Senior Software Engineer (Backend)

As a senior software engineer, you will help modernize the backend architecture supporting B2C and B2B customers by building a scalable, modular architecture, creating RESTful APIs for data access, and implementing core business logic for our platform.

Responsibilities:

• Collaborate in building a modular monolith architecture following modern software engineering best practices
• Define and enforce clear module boundaries, ownership, and contracts
• Develop application code that is secure, well tested, well documented, extensible, and scalable
• Work closely with cross-functional teams to align technical solutions with business goals
• Participate in code reviews, mentoring, and knowledge sharing within the engineering team
• Contribute to backend architecture decisions, including tooling, frameworks, and standards

Required Qualifications:

• 6+ years of professional experience in backend application development
• Strong expertise in C#, .NET Core (modern versions preferred)
• Hands-on experience modernizing or refactoring legacy applications
• Strong understanding of modular monolith architecture
• Deep understanding of architectural design principles (Clean Architecture, Vertical Slices).
• Experience designing and working with relational databases (SQL Server, PostgreSQL, or similar)
• Experience building and consuming RESTful APIs
• Experience with unit, integration, and automation testing tools (e.g.: Playwright)
• Experience with agentic AI development, utilizing tools such as Claude, Copilot, and Cursor
• Strong problem-solving, communication, and collaboration skills
• Bachelor’s degree in Computer Science, Software Engineering, or a related field, or equivalent technical experience

Avenue Code reinforces its commitment to privacy and to all the principles guaranteed by the most accurate global data protection laws, such as GDPR, LGPD, CCPA and CPRA. The Candidate data shared with Avenue Code will be kept confidential and will not be transmitted to disinterested third parties, nor will it be used for purposes other than the application for open positions. As a consultancy company, Avenue Code may share your information with its clients and other companies from the AI/R company to which Avenue Code’s consultants are allocated to perform its services.