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CI&T

Tech Lead – Full-Stack

CI&T

. Build and evolve the Authentication & Authorization (OAuth 2.0) and observability modules .

Posted 10/5/2026full-timeBrazilSeniorWebsite

Core Competencies

Role fit
Core Competencies

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Demonstrates expertise in full-stack development with a focus on authentication and authorization systems, integrating identity providers, and maintaining observability metrics. Proficient in managing legacy and modern codebases while ensuring seamless user experiences across multi-tenant environments.

Highest-signal resume keywords
Full-Stack DevelopmentOAuth 2.0React + TypeScriptIdentity Providers IntegrationObservability Tools

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Applicant Tracking System Keywords

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Hard Skills
Node.jsJavaKotlinKafkaDockerAWSAzureGitCI/CD PipelinesKubernetes
Tools & Technologies
Auth0KeycloakOktaEntra IDAzure B2CSigNozPrometheusGrafana
Industry Keywords
RBACOIDCMulti-Tenant ModelSeparation of DutiesOpenFGAAnti-Corruption LayerFactory Integration PatternStrategy Integration Pattern

Tech Stack

Tools & technologies
AWSAzureCloudDockerGrafanaJavaJavaScriptKafkaKotlinKubernetesNext.jsNode.jsPrometheusReactTypeScript

About the role

Key responsibilities & impact
  • Build and evolve the Authentication & Authorization (OAuth 2.0) and observability modules
  • Integrate the modules with the platform’s central portal/IdP
  • Develop and evolve the central login mechanism, product-level role declarations, and support for enterprise connections in a multi-tenant model
  • Maintain and support existing authentication flows and services, ensuring compatibility with clients that have not yet been migrated
  • Maintain and support the current Flow user and role management services, including the User API and Global Settings
  • Integrate users and roles from the new provider, such as Keycloak or Auth0, with Flow Lite services
  • Synchronize and migrate identity data between the new and current models
  • Instrument observability metrics, logs, and dashboards
  • Evaluate and prototype integrations with Auth0, Keycloak, Okta, Entra ID, and Azure B2C
  • Work with the Infra Tools squad to integrate the modules with the central portal/IdP
  • Participate in discovery and technical refinement of the platform’s upcoming enhancements
  • Document technical decisions and keep the modules aligned with Flow’s shared ownership model

Requirements

What you’ll need
  • Strong full-stack development experience: frontend (React + TypeScript, Next.js) and backend (Node.js, Java, or Kotlin)
  • Familiarity with using AI tools, such as Claude Code, skills, and custom agents, for technical refinement, documentation, new features, and coding
  • Practical knowledge of authentication and authorization: OAuth 2.0, OIDC, and RBAC
  • Experience with identity providers such as Auth0, Keycloak, Okta, Entra ID, or Azure B2C
  • Experience with messaging services, such as Kafka or an equivalent, for producing and consuming events
  • Comfortable working with codebases containing both legacy and newer versions, carrying out gradual migrations without disrupting legacy clients
  • Familiarity with observability tools such as SigNoz and Prometheus/Grafana
  • Experience with at least one public cloud provider: AWS or Azure
  • Experience with Docker
  • Git and CI/CD pipelines, such as GitHub Actions
  • Knowledge of SoD (Separation of Duties) and/or OpenFGA is a plus
  • Experience with Kubernetes and GitOps concepts is a plus
  • Knowledge of the Anti-Corruption Layer and Factory/Strategy integration patterns is a plus

Benefits

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