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CI&T

Mid-Level .NET Developer

CI&T

. Maintain and improve existing ASP.NET and .NET Core web applications .

Posted 11/3/2026full-timeRemote • BrazilMid-LevelSeniorWebsite

Core Competencies

Role fit
Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates extensive experience in .NET (C#) web development, including maintaining and upgrading applications, implementing authentication systems, and integrating third-party APIs. Proficient in collaborating with stakeholders and utilizing AWS, relational databases, and automated testing tools to deliver high-quality software solutions.

Highest-signal resume keywords
5+ Years .NET (C#) ExperienceAuthentication And Authorization SystemsAWS And Relational DatabasesAutomated Testing With PlaywrightReact In Production Applications

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills
.NET CoreASP.NETOAuth2OIDCJWTMySQLPostgreSQLCI/CD PipelinesBitbucketAutomated Testing
Soft Skills
Strong Communication SkillsStakeholder Collaboration
Tools & Technologies
AWSBitbucketPlaywrightVersion Control
Industry Keywords
Web ApplicationsThird-Party API IntegrationsSecurity Systems

Tech Stack

Tools & technologies
ASP.NETAWSMySQLPostgresReact.NET

About the role

Key responsibilities & impact
  • Maintain and improve existing ASP.NET and .NET Core web applications
  • Design and build modern login and security systems using OAuth2, OIDC, JWT, and identity providers
  • Plan and execute upgrades to newer .NET Core versions
  • Work with AWS, MySQL, PostgreSQL, and external services
  • Use Bitbucket and automated testing tools, including Playwright, to deliver quality code
  • Work with CI/CD pipelines to automate testing and deployment
  • Communicate in English with stakeholders to discuss priorities and understand requirements
  • Talk directly with stakeholders to understand needs and help prioritize tasks
  • Collaborate with a team to deliver and improve web applications

Requirements

What you’ll need
  • 5+ years of professional experience with .NET (C#) and web development
  • Proven experience with authentication and authorization systems
  • Proven experience with upgrading .NET versions
  • Experience with React in production applications
  • Experience with AWS and relational databases (MySQL, PostgreSQL)
  • Experience with third-party API integrations
  • Comfortable with Bitbucket/Git and version control
  • Experience with automated testing; Playwright is a plus
  • Advanced English proficiency
  • Strong communication skills

Benefits

Comp & perks
  • Health and dental insurance
  • Meal and food allowance
  • Childcare assistance
  • Extended paternity leave
  • Partnership with gyms and health and wellness professionals via Wellhub (Gympass) TotalPass
  • Profit Sharing and Results Participation (PLR)
  • Life insurance
  • Continuous learning platform (CI&T University)
  • Discount club
  • Free online platform dedicated to physical, mental, and overall well-being
  • Pregnancy and responsible parenting course
  • Partnerships with online learning platforms
  • Language learning platform
  • Inclusion support and workplace accommodations for people with disabilities
  • Dedicated Health and Well-being team, inclusion specialists, and affinity groups