10/16/2026 updated
100 % available
Senior Full-Stack Developer | Java, Spring Boot, Angular | Enterprise Platforms & System Integration
Pułtusk, Poland
Only remote
BEng Electronics & Computer Science in Medicine, Warsaw University of Technology (2020–2024)About me
Senior Full-Stack Developer with 5+ years of experience building enterprise software, from backend services to the user interface. I joined T-Mobile(Detutsche Telekom subsidiary)'s customer diagnostics platform at its early stage and helped grow it into a central hub connecting 40+ systems.
Java (Programming Language)Python (Programming Language)PostgreSQLAngular 2+PL-SQLSQL DatabasesTypeScriptOracle 10g/11gBackendFastAPIFull Stack DevelopmentFront End Software Development
Core developer of the customer diagnostics platform at T-Mobile Poland (Deutsche Telekom Group) since its early stage. The platform is now a central hub connecting 30+ systems (CRM, network monitoring, signaling, core telecom) and supports customer service for 13M+ subscribers. Delivered automated correlation of network fault data with customer activity and a B2B notification system (SMS/email) for network incidents. I define technical scope for integrations and align API contracts with cross-functional teams.
Java & Spring Boot Backend
Backend services and REST APIs in Java/Spring Boot (Hibernate, Maven, microservices) for production telecom systems. I own features end to end, from business requirements to production.
Angular & React Frontend
Angular and TypeScript features for enterprise users at T-Mobile. At FIVA (TON blockchain protocol) I led a small team and built the trading UI, portfolio views and dashboards in React (TanStack), integrated with a Django backend and smart contracts.
Databases
Oracle (SQL, PL/SQL) and PostgreSQL in enterprise applications.
DevOps & Delivery
Docker, Jenkins CI/CD, Linux, HAProxy, Azure. Production deployments and release cycles in an enterprise environment.
Python
Backend development with FastAPI and Django. 2nd place out of 1,000+ in Terminal Live, a European AI programming competition (Correlation One, sponsored by Citadel).
AI-assisted Development, Senior-reviewed
Daily work with Claude Code and GitHub Copilot in a specification-driven workflow. Every change is reviewed and tested by me before it ships: AI speeds up delivery, while quality and accountability stay with me. Client code and data are handled within the client’s security policies and approved tools only.
Certifications & Languages
Azure Fundamentals (AZ-900), ISTQB Foundation Level. English C1 (Cambridge CAE).
Experience
Professional experience5 - 10 years
Freelancer since2021
Languages
EnglishFluentPolishNative speaker
Project history
Core developer of a customer diagnostics platform since its early stage, growing it into a central hub connecting 30+ systems (CRM, network monitoring, signaling, core telecom systems) supporting customer service for 13M+ subscribers. Built a B2B subscription system delivering proactive SMS and email notifications. Developed automated correlation of network fault data with customer activity. Coordinated integrations with cross-functional teams and managed production deployments and release cycles.
Led a small development team building the protocol's web application from idea to production, working directly with the CEO. Developed trading UI, portfolio views, and dashboards in React (TanStack) and TypeScript, integrated with a Python (Django) backend and smart contracts. Part-time, remote.
Developed backend (Java/Spring Boot) and frontend (Angular) features for an enterprise telecom platform.