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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 or SaaS applications.
- Strong expertise in C#, .NET Core, ASP.NET Web API, and backend application development.
- Hands-on experience with Entity Framework (EF Core or EF6).
- Strong knowledge of SQL Server, including query optimization, stored procedures, indexing, and performance tuning.
- Experience with Angular or other modern front-end frameworks.
- Solid understanding of Object-Oriented Programming (OOP) and software design patterns.
- Experience implementing DDD, CQRS, and layered architectures.
- Familiarity with asynchronous programming, multi-threading, and performance optimization.
- Experience with Docker, CI/CD pipelines, and modern DevOps practices.
- Strong debugging, troubleshooting, and problem-solving skills.
- Professional English communication skills, both written and verbal.
- Active daily use of AI development tools such as GitHub Copilot, Claude, Cursor, or similar.
Nice to Have
- Experience with Microservices Architecture.
- Familiarity with event-driven architectures and messaging systems.
- Experience working across multiple engineering teams or squads.
- Exposure to cloud platforms such as AWS or Azure.
- Experience building highly scalable distributed systems.
- Knowledge of software observability, monitoring, and performance metrics.
Team & Environment
- Collaborative engineering culture focused on ownership and accountability.
- Modern SaaS environment with strong emphasis on software quality.
- High degree of autonomy and technical ownership.
- Opportunity to work with AI-assisted software development practices.
- Cross-functional collaboration with Product, Engineering, and business stakeholders.
- Engineering-driven culture focused on continuous improvement and innovation.
About Ubiminds
Our Culture
People First. We are all about people!
Challenge Yourself. Continuous improvement is in our essence.
Make it Happen. We value attitude, ownership, and commitment.
We’re in This Together. We work, grow, and evolve as a team.
Averaging on Awesome. We deliver high-quality services and exceed expectations.
Keep it Real. Honesty, transparency, and openness — always.
Perks and Benefits
As a Senior .NET Engineer @Ubiminds, you:
- Are placed in a product-based company and treated like a full-time team member.
- Count on our full back-office support: career guidance, HR, and concierge services.
- Enjoy our remote-first policy.
- Get your own MacBook (no BYOD here!).
- Access tech talks, chapter meetings, and a strong community of top engineers.
- Improve your English through free lessons with a native English speaker.
- Earn a referral bonus when recommending new Ubiminders.
- Want office vibes sometimes? Our Florianópolis HQ is open — snacks, massages, drinks, and games included.