Senior Software Engineer - Python / TS - Paris

Senior Software Engineer - Python / TS - Paris3 days ago Be among the first 25 applicantsDirect message the job poster from Symbiotic SecurityTalent Acquisition Partner at Symbiotic SecurityTitle: Senior Fullstack Software Engineer (Python / TypeScript / React)Location: Paris (Morning Laffitte, Hybrid — 2 remote days/week)Language requirement: French B2+ and English B1+Salary : 60K - 80K€ + ESOPContract: Full-time, CDIAbout Symbiotic SecuritySymbiotic Security is a cybersecurity startup based in Paris, building an AI-powered assistant that helps developers write secure code.Integrated directly into IDEs and CI/CD pipelines, our solution detects and fixes vulnerabilities, including those generated by tools like GitHub Copilot.We combine deep cybersecurity expertise , modern engineering practices , and cutting-edge AI to help developers build safer software, faster.Founded in 202416 team members across Paris and New YorkModern offices at Morning Laffitte (Paris 9th)We’re now expanding our tech team with a senior fullstack engineer who thrives in a collaborative and high-autonomy environment.Role OverviewYou will work on both backend (≈70%) and frontend (≈30%), contributing to our SaaS platform and internal tools. You will collaborate closely with:Abir — Engineering ManagerMinh Thang — Tech LeadThis role has significant ownership, technical depth, and the opportunity to shape a fast-growing product from early stages.Your ResponsibilitiesDevelop and maintain backend services and APIs (Python, Django).Build and improve frontend features (React, TypeScript).Contribute to our hexagonal architecture and DDD approach.Improve performance, reliability, and code quality.Lead code reviews, testing strategies, and release processes.Mentor teammates and contribute to engineering best practices.Collaborate with product, design, and cybersecurity teams.What We’re Looking ForRequired5+ years of professional experience in software engineeringStrong experience with Python (Django = strong plus)Strong experience with React / TypeScriptSolid SQL knowledge (PostgreSQL preferred)Experience working in high-quality engineering environmentsAbility to work and communicate in English (B2+) and French (B2+)Comfortable using LLMs (ChatGPT, Copilot, Claude)Nice-to-HavesExperience with DDD or hexagonal architectureExperience with monitoring / logging / performance workInterest in cybersecurity (not required)MindsetCurious and rigorousAutonomous and impact-drivenProduct-oriented, eager to build meaningful softwareTech Stack at SymbioticFrontend: TypeScript, React SPAInfra: AWS, Docker, TerraformTooling: Sentry, observability, internal analyticsTesting: 94% backend coverageWhy Join Us€60–80K depending on experienceESOP100% health insuranceRTT + paid vacation€500 equipment budgetCollaborative, no-ego engineering teamDeep-tech product with real impactFast hiring process ( 2 weeks)Hiring ProcessIntro call with Blanche (Talent Acquisition) — 30 minInterview with Abir (Engineering Manager) — 45 minOn-site technical test — 2hCulture fit + team lunch — 2hOffer#J-18808-Ljbffr