Senior Software Engineer II, Enterprise Fulfillment

Instacart • San Francisco, CA

9d • Remote

About The Position

As a Senior Software Engineer, you will focus on executing and delivering high‑impact platform capabilities across Instacart’s Enterprise Fulfillment Platform APIs and services. You will work on complex areas such as API design, fulfillment orchestration, retailer and partner integrations, and high‑throughput distributed systems. You will contribute to building the next generation of Instacart’s fulfillment technology, ensuring reliability, scalability, and partner success. In this role, you will also provide technical leadership, mentoring teammates and raising engineering quality without formal management responsibilities.
This role sits within the Enterprise Platform team, part of the broader Fulfillment organization. The team builds and operates the foundational systems that power Connect API Fulfillment and Instacart’s 3rd‑Party Fulfillment Platform. These systems enable retailers, partners, and external providers to integrate fulfillment experiences directly into their own environments. The team’s mission includes ensuring platform reliability, expanding partner capabilities, driving adoption of our fulfillment services, and contributing to the company’s Gross Transaction Value (GTV) growth by powering next‑generation fulfillment orchestration.

Requirements

• Bachelor’s or Master’s degree in Computer Science (or related field), or equivalent experience.
• 5+ years of backend development experience, with a strong record of project delivery.
• Experience drafting clear technical vision and design documents.
• Strong proficiency in owning and maintaining production services at high quality.
• Ability to rapidly deliver high‑quality code supporting high‑traffic systems.
• Experience working with product teams or customers in a collaborative environment.
• Proven ability to influence and mentor a team as a senior IC.

Nice To Haves

• Experience designing or scaling external APIs.
• Experience with distributed systems or orchestration‑style architectures.
• Experience integrating with external partners or 3rd‑party systems.
• Experience working across teams to develop platform‑level solutions.
• Track record of generating innovative, forward‑looking technical ideas.

Responsibilities

• Build core platform components that power Connect API Fulfillment and the 3rd‑Party Fulfillment Platform.
• Deliver reliable, scalable APIs and orchestration systems that support complex, high‑volume fulfillment workflows.
• Drive execution of major platform initiatives, from architecture to implementation to launch.
• Collaborate with product and cross‑functional partners when needed to align on requirements and integration needs.
• Improve platform reliability, throughput, and developer experience.
• Contribute to the design of next‑generation fulfillment orchestration and partner‑facing APIs and tooling.
• Mentor engineers through technical guidance, code reviews, and thought leadership.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level