Senior Full Stack Software Engineer - .NET/React

Challenge

We are seeking a Senior Full Stack Software Engineer to join our platform team. You will help maintain and enhance a critical codebase, focusing primarily on backend systems built with .NET and frontend components using React and TypeScript. This role involves close collaboration with other engineers and cross-functional teams to resolve issues, improve reliability, and deliver incremental improvements, with opportunities to expand into more feature-driven work over time.

What you'll do

• Design, implement, and maintain robust .NET Core services and APIs within a microservices architecture.
• Build responsive and accessible front-end experiences using React and TypeScript.
• Write clean, testable, and scalable code, following modern engineering best practices.
• Support automated test coverage for high-quality releases.
• Participate in design reviews, code reviews, and technical planning.
• Help identify and reduce technical debt across the platform.

In order to succeed in this position, you will need:

Mandatory skills

• 7+ years of professional experience with .NET Core / C# for web applications.
• Solid experience with REST APIs and microservices design.
• Experience with cloud platforms and tooling (e.g., Azure, AWS, or GCP).
• Strong proficiency with JavaScript, HTML, CSS, and frameworks like React.
• Experience with relational databases and ORMs such as Entity Framework Core.
• Familiarity with Git workflows and source control best practices.
• Basic reading and writing skills in English (used for reading documentation, variable naming, and code comments).
• Ability to collaborate in distributed, remote teams.

Nice to Have

• Experience working on high-scale enterprise platforms.
• Familiarity with automated testing tools: xUnit, NUnit for .NET; Jest, Cypress for front-end.
• Experience with Docker, Kubernetes, or other container orchestration tools.
• Experience with observability tools such as OpenTelemetry, Datadog, etc.
• Exposure to legacy-to-modern migration projects.
• Knowledge of secure coding practices.

Perks and Benefits

As a Senior Full Stack Software Engineer @Ubiminds, 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.