Senior Software Engineer (Python) - XTM One
- Role
- Fullstack
- Experience
- Senior
- Employment
- Full-time
- Company size
- Startup
Open to FR only. Set where you work from to check your eligibility.
No BS summary
Senior full-stack software engineer in France with strong TypeScript and Python. Needs architecture experience, genAI framework exposure, and proficiency in English and French. Cyber Threat Intelligence standards and open-source experience are a plus.
Core skills
Optional skills
Required languages
🌀 The Company
Filigran, founded in October 2022, stands out in the cybertech ecosystem for its commitment to revolutionizing cyber threat management with a proactive approach. Its mission is to develop innovative open-source solutions designed to anticipate cyber threats, identify security gaps, and strengthen organizational security posture.
Filigran solutions are now trusted by over 6,000 public and private organizations worldwide.
🎯 The Role
We're looking for a Senior Software Engineer to join our new XTM One team and contribute in shaping a state-of-the-art product and build the core platform for our XTM Suite.
You'll work closely with the Engineering Manager and a small, agile squad to define the technical architecture and continue to enhance our unified AI solution that will unlock the true potential of our XTM Suite.
This is a high-impact role where you will balance rapid iteration with code quality to lay the foundation for a scalable product. You will not just act as an implementer, but as a key contributor to the product vision, helping us solve complex challenges.
💼 Your Responsibilities
- Full Stack Architecture: Build a clean, scalable application deployable both as SaaS and On-Premise, using Typescript and Python. You will design complex visualization flows, advanced logging capacities and agent configuration.
- Architectural Evolution: Refine the software architecture to handle the integrations with the AI team at Filigran.
- Rapid Prototyping: Iterate fast to test concepts, being comfortable with refactoring or deleting code as the product vision evolves based on user feedback.
- Community Management: Engage with the Open Source community (GitHub, Slack), answering user questions.
- Team Structuring: Participate in the creation of development processes and team culture as one of the first hires in this new squad.
🤝 Who You’ll Work With
- Direct report: You will report to the Engineering Manager.
- Team: You will form the initial squad with the Engineering Manager, with plans for the team to grow fast.
- Collaboration: You will collaborate with the VP of Tech, CTO, and AI team to align on technical standards and integration strategies with the wider ecosystem (OpenCTI / OpenAEV / OpenGRC).
🧬 Profile We’re Looking For
- Senior experience in Full Stack development, with strong proficiency in TypeScript and Python.
- Architectural Mindset: You have the ability to think critically about software architecture, you have experience with genAI frameworks, being with Agentic, RAG or simple LLM usage, potentially levering MCP servers.
- Ownership & Agility: You have experience launching projects and are comfortable navigating uncertainty. You understand that we are building a product, not just writing code.
- Full Stack mastery: You are equally comfortable working on frontend interfaces (building intuitive wizards for complex configurations) and backend logic (API design, permission models).
- Communication: Proficient in English and French .
- Bonus Points:
- Familiarity with Cyber Threat Intelligence (CTI) standards like STIX/TAXII or the MITRE ATT&CK framework.
- Experience contributing to or maintaining Open Source projects.
🛡️ About XTM One
XTM One is the Filigran AI-Native Threat Informed Defense platform, dedicated to create and run cybersecurity expert AI Agents, and host datasets and configs to be leveraged across products.
Every Product of the XTM Suite is connected to XTM One to leverage AI Agents for more proactive, easy-to-use platform.
Within XTM One, every AI Agents can use and correlate data cross products to make the most meaningful assessments and take the most relevant actions.
🌱 Why Join Filigran? More than just a job.
We’re a fast-growing, global, and fully remote company building open-source cybersecurity solutions, increasingly powered by AI, to help defense teams anticipate threats and act faster.
⭐ What we believe
We believe we do work that matters, uniting defenders into a global community to make security more open, resilient & collaborative.
💻 How we work
We do work that matters by combining strong engineering standards with emerging technologies, including AI, to move faster and smarter.
🧭 What guides us
We make our work matter by building a culture grounded in our CORE values of Cohesion, Openness, Responsibility, and Equity. The principles that guide how we make decisions, treat people, and grow together, especially when no one’s watching.
💰 Compensation & Benefits
- Competitive pay + equity - everyone shares in our success
- Remote-first, flexible, and balanced - work that fits your life
- Your setup, your choice - pick the gear that works for you
- Twice-a-year gatherings - we meet in person for regional and global offsites to connect, collaborate, and strengthen our culture beyond the screen
🌍 Equal Employment Opportunity
We enable cybersecurity through inclusion - from code to culture.
At Filigran, we are proud to be an equal opportunity employer. We believe diversity of our people make our products and our team stronger. We welcome talent of every background, identity, and lived experience, regardless of race, color, religion, gender, gender identity or expression, sexual orientation, national origin, age, disability, or veteran status.
What matters here is what you bring, not what you look like, where you’re from, or how you identify.
🚀 Ready to Join Us?
Apply now and help us build the future of the cybersecurity ecosystem, together.
What you'll do
- Build a clean, scalable application deployable both as SaaS and On-Premise using TypeScript and Python.
- Design complex visualization flows, advanced logging capacities, and agent configuration.
- Refine the software architecture to handle integrations with the AI team at Filigran.
- Iterate fast to test concepts, including refactoring or deleting code as the product vision evolves based on user feedback.
- Engage with the Open Source community on GitHub and Slack, answering user questions.
- Participate in the creation of development processes and team culture as one of the first hires in the new squad.
- Collaborate with the VP of Tech, CTO, and AI team to align on technical standards and integration strategies with the wider ecosystem, including OpenCTI, OpenAEV, and OpenGRC.
What they require
- Senior experience in Full Stack development, with strong proficiency in TypeScript and Python.
- Ability to think critically about software architecture.
- Experience with genAI frameworks, including Agentic, RAG, simple LLM usage, or potentially MCP servers.
- Experience launching projects and comfort navigating uncertainty.
- Understanding that the role is building a product, not just writing code.
- Equally comfortable working on frontend interfaces, such as building intuitive wizards for complex configurations, and backend logic, such as API design and permission models.
- Proficient in English and French.
- Preferred: Familiarity with Cyber Threat Intelligence (CTI) standards like STIX/TAXII or the MITRE ATT&CK framework.
- Preferred: Experience contributing to or maintaining Open Source projects.
Benefits
- Competitive pay + equity - everyone shares in the company's success.
- Remote-first, flexible, and balanced work.
- Choice of gear that works for you.
- Twice-a-year regional and global offsites.
Filigran, founded in October 2022, develops innovative open-source cybersecurity solutions designed to anticipate cyber threats, identify security gaps, and strengthen organizational security posture.