Senior Software Engineer

Senior Software Engineer – OpenCTI

Filigran

Location:
France

Category:
IT - Software Development

Contract Type:
Not provided

Salary:

Not provided

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Job Description:

We’re looking for a Senior Software Engineer to join the OpenCTI team and contribute to the core of our open-source platform. In this role, you will work on features and technical topics that are central to how users interact with and rely on OpenCTI. You will bring strong technical expertise and have a direct impact on the product roadmap, collaborating closely with product, engineering, and community contributors. The role involves working across a modern stack including Node.js, TypeScript, React, GraphQL, and ElasticSearch.

Job Responsibility:

Contribute actively to the OpenCTI codebase, with strong ownership of new features and continuous improvements
Identify, investigate, and resolve bugs
Participate in technical brainstorming and task refinement, challenging both new proposals and existing implementations
Take part in the on-call rotation and act proactively during incidents to drive resolution
Mentor junior and mid-level engineers, supporting their technical growth
Address technical debt and legacy pain points
Lead or facilitate technical workgroups to explore and align on engineering topics
Review pull requests from internal teams and the open-source community
Contribute to documentation and the shared knowledge base

Requirements:

7+ years of experience as a Software Engineer, with solid exposure to complex, production-grade systems
Strong proficiency in a modern JavaScript/TypeScript stack, including Node.js, React, GraphQL, and experience with data-oriented systems such as ElasticSearch
Comfortable working in a remote, async-first environment, with strong written communication skills
Proven ability to work autonomously, take ownership of technical topics, and drive initiatives from design to delivery
A collaborative mindset, with a strong sense of team spirit and a willingness to mentor and support less experienced engineers
Ability to challenge existing solutions, address technical debt, and contribute to long-term architectural improvements

Nice to have:

Experience contributing to or working with open-source projects is a strong plus
Bonus: Prior exposure to cybersecurity, threat intelligence, or large-scale data platforms, and knowledge of Rust

What we offer:

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

Additional Information:

Job Posted:
February 18, 2026

Employment Type:

Fulltime

Work Type:

Remote work

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