Senior Fullstack Developer

Hi there! We are South and our client is looking for a Senior Fullstack Developer!

Note To Applicants

• Eligibility: This position is open to candidates residing in Latin America.
• Application Language: Please submit your CV in English. Applications submitted in other languages will not be considered.
• Professional Presentation: We encourage you to showcase your professional experience by including a Loom video in the application form. While this is optional, candidates who provide a video presentation will be given priority.
• Interview Policy: The use of artificial intelligence (AI) tools during interviews are strictly prohibited.
• Note: As part of the final stages of our hiring process, candidates may be asked to provide professional references for a reference check. If hired, you may also be asked to update your LinkedIn profile :)
  
  

We’re looking for a Senior Fullstack Developer to join as a foundational technical hire and a key engineering partner to the CTO. This is a high-ownership role where you will be responsible for building features end-to-end, making architectural decisions, and helping shape the long-term technical direction of the product.

The ideal candidate is a highly experienced fullstack engineer with deep expertise in TypeScript, React, Next.js, and Python, who can independently drive projects from concept to production while maintaining a strong focus on scalability, code quality, and system architecture.

Key Responsibilities

• Own the end-to-end development lifecycle of new features, from designing solutions and building systems to deploying production-ready applications.
• Partner with the CTO on technical strategy, architecture decisions, and long-term engineering planning.
• Design and maintain scalable frontend applications using TypeScript, React, Next.js, and Tailwind CSS.
• Build and improve backend services using Python, FastAPI, SQLAlchemy, and Celery.
• Make architectural decisions, evaluate technical trade-offs, and establish development best practices.
• Identify and reduce technical debt by improving code quality, maintainability, and system reliability.
• Develop real-time functionality using technologies such as Streaming, SSE, and WebSockets.
• Own testing strategies across frontend and backend, ensuring application stability and scalability.
• Mentor other developers and contribute to raising the overall engineering standards of the team.
  
  

Key Requirements

• 6+ years of professional experience as a Fullstack Developer.
• Proven experience independently owning and delivering production-level applications and features.
• Expert knowledge of TypeScript, React, Next.js, and Tailwind CSS.
• Strong backend development experience with Python and FastAPI.
• Experience designing and maintaining APIs, backend services, and scalable system architectures.
• Strong understanding of PostgreSQL, database design, queries, and transaction management.
• Ability to make and defend architectural decisions while balancing scalability, complexity, and delivery speed.
• Experience improving existing codebases, reducing technical debt, and maintaining high-quality engineering standards.
• Hands-on experience with frontend and backend testing frameworks.
• Strong problem-solving skills and the ability to work autonomously with minimal guidance.
  
  

Nice To Have

• Experience with vector databases and AI-related data systems.
• Familiarity with S3-like storage solutions.
• Experience building and maintaining real-time applications.
• Previous experience working closely with CTOs or as an early engineering hire.
• Experience mentoring developers or establishing engineering processes.
• Familiarity with tools such as Jest, Cypress, Playwright, or pytest.
  
  

Schedule: Monday to Friday, 9:00 AM – 6:00 PM, with a minimum of 4 hours of daily overlap with Central European Time (CET)

Compensation: Contractor model – USD salary

Location: Fully remote

If this opportunity sounds good to you, send us your resume!