Senior Java Software Engineer

• Job Title : Java Backend Developer
• Job Location : Krakow Poland
• Job Type : B2B contract

Note : This role included coding test

Technical skills and Experience:

• Proficient in Java 17 or other JVM languages.
• At least 4 years of software development
• Advanced Java concepts, including multithreading, collections, JDBC, and design patterns.
• In-depth understanding and hands-on experience with the Spring ecosystem.
• Knowledge of AWS services, particularly S3, SQS, and SNS—including their integration, configuration, and management.
• At least 1-2 years of Kubernetes experience and AWS experience with deep understanding of Docker, Kubernetes, Minikube and AWS.
• Good understanding on CI/CD tools like Jenkins and Github Action.
• Good working understanding of asynchronous messaging frameworks like Preferably Kafka / RabbitMQ.
• Great understanding of distributed systems challenges, micro-service-based architectures and asynchronized communication.
• Exposure to REST API and gRPC
• Experience and good understanding of implement ing, metrics, and logging using tools like Prometheus, CloudWatch, Datadog, Splunk or Kibana.
• Practical knowledge of contract first development model and ability to design API contracts before starting development.
• Practical knowledge of persistence (SQL & No-SQL) and caching solutions such as Mysql, PostgreSQL, Redis, Elastic Search.
• Good understanding of database modelling and fine tune database queries for optimal performance.
• Good understanding with asynchronous, non-blocking, functional/reactive style of programming.
• Hands-on experience with frameworks such as Spring WebFlux, Vert.x,