About the RoleWe continue to develop and expand a suite of internal web applications that support the core operations of our insurance brokerage and financial services business. We are looking for a Senior .NET Developer based in Cluj-Napoca to support the evolution of these systems, with a focus on backend development, architectural design, and performance optimization.In this role, based on a full-time labour contract, you will collaborate closely with frontend developers, business analysts, and infrastructure teams, while also contributing to technical decisions that influence system performance, reliability, and long-term maintainability..Tech stack: .NET / C# / SQL Server / REST APIsBackend & System ArchitectureDesign, develop, and maintain scalable APIs and backend services using modern .NET frameworks and C#Design and optimize N-tier applications with modular, service-based architecturesDefine and improve database schemas and data access patterns, primarily using SQL ServerPerformance, Security & DevOpsOptimize backend performance through efficient queries, caching strategies, and asynchronous processingImplement security best practices, including data encryption at rest and in transitSupport on-premises deployments, including CI/CD pipelines and deployment automationContribute to system reliability, monitoring, and long-term maintainabilityTechnical Leadership & CollaborationSupport backend and frontend developers by promoting best practices and knowledge sharingLead code reviews, technical discussions, and architectural decisionsGuide API design to ensure clean integration with frontend applicationsCollaborate with stakeholders to define technical roadmaps and implementation prioritiesExperience & Skills7+ years of professional experience in .NET developmentStrong expertise in C#, .NET, and backend API developmentSolid understanding of N-tier architectures, domain-driven design, and modular systemsExtensive experience with SQL Server, including schema design and performance optimizationHands-on experience with ORM tools (e.g. Entity Framework)Experience with CI/CD pipelines, security practices, and on-premises environmentsFamiliarity with message queuing systems (RabbitMQ, Redis, or similar)Ability to lead technically, mentor peers, and support frontend integrationPreferred QualificationsUnderstanding of frontend frameworks (React, Vue, or similar) to guide API designExperience building enterprise-grade, secure on-premises applicationsExposure to the insurance or financial services domainAbout Kunden BrokerKunden Broker is an established insurance brokerage and integrated financial services company with over 20 years of presence in Romania.We develop and maintain stable internal systems that support real business operations, with a strong focus on reliability, security, and long-term maintainability. Show more Show less