Staff Full Stack Engineer, B2B

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:

• Lead the design and implementation of full-stack features across our B2B platform, working directly with product and operations leadership.
• Drive the convergence of multiple legacy stacks into the core CookUnity codebase, making key architectural decisions along the way.
• Automate and simplify operationally complex processes from smart fridge inventory management to healthcare meal delivery workflows.
• Maintain and scale our AWS infrastructure to support rapid vertical growth.
• Mentor engineers across the team and contribute to raising the technical bar.
• 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:

• Ensure the platform is scalable, reliable, and efficient across all B2B verticals.
• Identify and address technical debt and performance bottlenecks proactively.
• Own the design and implementation of platform features within our JavaScript/Java stack that engage customers and drive meaningful business outcomes.
• Iterate on new and existing features to improve user experience, performance, and reliability.
• Actively drive the adoption of strong software architecture, engineering best practices, and emerging technologies.
• Lead and participate in code reviews; mentor engineers across experience levels.
• Contribute technically by being a hands-on coder, removing roadblocks, and resolving technical issues end-to-end.
• Partner with Product, Operations, CX, and other teams to continuously refine and improve our platform in an agile environment.
• Support and improve uptime through on-call rotations that keep the business running 24/7.
• Contribute to documentation, deployment processes, and continuous improvement initiatives.

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:

• 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 architectural trade-offs, prototype quickly, and improve code quality.
• Stay current on AI tooling best practices and share learnings with the team.

Nice To Have:

• Experience building AI-powered product features (e.g., smart recommendations, automated ordering, anomaly detection).
• Ability to evaluate and introduce new AI tools or frameworks to the team, establishing best practices and adoption playbooks.
• Prior work integrating LLM-based workflows, automation pipelines, or agentic tooling into production systems.

Minimum Requirements:

• Proven experience designing and building cloud-native architectures: backend services, 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.
• Solid understanding of distributed systems, service-oriented architecture, and API design.
• 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 engineers in a fast-moving product team.
• Excited by the opportunity to grow into a broader technical leadership role as the division scales.
• Experience with agile development methodologies and tools such as Jira.
• Strong communication and collaboration skills able to work effectively across product, design, and operations.
• Comfortable working in a startup environment where priorities shift and ownership is broad.
• Experience with observability tools (e.g., Datadog), infrastructure-as-code, or platform migrations.
• Familiarity with IoT, hardware integrations, or computer vision systems is a strong 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 were 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, wed 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.