Senior Software Engineer

il y a 7 heures

Paris, Île-de-France Symbiotic Security Temps plein

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

  1. Intro call with Blanche (Talent Acquisition) — 30 min
  2. Interview with Abir (Engineering Manager) — 45 min
  3. On-site technical test — 2h
  4. Culture fit + team lunch — 2h
  5. Offer

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