• Contributed as a backend developer for the HR management platform Sloneek, designed to streamline employee and company administration.
• Collaborated closely with the frontend team to define and align backend?frontend integration.
• Participated in the backend architecture design, ensuring scalability and maintainability of the application.
• Implemented core backend features, including business logic, data access layers, and RESTful services.
• Provided consultation on API design, database structure, and performance optimization.

• Led the end-to-end design and implementation of a management system for the Independent Christian Trade Union of Healthcare and Social Services (NOZP).
• Collaborated directly with the client to analyze requirements, define workflows, and create detailed technical and UI specifications.
• Designed the system architecture, including REST API definitions, database schema, and frontend layouts.
• Created wireframes and UX drafts for the frontend and coordinated backend?frontend integration.
• Managed a team of 5 developers, delegated tasks, and ensured consistent code quality.
• Personally implemented backend components, REST services, and automated deployment.
• Oversaw the entire delivery lifecycle, from concept to production deployment and maintenance.

• Actively participated in architectural discussions to design microservices-based solutions supporting complex sales processes.
• Ensured alignment of system design with business requirements and enterprise standards.
• Led the adoption of AWS, Kubernetes, and CI/CD pipelines.
• Mentored junior developers in Java, Spring, and modern engineering practices. 

• Worked as a Senior Backend Engineer on a new internet banking application for children, designed to provide a secure and educational experience.
• Collaborated with the bank?s solution architect on scalable Spring Boot microservices architecture.
• Designed and implemented the REST API layer and database model, integrating with existing core banking systems.
• Built reliable Kafka-based messaging for event-driven communication between services.
• Participated in CI/CD pipeline setup, container orchestration, and deployments on AWS and Kubernetes.

• Collaborated with architects to design and implement scalable backend systems for enterprise web applications.
• Provided technical leadership in developing systems using Java, Spring Boot, Python, and PostgreSQL on AWS.
• Promoted best practices in CI/CD, code quality, and performance optimization.
• Acted as a technical escalation point for complex issues. 

• Working as a Backend Engineer on enterprise solutions supporting public transportation systems for clients across Europe and North America.
• Developing new features and maintaining Spring Boot-based backend services.
• Participating in the migration from WildFly to Quarkus, improving performance and maintainability.
• Implementing persistence layers and migrations using Hibernate and Flyway.
• Contributing to performance optimization and system scalability across microservices.
• Collaborating with architects on solution design and aligning with technical requirements.
• Involved in deployment automation and Kubernetes orchestration. 

• Independently designed, developed, and deployed a complete integration portal using Java Spring Boot and Angular.
• Designed and implemented a PostgreSQL schema with optimization and versioned migrations.
• Configured and maintained Ubuntu server environments, including CI/CD and security setup.
• Developed full backend architecture and REST APIs, integrating with the frontend.
• Managed the full development lifecycle, from analysis to deployment and maintenance. 

• Designed and developed an AI-powered contact center solution integrating real-time voice communication with conversational AI.
• Implemented backend services in Java Spring Boot, responsible for AI workflow orchestration, user session management, and third-party API integration.
• Integrated OpenAI GPT-4o for natural language understanding and response generation.
• Connected Whisper (speech-to-text) and Text-to-Speech (ElevenLabs) services for bidirectional human?AI voice interaction.
• Developed APIs to handle Twilio call routing, voice stream processing, and AI response streaming.
• Designed a modular architecture enabling scalability and extension toward multilingual voice bots.

• Designed and delivered a secure, cloud-ready backend for daily plant logs, maintenance records, feedstock/production tracking, and compliance reporting.
• Modeled core domain entities (facilities, batches, sensors, inspections) with strict audit trails and immutable event history.
• Exposed REST APIs for web/mobile clients; implemented role-based access (admin, operator, auditor) and JWT-based auth.
• Built reporting pipelines (daily/weekly/monthly) with export to PDF/CSV and automated regulator-ready summaries.
• Added integrations for telemetry/imports (CSV/Excel, sensor data endpoints) with validation and anomaly checks.
• Implemented multilingual support (DE/EN; extensible) and timezone-safe scheduling for reminders and inspections.
• Set up CI/CD, containerization, and observability (health checks, structured logs, metrics, alerts)

Designed and delivered a secure, cloud-ready backend for daily plant logs, maintenance records, feedstock and production tracking, and compliance reporting. Modeled core domain entities (facilities, batches, sensors, inspections) with strict audit trails and immutable event history. Exposed REST APIs for web and mobile clients, implemented role-based access (admin, operator, auditor) with JWT authentication. Built reporting pipelines (daily / weekly / monthly) with PDF / CSV export and regulator-ready summaries. Added integrations for telemetry imports (CSV / Excel / sensor endpoints) with validation and anomaly checks. Implemented multilingual support (DE / EN, extensible) and timezone-safe scheduling. Set up CI/CD, containerization, and observability (health checks, structured logs, metrics, alerts).

Technologies: Java, Spring Boot, PostgreSQL, Flyway, JPA, Hibernate, REST, OpenAPI, Docker, Kubernetes, Elasticsearch, MapStruct, Lombok, JUnit 5, Mockito, GitHub Actions

Designed and developed an AI-powered contact center solution integrating real-time voice communication with conversational AI. Implemented backend services in Java Spring Boot responsible for AI workflow orchestration, user session management, and third-party API integration. Integrated OpenAI GPT-4o for natural language understanding and response generation. Connected Whisper (speech-to-text) and ElevenLabs (text-to-speech) for bidirectional human-AI voice interaction. Developed APIs for Twilio call routing, voice stream processing, and AI response streaming. Designed a modular architecture enabling scalability and extension toward multilingual voice bots.

Technologies: Java, Spring Boot, REST APIs, OpenAI GPT-4o, Whisper, ElevenLabs, Twilio, WebSockets, Docker, PostgreSQL, AWS

Collaborated with architects to design and implement scalable backend systems for enterprise web applications. Provided technical leadership in developing systems using Java, Spring Boot, Python, and PostgreSQL on AWS. Promoted best practices in CI/CD, code quality, and performance optimization. Acted as a technical escalation point for complex issues.

Technologies: Java, Spring Boot, PostgreSQL, Python, AWS, Jenkins, SonarQube, Kubernetes, Kafka

Senior Backend Engineer on a new internet banking application for children, designed to provide a secure and educational banking experience. Collaborated with the bank's solution architect on scalable Spring Boot microservices architecture. Designed and implemented the REST API layer and database model, integrating with existing core banking systems. Built reliable Kafka-based messaging for event-driven communication between services. Participated in CI/CD pipeline setup, container orchestration, and deployments on AWS and Kubernetes.

Technologies: Java, Spring Boot, Hibernate, Liquibase, PostgreSQL, Kafka, AWS, Kubernetes, Docker, CI/CD (GitLab / Jenkins), REST APIs

Actively participated in architectural discussions to design microservices-based solutions supporting complex sales processes. Ensured alignment of system design with business requirements and enterprise standards. Led the adoption of AWS, Kubernetes, and CI/CD pipelines. Mentored junior developers in Java, Spring, and modern engineering practices.

Technologies: Java, Quarkus, Spring Boot, JavaScript, Microservices, AWS, PostgreSQL, Oracle, Hibernate, Liquibase, Kafka

• Contributed to the development of an application managing electricity payments and building connections to the power grid.
• Collaborated with the architecture team to design scalable, maintainable backend solutions.
• Delivered a complete backend implementation using Spring Boot, Hibernate, and PostgreSQL.

• Designed and developed an internal web application for creating and managing dynamic forms (similar to Google Forms). 
• Contributed to mobile network management applications, including a 2-month knowledge transition in Bonn, Germany. 
• Led the redesign of an existing mobile network management system into a modern web application.
  • Participated in architecture proposal discussions and design of a scalable backend solution.

• Worked as a software engineer within the factory?s IT department, supporting production processes through custom-developed internal systems.
• Identified inefficiencies in manual data collection and proposed the development of digital tools to automate data tracking and evaluation across production lines.
• Independently designed, developed, and deployed two web-based applications used in daily manufacturing operations:
  • Quality Testing Application: Recorded and evaluated paint process data for improved defect traceability.
  • Production Line Monitoring System: Tracked and analyzed production metrics to enhance process efficiency and reduce paper-based workflows.
• Collaborated closely with production teams to align functionality with real manufacturing requirements and integrate applications into existing workflows.
• Both systems were successfully deployed and adopted on the factory floor, supporting BMW and Kia component production lines.