Performance Engineer

Siri InfoSolutions Inc; Austin (TX); On-site; USD 90,000 - 140,000; Full time

Job summary

Siri InfoSolutions Inc in Austin, TX and Sunnyvale, CA is seeking a Performance Engineer for a 6+ month contract to optimize run times in large MongoDB deployments.

The role emphasizes tuning queries, designing shard keys, and leveraging WiredTiger and replication strategies to sustain performance at scale.

Qualifications

• Expert in MongoDB with deep knowledge of data modeling and queries.
• Proven ability to tune performance across large data sets and clusters.
• Fluent with aggregation framework to build pipelines and optimize queries.
• Experience designing effective indexing strategies for complex workloads.
• Knowledge of read/write/read-concern semantics and their impact on consistency.
• Strong ability to explain plans and use profiler insights to optimize queries.
• Experience with WiredTiger internals: cache, eviction, and checkpoints.
• Experience with replication and scale-out/sharding considerations.
• Design shading/sharding strategies; plans reshading and zone strategy.
• Scripting for automation in Python

Skills

MongoDB

Performance tuning

Aggregation framework

Indexing strategy

Read-concern semantics

Explain plan

Profiler optimization

WiredTiger internals

Replication at scale

Sharding strategy

Job description

Role: Performance Engineer

Location: Austin, TX/Sunnyvale, CA

Duration: 6+ Months

Must Have Skills:

• 1. Expert in MongoDB
• 2. Strong experience in Performance tuning
• 3. Fluent in the aggregation framework, indexing strategy, and read/write/read-concern semantics.
• 4. Strong explain-plan and profiler-driven query optimization
• 5. WiredTiger internals: cache, eviction, checkpoints, journal, compression, document-level concurrency.
• 6. Replication and shading operations at scale, including shard-key design trade-offs.
• 7. Scripting for automation Python
• 8. Strong experience with tuning of specific clusters, queries, indexes and schemas
• 9. Good experience designing shading strategy and shard keys; plans reshading and zone strategy
• 10. Strong experience operating and monitoring existing sharded clusters; runs balancer, fixes hot chunks