Senior Engineer – Angular / .NET Core / AWS

Info on the Senior Engineer – Angular / .NET Core / AWSrole Want to get to the next step in your international career? We can support you! Ubiminds is a GPTW-certified, people-first company that partners with American software product companies to scale their development footprint. Ubi custom-curates Brazilian top 5% talent for their LATAM strategy, offering a unique combo of staff augmentation and employer-of-record services. Ubiminds is assisting a growing SaaS company that develops enterprise-grade software solutions used by businesses worldwide. As the platform continues to scale, they are expanding their engineering team to build robust, high-performance applications while embracing modern development practices, AI-assisted engineering, and cloud-native architectures. Challenge We’re looking for a Senior .NET Engineer who is passionate about building scalable SaaS applications, solving complex technical challenges, and delivering high-quality software from design to production. In this role, you will work across backend and front-end technologies, designing and implementing robust solutions using .NET and modern web frameworks. You will take ownership of features throughout the entire development lifecycle, including architecture, implementation, testing, performance optimization, and deployment. The engineering culture embraces a Shift Left mindset , where engineers are fully responsible for the quality of their code through automated testing, continuous improvement, and proactive problem-solving. The ideal candidate is highly collaborative, comfortable working across multiple teams, and actively leverages AI-powered development tools to improve productivity and software quality. Responsibilities Design and implement scalable, maintainable, and high-performance SaaS applications. Break down complex business requirements into clean, well-structured technical solutions. Build and maintain RESTful APIs and backend services using C#, .NET Core, Web API, and Entity Framework. Apply software architecture principles including Domain-Driven Design (DDD) , CQRS , and clean architecture patterns. Design, optimize, and maintain SQL Server databases , stored procedures, indexes, and data access layers. Develop and maintain front-end applications using Angular or similar modern frameworks. Write clean, testable, maintainable, and well-documented code. Take full ownership of unit, integration, and performance testing as part of a Shift Left engineering culture. Collaborate closely with Product Managers, Engineers, and stakeholders to deliver customer-centric solutions. Troubleshoot and resolve performance, scalability, and reliability issues. Leverage AI-assisted development tools such as GitHub Copilot, Claude, Cursor, or similar platforms to accelerate development and improve code quality. Participate in code reviews, architectural discussions, and continuous improvement initiatives. Mandatory Skills 5+ years of experience building enterprise or SaaS software applications . Strong expertise in C#, .NET Core, ASP.NET Web API , and backend development. Hands-on experience with Entity Framework (EF Core or EF6) . Strong experience with Angular or other modern front-end frameworks. Deep knowledge of SQL Server , including query optimization, stored procedures, indexing, and performance tuning. Solid understanding of Object-Oriented Programming (OOP) , software design patterns, and enterprise architecture. Experience implementing DDD, CQRS, and layered application architectures . Familiarity with multi-threading, asynchronous programming, and performance optimization . Experience working with Git, CI/CD pipelines, and Agile development practices . Strong debugging, troubleshooting, and problem-solving skills. Excellent written and verbal communication skills in English. Active daily use of AI-powered development tools such as GitHub Copilot, Claude, Cursor, Windsurf, or similar. Nice to Have Experience building AI-powered product features , such as intelligent search, NLP-driven functionality, recommendation engines, or smart forms. Experience working in Shift Left / No QA environments with end-to-end feature ownership. Familiarity with event-driven architectures and messaging systems . Exposure to Microservices Architecture . Experience with cloud platforms such as AWS or Azure . Experience working across multiple squads or distributed engineering teams. Team & Environment Engineering culture focused on ownership, accountability, and quality. Shift Left mindset with strong emphasis on automated testing and software reliability. Collaborative environment with close interaction between Product and Engineering teams. Opportunity to work with modern AI-assisted development workflows. Fast-paced SaaS environment focused on scalability, innovation, and customer impact. Strong focus on continuous improvement and engineering excellence. About Ubiminds Our Culture People First. We are all about people! Challenge Yourself. Con