Senior Software Engineer II

Extend is revolutionizing the post-purchase experience for retailers by providing AI-driven solutions that enhance customer satisfaction and drive revenue growth. They are seeking a Senior Software Engineer II to join their Fulfillments team, where the role involves building impactful software for large ECommerce and Brick and Mortar merchants, while collaborating closely with cross-functional teams.

Responsibilities:

• 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

Requirements:

• 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
• Exceptional communication across product, business stakeholders, designers, support, and engineers
• Expert in TypeScript, Node.js, and React