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Remote in Brazil, Argentina, Colombia - Experienced Python Developer Contractor at Stack Builders. Build the future of autonomous cybersecurity with us! We’re looking for a . senior-level Python developer . to contribute to one of the most ambitious security automation initiatives in the industry—turning an AI-generated prototype into a production-grade platform and shaping the next generation of automated risk analysis tools.. At . Stack Builders. , your initiatives are valued, your voice is heard, and you’re supported in exploring your potential and growing. You will collaborate directly with the client’s security product lead in an agile, highly technical environment focused on automation, data engineering, and AI-augmented development. You’ll be deeply involved in all aspects of the engineering process—from clarifying detection logic and ingestion requirements to building scalable pipelines, workflow engines, and automated response systems.. Ready for this Python challenge? We will give you the resources, autonomy, and flexibility needed to do your best work. Keep reading!. You are highly proficient in. Python 3.10+. and experienced in building large, production-grade backend systems.. You have experience with . data ingestion pipelines. , REST APIs, event/log processing, or message queues.. You have hands-on experience with . Elasticsearch / Kibana. , or similar search/analytics platforms.. You are comfortable working with . MongoDB. and ideally have experience with . MongoEngine. or another ODM.. You understand or have worked with . SOC, SIEM, SOAR, EDR,. or incident response tooling.. You can integrate with third-party APIs and manage auth, throttling, error handling, retries, and async patterns.. Experience working in or extending a . large existing codebase (~50K lines).. You have familiarity with workflow/orchestration engines (custom or Python ecosystem).. AI-First Mindset. You are comfortable using . AI coding tools (Claude Code, Copilot, Cursor, ChatGPT). as part of your daily workflow.. You can direct AI with clear prompting, refine its output, and detect subtle correctness or security issues.. You value AI as a productivity multiplier—not a crutch—and you never copy AI output blindly.. Nice-to-Have. Knowledge of . threat intel APIs s. uch as VirusTotal, Abuse.ch, MISP, and OTX.. Familiarity with . Windows event logs . or endpoint telemetry.. Experience with . Go. (not required but favored for long-term scalability).. Exposure to React/Next.js is a plus (future risk-rating UI team will integrate with your backend work).. Ways of Working. Advanced professional spoken and written English skills.. Your communication is clear, organized, and assertive.. You can work . a minimum of 4 hours overlapping with the US Eastern timezone . for real-time collaboration with the client.. You enjoy working in a small, senior, high-ownership team.. You are eager to learn, grow, and have fun while addressing meaningful challenges.. What You Will Work On. Productizing and extending a Python-based . Security Automation Platform . that replaces L1/L2 SOC operations.. Developing integrations with . threat intelligence services. (VirusTotal, Abuse.ch).. Designing and improving a . multi-process automation architecture. and a YAML-based workflow engine.. Ensuring all development is . AI-first. , with AI generating 60–70% of the first-draft code.. Company Location: Brazil.