[Job - 32531] Senior Back End Developer (C# .NET)

At CI&T, we help large enterprises transform the potential of AI into real business impact with AI Deployment, AI-native execution, and tech-integrated business solutions.

With 30 years of experience in technological transformation, we accelerate innovation with expertise in Agentic SDLC, Application modernization, Data & AI, Martech and Business strategy.

We are 8,000 CI&Ters across more than 25 countries, collaborating to build solutions with real impact. AI is already part of how we work, evolve, and innovate every day.

About Us:
At CI&T, our rapid growth is fueled by the innovative solutions we create for our global clients. We are building a proof of concept for a new loan origination system for a large US mortgage lender, delivered through an agentic SDLC harness. This role builds the back end and shows what agentic delivery looks like in practice.
Responsibilities:
Build the POC web application back end in C# using our agentic SDLC harness
Turn SME requirements and the UX/UI designs into working software
Work under the technical leadership of the Software Architect
Use agentic tools in day-to-day delivery
Requirements:
8+ years of experience in software engineering, at High Senior to Staff level
Strong experience with C#
Hands-on use of agentic delivery pipelines in the last 1–2 years
Experience using agentic SDLC tools day to day
Good English
Based in Brazil or Colombia; fully remote, joining calls via Microsoft Teams or Google Meet
Nice to Have:
Front-end experience (full-stack profile)
Experience in the mortgage industry
Join CI&T and be a part of our mission to show what AI-native software delivery can do. If you have a passion for back-end engineering and working in an agentic way, we want to hear from you! Our benefits:   -Health and dental insurance -Meal and food allowance -Childcare assistance -Extended paternity leave -Partnership with gyms and health and wellness professionals via Wellhub (Gympass) TotalPass; -Profit Sharing and Results Participation (PLR); -Life insurance -Continuous learning platform (CI&T University); -Discount club -Free online platform dedicated to physical, mental, and overall well-being -Pregnancy and responsible parenting course -Partnerships with online learning platforms -Language learning platform And many more!   More details about our benefits here: https://ciandt.com/br/pt-br/carreiras   At CI&T, inclusion starts at the first contact. If you are a person with a disability, it is important to present your assessment during the selection process. See which data needs to be included in the report by clicking here.This way, we can ensure the support and accommodations that you deserve. If you do not yet have the assessment, don't worry: we can support you in obtaining it.   We have a dedicated Health and Well-being team, inclusion specialists, and affinity groups who will be with you at every stage. Count on us to make this journey side by side.