Sr Full Stack Engineer (Javascript / React / C#) (México)
Open to LATAM candidates | Remote
Overview
We are seeking a highly skilled Senior Full Stack Engineer (JavaScript / React / C#) with strong experience in modern web technologies and backend development. The idóneo candidate is an autonomous problem-solver who can take ownership of complex challenges, contribute to scalable architecture, and mentor other engineers within the team.
Key Responsibilities
Design, develop, and maintain scalable web applications using JavaScript, React, and C#
Build and integrate APIs, ensuring high performance and reliability across services
Implement Backend-for-Frontend (BFF) patterns to optimize frontend-backend communication
Develop responsive and user-friendly interfaces aligned with modern design standards
Troubleshoot and debug complex technical issues independently
Collaborate with cross-functional teams to define and deliver technical solutions
Lead technical initiatives and provide mentorship to junior and mid-level engineers
Contribute to architectural decisions and best practices across the engineering team
Required Qualifications
Strong proficiency in JavaScript, React, C#, and SQL
Hands‐on experience with API integrations and distributed systems
Proven ability to work autonomously and solve complex problems without supervision
Experience implementing BFF (Backend-for-Frontend) architecture
Solid understanding of responsive design principles
Demonstrated experience leading or mentoring technical teams
Experience with JWT‐Secured Authorization Requests (JAR), JWK key management, and token lifecycle management
Strong understanding of claims‐based identity, token validation, and secure redirect URI handling
Experience in secure credential management (Azure Key Vault, Cosmos DB secrets storage)
Experience with external IdP integrations where your platform acts as a Service Provider (SP)
Nice to Have
Experience with GraphQL
Familiarity with Microsoft Azure cloud services
Experience integrating or working with SOAP/ASP‐based systems
Understanding of design and implementation of Identity Provider (IdP) solution
Understanding of Duende IdentityServer (or similar: IdentityServer4, Auth0, Okta) in production environments
Knowledge of OAuth 2.0 flows (authorization code, client credentials, PKCE) and OpenID Connect (OIDC)
Understanding of how to implement SAML 2.0 SSO integrations, including signature verification and assertion processing
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