Senior Software Engineer
il y a 2 jours
Title:
Senior Fullstack Software Engineer (Python / TypeScript / React)
Location:
Paris (Morning Laffitte, Hybrid — 2 remote days/week)
Language requirement:
French B2+ and English B1+
Salary : 60K - 80K€ + ESOP
Contract:
Full-time, CDI
About Symbiotic Security
Symbiotic Security is a cybersecurity startup based in Paris, building an
AI-powered assistant
that helps developers write secure code.
Integrated directly into IDEs and CI/CD pipelines, our solution detects and fixes vulnerabilities, including those generated by tools like GitHub Copilot.
We combine
deep cybersecurity expertise
,
modern engineering practices
, and
cutting-edge AI
to help developers build safer software, faster.
- Founded in
2024 - 16 team members
across Paris and New York - Strong engineering & product culture
- Modern offices at
Morning Laffitte (Paris 9th)
We're now expanding our tech team with a senior fullstack engineer who thrives in a collaborative and high-autonomy environment.
Role Overview
You will work on both backend (≈70%) and frontend (≈30%), contributing to our SaaS platform and internal tools. You will collaborate closely with:
- Abir
— Engineering Manager - Minh Thang
— Tech Lead - Édouard
— CTO
This role has significant ownership, technical depth, and the opportunity to shape a fast-growing product from early stages.
Your Responsibilities
- Develop and maintain backend services and APIs (Python, Django).
- Build and improve frontend features (React, TypeScript).
- Contribute to our
hexagonal architecture
and
DDD
approach. - Work on diverse topics: REST APIs, CLI tools, AI agents, monitoring.
- Improve performance, reliability, and code quality.
- Lead code reviews, testing strategies, and release processes.
- Mentor teammates and contribute to engineering best practices.
- Collaborate with product, design, and cybersecurity teams.
What We're Looking For
Required
- 5+ years of professional experience in software engineering
- Strong experience with
Python
(Django = strong plus) - Strong experience with
React
/
TypeScript - Solid SQL knowledge (PostgreSQL preferred)
- Experience working in high-quality engineering environments
- Ability to work and communicate in
English (B2+) and French (B2+) - Comfortable using LLMs (ChatGPT, Copilot, Claude)
Nice-to-Haves
- Experience with DDD or hexagonal architecture
- Experience with monitoring / logging / performance work
- Interest in cybersecurity (not required)
Mindset
- Curious and rigorous
- Autonomous and impact-driven
- Low ego, collaborative, strong communicator
- Product-oriented, eager to build meaningful software
Tech Stack at Symbiotic
- Backend:
Python 3.12+, Django, REST API - Frontend:
TypeScript, React SPA - Database:
PostgreSQL - Infra:
AWS, Docker, Terraform - Tooling:
Sentry, observability, internal analytics - Testing:
94% backend coverage
Why Join Us
- €60–80K depending on experience
- ESOP
- 100% health insurance
- Swile meal card
- RTT + paid vacation
- €500 equipment budget
- 2 remote days/week
- Collaborative, no-ego engineering team
- Deep-tech product with real impact
- Fast hiring process ( 2 weeks)
Hiring Process
- Intro call with Blanche (Talent Acquisition) — 30 min
- Interview with Abir (Engineering Manager) — 45 min
- On-site technical test — 2h
- Culture fit + team lunch — 2h
- Offer
-
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