Principal Software Engineer - XTM Integration

🌀 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.

💼 Your Responsibilities

Technical Vision & Standards for XTM Integration

• Define and own the technical principles of the XTM Integration team: architecture patterns, code quality standards, tooling choices, CI/CD practices, AI-assisted development workflows, and benchmarking approaches.

• Ensure these principles are understood, embraced, and consistently applied across the team — through documentation, code review, pairing, and example.

• Drive the evolution of the connector/integration framework shared across OpenCTI, OpenAEV, and OpenGRC — making it easier, faster, and more reliable to build high-quality integrations.

• Make key technical decisions on integration architecture: data flow design, error handling, retry strategies, observability, performance, and security.

• Stay ahead of the ecosystem — evaluate new tools, libraries, and patterns before the team needs them.

Open Source Community & Ecosystem

• Be a technical steward of Filigran's open-source integration ecosystem — ensuring that the connector framework and all published integrations are exemplary references that external contributors can learn from and build upon.

• Define and enforce contribution guidelines, code standards, and documentation practices that make it easy for community members to develop their own connectors.

• Engage with the open-source community: review external contributions, provide technical guidance, and represent Filigran's engineering culture publicly.

• Design integration APIs and SDKs with the external developer experience in mind — clarity, simplicity, and extensibility are first-class concerns.

XTM Foundation Contribution

• Participate actively in the XTM Foundation as a full member — contributing to cross-product engineering principles, shared tooling decisions, and technical standards that apply across OpenCTI, OpenAEV, and OpenGRC.

• Bring the integration team's perspective into Foundation discussions, and carry Foundation decisions back into the integration team.

• Collaborate with other Principal and Staff Engineers to maintain coherence across the full XTM engineering organization.

Hands-On Engineering

• Write production code — you lead by example, not from a distance.

• Prototype and validate new approaches before rolling them out to the team.

• Review critical PRs with depth and care; your feedback should teach, not just correct.

• Contribute to performance benchmarking and observability tooling for the integration layer.

🤝 Who You'll Work With

• Reports to: VP of Technology.

• Key collaborators: XTM Integration engineering team; XTM Foundation (Principal/Staff Engineers across OpenCTI, OpenAEV, OpenGRC); Product Managers; open-source community contributors.

• Working model: Primarily embedded in the XTM Integration team, with regular participation in XTM Foundation cross-team work.

🧬 Profile We're Looking For

• 8+ years of experience in software engineering, with a track record of technical leadership on complex, production-grade systems.

• Deep Python expertise — Python is the core language of the XTM Integration ecosystem. You know the language deeply: its idioms, its ecosystem, its packaging (Poetry, pip, uv), its async patterns, its performance characteristics.

• Solid understanding of integration and data pipeline patterns: event-driven architectures, ETL/ELT, API design (REST, GraphQL, webhooks), authentication flows, rate limiting, and error recovery.

• Proven ability to define and carry technical standards — you've been the person who raises the bar on a team, not just follows it.

• Strong open-source mindset: you understand what it means to build software for an external community, not just internal users. You care about documentation, API ergonomics, and contributor experience.

• Excellent written communication — you can write a design doc, a contribution guide,