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Senior Backend Engineer (Identity & Access Management) - Go, OAuth 2.0, OpenID Connect

Andersen Lab • Spain
Remote
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Lead the design and development of scalable, high-performance identity services for a global financial protection platform. Focus on OAuth 2.0, OpenID Connect, and secure authentication protocols while mentoring engineers and driving security best practices. Requires 7+ years of backend experience, 5+ years in Go, and deep expertise in distributed systems and IAM.

Key Highlights
Build and scale distributed identity services (SSO, MFA, token management) in Go for a high-growth financial platform
Own end-to-end development, security reviews, and mentorship for authentication/authorization systems
Work with global clients in FinTech, Healthcare, and Telecom sectors with flexible remote/hybrid options
Key Responsibilities
Design, develop, and operate high-throughput, low-latency identity services (SSO, MFA, session management, federation)
Implement and scale OAuth 2.0, OpenID Connect, JWTs, and secure token strategies (issuance, rotation, revocation)
Write concurrent, performant Go services with idiomatic, testable code and clear API contracts (gRPC/HTTP)
Deploy and manage identity infrastructure using CI/CD, monitoring, and incident response
Serve as SME for authentication/security, conduct threat modeling, and guide cross-team integrations
Integrate with identity providers (Keycloak, AWS Cognito) and maintain federated identity solutions
Mentor engineers, conduct design reviews, and contribute to the team’s technical roadmap and security posture
Technical Skills Required
Go (Golang) OAuth 2.0 / OpenID Connect Distributed Systems & gRPC
Benefits & Perks
Fully remote or hybrid work options
Up to 1,000 EUR/month bonus (included in annual bonus)
Corporate training portal with continuous knowledge updates
Private health insurance and sports compensation
Certification reimbursement (AWS, PMP, etc.)
Nice to Have
SAML, SCIM, PKI, JWKs/JWKS endpoints, key management (KMS/HSM)
Rate limiting, abuse mitigation, and adaptive authentication
Commercial/open-source identity platform experience

Job Description

Andersen is hiring a Senior Backend Engineer (Identity & Access Management) for a project building a scalable distributed platform and delivering reliable backend solutions.

Our customer is an international organization operating in the financial and protection services domain. The company provides a diverse portfolio of customer-oriented solutions across multiple business areas and markets. With a strong focus on digital capabilities, operational excellence, and long-term development, the organization continuously invests in technology, process improvement, and service innovation to support evolving customer and business needs.

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