Senior MongoDB Engineer - Data Migration (Java / Spring Boot)

Location: 100% Remote, USAEngagement: 6-month contract to hire (W2)

Experience: 6-10 years

Work authorization: US Citizen or Green Card holder only

About The Role: This is a MongoDB-first role. Our client, a large US insurance and financial services company, is moving data from relational databases into MongoDB. You will own the MongoDB side: design the document model, migrate the data from the existing databases into MongoDB, and integrate MongoDB with the client's existing Java / Spring Boot backend.

Responsibilities: Design MongoDB collections, document schemas (embed vs reference), indexes and aggregation pipelines. Plan and run data migrations from Oracle, SQL Server, DB2 or PostgreSQL into MongoDB: data mapping, transformation, bulk load, validation, reconciliation and cutover. Integrate MongoDB with the existing Spring Boot services (Spring Data MongoDB / MongoDB Java driver) so the application keeps working during and after the migration. Tune MongoDB performance: explain plans, index strategy, replica sets and sharding. Troubleshoot data and integration issues with architects, developers and business teams. Must haveMongoDB as your primary skill: hands-on schema design, indexing, aggregation and performance tuning in recent projects. At least one real project migrating data from another database into MongoDB.Integrating MongoDB with Java / Spring Boot applications.