Senior Full Stack Engineer, B2B

This position only accepts applicants based in Argentina or Uruguay.

About the Team:

CookUnity B2B is one of the company's fastest-growing divisions, scaling across four verticals — Bulk, Smart Fridge, Healthcare, and Partnership — with a bold H2 2026 north star of $44M in revenue and 120% retention rate.

Our engineering mission is equally ambitious: converge two acquired platforms into a single CookUnity codebase. B2B is the clearest example of that journey in the company — two legacy stacks, two acquired companies, converging into one. It's a high-ownership environment where engineers build at the intersection of logistics, IoT, and consumer software, with computer vision and AI-driven ordering systems already on the near-term roadmap.

If you thrive on hard problems, real business impact, and a small team where your work ships immediately — this is the role for you.

 

The Role:

• Design and implement full-stack features across our B2B platform, collaborating closely with product and operations.
• Contribute to the convergence of legacy stacks into the core CookUnity codebase, participating in architectural discussions and owning well-scoped initiatives.
• Help automate and simplify operationally complex processes — from smart fridge inventory management to healthcare meal delivery workflows.
• Write reliable, well-tested, and maintainable code that scales with a fast-growing business.
• Collaborate with and support junior engineers through code reviews and day-to-day pairing.
• Be hands-on and build products used by thousands of corporate customers from day one.

Our Current Stack:

Languages: Java, JavaScript, TypeScript

Frameworks: ReactJS, NestJS

Infrastructure: AWS, Kubernetes, MySQL

Methodology: Agile / Service-Oriented Architecture

 

Responsibilities:

• Build and iterate on platform features within our JavaScript/Java stack that drive meaningful business outcomes across B2B verticals.
• Ensure the features you own are scalable, reliable, and efficient — and raise issues proactively when you identify risks.
• Manage and maintain database schemas and queries, ensuring they are optimized for performance and reliability.
• Participate actively in code reviews, helping maintain high standards across the team.
• Identify and address technical debt and performance bottlenecks in your areas of ownership.
• Partner with Product, Operations, CX, and other teams to refine requirements and ship features end-to-end.
• Contribute to documentation, deployment processes, and continuous improvement initiatives.
• Support the on-call rotation to help the business run 24/7

AI Usage & Engineering Excellence

At CookUnity B2B, AI is not a buzzword — it's part of how we build. We expect our engineers to actively integrate AI tools into their daily workflow to move faster and build better.

Expected (day-to-day):

• Use AI-powered coding tools (GitHub Copilot, Claude / Codex) to accelerate development, code reviews, and debugging.
• Apply AI to automate repetitive engineering tasks — test generation, boilerplate, documentation, and internal tooling.
• Leverage AI assistants to explore solutions, prototype quickly, and improve code quality.
• Stay current on AI tooling best practices and share learnings with the team.

Nice to have (growth signal):

• Experience building AI-powered product features (e.g., smart recommendations, automated ordering, anomaly detection).
• Prior work integrating LLM-based workflows or automation pipelines into production systems.
• Interest in growing into a technical leadership role and helping shape AI adoption practices on the team.

 

---

Minimum Requirements:

• Solid experience designing and building production-grade backend services, REST APIs, and full-stack web applications.
• Strong proficiency with NodeJS / NestJS, ReactJS, AWS, and MySQL (or equivalent relational databases).
• Experience with Java in a production environment.
• Good understanding of distributed systems and service-oriented architecture.
• Experience with automated testing and CI/CD pipelines.
• Advanced English proficiency (written and spoken) — we're a distributed, international team.

Preferred Requirements:

• Previous experience leading or mentoring teams is highly valued.
• Experience collaborating in cross-functional teams across product, design, and operations.
• You enjoy working in small teams in a fast-paced startup environment, and are excited to grow into broader ownership over time.
• Experience with agile development methodologies and tools such as Jira.
• Strong communication skills — able to clearly articulate trade-offs and technical decisions.
• Exposure to observability tools (e.g., Datadog), infrastructure-as-code, or cloud platform operations.
• Familiarity with IoT, hardware integrations, or computer vision systems is a plus given our Smart Fridge roadmap.

---

 

Learn More About CookUnity

We believe great leadership starts with alignment on vision, values, and ways of working. To give you deeper insight into who we are and what we’re looking for, we invite you to explore: CookUnity's Leadership Principles – The values and behaviors that guide how we operate, collaborate, and scale.

We hope this provides valuable insight into our culture and product vision. If this excites you, we’d love to connect!

---

Benefits

💸 Get paid in USD

🗺 Work remotely: design the life that you want

⛱ Enjoy 15 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

🧘🏽‍♀️ Flexible benefits, your way: a prepaid card you can use on wellness, learning, food, and more.

🤖 AI-forward workplace: enterprise access to ChatGPT and Claude to help you work smarter and grow faster.

🧑‍🏫 Personalized English coach