Senior Backend Developer – .NET (454)

Info on the Senior Backend Developer – .NET  role

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 the top 5% of Brazilian tech talent for their LATAM strategy, offering a unique combo of staff augmentation and employer-of-record services. Ubiminds is supporting a US-based product organization modernizing a Management platform, focused on building shared core services to accelerate scalability, security, and consistency across the product suite.

We’re looking for a Senior Backend Developer – .NET  to help design, build, and integrate core platform services that will power the next generation of an HCM product portfolio.

This role sits at the heart of platform modernization, working on foundational systems such as shared data models, unified authentication, and common administration tooling, while supporting product teams as they migrate to the new architecture.

- Break down large or complex problems into smaller parts, design clean solutions, and implement the core framework.

- Build and maintain RESTful APIs and backend services using C#, .NET Core, Entity Framework, and Web API.

- Apply software architecture patterns like Domain-Driven Design (DDD) and CQRS to build modular and scalable systems.

- Work directly with SQL Server—designing databases, writing stored procedures, optimizing queries, and tuning performance.

- Use Entity Framework (EF Core or EF6) for ORM and data access.

- Write clean, testable, and maintainable code with proper documentation.

- Take full ownership of testing your own code—unit, integration, and performance testing—as part of a Shift Left / No QA team setup.

- Collaborate with product managers and other teams to understand requirements and deliver customer-focused features.

- Use AI development tools (required)—including GitHub Copilot, Claude, or similar—to assist with code generation, refactoring, documentation, and development speed.

- 5+ years of experience in enterprise or SaaS software development.

- Strong hands-on experience with:

- C#, .NET Core, Web API

- Entity Framework (EF Core or EF6)

- SQL Server – writing queries, stored procedures, indexing, and performance tuning

- Solid understanding of object-oriented programming, design patterns, and enterprise architecture.

- Experience with DDD, CQRS, and clean layering of business logic and data access.

- Familiarity with multi-threading, asynchronous programming, and system performance tuning.

- Comfortable with Git and working in a modern development environment (CI/CD, Agile).

- Strong debugging and troubleshooting skills.

- Excellent communication skills (written and verbal) in English.

- Experience working across multiple teams or squads.

- Required: Active daily use of AI development tools like GitHub Copilot, Claude, or similar in your workflow.

- Real-world experience building AI-powered features (e.g., smart forms, intelligent search, NLP features).

- Experience working in a Shift Left environment with full feature ownership—design to production.

- Exposure to event-driven architecture or messaging patterns.

- People First. We are all about people!

- Challenge yourself. There’s always room for improvement and continuous improvement is in our essence.

- Make it happen. Be ready to take challenges as they come. It’s all about attitude and commitment.

- We’re in this together. We work as a team, thrive as a team, and evolve as a team.

- Averaging on awesome. We work hard to deliver high-quality services and look forward to exceeding expectations.

- Keep it real. We promise you honesty, transparency, and openness, regardless of the situation.

As a Senior Backend Developer – .NET  @Ubiminds, you:

- You are placed in a product-based company, with the same treatment as their full-time employees.

- Have our full back-office support, from career guidance to HR and concierge services.

- Enjoy our remote-first policy – we are a distributed team, after all.

- Get your own MacBook (none of that "bring your own device" stuff here).

- Have access to growth opportunities with other amazing technology professionals, through tech talks, chapter meetings, and even remote happy hours for tons of fun!

- Improve your English through free lessons with a native English speaker - get to the next level on your communication skills!

- Candidate Referral bonus (promote Ubi to your tech friends, and get paid for it!)

- Miss working in the office? Our cool Florianópolis headquarters is available, whenever you want, with weekly quick massages & tasty snacks, soft drinks, and games

1. Interview with Tech Recruiter (chat about the job opening and your experiences)

2. Technical Assessment

3. Client Interview

4. Offer (yay)