Senior .Net Backend Engineer

N-iX is looking for a talented Senior .Net Engineer to join our team! Our client is one of Europe's fastest-growing mobile companies with 6 million active customers, 1,000 employees worldwide, and operations in five countries. The client is using the mobile virtual network operator business model. We are looking for a Senior .NET Engineer who combines strong technical expertise with a product mindset, proactive problem-solving, and end-to-end ownership of delivery. Responsibilities: Take end-to-end ownership of features and services, from requirements clarification and technical design through implementation, testing, deployment, and production support. Deliver reliable, scalable, and maintainable back-end solutions using modern .NET technologies and engineering best practices Understand business requirements, product objectives, and customer impact to make pragmatic technical decisions and deliver business value Collaborate closely with Product Owners, Business Analysts, QA Engineers, DevOps, Support Engineers, Architects, Infrastructure and DB Engineers, and other teams to ensure successful delivery Proactively identify and address technical risks, dependencies, blockers, and potential delivery challenges Contribute to system design, architectural decisions, technical improvements, and ongoing platform modernisation Take ownership of production issues, troubleshooting, root-cause analysis, and improvements to system reliability and performance Ensure high engineering quality through code reviews, automated testing, observability, and continuous improvement Confidently communicate in a multinational environment, communication is in English. Design, build, and maintain performant, efficient, reusable, and reliable code Translate business logic into code and automate business processes Support and mentor other engineers, share knowledge, and promote engineering best practices Requirements: 6+ years of commercial .NET development in Microservice environment Strong knowledge of modern .NET (8/9 or later) Web API, ASP.NET Core, Microservices Strong experience with SQL, MS SQL Server, Entity Framework, and database performance optimisation Good understanding of Docker, Kubernetes, and containerised application environments Solid understanding of software architecture, microservices, design patterns, SOLID principles, and clean code practices Hands-on experience with Microsoft Azure Cloud Experience with Messaging or Evening (ServiceBus, RabbitMQ, EventHub, Kafka,. Etc.) Experience designing and integrating REST APIs, SOAP and third-party services. Hands-on experience with serverless architectures and cloud functions (Azure Functions, AWS Lambda) Experience with automated testing, CI/CD practices, and production troubleshooting Strong problem-solving skills, proactive communication, and the ability to identify risks and propose solutions Being result-oriented, ability to get things done Excellent verbal and written English communication skills, with the ability to confidently lead technical discussions, articulate complex topics, challenge decisions constructively, and communicate effectively with both technical and non-technical stakeholders Would be a plus: Production experience with durable-execution, stateful distributed-systems platform (Microsoft Orleans, Temporal, Azure Durable Task Framework, Akka, Dapr Actors, Cadence, Netflix Conductor, Erlang/OTP) Day-to-day responsibilities involves dealing with long-running workflows, stateful coordination, distributed execution, failure recovery, retries, idempotency in production Serious experience in Event Driven Architecture Experience with microservice practices, i.e. Service mesh, Blue/Green deployments, ArgoCD, etc. Experience with Stored procedures in MS SQL Experience with .Net Native AOT Experience with Monitoring (Azure Application Insights, Open Telemetry, etc.) Azure LogicApps, API Apps, AKS, Redis Experience integrating with Microsoft Dynamics CRM or similar enterprise systems Experience working with high-availability, business-critical, or transaction-processing systems We offer*: Flexible working format - remote, office-based or flexible A competitive salary and good compensation package Personalized career growth Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more) Active tech communities with regular knowledge sharing Education reimbursement Memorable anniversary presents Corporate events and team buildings Other location-specific benefits *not applicable for freelancers