MongoDB Tools Team

Team: MongoDB Tools (Product and Engineering)
Location: Remote
Projects: percona/percona-clustersync-mongodb and percona/percona-backup-mongodb
The MongoDB Tools Team builds Percona's open source operational tooling for MongoDB. Two projects sit at the center of what we do. Percona ClusterSync for MongoDB (PCSM) clones and continuously replicates data between clusters. Percona Backup for MongoDB (PBM) is a distributed, low-impact backup and restore solution for replica sets and sharded clusters. This role sits primarily on PCSM, which is younger and moving fast, so you will have real influence over how it takes shape. The two tools share many hard problems: cluster topology, the oplog and change streams, consistency across shards, and performance in very large production clusters. The projects

PCSM (primary focus): initial data cloning followed by continuous change replication over MongoDB Change Streams, for both replica sets and sharded clusters. PBM (secondary): consistent backup and restore with point-in-time recovery,



using oplog capture to stay consistent across replica sets and sharded clusters, with S3-compatible and filesystem storage. Mature and widely deployed in production.
The core replication engine: initial collection cloning followed by continuous change capture over MongoDB Change Streams, with correct handling of resume tokens, ordering, and resumability after failures.
Correctness and fault tolerance at scale: recovering cleanly from network drops, primary elections, and restarts without losing or duplicating changes, and reasoning carefully about the delivery guarantees we can honestly promise.
Namespace filtering and automatic index management, plus the edge cases that show up with DDL, TTL, and index differences between source and target.
Performance and throughput: parallelizing the clone, applying backpressure, and keeping memory and connection use sane against large clusters with great change volume.
Consistent backup, r

📌 Sr. Software Engineer (Madrid)
🏢 Percona
📍 Madrid