Senior Full Stack Engineer, B2B (Partnerships & Integrations)

About CookUnity: Food has lost its soul to modern convenience. And with it, it has lost the power to nourish, inspire, and connect us. So in 2018, CookUnity was founded as the first-of-its-kind platform that connects the world with the source of truly great food: chefs. Today, CookUnity delivers 50 million meals a year from the industry’s best chefs to homes all over the country. Fresh. Ready-to-eat. And crafted with the passion that nourishes body and soul. Unwilling to stop there, CookUnity is expanding beyond delivery to become an ever-innovating marketplace focused on our singular mission: empower Chefs to nourish the world. If that mission has you hungry in more ways than one, you’ve found the right job posting. About the Team: Our B2B department, established at the beginning of 2024, is on the brink of significant growth. Our mission is clear: to reach roughly $458k in MRR by the end of the first semester of 2026 and provide a stellar customer experience with limited pain on our operations. We are creating a dedicated Partnerships & Integrations squad within B2B. This team will focus on building and scaling third-party integrations and commercial partnerships that expand CookUnity distribution and unlock new revenue channels (e.g., our Airbnb integration, and future opportunities with platforms like Instacart, Amex, and others). The Role: Help integrate CookUnity with third-party platforms (marketplaces, loyalty programs, travel partners, payments/benefits providers, etc.) by designing and implementing robust, scalable, and reusable integration patterns. Help shape the future of B2B expansion and product distribution by working directly with the Head of B2B and cross-functional stakeholders. Learn the ins and outs of a complex, operationally heavy business and simplify/automate partner workflows through technology. Oversee projects across a full-stack environment, with challenges on the front-end, backend, and mobile experience—often involving external partner systems, APIs, and technical constraints. Be hands-on and build a world-class partner-enabled customer experience, delivering solutions that can be used at scale quickly and safely. Maintain/scale our AWS infrastructure supporting integrations, reliability, observability, and secure data exchange with partners. Our Current Stack: Languages: Java, JavaScript, Typescript, Frameworks: ReactJS, NestJS Infrastructure: AWS, Kubernetes, MySQL Agile Methodology Service Oriented Architecture Responsibilities: Ensure that partner integrations and platform components are scalable, reliable, secure, and efficient. Identify and address technical debt and performance bottlenecks, especially in integration flows and high-volume partner traffic scenarios. Manage and maintain databases, ensuring they are optimized for performance and reliability across integration-related workloads. Own the design and implementation of features within our JavaScript stack that power partner experiences and drive meaningful business impact. Build and evolve integration foundations: API design, authentication/authorization, webhooks/events, idempotency, retries, monitoring/alerting, and partner-facing documentation where needed. Iterate on new and existing features to improve user experience, operational efficiency, and partner success metrics. Actively contribute to strong software architecture, best practices, and long-term technical direction—prioritizing reusable components and patterns that accelerate future partnerships. Improve the maturity of our technical stack with engineering best practices (testing, CI/CD, code quality, reliability). Participate in the code review process and help mentor other engineers. Contribute technically by being a hands-on coder, removing roadblocks, and repairing technical issues across integration flows. Partner closely with Product, Growth, Marketing, Customer Experience, and external stakeholders; communicate effectively with third-party integration teams (ofte