Benjamin Gaultier

Full Stack Engineer

LCL Digital Banking · Paris — L by LCL Pro, a neobank for professional clients

• Designed and built the real-time search infrastructure as technical owner: a CDC pipeline aggregating 7 tables across 2 databases into denormalized OpenSearch documents, with dynamic foreign-key resolution and event-ordering guarantees.
• Implemented SEPA transaction recall workflows (SCT-Inst, SDD), routing by flow type and handling refunds and contestations for inbound and outbound payments.
• Built compliance tooling: account blocking with automated client notifications, Verification of Payee for IBANs, and GARO reporting to the Banque de France.
• Integrated Keycloak for agent authentication; turned regulatory requirements into implementations with operations and compliance teams.

• PostgreSQL WAL
• AWS DMS
• Kinesis
• NestJS
• OpenSearch

Backend Engineer

LCL · Paris

• Designed and developed REST APIs in a microservices architecture for banking operations, backed by code reviews and Jest test suites.
• Built and maintained Angular interfaces for back-office banking workflows.
• Managed CI/CD pipelines with Kubernetes and Docker in a regulated environment.

Backend Engineer

Orange · Paris

• Built a REST API layer connecting Google Cloud services to internal front ends, with role-based access control on sensitive resources.
• Automated data labelling in Google Data Catalog through event-driven listeners on file changes.

Full Stack Engineer

French Interior Ministry · Paris

• Built an application that digitized visa and citizenship processing, used by government agents nationwide.
• Developed Python APIs orchestrating data between MongoDB, the Angular front end and external government services.

Backend Engineer

SNCF Réseau · Paris — France's national rail infrastructure operator

• Designed and built a train operations simulation that scaled from 1 to 50+ simultaneous trains, processing up to 600 trains a day.
• Collected, cleaned and analyzed real-world operations data to improve simulation accuracy.
• Built a real-time map of simulation results with Mapbox GL, Django and React.