[Job - 31975] .NET Developer Senior, Colombia

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 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.

As a Senior .NET Engineer, you will design solutions, help guide less experienced developers, and help the team adopt new technologies and best practices.

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)

- Exposure to Agile development methods

- Understanding of modern software development approaches

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