Role overview:We are seeking a Senior Backend Developer to design, build, and maintain robust, scalable backend services and APIs powering Client facing Portal applications. The ideal candidate has strong object-oriented development skills, experience with containerized/cloud-native deployment, and the ability to collaborate closely with front-end teams to deliver well-integrated, performant solutions.What can we offer?Start as soon as possibleB2B Contract or Temporary Employment ContractWork mode: Hybrid in Warsaw (3 times per week from office)Salary: Up to 190 PLN net+VAT/h (B2B) / Up to 22 350 PLN gross/month (Temp)Project in the banking sectorRequirements:At least 8+ years of backend software development experience, with strong expertise in Java or .NETStrong Java or .NET development experience (Spring Boot / .NET Core preferred)Experience building and consuming REST APIsExperience with containerized applications and orchestration (Docker/Kubernetes/OpenShift)Working SQL/database experience (relational data modeling, query optimization)Familiarity with CI/CD pipelines and automated testing practicesNice to have:Experience with messaging/event-driven architectures (Kafka, MQ, etc.)Financial services, fund administration, or transfer agency domain experienceExposure to cloud-native development practicesResponsibilities:Develop and maintain backend services and RESTful APIs using Java or .NETDesign data models and integrate with relational/NoSQL databases as required by portal functionalityCollaborate with front-end developers to define API contracts and ensure smooth integrationBuild and deploy services within containerized environments (Docker/Kubernetes/OpenShiftImplement secure coding practices, unit/integration testing, and CI/CD pipeline integrationOptimize service performance, scalability, and reliabilityTroubleshoot and resolve production issues, participating in on-call/support rotations as neededParticipate in Agile ceremonies, sprint planning, and technical design discussions

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