[Job - 31975] Senior .NET Developer, Colombia

Ciandt; Colombia; On-site; COP 133,920,000 - 267,840,000; 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

And many others

Job summary

CI&T is seeking a Senior .NET Engineer to design, build and maintain robust back-end services using C#, ADO.NET and SQL Server. You will implement SOAP/REST APIs, ensure reliability with tests, and collaborate across distributed teams in English.

The role emphasizes mentoring, maintaining high engineering standards, and contributing to CI/CD practices for better deployment quality.

Qualifications

• Must have strong .NET experience in production systems.
• Backend services development with C#, ADO.NET, SQL Server.
• Experience designing and evolving SOAP/REST APIs with versioning.
• Solid understanding of SQL Server, database design and performance tuning.
• XML serialization/deserialization proficiency.
• Knowledge of software design patterns and best practices.
• Experience with unit and integration testing for reliability.
• Effective communication in multicultural, fast-paced environments.
• Advanced English proficiency; all communication in English.

Responsibilities

• Design, build and maintain back-end services with C#, ADO.NET and SQL Server.
• Implement and evolve SOAP and REST APIs with proper versioning and security.
• Ensure service reliability via unit and integration tests and root-cause analysis.
• Collaborate on integration across systems using design patterns.
• Conduct code reviews and mentor junior engineers.
• Stay updated with emerging tech and apply to solutions.
• Contribute to CI/CD practices to improve deployment quality.

Skills

.NET

Backend

APIs

Data persistence

XML

Software design

Testing

Communication

English

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 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.

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:

• - Premium Healthcare
• - Meal voucher
• - 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.