[Hiring] Senior Full Stack Engineer, B2B (Partnerships & Integrations) @CookUnity

Role Description

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.

Qualifications

• You have experience designing and building cloud architecture, backends, middle ends, web apps—end-to-end delivery ownership.
• Experience with NodeJS, NestJS, AWS, and React.
• Experience with integrations: consuming and designing REST APIs, handling authentication (e.g., OAuth/API keys), working with webhooks/events, and building resilient workflows.
• Experience with relational databases such as MySQL or PostgreSQL.
• Experience with automated testing and continuous integration and deployment.
• You understand how to design, implement, and maintain backend services that will be used by internal teams and external partners.
• You have an advanced level of English (written and spoken), comfortable collaborating with international stakeholders and partner engineering teams.
• Fluency with AI engineering tools.

Requirements

• 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 (often in English) to unblock execution and ensure alignment.
• Improve uptime & support the on-call rotation that helps the business run 24/7.

Benefits

• 💸 Get paid in USD!
• 🗺 Work remotely: design the life that you want.
• ⛱ Enjoy 15 business days of vacation each year from the start date.
• 🎄 16 fully paid Argentinean holidays.
• 🩺 Healthcare Benefit: Monthly stipend to use in your preferred healthcare provider.
• 🗓️ 5-year Sabbatical: After 5 years with CookUnity, you get a 4-week paid sabbatical.
• 🐣 Paid family leave.
• 🕯 Compassionate Leave: 3-5 days each time the need arises.
• 🧘🏽‍♀️ Customize the benefits that suit your needs! Access a range of perks tailored to you, including learning opportunities, wellness memberships, delivery apps, and more through our comprehensive benefit platform.
• 🧑‍🏫 Personalized English coach.