Senior .NET Backend Engineer: Scalable APIs & Services

CI&T; United States; Remote; USD 110,000 - 160,000; Full time

Benefits offered by this job

Premium Healthcare

Meal voucher

Maternity and Parental leaves

Mobile services subsidy

Sick pay-Life insurance

CI&T University

Colombian Holidays

Paid Vacations

Job summary

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

The successful candidate will design, build and maintain back-end services using C#, ADO.NET and SQL Server, implement SOAP and REST APIs with versioning and

Qualifications

• Must have strong experience with .NET Framework and .NET Core in production systems.
• Hands-on back-end development experience with C#, ADO.NET and SQL Server.
• Solid experience implementing SOAP and RESTful services with versioning and best practices.
• Strong understanding of ADO.NET, SQL Server, database design and performance tuning.
• Proficiency in XML serialization/deserialization.
• Solid grasp of software design patterns and engineering best practices.
• Experience with unit and integration testing, troubleshooting and root-cause analysis for service reliability.
• Effective communication skills in multicultural, fast-paced environments.
• 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 with proper versioning, security and best practices.
• Ensure service reliability through unit and integration tests, troubleshooting and root-cause analysis.
• Collaborate on integration between multiple systems and services, applying design patterns.
• Conduct code reviews, provide technical feedback and mentor junior engineers.
• Stay current with emerging technologies and industry trends to improve solutions.
• Contribute to CI/CD workflows and best practices to improve development efficiency and deployment quality.

Skills

.NET experience

Backend development

APIs & integration

Data & persistence

XML

Software design

Testing & reliability

Communication

English proficiency

Job description

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

The successful candidate will design, build and maintain back-end services using C#, ADO.NET and SQL Server, implement SOAP and REST APIs with versioning and