Mid-Level .NET Developer, Colombia

CI&T; Colombia; On-site; COP 70,000,000 - 110,000,000; Full time

Benefits offered by this job

Maternity Leave

Mobile Services Subsidy

Life Insurance

CI&T University

Colombian Holidays

Paid Vacations

Job summary

CI&T, a global technology consultancy, is seeking a Mid-Level .NET Engineer to design, build and maintain robust back-end services. You will work with a multicultural team across Brazil, Colombia, the UK, and the USA, coding in C#, .NET Core, and SQL Server, with English as the daily language.

You will implement SOAP/REST APIs, perform tests, contribute to CI/CD, and mentor junior engineers while staying current with evolving patterns and best practices.

Qualifications

• Strong experience with .NET Framework and .NET Core in production systems.
• Hands-on backend development using C#, ADO.NET, and SQL Server.
• 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 software design patterns and engineering best practices.
• Experience with unit and integration testing, troubleshooting and root-cause analysis.
• Effective communication in multicultural, fast-paced environments.
• Advanced English proficiency (all communications 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

Skills

.NET

Backend Development

APIs & Integration

Data & Persistence

XML

Software Design

Testing & Reliability

Communication

English Proficiency

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 looking for a Mid-Level .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.

Must-Have Skills:

• .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).

Key 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

Soft Skills

• Ownership & Continuous Improvement: proactive in taking responsibility for tasks and driving improvements
• Communication: able to clearly explain complex technical topics to both technical and non-technical audiences
• Collaboration: team player who values shared success and cross-functional collaboration
• Adaptability: comfortable navigating ambiguity and shifting requirements in a dynamic environment

Nice-to-Have Skills

• Cloud: experience with cloud platforms, preferably Microsoft Azure
• Modern Practices: familiarity with specification-driven development and agentic approaches to software development
• Agile: exposure to Agile methodologies (Scrum, Kanban, etc.)

The successful candidate will deliver reliable, performant back-end services and integrations, help elevate engineering standards through reviews and mentorship, and collaborate smoothly across time zones and cultures using English as the primary language.

Our benefits include:

• Maternity and Parental leaves
• Mobile services subsidy
• Sick pay-Life insurance
• CI&T University
• Colombian Holidays
• Paid Vacations

And many others.

Collaboration is our superpower, diversity unites us, and excellence is our standard.

We value diverse identities and life experiences, fostering a diverse, inclusive, and safe work environment. We encourage applications from diverse and underrepresented groups to our job positions.