03/18/2026 updated

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Premium member
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Full-Stack Engineer with Java Spring Boot and Angular expertise

Cracow, Poland
Worldwide
MSc in Computer Science
Cracow, Poland
Worldwide
MSc in Computer Science

Profile attachments

Mateusz_Bielak_CV_03_2026.pdf

About me

Senior Full-Stack Engineer, 15+ years in Java, Spring Boot and Angular. Builds scalable APIs, data models and end-to-end features. Experienced in production troubleshooting, performance tuning and LLM integrations: Claude API, Langfuse, Spring AI and MCP.

Java (Programming Language)JavaScriptApplication Programming Interfaces (APIs)DevOpsCloud TechnologiesBackendFront End Software DevelopmentMicroservices
Java Development
Extensive experience with Java 8-21 for building scalable backend services and enterprise applications

Spring Boot Framework
Advanced proficiency in developing REST APIs and microservices using Spring Boot architecture

Database Management
Expert knowledge in PostgreSQL and Oracle DB for designing schemas, optimizing queries and data modeling

Frontend Development
Skilled in Angular 13-22, TypeScript, JavaScript, HTML and CSS for modern web applications

Cloud Technologies
Experience with AWS, Azure, Docker, Nomad and Consul for cloud deployment and orchestration

Testing Frameworks
Proficient in JUnit 5, Mockito, Karma, Jasmine and Cypress for comprehensive testing strategies

DevOps Practices
Knowledge of CI/CD pipelines using GitHub, GitLab, Jenkins and containerization with Docker

Architecture Design
Experience in distributed systems design, event-driven architecture and microservices patterns

Languages

GermanFluentEnglishFluentPolishNative speaker

Project history

Senior Full-Stack Engineer

SwissRe
Development and maintenance of enterprise Master Data Management platform, designing backend services in Spring Boot, PostgreSQL schemas optimization, Angular frontend development and production troubleshooting

Senior Full-Stack Engineer

Stiwa Group (via Kontron)
Design and development of scalable HMI framework for production processes, implementing innovative frontend/backend features and performance improvements

Senior Full-Stack Engineer

Magna Steyr (via Kontron)
Development and maintenance of car manufacturer production line support applications, implementing new features across frontend, backend and database layers

Lead Java Engineer / Solution Architect

UBS (via EPAM Systems)
Designing and developing new version of Trade Order Management System for UBS Investment Bank, architecting distributed system with 600+ deployable units using Nomad orchestration

Delivery Manager (Project Manager)

UBS (via EPAM Systems)
Creating and developing Trade Order Management System for UBS Investment Bank, managing multimillion regulatory projects, leading teams of 30+ people across 3 locations

Software Engineering Team Leader

UBS (via EPAM Systems)
Creating and developing Trade Order Management System for UBS Investment Bank, leading full-stack software development team and managing mission critical systems

Senior Software Engineer

UBS (via EPAM Systems)
Creating and developing Trade Order Management System for UBS Investment Bank, full ownership of mission critical systems and gathering requirements from stakeholders

Software Engineer

UBS (via EPAM Systems)
Creating and developing Trade Order Management System for UBS Investment Bank, designing and implementing new components and features

Software Developer / Analyst

Sabre Holdings
Creating and developing inventory system for airlines using Java, Spring and related technologies

Java Developer / Consultant

Earlier experience
Projects included development of enterprise and CRM systems using Java, Spring and PostgreSQL

Certificates

AWS Certified Solutions Architect - Associate

Amazon Web Services Training and Certification

2021

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