Instacart is seeking a Senior Software Engineer II for its Commerce Platform team to design and build scalable, low-latency backend services that power key aspects of the shopping experience. The role involves collaborating across teams to develop core platform capabilities and improve system reliability and performance. Candidates should have strong programming skills in languages such as Java or Scala, experience with distributed systems, and a passion for building robust software. This position is full-time and based in San Francisco, CA.