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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