Developer and AI/ML Enthusiast
hello@marcinzygmunt.pl
Poland
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Hire Me!Introduce
I'm Martin, Java Software Engineer, AI/ML Enthusiast & Cybersecurity Specialist
I design fast and efficient
applications mostly with Java powered by AI — and I keep them secure.
Just simple like that!
7+
Years of
Java experience
2+
Years of
AI / ML
20+
Years of commercial and government
system integrations
About
Every solid system
starts with a strong foundation
Since beginning my journey as a backend developer, I've had the chance to build enterprise platforms and government applications — always with a focus on scalability, performance, and clean architecture. Over the years, I've worked with Agile teams, tackled ERP systems, automated DevOps workflows, and brought CI/CD pipelines to life. Lately, I've been diving into AI and Machine Learning, blending traditional software craftsmanship with cutting-edge tech. I'm also an active member of CyberLegion — a Polish military cybersecurity programme connecting civilian IT experts with national defence — where I compete in advanced Attack-Defence CTF exercises. I'm quietly confident, endlessly curious, and constantly refining my skills — one line of code at a time.
Resume
Education & Experience
Senior Java Software Engineer
XTB S.A.
- Designing and developing scalable, high-performance trading platforms
- Contributing to the development of distributed notification systems supporting global financial operations
- Leading performance tuning and optimization initiatives to ensure low-latency execution
- Security Champion — acting as the security advocate within the engineering team, promoting secure coding practices, conducting code reviews with a security focus, and coordinating vulnerability remediation
CyberLegion Member
Wojska Obrony Cyberprzestrzeni — Polish Armed Forces
- Active member of CyberLegion — a Polish military programme uniting civilian cybersecurity specialists with national defence
- Participant in Operation Cyber Flag '26 — advanced Attack-Defence CTF exercises, competing among 30+ teams in offensive and defensive cybersecurity tasks
- 1st place — Operation Cyber Flag '26 (2026)
- Focus areas: vulnerability analysis, exploit development, infrastructure defence, incident response
Java Software Engineer
Centralny Ośrodek Informatyki (GOV.PL)
- Building scalable and high-performance public sector systems
- Implementing modern software architectures and patterns
- Performance tuning and system optimization
- Developing global notification system for GOV.PL platform
Chief Information Officer (CIO)
VITBERG
- IT strategy leadership and ERP system management
Java Developer / System Developer
PGO S.A.
- Designing ERP solutions for the manufacturing sector
- Integrations with EPR, BPM, and CRM systems
- Managing enterprise applications across Microsoft Server & Linux
ERP & IT Systems Administrator
PGO S.A.
ERP & IT Systems Administrator
TLC Sp. z o.o.
Fullstack Developer
GREENBOX.PL
- Web and e-commerce app development (PHP, Angular, Java)
- ERP and CRM systems integration
IT Administrator
VISION-POLSKA Sp. z o.o.
IT & Security Specialist / Payment Coordinator
ARiMR — Agency for Restructuring and Modernisation of Agriculture
Services
My Specializations
Backend Development
Designing and building scalable enterprise & government systems using Java, Spring Boot, and microservices.
25+ ProjectsAI & Machine Learning
Expanding skills in intelligent systems development with hands-on experience in ML, LLM integration, and MCP servers.
5 ProjectsCybersecurity
Applying offensive and defensive security skills gained through CyberLegion and CTF competition — vulnerability analysis, secure architecture design, and OWASP-aligned code review.
CTF Winner '26Management & Leadership
Experience as CIO in driving IT strategy, leading teams, and managing digital transformation in enterprise environments.
8+ Teams LedERP Systems
Development and integration of ERP, CRM, and BPM systems for manufacturing and public sectors.
10+ Projectsmy skills
My Advantages
100%
Java
95%
Backend
70%
AI & ML
85%
DevOps & CI/CD
75%
Test Automation
90%
Databases
80%
Cybersecurity
100%
Teamwork
Cybersecurity toolset
OWASP CTF / Attack-Defence Vulnerability Analysis Network Security Secure Architecture Exploit Development Incident Response Penetration TestingAchievements
Notable Wins & Milestones
1st Place — Operation Cyber Flag '26
Won the most demanding stage of the CyberLegion programme — an Attack-Defence CTF where teams simultaneously conduct offensive operations and defend their own infrastructure against 30+ competing teams.
CyberLegion Member
Selected as a civilian cybersecurity specialist for CyberLegion — a programme bridging Poland's top IT professionals with national cyber defence, launched by the Wojska Obrony Cyberprzestrzeni.
Anthropic Certifications
Completed official Anthropic certifications covering Claude API, prompt engineering, and responsible AI development — among the early certified practitioners in Poland.
GOV.PL Notification Platform
Core engineer on the national notification system for GOV.PL — a critical infrastructure platform serving millions of Polish citizens across public sector services.
Contact
Let's Work Together!
Looking for a Java expert or AI enthusiast for your next project? Get in touch via one of the platforms below: