.NET Back-End Developer

Come join our team! DruidAI is an agentic AI scale-up with traction, customer base, and market recognition to stand out in one of the fastest-moving categories in enterprise software. We help organizations move beyond AI experiments to production-ready AI agents that automate real business processes across healthcare, higher education, retail, banking, insurance, and employee-facing workflows. With strong growth, hundreds of enterprise customers, a global partner ecosystem, and recognition in the Gartner Magic Quadrant for Conversational AI Platforms, Druid has clear product-market fit and a credible platform story in a market being reshaped by agentic AI. With a 2x growth year over year, 160+ partners and 250+ clients worldwide, DRUID AI actively builds on its vision to provide employees with an intelligent virtual assistant that helps people work easier and faster. We are seeking an experienced .NET Back-End/Full-Stack Developer to join our engineering organization. The successful candidate will be responsible for designing, implementing, and operating scalable back-end services and APIs that power our front-end applications. This is a hands-on engineering role requiring deep knowledge of modern .NET (C#/.NET 8), microservice architectures, cloud messaging and persistence technologies, and best engineering practices (Clean Code, SOLID, Git Flow). What you’ll do at DRUID Design, implement and maintain robust, secure, and highly available back-end services using .NET 8 / C# and ASP.NET Core Build and operate background jobs and microservices (e.g., WebJobs, worker services) that integrate into the Platform Implement and maintain APIs (REST/gRPC) and real-time endpoints (HTTPS, WSS) Integrate and operate messaging solutions using Azure Service Bus and RabbitMQ (AMQPS) Design and implement data access layers for relational and NoSQL stores (MS SQL Server, MongoDB, Elasticsearch, Redis) Apply observability best practices: structured logging, metrics and distributed traces (OpenTelemetry) Ensure services are secure, performant, and can be deployed via CI/CD pipelines Collaborate closely with frontend, DevOps and product teams to define APIs, SLAs and operational runbooks Participate in code reviews, architecture reviews, and mentor junior engineers Champion engineering standards: Clean Code, SOLID principles, automated testing and Git Flow. What you’ll bring to DRUID Minimum 4 years of professional backend or full-stack development experience Strong proficiency in C# and modern .NET (preferably .NET 6/7/8) Hands-on experience with ASP.NET Core for building web APIs and services Experience building background processing or scheduled jobs (WebJobs, worker services) Familiarity with microservice patterns, containerization concepts and service discovery Practical experience with messaging and brokered communication (Azure Service Bus, RabbitMQ, AMQPS) Solid experience with data storage technologies: MS SQL Server, MongoDB, Elasticsearch, Redis (designing schemas, indexes, query performance) Understanding of networking and protocols used by our platform: HTTPS, WSS (WebSockets), gRPC, AMQPS Experience with observability and telemetry (logs, metrics, traces) familiarity with OpenTelemetry is desirable Strong software engineering fundamentals: SOLID, test-driven development, code reviews, and version control (Git, Git Flow) Experience in integrating services with CI/CD pipelines and automated deployments Prior experience with Azure cloud services (App Services, Functions, Service Bus, AKS) and/or other cloud platforms Experience with containerization (Docker) and orchestration (Kubernetes) Familiarity with API gateways, security (OAuth2/JWT) and enterprise integration patterns Exposure to large language model (LLM) frameworks, vector stores, or other AI/ML service integration Experience with performance profiling, caching strategies and capacity planning Public contributions or open source / GitHub profile demonstrating real-world projects Excellent problem solving, documentation and cross-team communication skills. What’s in it for you at DRUID Competitive compensation and benefits package Opportunity to work on a market-leading agentic AI platform deployed internationally Structured professional development, technical mentorship and a collaborative engineering culture Hybrid working model with modern office facilities in central Bucharest (Opera Center One) Access to technical conferences, training and internal knowledge programs International exposure with opportunities for client engagements and travel.