Senior Software Engineer at Symbiotic Security (Morning Laffitte)
Symbiotic Security· Morning Laffitte·
Role details
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.
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.
Why work at Symbiotic Security
- 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).