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Backend Engineer Authentication

CloudWalk - São Paulo

Posted May 7, 2026

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About this role

Backend Engineer Authentication São Paulo 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

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