---
title: 'Senior Software Engineer (python) - XTM One at Filigran'
canonical: 'https://feeny.ai/job/senior-software-engineer-python-xtm-one-filigran-france-a674wvm5etga'
type: 'job'
last_seen: '2026-09-13'
---

# Senior Software Engineer (python) - XTM One at Filigran

- **Company:** Filigran
- **Location:** France
- **Employment:** full-time
- **Work type:** remote
- **Posted:** 2026-09-08
- **Last confirmed live:** 2026-09-13
- **Apply:** https://jobs.ashbyhq.com/filigran/c3407574-eb2c-4703-b81b-3afa00b219c1

## Job description

🌀 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.

## About Filigran

## Company Overview
- **One-liner**: Filigran provides an open-source eXtended Threat Management (XTM) platform that unifies threat intelligence, adversarial exposure validation, and remediation to help organizations proactively anticipate and manage cyber threats.
- **Entity Type**: Private (Series C – $58M raised in November 2025)
- **Headquarters**: New York, United States
- **Founded**: 2022
- **Founders**: Samuel Hassine (CEO & Co‑founder), Julien Richard (CTO & Co‑founder)

## Core Business
- **Industry**: Cybersecurity – specifically threat intelligence, breach and attack simulation, and crisis management.
- **Target Customers**: B2B – enterprises, government organizations, and cybersecurity practitioners (6,000+ organizations served).
- **Mission**: “Empower defense teams to be proactive — through open-source solutions that uncover threats and drive action.”

## Products & Services
- **[OpenCTI](https://filigran.io/)**: Cyber Threat Intelligence platform that helps organizations manage and operationalize CTI knowledge and observables. Open-source.
- **[OpenAEV](https://filigran.io/)**: Adversarial Exposure Validation platform (formerly OpenBAS) for creating attack simulations, stress tests, and tabletop crisis exercises. Open-source.
- **[XTM Hub / XTM One](https://filigran.io/)**: AI‑native cockpit that ties the entire suite together, leveraging automation and a rich library of integrations.
- **OpenGRC**: A third module announced alongside the Series C to cover governance, risk, and compliance.

All products are open‑source and can be deployed on‑premises or in the cloud.

## Market Standing
- **Total Funding**: $115M across four rounds:
  - Seed (June 2023): $5.4M led by Moonfire Ventures
  - Series A (Feb 2024): $16.3M led by Accel
  - Series B (Oct 2024): $35M led by Insight Partners
  - Series C (Nov 2025): $58M led by Eurazeo
- **Annual Revenue**: Not publicly available (LinkedIn estimates $1M, but this is not an official figure).
- **Notable Investors**: Accel, Insight Partners, Eurazeo, Moonfire Ventures.
- **Growth Signals**:
  - Headcount grew 107.6% YoY to 173 employees (LinkedIn, mid‑2026).
  - Selected for the French Tech Next40/120 program (top French scale‑ups).
  - Operates in 20+ countries with teams in EMEA, North America, and APJ.
  - Used by over 6,000 public and private organizations globally.
  - Active community with 500+ members and a library of pre‑built integrations.

## Competitive Advantages
- **Open‑source core**: Transparent, auditable, and extensible; builds trust and community.
- **Unified XTM platform**: Combines CTI, adversarial exposure validation, and GRC (soon) in one stack, reducing tool sprawl.
- **AI‑native (XTM One)**: Automates threat prioritization and remediation, aiming for autonomous threat management.
- **Community‑driven**: Rich pre‑built content and integrations shared by a global defence community.

## Strategic Focus
- **AI & Automation**: Developing XTM One as an “AI‑native cockpit” to automate threat management workflows.
- **Global expansion**: Scaling sales and support in North America, APJ, and EMEA.
- **Product breadth**: Adding OpenGRC to move beyond threat management into broader cyber risk and compliance.
- **Open‑source leadership**: Deepening the open‑source ecosystem to attract contributors and accelerate innovation.

## Why Work Here
- **Remote‑first**: Fully distributed team – “work fits your life.”
- **Competitive pay and equity**: Everyone shares in the company’s success.
- **Choice of gear**: Employees pick their own hardware and setup.
- **Open‑source culture**: Transparency, agility, and community spirit are core values.
- **Diversity commitment**: Equal opportunity employer; “from code to culture.”
- **Global team**: 20+ nationalities, offices/footprint across EMEA, NA, and APJ.
- **High growth**: 107% headcount growth in the last year, creating opportunities for impact and career progression.

## Sources
1. [Filigran website](https://filigran.io/)
2. [Our Story | Filigran](https://filigran.io/our-story/)
3. [Careers | Filigran](https://filigran.io/careers/)
4. [Filigran – LinkedIn](https://www.linkedin.com/company/filigran)
5. [Filigran – Job Board](https://jobs.ashbyhq.com/filigran)

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