CI&T

Senior FullStack Developer – .NET, React

CI&T

full-time

Posted on:

Location Type: Hybrid

Location: Campinas • Brazil

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Job Level

Senior

Tech Stack

Azure.NETPythonReactRPASQLTypeScript

About the role

  • Lead the migration of core trading functions from a legacy application to ION’s Carbon Zero platform, focusing on automating receipt processing across approximately 40 global registries.
  • Build and maintain the Callisto UI using React and TypeScript, and implement robust back-end business logic and APIs in C#/.NET Core or Python.
  • Develop and support integrations with external EAC (Environmental Attribute Certificates) tracking systems via APIs or AI-enabled RPA solutions.
  • Actively use AI-assisted coding tools (e.g., Cursor, Claude Code, GitHub Copilot) to accelerate development and uphold high code quality.
  • Collaborate with US-based technical leads and business stakeholders to map integration touchpoints across Salesforce, NetSuite, and our operational databases.

Requirements

  • 8+ years of experience in C#/.NET/Python development and React/TypeScript frontend engineering.
  • Advanced database skills (Azure SQL, Managed Instances) with the ability to analyze and optimize complex schemas.
  • Professional-level English proficiency (C1+) with the ability to communicate complex technical decisions to US-based stakeholders.
  • A product mindset with proven ability to move from prototype to production within 6–8 week cycles.
  • Availability to maintain significant overlap (at least 6 hours) with US Pacific Time (PT) working hours.
  • Demonstrated experience using AI tools (LLMs, agentic frameworks) to accelerate your personal development workflow.
Benefits
  • Health and dental insurance
  • Meal and grocery/food allowances
  • Childcare assistance
  • Extended parental leave
  • Partnerships with gyms and health & wellness professionals via Wellhub (Gympass/TotalPass)
  • Profit Sharing (PLR)
  • Life insurance
  • Continuous learning platform (CI&T University)
  • Employee discount club
  • Free online platform for physical and mental health and well-being
  • Pregnancy and responsible parenthood course
  • Partnerships with online course platforms
  • Language learning platform
  • And many more
Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools
C#.NET CorePythonReactTypeScriptAzure SQLAPIsRPAdatabase optimizationbusiness logic
Soft Skills
communicationcollaborationproduct mindsettechnical decision-makingadaptability