Senior Software Engineer

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Senior Software Engineer

Morning Laffitte

Engineering

Hybrid

Full-time

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
• 👩‍💻 Abir – Engineering Manager
• 👨‍💻 Édouard – CTO

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.

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Req ID: Software eng 1