My Projects

Below is a selection of projects and technologies I have worked with. Due to non-disclosure agreements (NDA), some details have been generalized. Additionally, some projects are classified under industrial secrecy, and I am contractually prohibited from mentioning their existence; therefore, they are not referenced here at all.

International Business Application Project

International software development project for a foreign client, focusing on business process modernization and legacy system migration. Collaboration between distributed teams across two countries, fully conducted in English.

Role: Backend developer, interim business analyst, interim international team coordinator.

Key Contributions:

Coordinated migration of legacy systems, reducing delivery times by approximately 40%.
Completed important functionalities stalled for over five years within six months.
Reduced development bottlenecks by around 50% through proactive documentation and process optimization.
Provided interim business analysis and project coordination during resource gaps.
Led distributed team meetings, backlog refinement, and client-facing communication.
Configured and streamlined JIRA workflows for better delivery efficiency.
Independently clarified ambiguous requirements through direct discussions with stakeholders.
Conducted regular code reviews.

Java Spring MSSQL RabbitMQ Docker Jenkins Python JavaScript Redis

Role: Backend developer, interim business analyst, interim international team coordinator.

Key Contributions:

Coordinated migration of legacy systems, reducing delivery times by approximately 40%.
Completed important functionalities stalled for over five years within six months.
Reduced development bottlenecks by around 50% through proactive documentation and process optimization.
Provided interim business analysis and project coordination during resource gaps.
Led distributed team meetings, backlog refinement, and client-facing communication.
Configured and streamlined JIRA workflows for better delivery efficiency.
Independently clarified ambiguous requirements through direct discussions with stakeholders.
Conducted regular code reviews.

High-Volume Sales Platform

Development of a high-performance central sales platform used by major retail networks. Designed for intensive request handling, low latency, and strict SLA compliance.

Role: Lead backend developer responsible for system performance, stability, and observability.

Key Contributions:

Built a system capable of processing multiple requests per second with complex business logic.
Ensured system stability and rapid response times under heavy load conditions.
Established observability standards using Prometheus, Grafana, and ELK Stack (Elasticsearch, Logstash, Kibana).
Adopted and implemented design patterns for modularity and scalability.
Maintained system reliability to meet high availability and strict SLA requirements.
Conducted regular code reviews.

Java Spring PostgreSQL RabbitMQ Redis Docker Jenkins

Role: Lead backend developer responsible for system performance, stability, and observability.

Key Contributions:

Built a system capable of processing multiple requests per second with complex business logic.
Ensured system stability and rapid response times under heavy load conditions.
Established observability standards using Prometheus, Grafana, and ELK Stack (Elasticsearch, Logstash, Kibana).
Adopted and implemented design patterns for modularity and scalability.
Maintained system reliability to meet high availability and strict SLA requirements.
Conducted regular code reviews.

Industrial Monitoring

Monitoring system for tens of thousands of industrial sensors across multiple organizations.

Role: Sole backend developer with occasional frontend support.

Key Contributions:

Performance optimizations for high data volume.
Collaboration with DevOps on infrastructure monitoring.
Development of service-based system architecture.
Supporting incident detection and recovery processes.
Reducing unnecessary database queries and data fetching.

Java Spring PostgreSQL RabbitMQ Redis Docker Jenkins Angular TypeScript

Role: Sole backend developer with occasional frontend support.

Key Contributions:

Performance optimizations for high data volume.
Collaboration with DevOps on infrastructure monitoring.
Development of service-based system architecture.
Supporting incident detection and recovery processes.
Reducing unnecessary database queries and data fetching.

Observability & Real-Time Monitoring R&D

Research and development project focused on building a real-time server monitoring system with dynamic configuration, aiming to make complex technical metrics accessible to non-technical users.

Role: Project lead and backend architect responsible for real-time data processing and optimization.

Key Contributions:

Designed and led the development of a real-time server monitoring system.
Collected live server metrics using Prometheus integration.
Implemented dynamic, JSON-driven data processing ('calculator' system) for flexible monitoring setups.
Optimized data storage with TimescaleDB through indexing and partitioning strategies.
Developed backend services for data ingestion, processing, and API exposure.
Ensured system scalability and maintainability through design patterns.

Java Spring TimescaleDB RabbitMQ Redis Docker Jenkins

Role: Project lead and backend architect responsible for real-time data processing and optimization.

Key Contributions:

Designed and led the development of a real-time server monitoring system.
Collected live server metrics using Prometheus integration.
Implemented dynamic, JSON-driven data processing ('calculator' system) for flexible monitoring setups.
Optimized data storage with TimescaleDB through indexing and partitioning strategies.
Developed backend services for data ingestion, processing, and API exposure.
Ensured system scalability and maintainability through design patterns.

Technical Support for Ecological Initiatives

Pro bono technical project combining web development and physical device integration for an ecological foundation. Focused on enhancing system security, reliability, and custom data acquisition.

Role: Full-stack developer and system integrator for software-hardware solutions.

Key Contributions:

Secured and optimized a WordPress-based website, implementing backup automation and feature extensions.
Conducted reverse engineering of a proprietary serial communication protocol to interface with custom monitoring hardware.
Developed a Java-based application to collect and process raw hardware data, accounting for physical signal imperfections.
Provided full-stack support across backend, web systems, and hardware integration layers.

Java JavaFX MySQL WordPress

Role: Full-stack developer and system integrator for software-hardware solutions.

Key Contributions:

Secured and optimized a WordPress-based website, implementing backup automation and feature extensions.
Conducted reverse engineering of a proprietary serial communication protocol to interface with custom monitoring hardware.
Developed a Java-based application to collect and process raw hardware data, accounting for physical signal imperfections.
Provided full-stack support across backend, web systems, and hardware integration layers.