SPS)
Scaled Professional Scrum
SPS
Scrum
Scaling
Agile
Professional Agile Leadership™ - Evidence-Based Management™ (PAL-EBM)
Evidence-Based Management
PAL
Agile
Agile Measurement
Goal Setting
Professional Agile Leadership™ I (PAL I)
Leadership
PAL
Agile
Leader
Scrum
Professional Scrum Product Owner™ II (PSPO II)
Senior Product Owner
PSPO
Agile
Product Ownership
Product Owner
Professional Scrum Product Owner™ I (PSPO I)
Product Ownership
PSPO
Agile
Product Owner
Scrum
Professional Scrum Developer™ I (PSD I)
Software Development
PSD
Scrum
Development
Developer
Professional Scrum Master™ II (PSM II)
Senior Scrum Master
PSM
Scrum
Scrum Master
Agile
Professional Scrum Master™ I (PSM I)
Scrum Master
PSM
Agile
Scrum
AWS Certified Cloud Practitioner
Cloud Certification
AWS
AWS Cloud
Amazon Web Services
AWS Certification
[PCAP-31-03] PCAP™ – Certified Associate Python Programmer
Object-oriented Programming
Python
Associate
Algorithmic Thinking
Computer Programming
[PCEP-30-01] PCEP – Certified Entry-Level Python Programmer
Basic Python Programming
Python
Entry-level
Computer Programming
MTA: Introduction to Programming Using Python - Certified 2021
Python Programming
Python
MTA: Introduction to Programming Using HTML and CSS - Certified 2021
HTML5
CSS
HTML
MTA: HTML5 Application Development Fundamentals - Certified 2021
Application Lifecycle Management
JavaScript
HTML5 Technology
User Interface CSS Formatting
HTML5 Build User Interface
MTA: Introduction to Programming Using JavaScript - Certified 2021
JavaScript
Let's Connect
I’m open to new projects and collaborations. If you're looking for a developer or have a relevant opportunity, please feel free to reach out. I’ll get back to you as soon as possible.