---
title: 'Senior Software Engineer  (Copy) at Symbiotic Security'
canonical: 'https://feeny.ai/job/senior-software-engineer-copy-symbiotic-security-morning-laffitte-fn7tdn6trc4k'
type: 'job'
last_seen: '2026-09-09'
---

# Senior Software Engineer  (Copy) at Symbiotic Security

- **Company:** Symbiotic Security
- **Location:** Morning Laffitte
- **Employment:** full-time
- **Work type:** hybrid
- **Posted:** 2026-03-10
- **Last confirmed live:** 2026-09-09
- **Apply:** https://jobs.gem.com/symbiotic-security/am9icG9zdDpF7MaXx4O2hqTAfeLNhXw-

## Job description

📍 Paris (Morning Laffitte) | Full-time | 2 remote days per week 🌍 Tech Team | Role split Full JS (Node/React) with mission-first contributions on Python services when needed

🚀 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.

Our main products:

- Symbiotic Code — https://www.symbioticsec.ai/products/symbiotic-code
- Symbiotic Flow — https://www.symbioticsec.ai/products/symbiotic-flow

➡️ Founded in April 2024 ➡️ 24 team members split between Paris (Tech team) and New York (Sales team) ➡️ Goal: 10 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.

🎯 Your Mission

- Build and ship product features across our JavaScript/TypeScript stack (Node + React) for Symbiotic Code.
- Contribute to performance, reliability, and overall system design as we scale.
- Collaborate closely with Abir (Engineering Manager), Minh Thang (Tech lead) and Édouard (CTO) on technical and product decisions.
- Work on diverse scopes: APIs, portal features, IDE experience, CLI workflows, and internal tooling.
- Lead continuous improvement initiatives: code reviews, automated testing, CI quality gates, and release practices.
- Offer technical guidance to the team and help raise the quality bar.

Mission-first mindset: we look for engineers who are ready to “cross the aisle”. If you’re a JS expert, you should be open to learning and contributing to our Python services when the mission requires it.

🌱 What You’ll Have Achieved 3 months First features shipped on the JS stack, strong ownership on a scope, confident navigation of the codebase and dev workflow 6 months Leading a technical scope end-to-end, raising testing discipline, driving performance/reliability improvements 12 months Recognized internal expert / coach on JS/TS architecture and delivery at scale

⚙️ Tech Stack & Environment

- Languages: JavaScript / TypeScript (primary)
- Frontend: React (portal / SaaS experience)
- Backend: Node.js (TypeScript) for APIs and services
- Testing: strong testing discipline (unit/integration, CI-driven)
- Nice to have: Python, Bun, OpenTUI
- Observability: logs / traces / monitoring (tooling in place; experience appreciated)

🧠 What We’re Looking For 🎓 Core Skills

- Proven experience (typically 5+ years) as a software engineer delivering production systems.
- Strong track record in TypeScript/JavaScript ✅
- Solid experience with React and Node.js (fullstack ownership)
- Strong engineering fundamentals: system thinking, pragmatic architecture, clean code, and delivery discipline
- Strong testing discipline and ability to design for maintainability

🎓 Appreciated

- Experience designing and operating asynchronous/distributed systems
- Observability / performance optimization / reliability mindset
- Comfort using LLM tools (ChatGPT, Copilot, Claude) responsibly
- Ability (and curiosity) to contribute to Python services when needed

💬 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

🧩 Methodology & Culture

- Agile 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
- Technical “case” (Algorithm live coding + System Design) + debrief — 2 hours
- 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/)

## Other roles at Symbiotic Security

- [MLops / Devops - AI Platform](https://feeny.ai/job/mlops-devops-ai-platform-symbiotic-security-morning-laffitte-ezmvs31fd3ky) — Morning Laffitte
- [Freelance Senior Software Engineer Django](https://feeny.ai/job/freelance-senior-software-engineer-django-symbiotic-security-morning-laffitte-nbezz8bpnw0s) — Morning Laffitte
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