Principal Security Software Engineer (Digital Banking)

MONEY FORWARD VIETNAM CO.,LTD

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A sneak peak of members in Ha Noi office

Tòa nhà E.Town Central, Số 11 Đoàn Văn Bơ, Xom Chieu, Ho Chi Minh

Hybrid

Posted 1 hour ago

Skills:

Kotlin English OWASP PostgreSql Redis Java

Job Expertise:

Software/Technical Architect

Job Domain:

Banking

Top 3 reasons to join us

Hybrid working; Flexible time; Macbook Pro
L&D programs; 17 days off
13.7 million B2C users; 140,000+ business customer

Job description

About the Role

We're building the Authentication & Authorization platform for a new FSA-regulated digital bank in Japan. The platform powers OAuth 2.0/OIDC-based login, token lifecycle, and identity management across four banking channels — officer dashboards, customer-facing apps, BaaS APIs, and third-party service provider integrations.

The team is located in Vietnam HCM city with high ownership. You'll own entire auth flows end-to-end — not just write tickets.

What You'll Build

Token lifecycle — DPoP-bound access tokens, token exchange (RFC 8693), silent refresh, session management
Passkey/FIDO2 — WebAuthn registration & login flows, step-up authentication for sensitive operations
mTLS integrations — certificate-based service-to-service auth with external financial platforms
Shared security library — Spring Boot starter providing standardized auth filters across all backend services
Integration testing — Karate-based test suites covering all auth flows at scale
Monitoring — Auth event observability, anomaly detection, audit trail completeness

Your skills and experience

Must-Have

Backend

Over 10 years in server-side engineering, including 5 to 7 years specializing in Kotlin or Java with Spring Boot development.
Redis — session management, distributed locking, caching
PostgreSQL — schema design, migrations
REST API design and HTTP security headers
English proficiency (reading, writing, and verbal) — the primary working language across the team and organization for daily communication, code reviews, and technical documentation.

Security & Auth

Strong Spring Security expertise — filter chains, OAuth2 Resource Server
Working knowledge of OAuth 2.0 / OIDC — authorization code, client credentials, token exchange, introspection
Understanding at least one: DPoP (RFC 9449), mTLS (RFC 8705), PKCE, FIDO2/WebAuthn
Familiarity with JWT structure — claims, JWKS, key rotation
Strong knowledge of authentication, authorization, session management, and secure web application development.
Strong understanding of the OWASP Top 10 — common web vulnerabilities, mitigation, and secure coding practices

Infrastructure

AWS — ECS/Fargate, Secrets Manager, VPC basics
Terraform or similar IaC
API integration testing (Karate preferred)

Nice-to-Have

Experience with Authlete
FAPI 2.0 Security Profile or financial-grade API standards
Microsoft Entra ID — SAML/OIDC federation, FIDO2 key enforcement
Cloudflare/ Akamia — mTLS termination, WAF, client certificate forwarding
WebAuthn/FIDO2 ceremonies — attestation, assertion, discoverable credentials
Fintech/banking background — FSA regulations, maker-checker patterns, audit logging
Japanese language ability (reading/basic communication) — a plus for requirement docs

Why This Role

🏦 Real regulated bank — not a fintech startup, not a toy project. FSA-supervised, launching in Japan.
🔐 Cutting-edge security standards — FAPI 2.0, DPoP, WebAuthn/FIDO2. Few teams globally work at this intersection.
🚀 High ownership — small team, big scope. You'll own entire authentication channels, not just implement tickets.
🌏 Global collaboration — work with engineers across Japan, Vietnam, and India on a greenfield digital banking platform.