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[Job-32124] Senior Fullstack .NET Developer

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Summary

Senior Fullstack .NET Developer at CI&T who maintains and evolves a client's .NET Core application ecosystem — including .NET upgrades, AWS infrastructure (RDS, EC2, Fargate, S3), CI/CD, and Angular/Vue frontends — while building AI skills, agents, and automations to boost team productivity. Fluent English is required; mandatory office presence applies to those living in the Campinas metro area, B

Na CI&T , ajudamos grandes empresas a transformar o potencial da AI em impacto real nos negócios com AI Deployment, execução AI-native e tech-integrated business solutions.

Com 30 anos de experiência em transformação tecnológica, aceleramos inovação com expertise em agentic SDLC, application modernization, Data & AI, martech e business strategy.

Somos 8.000 CI&Ters em mais de 25 países, colaborando para construir soluções com impacto real. AI já faz parte da forma como trabalhamos, evoluímos e inovamos todos os dias.

Importante: se você reside na Região Metropolitana de Campinas, sua presença nos escritórios da cidade será obrigatória, conforme a política de frequencia vigente.

We're looking for a Senior Fullstack .NET Developer to maintain and evolve a set of .NET applications. You will be responsible for the entire ecosystem of a specific business line for our client, work closely with the systems/solutions architect, and maintain daily contact with native English-speaking stakeholders.

For this position the candidate must be experienced in leveraging AI on the day-to-day work. It is not only about coding with AI, but creating Skills, Agents, Tooling, etc, that might enhance development workflows and increase the whole team productivity. This will be the most important differentiator among the candidates.

The position has a strong focus on enhancing, modernizing and automating workflows. The candidate must be capable of maintaining CI/CD pipelines, databases, and AWS infrastructure. Experience on migrating to newer .NET Core versions is a huge differential.

The UI of this set of applications are built with Angular and Vue.js, with some Node.js components for backend services.

Responsibilities:
- Maintain and improve existing .NET Core applications.
- Plan and execute .NET Core upgrades and vulnerabilities mitigations.
- Maintain AWS infrastructure: RDS databases, EC2, Fargate, S3, among other services.
- Evolve APIs and work with multiple external/internal integrations.
- Work with containerized applications using Docker.
- Use Bitbucket, CI/CD, and automated tests as part of the delivery workflow.
- Collaborate with stakeholders to discuss and prioritize tasks and clarify requirements.
- Mentor junior developers.
- Improve the team productivity with AI tooling, processes, and automations.

Requirements:
- 5+ years of experience with .NET Core (C#) and web development.
- Proven experience with .NET version migrations/modernizations.
- Strong experience with SQL and PostgreSQL databases.
- Experience with Angular and/or Vue in production environments.
- Experience with AWS services (RDS, EC2, Fargate, S3, etc.).
- Hands-on experience with Node.js for backend services.
- Proficiency with Docker and containerization.
- Experience with relational databases and integrations with third-party APIs.
- Comfortable with Bitbucket/Git and automated testing.
- Fluent English and strong communication/relationship skills.

Nice to Have:
- Experience with Azure cloud platform.
- Knowledge of Strapi CMS.
- React experience.
- Experience with Mailgun or similar email service providers.
- AI Agents Harness.

Nossos benefícios:
- Plano de saúde e odontológico;
- Vale alimentação e refeição;
- Auxílio-creche;
- Licença parental estendida;
- Parceria com academias e profissionais de saúde e bem-estar via Wellhub (Gympass) TotalPass;
- Participação nos Lucros e Resultados (PLR);
- Seguro de Vida;
- Plataforma de aprendizagem contínua (CI&T University);
- Clube de descontos;
- Plataforma online gratuita dedicada à promoção da saúde física, mental e bem-estar;
- Curso gestante e parentalidade responsável;
- Parceria com plataformas de cursos online;
- Plataforma para aprendizagem de idiomas;
- E muitos outros
Mais detalhes sobre os nossos benefícios aqui:
Na CI&T, a inclusão começa no primeiro contato. Se você é pessoa com deficiência, é importante apresentar o seu laudo durante o processo seletivo. Consulte quais dados são necessários conter no laudo clicando aqui. Assim, podemos garantir o suporte e as adaptações que você merece. Se ainda não tem o laudo caracterizador, não se preocupe: podemos te apoiar para obtê-lo.
Temos um time dedicado de Saúde e Bem-estar, especialistas em inclusão e grupos de afinidade que estarão com você em todas as etapas. Conte com a gente para fazer essa jornada lado a lado.

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