We're hiring! We are looking for a Senior .NET Developer based in Brazil to join a product engineering team building the core of a modern, scalable SaaS platform.This is a hands-on senior role for someone who enjoys solving complex backend challenges, designing clean architectures, and building systems that support multiple products and teams. You'll work on a platform with strong focus on microservices, multi-tenant architecture, cloud infrastructure, observability, and secure backend development.We're looking for someone who is highly autonomous, communicates well in English, and is excited about using AI-assisted development tools as part of a modern engineering workflow.ResponsibilitiesDesign, build, and maintain backend services using C# and modern .NETDevelop and evolve REST APIs and microservicesContribute to the architecture of a multi-tenant SaaS platformHelp shape domain models, technical patterns, and scalable backend foundationsWork on systems related to authentication, authorization, observability, and CI/CDBuild solutions designed for high throughput, async workloads, and performanceCollaborate with engineering and product teams to extend platform capabilitiesParticipate in technical discussions, architecture decisions, and implementation planningWrite clean, maintainable, and well-documented codeUse AI-assisted development tools to improve speed, quality, and deliveryRequirementsStrong written and spoken EnglishCNPJ in Brazil + ability to issue monthly Nota Fiscal5-8 years of professional experience with C# and the .NET ecosystemProven experience building and maintaining RESTful APIs and microservicesStrong knowledge of Entity Framework Core, LINQ, and relational database designSolid understanding of dependency injection, async/await, and backend performance optimizationHands-on experience with Domain-Driven Design (DDD) in real production systemsStrong understanding of CQRS, mediator patterns (such as MediatR), and event-driven architectureExperience designing modular, maintainable systems for complex business domainsExperience building systems that handle high-volume requests, async processing, and scalable workloadsGood understanding of large-file or document processing patterns such as streaming, buffering, and memory-efficient pipelinesExperience with message brokers such as Azure Service Bus, RabbitMQ, or similarHands-on experience with Microsoft AzureStrong working knowledge of Docker and KubernetesExperience with CI/CD pipelines using Azure DevOps and/or GitHub ActionsExperience with multi-tenant SaaS or enterprise-grade backend platformsUnderstanding of JWT / OAuth2, secure backend design, and secrets managementExperience with observability tools such as Grafana, Loki, or equivalentActive use of AI-assisted development tools such as GitHub Copilot, Claude Code, or similarNice to HaveExperience with Temporal or workflow orchestration toolsExperience with OpenAI, Azure OpenAI, Anthropic, or LLM integrationsExperience with document-heavy, enterprise, or compliance-sensitive systemsExperience with distributed systems and event-driven platforms at scaleWhat We're Looking ForStrong ownership and accountabilityClear communication and ability to work directly with technical stakeholdersComfort working independently in a remote environmentSomeone who cares about software quality, reliability, and maintainabilityA senior engineer who can combine hands-on execution with architectural thinkingGenuine interest in how AI is changing software development workflows