Senior .NET Engineer: Build Scalable Back-End APIs

CI&T; United States; Remote; USD 110,000 - 170,000; 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

Life insurance

CI&T University

Discount club

Well-being platform access

Parenting resources

Learning platform partnerships

Language learning platform

Job summary

CI&T is seeking a Senior .NET Engineer to drive development and integration of robust back-end software solutions. You will work closely with a multicultural team across Brazil, Colombia, the UK, and the USA, collaborating in English to deliver scalable services.

Join us to design APIs, ensure reliability with testing, mentor junior engineers, and contribute to CI/CD practices while staying current with evolving tech trends.

Qualifications

• .NET Experience: strong experience with .NET Framework and .NET Core in production systems.
• Backend Development: hands-on experience building back-end services with C#, ADO.NET, and SQL Server.
• APIs & Integration: solid experience implementing and evolving SOAP and RESTful services, including versioning and best practices.
• Data & Persistence: strong understanding of ADO.NET, SQL Server, database design and performance tuning.
• XML: proficiency in XML serialization/deserialization.
• Software Design: solid grasp of software design patterns and engineering best practices.
• Testing & Reliability: experience with unit and integration testing, troubleshooting and root-cause analysis for service reliability.
• Communication: effective communication skills in multicultural, fast-paced environments.
• Language: advanced English proficiency (all communication in English).

Responsibilities

• Design, build and maintain back-end services using C#, ADO.NET and SQL Server.
• Implement and evolve SOAP and REST APIs, ensuring proper versioning, security and best-practice standards.
• Ensure service reliability through unit and integration tests, troubleshooting, monitoring and root-cause analysis.
• Collaborate on integration between multiple systems and services, applying appropriate software design patterns.
• Conduct code reviews, provide technical feedback and mentor junior engineers.
• Stay current with emerging technologies and industry trends, applying them to improve existing solutions.
• Contribute to CI/CD workflows and best practices to increase development efficiency and deployment quality.

Job description

CI&T is seeking a Senior .NET Engineer to drive development and integration of robust back-end software solutions. You will work closely with a multicultural team across Brazil, Colombia, the UK, and the USA, collaborating in English to deliver scalable services.

Join us to design APIs, ensure reliability with testing, mentor junior engineers, and contribute to CI/CD practices while staying current with evolving tech trends.