.NET Developer Senior, Colombia

CI&T; Colombia; On-site; COP 110,000,000 - 170,000,000; Full time

Benefits offered by this job

Maternity and Parental leaves

Mobile services subsidy

Life insurance

CI&T University

Colombian Holidays

Paid Vacations

Job summary

CI&T is hiring a Senior .NET Engineer to join a multicultural team spanning Brazil, Colombia, the UK, and the USA. You will design, build, and maintain backend services with C#, ADO.NET, and SQL Server, and craft SOAP and REST APIs. All communication is in English.

You will own API design, implement CI/CD workflows, review code, and mentor juniors while driving performance improvements and system integration in a fast-paced environment.

Qualifications

• Strong experience with .NET Framework and .NET Core in production systems.
• Deep knowledge of ADO.NET and SQL Server.
• Experience with database design and performance optimization.
• Hands-on experience building SOAP and REST APIs.
• Ability to work with XML data.
• Strong understanding of software design patterns and best practices.
• Advanced English proficiency.
• Ability to work well in multicultural, fast-paced teams.

Responsibilities

• Design, build, and maintain back-end services using C#, ADO.NET, and SQL Server.
• Create and improve SOAP and REST APIs following best practices and version standards.
• Write unit tests and integration tests to ensure services work correctly.
• Find and fix problems in the code (root-cause analysis).
• Help integrate different systems and services using design patterns.
• Review other developers’ code and provide guidance to junior team members.
• Learn about new technologies and find ways to improve current solutions.
• Work on CI/CD workflows (automated testing and deployment) to improve team processes.

Job description

At CIñ, 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 hiring a Senior .NET Engineer to join our team and help build complex back-end software solutions. You will work with a multicultural team spread across Brazil, Colombia, the UK, and the USA. All communication will be in English.

What You Will Do

• Design, build, and maintain back-end services using C#, ADO.NET, and SQL Server
• Create and improve SOAP and REST APIs (following best practices and version standards)
• Write unit tests and integration tests to make sure services work correctly
• Find and fix problems in the code (root-cause analysis)
• Help integrate different systems and services together (using software design patterns)
• Review other developers’ code and provide guidance to junior team members
• Learn about new technologies and find ways to improve our current solutions
• Work on CI/CD workflows (automated testing and deployment) to improve how the team works

What You Need to Know

• Strong experience with .NET Framework and .NET Core in real production systems
• Deep knowledge of ADO.NET and SQL Server
• Experience with database design and making databases work faster
• Hands-on experience building SOAP and REST APIs
• Ability to work with XML (reading and writing XML data)
• Strong understanding of software design patterns and best practices
• Advanced English proficiency
• Ability to work well in multicultural, fast-paced teams

Soft Skills

• Takes ownership of your work and always looks for ways to improve
• Communicates clearly with both technical and non-technical people
• Works well with others and values the team’s success
• Can adapt when requirements change or situations are unclear

Nice to Have

• Experience with cloud platforms (preferably Azure)
• Knowledge of specification-driven development (building code based on clear requirements)
• Understanding of modern software development approaches

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.