Senior Back End Developer (C# .NET)

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Back End Developer (C# .NET) based in Brazil.

We are looking for an experienced Senior Back End Developer to help build a proof of concept for a next-generation loan origination platform for a major US mortgage lender. In this role, you will design and develop robust backend solutions using C# and .NET within an innovative, AI-native software delivery environment. You will translate business requirements and UX/UI designs into functional, scalable software while working alongside experienced technical leaders. A key aspect of the position is leveraging agentic AI tools and development pipelines to accelerate engineering workflows and improve delivery quality. You will contribute to demonstrating how AI-driven software development can transform the way complex applications are built. This is an exciting opportunity for a highly experienced engineer who enjoys technical challenges, autonomy, and working at the forefront of software engineering innovation.

Accountabilities

• Design, develop, and maintain the backend of a proof-of-concept web application using C# and .NET.
• Translate requirements gathered from subject matter experts (SMEs) and UX/UI designs into functional, reliable, and maintainable software.
• Work under the technical direction of the Software Architect, contributing to architectural decisions and implementation strategies.
• Use agentic Software Development Life Cycle (SDLC) tools and AI-assisted development pipelines as part of daily engineering activities.
• Apply modern development practices to accelerate implementation while maintaining code quality, reliability, and performance.
• Collaborate with technical and business stakeholders to ensure requirements are clearly understood and translated into effective backend solutions.
• Contribute to demonstrating the capabilities and practical value of AI-native software delivery within a complex financial services environment.

Requirements

• At least 8 years of professional software engineering experience, operating at a High Senior to Staff Engineer level.
• Strong hands-on experience with C# and .NET backend development.
• Recent practical experience using agentic software delivery pipelines, ideally within the last 1--2 years.
• Demonstrated experience incorporating agentic SDLC tools into everyday software development workflows.
• Ability to translate business requirements and design specifications into high-quality technical implementations.
• Strong problem-solving skills, technical autonomy, and the ability to work effectively under architectural guidance.
• Good English communication skills, both written and spoken, to collaborate with international teams.
• Must be based in Brazil or Colombia and comfortable working remotely.
• Availability to participate in virtual meetings through Microsoft Teams or Google Meet.
• Nice to have:
• Frontend development experience or a broader full-stack engineering background.
• Previous experience in the mortgage industry or financial services.
• Familiarity with loan origination systems and related financial workflows.

Benefits

• Fully remote work model.
• Health and dental insurance.
• Meal and food allowances.
• Childcare assistance.
• Extended paternity leave.
• Life insurance.
• Profit-sharing and annual results participation (PLR).
• Gym and wellness partnerships through Wellhub (Gympass) and TotalPass.
• Access to a continuous learning platform through CI&T University.
• Discounts through a dedicated benefits club.
• Free online resources focused on physical, mental, and overall well-being.
• Pregnancy and responsible parenting courses.
• Partnerships with online learning platforms.
• Access to language learning programs.
• Additional health, wellness, and professional development initiatives.
• Inclusive recruitment process, with dedicated support and reasonable accommodations for professionals with disabilities.