[Job - 31975] .NET Developer Senior, Brazil

Ciandt; Brazil; On-site; BRL 180,000 - 320,000; Full time

Benefits offered by this job

Health and dental insurance

Meal and food allowance

Childcare assistance

Extended paternity leave

Wellness program via Wellhub (Gympass)

Profit Sharing and Results Participa-

Life insurance

CI&T University – continuous learning

Discount club

Well-being platform

Language learning platform

Job summary

CI&T is hiring a Senior .NET Engineer to design, implement, and maintain backend services using C#, .NET Framework/Core, ADO.NET, and SQL Server. You will build SOAP/REST APIs, review code, mentor juniors, and drive improvements across a multicultural team spread across Brazil and beyond.

Expect involvement in CI/CD workflows, testing, and adopting new technologies. Strong English proficiency and a collaborative mindset are essential for success.

Qualifications

• Strong experience with .NET Framework and .NET Core in production systems.
• Deep knowledge of ADO.NET and SQL Server.
• Experience with database design and performance optimization.
• Hands-on experience building SOAP and REST APIs.
• XML data reading and writing.
• Understanding of software design patterns and best practices.
• Advanced English proficiency.
• Ability to work in multicultural, fast-paced teams.

Responsibilities

• Design, build, and maintain back-end services using C#, ADO.NET, and SQL Server.
• Create and improve SOAP and REST APIs following best practices.
• Write unit tests and integration tests to ensure service reliability.
• Identify and fix root causes in code.
• Integrate different systems using design patterns.
• Review code and mentor junior developers.
• Learn new technologies and improve current solutions.
• Contribute to CI/CD workflows for automated testing and deployment.

Skills

.NET Framework

.NET Core

ADO.NET

SQL Server

SOAP APIs

REST APIs

XML

Software design patterns

English proficiency

Multicultural teamwork

Tools

Azure

CI/CD pipelines

Job description

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.

We are hiring a Senior .NET Engineer to join our team and help build complex back-end software solutions. You will work with a multicultural team spread across Brazil, Colombia, the UK, and the USA. All communication will be in English.

As a Senior .NET Engineer, you will design solutions, help guide less experienced developers, and help the team adopt new technologies and best practices.

What You Will Do

• Design, build, and maintain back-end services using C#, ADO.NET, and SQL Server
• Create and improve SOAP and REST APIs (following best practices and version standards)
• Write unit tests and integration tests to make sure services work correctly
• Find and fix problems in the code (root-cause analysis)
• Help integrate different systems and services together (using software design patterns)
• Review other developers’ code and provide guidance to junior team members
• Learn about new technologies and find ways to improve our current solutions
• Work on CI/CD workflows (automated testing and deployment) to improve how the team works

What You Need to Know

• Strong experience with .NET Framework and .NET Core in real production systems
• Deep knowledge of ADO.NET and SQL Server
• Experience with database design and making databases work faster
• Hands-on experience building SOAP and REST APIs
• Ability to work with XML (reading and writing XML data)
• Strong understanding of software design patterns and best practices
• Advanced English proficiency
• Ability to work well in multicultural, fast-paced teams

Soft Skills

• Takes ownership of your work and always looks for ways to improve
• Communicates clearly with both technical and non-technical people
• Works well with others and values the team’s success
• Can adapt when requirements change or situations are unclear

Nice to Have

• Experience with cloud platforms (preferably Azure)
• Knowledge of specification-driven development (building code based on clear requirements)
• Exposure to Agile development methods
• Understanding of modern software development approaches

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.