Job Summary: We are seeking a Senior Backend Engineer, specialized in APIs and payments, to design and maintain microservices in a cloud-native banking environment. Key Highlights: 1. Key role in microservices and APIs design and development within BaaS. 2. Technical leadership and mentoring of other engineers. 3. Focus on payments, collections, and cash management domains. Sr Backend Engineer\-API \& Payments (AI\-Native) Job Description We are looking for a Senior Backend Engineer specialized in APIs and payments to join a high-end banking environment within a global BaaS platform. The role will focus on designing, developing, and maintaining microservices and APIs within a cloud\-native ecosystem, with emphasis on payments, collections, and cash management domains. Main Responsibilities Design and maintain domain APIs (Payments/Collections). Document REST APIs using OpenAPI 3\.1 and AsyncAPI. **Implement secure authentication and authorization:** OAuth 2\.1, OpenID Connect (OIDC), mTLS, JWT **Develop microservices using:** Java 17\+ (Spring Boot 3\) primary, Python 3\.11\+ (FastAPI) secondary Implement event\-driven workflows with Apache Kafka. Integrate relational databases, caches, and vector DBs. Build CI/CD pipelines using GitHub Actions and ArgoCD. Manage infrastructure as code with Terraform. Implement observability with Datadog, Dynatrace, Prometheus, and ELK. **Ensure regulatory compliance:** PSD2, GDPR, DORA Lead technical decisions and mentor other engineers. Mandatory Requirements 7\+ years of backend and API development experience. Experience in payments or cash management. **Proficiency in:** Java (Spring Boot), Python (FastAPI) **Experience with:** Kafka, PostgreSQL, Redis **Strong security knowledge:** OAuth 2\.1, OIDC, mTLS **Experience with:** Kubernetes, Terraform, GitOps (ArgoCD) **Knowledge of financial regulations:** PSD2, GDPR, DORA Advanced English (mandatory). Desirable Requirements **Experience with:** Vector databases, RAG, LangChain Experience in LLMOps and AI governance. Knowledge of Confluent Platform. Java, Python, TypeScript, Spring Boot, FastAPI API, OpenAPI AsyncAPI, Kafka, Confluent, PostgreSQL, Redis, Vector DB