Senior Fullstack engineer

il y a 1 semaine

Paris, Île-de-France Symbiotic Security Temps plein


Paris (Morning Laffitte)
|
2 remote days/week
|
Full-time

€60K–€80K + BSPCE

About Symbiotic Security

Symbiotic Security
is a cybersecurity startup helping developers write secure code through an AI-powered assistant integrated into their IDE and CI/CD pipelines. Our solution has two unique strengths: it provides developers with interactive training to understand vulnerabilities as they code, and it automatically detects and remediates security flaws introduced by generative AI tools such as GitHub Copilot.

Founded in April 2024, we are currently a team of 14 based in
Paris
and 2 in
New York
.

Our product team brings together diverse profiles working collaboratively: fullstack engineers, AI engineers, cybersecurity experts, product managers, and product designers: all coming from different backgrounds.

Your mision :

As a
Senior Fullstack Engineer
, you'll work closely with our
CTO (
Edouard
), Engineering Manager (
Abir
) and Tech lead (
Minh Thang) to shape both the
architecture
and the
user experience
of our SaaS platform.

You will:

  • Own development across
    backend (70%)
    and
    frontend (30%)
  • Design and implement scalable, secure systems (Python / Django / React)
  • Collaborate with Product & Design to deliver impactful features
  • Mentor junior devs and raise engineering standards
  • Improve performance, reliability, and developer experience

You'll be part of a small,
high-impact team
where every line of code matters.

Our tech stack

  • Backend:
    Python 3.8 / Django (REST API, monolith)
  • Frontend:
    TypeScript / React (SPA)
  • Database:
    PostgreSQL
  • Infra:
    AWS / Docker / Terraform
  • Architecture:
    Hexagonal, with DDD in progress
  • Testing:
    94% backend coverage
  • Tooling:
    Sentry, internal analytics, CLI tools, AI agents

What we are looking for:

Core skills

Python & Django

TypeScript / React

Solid SQL knowledge (PostgreSQL a plus)

Clean architecture, testing, and performance mindset

Bonus points if you're into:

  • DDD, domain modeling, or system design
  • AI-assisted development (Copilot, ChatGPT, Claude…)
  • Developer experience or security topics
  • Cloud + containerization (AWS, Docker, Terraform)

Mindset

  • Startup DNA: autonomous, fast, pragmatic
  • Curious and product-oriented
  • Strong communicator, collaborative, no ego
  • Balance between delivery and craftsmanship

Package

  • €60K–€80K depending on experience (senior role)
  • BSPCE
    (equity plan)
  • 100% health insurance
  • Swile meal card
  • €500 equipment budget
  • RTT + paid vacation
  • 2 remote days/week
  • Office: Morning Laffitte (Paris 9ᵉ)
  • Referral bonus: €2,000

Hiring Process (2 Weeks max)

Interview with Blanche (TAM)

Tech Interview with Abir

On-site Technical Test with Minh Thang

Culture Fit - Discussion with Edouard and team lunch

How to apply

You can
apply directly on LinkedIn
(Easy Apply)
or
send an email to

with the subject line: [Senior Fullstack Engineer] FirstName LastName – Application

Please include:

  • Your
    LinkedIn profile or résumé
  • Your availability
    for a first call
  • Anything you'd like us to know

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