Piotr Narel

B2B ticketing platform for a leading ticketing and live-entertainment company, taken from MVP to a full rollout across 1800+ event organizers.

• Designing database schemas that keep the multitenancy system performant
• Splitting functionality into new microservices to improve system scalability
• Profiling microservices to identify performance bottlenecks
• Conducting code reviews focused on scalability, reliability, design patterns, and test coverage
• Monitoring and log analysis (Grafana), preventing infrastructure downtime

Backend systems for telecom and insurance platforms — business process automation, customer self-service, and claims management.

• Decomposing monoliths into scalable microservices
• Integrating with internal systems and external data sources
• Modeling database schemas with performance in mind
• Maintaining high unit and integration test coverage
• Monitoring (Kibana, Grafana) and troubleshooting production issues

Backend solutions for medical and transportation platforms — medical device integration and large-scale traffic & toll management systems.

• Analyzing and implementing communication protocols for device integration
• Reverse engineering hardware communication from collected data
• Building libraries for data exchange with external systems and devices
• Migrating and modernizing legacy systems to a Spring Boot-based architecture

CRM platform for the energy sector — installation management and financial settlements.

• Designing a notification system based on AWS SQS / SNS
• Decomposing the monolith into microservices, extending and maintaining APIs
• Optimizing application performance and database queries

Platforms for employee benefits management and insurance services.

• Maintaining and troubleshooting microservices-based systems
• Building and maintaining search functionality based on Apache Solr
• Monitoring applications and analyzing logs (Kibana, NewRelic)

Backend and infrastructure systems for network management and emergency services — high availability and secure communication.

• Integrating with F5 Load Balancers and network infrastructure
• Configuring VMware clusters (vSphere / ESXi)
• Building secure communication channels for sensitive data