Senior Full-Stack Engineer (Backend-Leaning)

Location: LATAM — Remote

Job Type: Full-time

Experience Level: Senior — 7+ years

Compensation: USD 8,000–11,000/month

Work Schedule: 9 a.m.–9 p.m., six days per week (996)

About the Company

We’re partnering with an early-stage B2B SaaS company building an AI-powered sales and marketing platform. Following strong early traction, the company is developing a self-serve product designed to help salespeople and marketers work more effectively.

You’ll join a small senior engineering team, working directly with the co-founders to build core product capabilities and shape technical decisions.

About the Role

We’re looking for a Senior Full-Stack Engineer with strong backend expertise who can take features from architecture through production deployment.

This role combines product development, backend architecture, and hands-on infrastructure ownership. You should be comfortable working across the stack, shipping independently, and using advanced AI-assisted development workflows while maintaining sound engineering judgment.

The stack includes Python, FastAPI, TypeScript, Node.js, PostgreSQL, Elasticsearch, Docker, Kubernetes, AWS, and GCP.

Responsibilities

• Design, build, and ship product features end-to-end, with a primary focus on backend services and architecture.
• Develop reliable APIs and contribute to scalable distributed systems.
• Contribute to user-facing functionality and integrations across the full stack.
• Own deployment and infrastructure needs, including CI/CD, containers, Kubernetes, and cloud environments.
• Take responsibility for your work from technical design through production operation.
• Build and use agentic development workflows with tools such as Claude Code and Codex.
• Review, test, and correct AI-generated code to maintain quality and reliability.
• Collaborate directly with the founding team on architecture, priorities, and delivery.

Must Have

• 7+ years of software engineering experience, with strong backend expertise and full-stack delivery capabilities.
• Strong engineering fundamentals across system architecture, distributed systems, and API development.
• Hands-on production experience with CI/CD, Docker, Kubernetes, and cloud infrastructure.
• Ability to contribute across a Python/FastAPI and TypeScript/Node.js stack.
• Advanced experience using Claude Code or Codex for agentic development workflows beyond autocomplete.
• Ability to independently evaluate, debug, and improve AI-generated code.
• A track record of shipping products to real users at technology product companies; experience limited to consulting or internal enterprise IT does not meet this requirement.
• Based in LATAM.
• Availability for the stated 996 work schedule.

Nice to Have

• Based in Argentina, particularly Buenos Aires, Rosario, or Córdoba.
• Experience with PostgreSQL, Elasticsearch, AWS, and GCP.
• Experience building custom agentic development systems on top of Claude Code or Codex.
• Previous founder experience, including launching a product with real customers.
• Competitive programming experience, such as ICPC or national competitions.
• An active GitHub profile with meaningful contributions or reviewable production-quality code.
• Recognized academic achievements, government-funded scholarships, or merit-based offers or internships at leading technology companies.

Soft Skills

• Strong ownership and autonomy, with the ability to move work forward without extensive supervision.
• Product thinking and a focus on delivering value to real users.
• Sound judgment when balancing delivery speed, reliability, and technical quality.
• Clear communication and close collaboration with a small engineering team.
• Adaptability in an early-stage environment with evolving priorities.

Benefits

• Full access to AI development tools, including multiple licenses per engineer.
• Direct collaboration with the founding team.
• Significant ownership over product development and technical decisions.
• Remote work across LATAM.