---
title: 'Senior Software Engineer at Symbiotic Security'
canonical: 'https://feeny.ai/job/senior-software-engineer-symbiotic-security-morning-laffitte-2p2cgwm5pagj'
type: 'job'
last_seen: '2026-09-09'
---

# Senior Software Engineer at Symbiotic Security

- **Company:** Symbiotic Security
- **Location:** Morning Laffitte
- **Employment:** full-time
- **Work type:** hybrid
- **Posted:** 2026-01-06
- **Last confirmed live:** 2026-09-09
- **Apply:** https://jobs.gem.com/symbiotic-security/am9icG9zdDphi-3c2iOS0lqeyjDpBp79

## Job description

Fullstack Software Engineer (Python / TypeScript / React) 📍 Paris (Morning Laffitte) | Full-time | 2 remote days per week 🌍 Tech Team | Role split 70% backend / 30% frontend

## 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 ➡️ 16 team members split between Paris (Tech team) and New York (Sales team) ➡️ Goal: 15 new hires by the end of 2026 Our offices are located at Morning Laffitte (Paris 9ᵗʰ) — bright open spaces with collaborative areas, a friendly atmosphere, and a focus on productivity.

Tech Stack & Environment

- Backend: Python 3.12+ / Django (monolith, REST API)
- Frontend: TypeScript / React (SPA) for the frontend of the SaaS platform,
- Typescript for the IDE plugin
- Database: PostgreSQL
- Architecture: Monolithic - Hexagonal, DDD being introduced
- Tests: 94% backend coverage, 100% business logic covered
- Tools: Sentry, logs, traces, internal analytics
- Satellite services: CLI tools & AI agents written in Python

## Your Mission

- Contribute to both the backend (70%) and frontend (30%) of our SaaS product.
- Participate in the design and evolution of our hexagonal architecture and DDD approach.
- Collaborate closely with Abir (Engineering Manager), Minh Thang (Tech lead) and Édouard (CTO) on technical and product decisions.
- Work on diverse projects: REST APIs, CLI tools, AI agents, performance optimization.
- Lead continuous improvement initiatives, such as code reviews, automated testing, and release management.
- Offer technical guidance to team members, fostering a culture of learning and professional development.

## What We’re Looking For

Core Skills

- Master's degree in Computer Science or related field.
- Proven experience (min 5 years) as a software engineer, with a strong track record of designing and delivering complex software systems, Python and TypeScript required ✅
- Demonstrated expertise in backend development using Python. An experience of Django would be a strong plus.
- Demonstrated expertise in frontend development using Typescript / React.
- Solid SQL knowledge (PostgreSQL preferred)

Appreciated

- Experience working with Product Manager, Product Designer, or UI/UX person.
- Strong grasp of clean code principles (SOLID, DRY, YAGNI)
- Understanding or curiosity for DDD
- Monitoring / logging / API optimization = big plus
- Comfortable using LLMs (ChatGPT, Copilot, Claude)

Soft Skills & Mindset

- Early-stage startup mindset: autonomous, fast, impact-driven
- Curious, rigorous, and eager to understand before acting
- Strong communicator, collaborative, no ego
- Capable of challenging ideas and defending opinions constructively
- Product-oriented with a desire to build meaningful software
- Work-life balance valued

## What You’ll Have Achieved

Timeframe Key Milestones 3 months First features shipped, ramp-up on the stack, contribution to testing pipeline 6 months Leading a technical scope, improving architecture, driving performance or monitoring initiatives 12 months Recognized internal expert / coach within the team

Methodology & Culture

- Agile-ish organization (2-week sprints, continuous releases)
- Systematic code reviews
- Occasional pair programming
- Mix of maintenance, new features, and R&D work
- Monthly “Bug Day” (stress testing the product)
- “Cool down period” planned for internal tech projects 💡 AI culture: every developer is encouraged to use ChatGPT, Copilot, or Claude as part of their workflow.

## Team

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.

- [👩‍💻 MT – Lead Engineer](https://www.linkedin.com/in/mtmvu/)
- [👩‍💻 Abir – Engineering Manager](https://www.linkedin.com/in/abir-khalladi/)
- [👨‍💻 Édouard – CTO](https://www.linkedin.com/in/edouardviot/)

Team culture:

- Collaboration > hierarchy
- Technically demanding but kind environment
- No-ego culture
- Strong product–tech alignment

## Compensation & Benefits

💰 BSPCE (equity) available 🏥 100% health insurance coverage 🍽️ Swile meal card 💻 €500 equipment budget 🚲 Allowance for Sustainable Commuting (e.g., cycling, carpooling, public transport) 🏖️ RTT + paid vacation 🏡 2 remote days per week 🪴 Important opportunities for career advancement and professional development by being a pioneer within a new company. 🧑‍🔬 Strong product & engineering culture in the company. 🥂 Vibrant and inclusive company culture with regular team outings and events. ☝🏽 Chance to make a meaningful impact and shape the future of Symbiotic. 👭 Referral bonus: €2,000

Hiring Process We respect your time and will make it quick and efficient. All of that will be completed within two weeks.

- Call with our Talent Acquisition - Blanche - 30 minutes
- Meeting with our Engineering Manager - Abir - 45 minutes to 1 hour.
- On-site technical test with our tech lead - Minh Thang - 1,5 hour.
- Culture fit - Meeting with the CTO and lunch with the team - 2 hours
- Formal hiring proposal.

## About Symbiotic Security

## Company Overview
- **One-liner**: Symbiotic Security provides an AI code generation agent that embeds security enforcement directly into the development workflow to produce compliant, secure code.
- **Entity Type**: Private (Seed stage)
- **Headquarters**: New York, New York, United States
- **Founded**: 2024
- **Founders**: Jérôme Robert (CEO) and Edouard Viot (CTO)

## Core Business
- **Primary industry/industries**: Computer and Network Security, AI-assisted Software Development
- **Target customers**: Engineering and security teams at organizations that care about data security, compliance, and developer productivity (B2B, Enterprise)
- **Mission or purpose statement**: To make AI usage safe throughout the manufacturing of software, ensuring organizations can accelerate development while maintaining security standards.

## Products & Services
- **Symbiotic Code**: An AI code generation agent that enforces security policies, verifies outputs, auto-remediates issues, and revalidates correctness before code is returned. It is model-agnostic, supporting 15+ models.
- **AI Guardrails**: Allows companies to inject their security policies into their AI coding assistant so every suggestion meets their standards.
- **In-IDE Detection & Auto-fix**: Surfaces issues instantly in the IDE, with context-aware fixes customized to the codebase.
- **Just-In-Time Training**: Provides in-context, in-IDE training to help developers understand the "why" behind security fixes.
- **PR & CI/CD Protection**: A VCS bot flags vulnerabilities in PRs, and CI/CD scans ensure every build stays secure.

## Market Standing
- **Valuation/Market Cap**: Not publicly available
- **Key Metric**: Total Funding of $13M raised across two Seed rounds.
- **Notable Investors/Partners**: Lerer Hippeau, Alven (lead), Axeleo Capital, Factorial Capital.
- **Growth Signals**: Claims a 93% reduction in AI-generated vulnerabilities. Workforce grew 71.4% year-over-year (19 employees as of latest data). Has active job postings for engineering roles in Paris.

## Competitive Advantages
- **Model-Agnostic**: Unlike competitors tied to a single LLM, Symbiotic works across 15+ models, offering flexibility.
- **Security-First Generation**: Security is embedded into the generation workflow itself, not as an afterthought, aiming to prevent vulnerabilities before they happen.
- **Developer Education**: Unique focus on just-in-time training to upskill developers on security, making them more self-sufficient.
- **Experienced Leadership**: Founders have deep cybersecurity expertise and a track record of successful exits (Lexsi, Alsid).

## Strategic Focus
- **Expanding Language Support**: Currently focused on infrastructure-as-code (Terraform), with plans to expand to Python, JavaScript, and the rest of the application stack.
- **Building a Remediation Model**: Using the high-quality dataset of bug-fix pairs generated from their platform to train a model for automatic remediation.
- **Scaling the Team**: Actively hiring for senior engineering roles in Paris to grow their product and engineering capabilities.

## Why Work Here
- **Mission-Driven**: Opportunity to work on a critical problem at the intersection of AI and security, ensuring safe and productive use of AI in software development.
- **Strong Founding Team**: Work directly with experienced cybersecurity veterans who have a history of building and exiting successful companies.
- **High Growth Stage**: With $13M in funding and a rapidly growing team (71.4% YoY), this is an early-stage opportunity with significant ownership and impact.
- **Remote-Friendly**: The workforce is distributed across France, the United States, Canada, and Spain, suggesting a flexible work environment.
- **Open Positions**: Currently hiring for "Software engineer Typescript" and "Senior Software engineer Python / TS" in Paris (CDI).

## Sources
1. [Symbiotic Security Website](https://www.symbioticsec.ai/)
2. [Symbiotic Security About Us](https://www.symbioticsec.ai/about-us)
3. [Symbiotic Security LinkedIn](https://www.linkedin.com/company/symbiotic-security)
4. [Symbiotic Security on Built In](https://builtin.com/company/symbiotic-security)
5. [TechCrunch: Symbiotic Security helps developers find bugs as they code](https://techcrunch.com/2024/11/05/symbiotic-security-helps-developers-find-bugs-as-they-code/)

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