Senior Java Engineer

Our client: KlarnaLocation:Warsaw (hybrid work: 2-3 days in the office)Rate: PLN per hourCooperation model: B2B or Employment ContractStart date: ASAPDuration: long-term agreementRecruitment process: 1 timed Abstract and Logical Reasoning Test (up to 15 minutes); 1 short interview (up to 30 minutes)Technology stack: Java (latest versions), Spring, Spring Boot, Docker, Kubernetes, Kafka, PostgreSQL, DynamoDB, Elasticsearch, Microservices architecture on AWSDo you want to play a key role in revolutionizing the future of finance? Join Klarna - a global leader in deferred payments, with over 85 million active users and 2.5 million transactions processed daily As a pioneer in modern payment solutions, Klarna is developing innovative methods that streamline the shopping experience, enhance transaction security, and expand the availability of purchasing options.We're seeking individuals eager to achieve remarkable results and share their bold vision to redefine the future of payments and fintech. Send us your CV - we can't wait to meet youYour role is:> To work within a key problem space, addressing the client's immediate needs by designing, developing, and deploying backend services that prioritize scalability, high availability, and low latency;> To collaborate and grow in a dynamic and autonomous environment while working in small, agile, and cross functional teams;> To use the latest technologies to solve real problems for customers at a massive scale;> To be part of a team that will take full operational responsibility for the services that you own, and potentially take part in an on-call rotation;> To share your knowledge and build creative solutions while helping the team evolve best practices.Your skills and experiences:> 6+ years of experience with Java (version 17 and up);> Framework knowledge: Spring Framework (Spring Boot, Spring MVC), Hibernate or JPA;> Tools: Docker and CI/CD tools (e.g., Jenkins, GitLab);> Databases: Strong SQL skills with hands-on experience in relational databases;> Testing: Proficiency in unit testing (JUnit, Mockito) and integration testing tools;> Cloud & DevOps: AWS cloud infrastructure and microservices architecture;> System Design: Solid experience with microservices architecture, scalability, and system integration;> Strong educational background in Computer Science, Information Technology, or a related field;> Experience in driving complex projects from start to finish, guiding and mentoring teams;> Experience in contributing to architectural design and system-wide decision-making with proven track record of both technical and organizational impact;> Language proficiency: Advanced English (minimum B2 level).Nice to have:+ Other Java frameworks and Spring Security;+ Kubernetes and CI/CD best practices;+ NoSQL databases, PostgreSQL, and database performance tuning;+ Performance testing and automation frameworks experience;+ DevOps tools (Terraform, CDK) and monitoring tools (Prometheus, Datadog);+ Understanding of distributed systems, event-driven architecture (Kafka, RabbitMQ);+ Awareness of security best practices, API design (RESTful, GraphQL), and container orchestration tools.Our client offers:+ Great opportunity for personal development in a stable and friendly large multinational company;+ Start-up mentality, small agile teams;+ Global Reach: Impact millions with seamless shopping and payments;+ Career growth and additional education.If interested, please apply safely through this portal (application rules are in accordance with GDPR). Employment agency Nr 17138.