Senior .NET Engineer: Build Scalable APIs & Back-End

OpenKrill; United States; Remote; USD 110,000 - 150,000; Full time

Benefits offered by this job

Health and dental insurance

Meal and food allowance

Childcare assistance

Wellbeing program

Life insurance

Continual learning platform

Job summary

CI&T in the United States is seeking a Senior .NET Engineer to design, build, and maintain robust back-end services. You will collaborate with a multicultural team across the USA, Brazil, Colombia, and the UK, with all communication in English.

You will implement SOAP and REST APIs, contribute to CI/CD workflows, and mentor junior developers while adopting new technologies and best practices. This role offers opportunities to influence architectural decisions and deliver scalable enterprise

Qualifications

• Strong experience with .NET Framework and .NET Core in production systems.
• Deep knowledge of ADO.NET and SQL Server.
• Experience designing databases and making them faster.
• Hands-on experience building SOAP and REST APIs.
• Ability to work with XML data.
• Strong understanding of design patterns.
• Advanced English proficiency.
• Thrives in multicultural, fast-paced teams.

Responsibilities

• Design, build, and maintain back-end services using C#, ADO.NET, and SQL Server.
• Create SOAP and REST APIs following best practices.
• Write unit and integration tests to ensure reliability.
• Review code and mentor junior developers.
• Improve CI/CD workflows for automated testing and deployment.

Skills

.NET Framework

.NET Core

ADO.NET

SQL Server

SOAP APIs

REST APIs

Unit testing

XML data

Design patterns

English

Multicultural teams

Job description

CI&T in the United States is seeking a Senior .NET Engineer to design, build, and maintain robust back-end services. You will collaborate with a multicultural team across the USA, Brazil, Colombia, and the UK, with all communication in English.

You will implement SOAP and REST APIs, contribute to CI/CD workflows, and mentor junior developers while adopting new technologies and best practices. This role offers opportunities to influence architectural decisions and deliver scalable enterprise