Senior Engineer - Angular .NET Core AWS 526

Info on the Senior Engineer – Angular / .NET Core / AWSrole

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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 enterprise applications, solving complex technical challenges, and delivering high-quality software in a fast-paced environment.

In this role, you will take ownership of designing, developing, and maintaining backend services and APIs while contributing to architectural decisions and system scalability. You'll work closely with product and engineering teams to deliver customer-focused solutions and help drive engineering excellence across the organization.

The ideal candidate is a hands-on engineer who combines strong technical expertise with a proactive mindset, takes ownership of quality through testing, and actively leverages modern AI-powered development tools to improve productivity and code quality.

Responsibilities

• Design and implement scalable, maintainable, and high-performance enterprise SaaS applications.
• Break down complex business requirements into well-structured technical solutions.
• Develop and maintain RESTful APIs and backend services using C#, .NET Core, and Web API.
• Apply software architecture principles including Domain-Driven Design (DDD) , CQRS , and clean architecture patterns.
• Design, optimize, and maintain SQL Server databases , stored procedures, and data access layers.
• Build solutions using Entity Framework (EF Core or EF6) for ORM and database interaction.
• Write clean, testable, maintainable, and well-documented code.
• Take ownership of quality by implementing unit, integration, and performance testing .
• Collaborate with Product Managers, Engineers, and cross-functional teams to deliver business value.
• Troubleshoot and resolve performance, scalability, and reliability issues.
• Leverage AI-assisted development tools such as GitHub Copilot, Claude, or similar platforms to improve development workflows.
• Participate in code reviews, technical discussions, and architectural planning.

Mandatory Skills

• 5+ years of experience developing enterprise o