Senior Software Engineer II

About The Role

We are looking for an exceptional Senior Software Engineer II to join the Extend Fulfillments team, a core pillar driving our company's growth and customer satisfaction. This role offers a unique opportunity to build impactful software used by some of the largest ECommerce and Brick and Mortar merchants in the industry, and directly influencing how our merchants make their customers whole.

What You'll Do

• Tackle ambiguous, cross-system problems spanning all aspects of fulfillment and servicing
• Own large features end to end, from design through deployment, release, and monitoring
• Deliver scalable, event-driven, AI-native applications that elevate the customer experience
• Collaborate with platform teams to enhance overall system architecture
• Own the design, implementation, quality and safety of AI/agentic features in production systems
• Mentor other engineers across levels through code review, pairing, design collaboration and coaching
• Drive adoption of tooling and practices, including AI developer tooling, and codify the habits that make them effective
• Advocate for the proactive investments — refactors, observability, upgrades, technology adoption — that enable continuous improvement
• Communicate fluently across product, design, solutions, and ops to align outcomes with business goals

What We're Looking For

• 8+ years of full-stack experience
• Proven track record building distributed, cloud-native applications, with hands-on serverless experience
• Demonstrated experience shipping AI/LLM features to production
• Strong instincts for API design and backwards compatibility — especially where events drive money movement or fulfillment
• A track record of owning large, ambiguous, cross-system initiatives end to end
• Proven ability to influence beyond your team — aligning groups, distilling complex ideas for leadership, and pushing back with data
• A pattern of mentoring across levels and driving team-wide improvements that outlast any single project
• Strong data modeling and context engineering skills that ensure application quality and sound agentic decisioning
• Fluency with advanced AI developer tooling, a track record of using it to ship more, and a habit of bringing teammates along
• Expert in TypeScript, Node.js, and React

Estimated Pay Range

The estimated pay range for this position is $171,000 - $198,000 per year salaried.

Lifestyle at Extend

• Working with a great team from diverse backgrounds in a collaborative and supportive environment
• Competitive salary based on experience, with full medical and dental & vision benefits
• Stock in an early-stage startup growing quickly
• Generous, flexible paid time off policy
• 401(k) with Financial Guidance from Morgan Stanley

Benefits

• Extend CCPA HR Notice