My Areas of Expertise
CUSTOM BACKEND DEVELOPMENT
(Java, Spring Boot, Kotlin)
I design and develop robust and scalable backend systems. From REST APIs and microservices to complex enterprise applications that handle high loads.
Key areas:
- Development in Java, Spring Boot & Kotlin
- REST API design and implementation
- Database optimization (PostgreSQL, MySQL)
- Third-party tool integration (e.g., AI, payment gateways)
Individual Quote
ENTERPRISE FRONTEND DEVELOPMENT
(Angular, TypeScript)
I build complex and interactive user interfaces for internal systems, B2B portals, and analytical dashboards. I focus on clean code and performance.
Key areas:
- Development in Angular & TypeScript
- Responsive dashboard creation
- Connecting to backend APIs
- State management and application optimization
Individual Quote
FULL-STACK & OPTIMIZATION
(Technical Leadership & Consulting)
I take responsibility for delivering a project from A to Z, or I can analyze your existing application and dramatically improve its performance.
Key areas:
- Full-stack development leadership (Java + Angular)
- Performance audit & optimization (e.g., 92% speed-up)
- Mentoring junior developers
- Deployment & DevOps (Docker, CI/CD)
Individual Quote
Have a specific requirement?
Take advantage of a free 30-minute consultation, and we'll find the perfect solution for you.
Schedule a ConsultationForms of Long-Term Collaboration
I am flexible and offer several collaboration models to find the one that best suits your goals, budget, and timeline.
LONG-TERM COLLABORATION (CONTRACT)
The ideal model for companies needing to strengthen their team long-term (part-time or full-time). I become a fully integrated part of your project on a B2B basis.
Individual (Monthly Retainer)
CONSULTING & CODE AUDIT
Need an independent perspective on your project's architecture, performance, or security? I offer one-time or regular consultations and code audits.
Individual (Hourly Rate)
PROJECT-BASED DEVELOPMENT (TURNKEY)
Have a clearly defined project (e.g., a new internal tool, a B2B portal) that needs to be delivered from design to deployment? I will take full responsibility for it.
Individual Price
How Our Collaboration Works
From the first contact to the final deployment, I have a proven process that ensures transparency, efficiency, and a result you'll be happy with.
1. Initial Consultation (Free)
In a 30-minute call, we'll discuss your goals, ideas, and requirements. The aim is to understand your vision.
2. Solution Proposal & Price Quote
I will prepare a detailed solution proposal and a transparent price quote. You'll know exactly what you're getting for your money.
3. Development & Regular Feedback
During development, I'll keep you informed about the progress and give you access to a testing version.
4. Testing & Deployment
Before launch, we conduct thorough testing. After your approval, I'll deploy the solution to the production server.
5. Handover & Support
I'll hand over all credentials, provide training, and I'm here for you in the future for any support you may need.
My Experience and Portfolio
My work is primarily focused on complex B2B and internal systems protected by NDA. Below, you will find detailed case studies describing the problems, solutions, and benefits of my work for clients.
Case Studies (NDA Projects)
Platform for a B2B Analytics Company (London)
Problem: A
fast-growing analytics startup needed to build a central B2B
platform from scratch to manage projects, clients, and
securely sell digital products (reports, dashboards).
Solution: As the lead
developer, I designed and implemented a full-stack
application (Java/Spring Boot + Angular). I implemented
advanced features like GPT integration for data processing,
JWT security, and advanced user management with roles. At
the same time, I mentored a junior developer.
Key Benefit: The
rapid development in a small team secured the client's trust
with investors, leading to repeated budget increases. The
platform is ready for a planned multi-million euro growth.
Technologies: Java, Spring Boot, Angular, JWT, GPT-4 API, PostgreSQL
Performance Optimization for a Key Application
Scenario: A key
internal application (TeamHub), used by dozens of employees,
suffered from slow Excel report generation, which reduced
productivity.
Key Achievement:
After an in-depth analysis and refactoring, I achieved a
reduction in report generation time from 1 minute to 5
seconds, representing a 92% performance increase.
Technologies: Java, Spring, Database Optimization
Invoice Management System (Full-Stack Development)
Scenario: The company
needed to automate and clarify internal financial processes
that were burdened by manual and error-prone work.
Solution: I led the
complete development of an internal invoicing system from A
to Z. The application successfully streamlined financial
workflows throughout the company.
Technologies: Angular, Spring Boot, Java
Who's behind the code?
My journey into programming fully began during my informatics studies at the Technical University of Košice. It was there I discovered my passion for creating digital solutions and the joy I get from seeing the results of my work.
The desire for real-world experience was so strong that, on my own initiative, I worked for two IT companies alongside my demanding studies, often on a full-time basis. This experience gave me an invaluable foundation on which I build today.
After successfully graduating, I embarked on a freelance career. My greatest motivation is client satisfaction—every piece of positive feedback confirms that my work has a real impact and purpose.
My Technology Stack
Backend
Frontend
Tools & DevOps
Words from industry experts
"Juraj is characterized not only by his technical skills but also by his willingness to learn and grow. His focus on writing clean and maintainable code is commendable and significantly contributes to the team's overall productivity."
Karol Sládeček
Owner Orátu, s.r.o. | Software Architect
"I had the pleasure of working with Juraj, who consistently demonstrated excellent programming skills and an eye for clean code. He focused on understanding the entire codebase, not just individual tasks."
Matej Delinčák
Medior Java Developer at CODERAMA s.r.o.
Have a Project or an Idea?
Feel free to contact me. I'd be happy to listen to your goals and propose a solution that will bring you real results.
Or simply leave me a message using the form below.