Description

I'm a Senior Java Engineer with over 8 years of experience designing, building, and maintaining enterprise applications based on Java, Spring Boot, and microservices.

I help companies deliver reliable, scalable software by taking ownership of projects from requirements analysis and solution design through implementation, deployment, and production support.

My experience includes developing distributed systems, event-driven architectures, REST APIs, and backend services used in energy and healthcare industries. I also work with Angular on the frontend when full-stack expertise is needed.

What I can help you with

• Java & Spring Boot development

• Microservices architecture

• REST API design and integration

• Apache Kafka & RabbitMQ

• PostgreSQL & Oracle SQL

• Docker & Kubernetes

• Angular & TypeScript

• Performance optimization and refactoring

• Technical troubleshooting and production support

I enjoy working closely with product owners and stakeholders to turn business requirements into robust technical solutions. My focus is writing clean, maintainable code and delivering software that creates real business value.

I'm available for long-term remote B2B collaborations and I'm comfortable working in international teams.

Industry field of expertise

Languages

Polish
Native or bilingual
English
Fluent
Spanish
Fluent
German
Basic

Workplace preferences

Can work on-site

Wroclaw (up to 50km), Warsaw (up to 50km)

Connectpoint
Software Engineer
ENERGY AND UTILITIES
May 2022 - Today (4 years and 3 months)
Warsaw, Poland
Owned backend services for a platform managing energy production, consumption, and heating. Designed and implemented microservices handling critical business workflows and integrations. Improved system reliability by introducing proactive monitoring and issue detection. Collaborated directly with product owners and stakeholders to translate business requirements into technical solutions. Accelerated setup processes and enabled remote monitoring, saving ~2h/day of field work.
Technologies: Java, Spring, Angular, PostgreSQL, Docker, Kubernetes, Microservices
Microservices Java Angular Apache Kafka SQL
Capgemini
Software Engineer
January 2020 - May 2022 (2 years and 4 months)
Took ownership of a high-risk microservice and led its stabilization and refactoring. Made architectural and technical decisions to improve performance, scalability, and code quality. Worked closely with cross-functional teams to deliver business-critical features. Java, Spring, Microservices, Kafka, RabbitMQ, Oracle SQL
Java Apache Kafka Microservices Angular Agile method
Capgemini
Junior Software Engineer
January 2018 - January 2020 (2 years)
Transitioned from automation testing to backend development. Delivered features for healthcare systems, including real-time monitoring and alerting. Reduced vaccine waste by 20% through temperature monitoring and alert automation.

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Bachelor's in Application of IT in
Wroclaw University of Economics and Business
2020
Bachelor's in Application of IT in
Wroclaw University of Science and Technology
2017

Rafał Cieślar

Senior Java Engineer | Microservices

About Rafał

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