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Backend Engineer Authentication at CloudWalk. Location Information: Brazil. What You'll Do:. This role sits on a team that owns both auth and ledger, so you'll occasionally pick up work across both areas.   - Develop and maintain authentication systems used by both customers and internal services   - Build and operate token issuance, validation, and rotation   - Maintain HSM-backed key management and signing infrastructure   - Improve the security of auth flows in a regulated financial environment   - Build SDKs and tooling that other engineering teams use to integrate with auth   - Communicate clearly with both technical and non-technical stakeholders. Who You Are:.   - Has operated critical infrastructure on cloud providers like GCP or AWS, using tools such as Terraform   - Has experience with cryptographic authentication systems   - Has experience with authentication and authorization protocols (OAuth/OIDC, JWT, SAML)   - Has experience with PCI compliant systems   - Is proficient in Rust   - Some knowledge of the Brazilian payments ecosystem is a plus   - Experience with HSMs is a plus   - Communicates clearly and effectively   - Advanced English communication skills, primarily for internal communication with our diverse, multinational team. Why Join CloudWalk? Work at one of the world's most innovative and fastest-growing fintechs; Collaborate with a diverse team of hackers, artists, and visionaries; Explore the power of AI to amplify your impact as an engineer; Build solutions that touch millions of lives every day. The Future We See:   At CloudWalk, we envision a future where AI empowers every field to reach new heights: • People teams leveraging AI to transform talent acquisition and employee development. • Marketing professionals creating data-driven, AI-powered campaign strategies. • Customer Success teams enhancing client experiences with intelligent solutions. • Risk analysts combining human expertise with AI to navigate complexities. • Designers collaborating with AI to push creative boundaries.     Join us at CloudWalk, where we're not just engineering solutions; we're building a smarter, AI-driven future for payments—together.