Full Stack Developer (Python)

About Sofira:

Sofira is building the future of legal services. We create AI agents that automate repetitive corporate legal work, leveraging our team's 12 years of experience processing millions of legal documents.

The Opportunity: Become a Founding Engineer

This isn't just another Senior Developer role. This is a chance to be a core member of our founding engineering team, reporting directly to our CTO, Pedro Leme (ex-Head of Engineering at Jusbrasil).

You will be solving some of the most complex and interesting technical challenges in the Brazilian tech scene today. Your mission will be to build a robust, scalable platform that tames the chaos of legacy government systems and leverages the latest in Generative AI to deliver real-world value. If you are driven by solving hard problems that have a massive impact and want to build the technical foundations of a future market leader, this is the role for you.

What You'll Do (Your Mission):

• Design and build the foundational architecture for our AI agent platform, ensuring it is scalable, resilient, and secure from day one to support our journey towards ISO 27001 certification.
• Lead the complex engineering challenge of integrating with dozens of legacy government systems, transforming our core competitive advantage into a robust and reliable service.
• Develop the data and machine learning infrastructure that powers our agents—including our proprietary data processing pipelines and vector databases—in close collaboration with our ML Engineer.
• Take full ownership of key features across the entire stack, from our Python backend and APIs to our modern frontend, ensuring a seamless and high-quality user experience.
• Champion engineering excellence through high-quality code, robust testing, and collaborative code reviews, helping to define the technical culture of Sofira as a founding engineer.

Who You Are (The Profile):

We value your mindset and your ability to execute above all else. You are the right fit if:

• You have a deep sense of ownership. You don't just write code; you take ownership of features from the initial idea through to deployment and maintenance. You feel the pain when things break and the pride when customers are delighted.
• You are a pragmatic builder with a natural 'hacker mindset'. You don't freeze when faced with the unknown; you find the simplest, most efficient path through complex problems. You have a strong bias for action and favor clever, practical solutions that work now over theoretically perfect ones that might work someday.
• You are relentlessly proactive and a self-starter. You don't wait for tasks. You see opportunities for improvement in the codebase, in the infrastructure, or in a process, and you take the initiative to fix them.
• You are a true Full Stack professional. You are comfortable and skilled in both backend and frontend development and are not afraid to learn new technologies to get the job done.
• You are a strong collaborator. You enjoy working in a tight-knit team, engaging in healthy debates about technical decisions, and mentoring other engineers as the team grows. You know how to leverage your peers to find the best solutions.
• You are mission-driven and ambitious. You are excited by the opportunity to build a category-defining company from the ground up. You are energized by the mission, not just the clock.

What You'll Need (The Hard Skills):

• 5+ years of professional software development experience.
• Deep expertise in Python and at least one of its web frameworks (e.g., FastAPI, Django, Flask).
• Solid experience with a modern frontend framework (e.g., React, Vue, Svelte).
• Strong knowledge of SQL databases (e.g., PostgreSQL).
• Experience deploying and maintaining applications on a major cloud provider (GCP, AWS, or Azure).
• Fluency in English.
• Huge Plus (Bonus Points):
  • Experience working with LLM APIs (OpenAI, Anthropic, Google, etc.).
  • Familiarity with the RAG pattern, LangChain, or vector databases.
  • Familiarity with AI Agents patterns and libs.
  • Previous experience in a high-growth B2B SaaS startup.

Why You'll Love Building Sofira With Us:

• Solve Hard, Interesting Problems: You will work on a unique technical challenge – taming Brazil's legacy systems with modern AI. This is not another CRUD app.
• Build with the Best Tools: We have an AI-first engineering culture. You will be equipped with tools like Claude Code, Codex and Cursor to maximize your productivity and focus on creative problem-solving.
• Build from Zero & Have a Massive Impact: As a founding engineer, your decisions will shape our product, our culture, and our future success.
• Ownership: We want our founding team to have a real stake in our success.