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eCommerce • Food • Software
The Senior Software Engineer II will design, develop, and maintain backend systems for payment processing, lead technical projects, optimize performance, and mentor engineers while collaborating with cross-functional teams.
Top Skills:
GoJavaMemcachedMySQLPostgresRedisRuby
Artificial Intelligence • Information Technology • Business Intelligence
The Senior Software Engineer will design, develop, and maintain full-stack applications, mentor junior engineers, and collaborate with teams to deliver software solutions in the fintech space.
Top Skills:
AngularAWSDatabricksJavaPythonSQLTypescript
Information Technology • Software • Database • Analytics
As a Senior Software Engineer II on the AI team, you'll design and maintain AI-driven backend systems, integrate LLM APIs, and create internal tools to enhance workflows.
Top Skills:
ClaudeGeminiOpenaiPythonRust
About Extend:
Extend is revolutionizing the post-purchase experience for retailers and their customers by providing merchants with AI-driven solutions that enhance customer satisfaction and drive revenue growth. Our comprehensive platform offers automated customer service handling, seamless returns/exchange management, end-to-end automated fulfillment, and product protection and shipping protection alongside Extend's best-in-class fraud detection. By integrating leading-edge technology with exceptional customer service, Extend empowers businesses to build trust and loyalty among consumers while reducing costs and increasing profits.
Today, Extend works with more than 1,000 leading merchant partners across industries, including fashion/apparel, cosmetics, furniture, jewelry, consumer electronics, auto parts, sports and fitness, and much more. Extend is backed by some of the most prominent technology investors in the industry, and our headquarters is in downtown San Francisco.
About The Role:
We are looking for an exceptional Senior Software Engineer II to join the Purchase Experience (PEX) 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, processing millions of API requests daily, directly influencing how our merchants and customers interact with our services.
You’ll partner closely with cross-functional teams in product, merchant integrations, design, operations, and the broader engineering organization - contributing significantly to a culture of innovation, continuous improvement, and excellence.
What You'll Do:
- Architect and develop highly scalable, event-driven applications and APIs using AWS Serverless technologies.
- Collaborate seamlessly with product managers, designers, and integration specialists to deliver robust, user-focused enhancements aligned with our agile continuous delivery practices.
- Play a critical role in influencing the overall platform architecture, ensuring scalability, reliability, and maintainability while identifying opportunities to improve our offerings.
- Provide technical mentorship, coaching, and guidance to team engineers, elevating our capabilities and fostering technical growth.
- Develop and manage sophisticated data management solutions and back-end services essential to our mission-critical operations.
What We’re Looking For:
- 7+ years of demonstrated experience in full-stack software development, with a strong emphasis on backend and cloud infrastructure.
- Expert proficiency in TypeScript/NodeJS and React, including deep familiarity with modern development practices.
- Proven track record building distributed, highly available, scalable systems in cloud environments, particularly using AWS.
- Extensive experience developing robust Consumer facing and internal high performance APIs and distributed system architectures.
- Hands-on experience with AWS serverless frameworks.
- Exceptional communication skills, able to effectively articulate complex technical concepts clearly to diverse audiences, including business stakeholders, designers, support teams, and fellow engineers.
- Strong capabilities in data modeling, one table design, and diverse data management principles, ensuring efficiency, consistency, and reliability of data-driven systems.
- Experience working with and driving forward the usage of AI developer tooling in an ever shifting landscape.
Expected Pay: $185,000 per year salaried*
* The target base salary range for this position is listed above. Individual salaries are determined based on a number of factors including, but not limited to, job-related knowledge, skills and experience.
Life 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.
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What you need to know about the Seattle Tech Scene
Home to tech titans like Microsoft and Amazon, Seattle punches far above its weight in innovation. But its surrounding mountains, sprinkled with world-famous hiking trails and climbing routes, make the city a destination for outdoorsy types as well. Established as a logging town before shifting to shipbuilding and logistics, the Emerald City is now known for its contributions to aerospace, software, biotech and cloud computing. And its status as a thriving tech ecosystem is attracting out-of-town companies looking to establish new tech and engineering hubs.
Key Facts About Seattle Tech
- Number of Tech Workers: 287,000; 13% of overall workforce (2024 CompTIA survey)
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- Funding Landscape: $3.1 billion in venture capital funding in 2024 (Pitchbook)
- Notable Investors: Madrona, Fuse, Tola, Maveron
- Research Centers and Universities: University of Washington, Seattle University, Seattle Pacific University, Allen Institute for Brain Science, Bill & Melinda Gates Foundation, Seattle Children’s Research Institute
