Senior Software Engineer, Capacity & Efficiency at Robinhood · LumiJobs

Responsibilities

Build forecast-driven capacity planning for the storage and database fleet, turning traffic history, load tests, and known events (market open, earnings, IPOs, promotions) into plans that scale up ahead and back down after, with an expiry on every temporary capacity hold
Design and build a capacity planner for Aurora that sets reader counts and writer instance sizes from demand and load signals (IOPS, CPU, connections, replica lag), replacing fixed scaling schedules
Rightsize databases, caches, and block storage (RDS, ElastiCache, DynamoDB, EBS) on instance size, provisioned IOPS and throughput, and idle capacity, and keep them right-sized as load changes
Own S3 efficiency at scale: storage class and Intelligent-Tiering strategy, lifecycle and retention policies, noncurrent versions and incomplete uploads, and request costs, using Storage Lens and inventory data
Take every recommendation to closed-loop automation with guardrails, progressive rollout, and rollback, in partnership with the Storage infrastructure team, handling constraints such as AWS capacity shortages, fallback instance types, and connection pooling
Measure outcomes in cost and reliability (savings against baseline, forecast error, utilization, capacity left behind after events) and share our forecasts with the pod rightsizing system so compute and storage scale together
Deep hands-on experience operating AWS storage and databases at scale, especially Aurora or RDS (MySQL or PostgreSQL) and S3, including replication, read scaling, storage classes, and lifecycle management
Capacity planning and forecasting experience: modeling time-series demand, load testing, and translating traffic into instance counts, sizes, and storage growth
A track record of rightsizing infrastructure from utilization data (CPU, memory, IOPS, throughput, bytes stored) without hurting latency or availability
Strong Python or Go engineering, with experience building automation that safely modifies production infrastructure (guardrails, progressive rollout, and rollback built in), not just systems that observe and report
Familiarity with AWS storage and database pricing (S3 storage classes and requests, Aurora I/O-Optimized vs. Standard, Reserved Instances) is a strong plus
Experience with bursty, event-driven workloads (trading, payments, ticketing) or with Spark, Airflow, or Kubernetes is a plus

Senior Software Engineer, Capacity & Efficiency

Responsibilities

Benefits

Company

Robinhood

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