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Senior Software Engineer - Python (Django) / Typescript (React) - CDI

Package : 65-85K + BSPCE

Location : Paris 9th (Morning Laffitte) - 2 remote days / week

About Symbiotic Security

Symbiotic Security is an AI-native cybersecurity startup building security copilots that live where developers work, in the IDE and CI/CD pipelines. We operate two core product lines, Symbiotic Flow (security workflows and automation) and Symbiotic Code (developer-first security in code and tooling). We don’t just find bugs, we help teams remediate AI-generated flaws and ship more secure code with real-time guidance

• The Scale: 25 team members across Paris & NY
• The Growth: Aiming for 6 new strategic hires by the end of 2026
• The Culture: High technical standards, no-ego, and a product-driven mindset

The Rolr

Join our Paris-based tech team as a Senior Fullstack Engineer. You will play a key role in evolving our SaaS platform, working closely with our CTO (Édouard), EM (Abir), and Tech Lead (Minh Thang)

• Focus: 70% Backend (Python/Django) | 30% Frontend (React/TypeScript)
• Architecture: We are scaling a monolithic architecture using Hexagonal Architecture and DDD principles
• Impact: You won't just ship features; you'll lead technical scopes, drive performance initiatives, and mentor peer

Technical Stack

• Backend: Python 3.12+, Django (REST API)
• Frontend: TypeScript, React (SaaS platform & IDE plugin)
• Quality: 94% backend test coverage (100% on business logic)
• Tools: PostgreSQL, AWS, Sentry, CLI tools, and AI agents.

Who You are

• Experience: 5+ years of software engineering, with a track record of delivering complex systems
• Mastery: Strong expertise in Python and TypeScript. Django experience is a major plus
• Craftsmanship: Deep understanding of SOLID, DRY, and Clean Code. Curiosity for DDD is essential
• Mindset: Early-stage startup spirit : autonomous, fast, and impact-driven. You understand the "Why" before the "How"

Why Join Symbiotic ?

• Elite Tech Culture: Monthly "Bug Days," "cool-down" periods for internal tech projects, and systematic code reviews
• AI-First: Every developer is encouraged to use LLMs (Copilot, Claude, ChatGPT) in their workflow
• Package: Competitive base salary + BSPCE (Equity) + 100% Health cover
• Environment: Bright offices at Morning Laffitte (Paris 9e), 2 remote days/week, and a vibrant team culture

Fast-Track Hiring (2 Weeks)

1. Screening: Call with our Talent Acquisition, Blanche (30 min)
2. Manager Interview: Meeting with our EM, Abir (1H)
3. Technical: On-site test with our Tech Lead, Minh Thang (2H)
4. Culture Fit: Meeting with the CTO and lunch with the team.