Senior Software Engineer (python) - XTM One

Description

The Company

Founded in 2022, Filigran is a global cybersecurity company on a mission to empower defense teams to be proactive through open-source solutions that uncover threats and drive action.

Filigran stands out in the cybersecurity ecosystem through its open-source, AI-powered and threat-informed approach to Continuous Threat Exposure Management (CTEM). Our eXtended Threat Management (XTM) platform brings together threat intelligence, exposure validation and cyber risk reduction, enabling organizations to better understand their threat landscape and take action.

At the heart of Filigran is our open-source approach. Our vision is to unite defenders into a global community to make security more open, resilient and collaborative.

As Filigran continues to scale globally, we are building the organization, infrastructure and capabilities needed for our next stage of growth. How we scale matters just as much as how fast we scale: our CORE values: Cohesion, Openness, Responsibility and Equity shape how we work together, make decisions and build for the future.

Responsibilities

• 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.

Benefits

• We are a fast-growing, global and remote-first company , and we believe the best work combines purpose, impact and innovation . You’ll work alongside talented people across the world who care about what they build, how they build it, and the impact they make on the broader cybersecurity ecosystem.
• Be part of something bigger
• We believe we do work that matters. Our open-source approach means that work extends beyond Filigran. You’re contributing to technology and ideas that strengthen a global community of defenders and help make cybersecurity more open and collaborative.
• Work at the edge of what’s next
• We bring together cybersecurity, open source and AI — giving you the opportunity to work with emerging technologies, experiment with new ways of working, and contribute to how they are applied in practice.
• Global opportunity without borders
• Be part of a fast-growing, truly international team — collaborating across Europe, North America, APJ and beyond, with the flexibility of a remote-first environment. As we grow, you’ll have opportunities to expand your scope, take ownership, learn quickly and grow with us.
• A culture grounded in CORE
• Cohesion, Openness, Responsibility and Equity define how we work together — with openness, ownership, collaboration and respect. These are the principles that guide how we make decisions, treat people and grow together, especially when no one’s watching.
• What you can expect
• Competitive compensation + equity — everyone shares in our success
• Remote-first flexibility — work from wherever you’re based, with flexibility built into how we operate
• 25 days PTO baseline — real time to disconnect, recharge and enjoy life outside work
• Volunteer days — paid time to contribute to causes that matter to you
• Set up for success — choose the equipment that works for you, with additional support for your remote work and development needs as our programs evolve
• Two annual in-person get-togethers — one global company get-together and one team get-together, creating dedicated time to connect, collaborate and strengthen our culture beyond the screen