Obsidian Security Data Scientist interview questions & guide 2026

The following questions are representative of the patterns observed in technical leadership interviews at Obsidian Security. These are designed to test your ability to bridge the gap between high-level security strategy and low-level data implementation.

Technical & Domain Expertise

Focuses on your understanding of security infrastructure and your ability to apply ML to non-traditional data.

• How would you design an ontology to track identity and authorization changes across multiple SaaS platforms?
• Explain the challenges of performing entity resolution when dealing with disparate audit logs from different vendors.

Preparation for Obsidian Security should focus on your ability to synthesize domain knowledge with rigorous engineering. Do not simply prepare for standard coding questions; expect to be challenged on your ability to apply data science principles to the messy, real-world constraints of cybersecurity.

Technical Depth – You must demonstrate an expert-level proficiency in Python and modern ML tooling. Interviewers will look for evidence that you can move beyond theoretical models to shipping production-grade systems, specifically those involving knowledge graphs or semantics.

Security Intuition – You don't need to be a CISO, but you must show a "healthy dose of curiosity" about how enterprise applications are designed. Be ready to discuss the trade-offs in identity, authentication, and authorization models used in modern SaaS environments.

Strategic Decomposition – The role requires turning "fuzzy" security problems into concrete ML tasks. Practice explaining how you move from a high-level business goal (e.g., "detect unauthorized data exfiltration") to specific data experiments and measurable outcomes.

The interview process at Obsidian Security is designed to be as rigorous as the problems they solve. You can expect a sequence that balances deep technical assessment with a strong emphasis on leadership and collaborative problem-solving. The pace is typically fast, reflecting the company’s "IPO-ready" momentum, and you will likely engage with both technical peers and leadership stakeholders.

The process typically begins with a technical screen to assess your baseline proficiency and interest in the security domain. This is followed by a series of deep-dive rounds that include a system design component, a technical leadership interview, and a cultural fit assessment. You should expect the technical portions to be highly interactive, resembling a whiteboard session where you and the interviewer work through a complex, real-world security scenario together.

This timeline illustrates the progression from initial qualification to the final decision-making stages. Use this as a map to pace your preparation, ensuring you have enough time to brush up on both your core ML foundations and your understanding of SaaS security architectures.

Ontology and Data Modeling

This area is critical because the Obsidian Security product relies on a unified ontology to map security risks across different SaaS platforms.

• Be ready to go over:
  • Graph database structures and query optimization for security use cases.
  • Strategies for normalizing heterogeneous data sources (e.g., mapping diverse API responses to a common schema).

As a Tech Lead – Data Scientist, your day-to-day will be a blend of high-level architecture and hands-on research. You will lead the effort to scale the Obsidian Security ontology, which involves automating the process of mapping new enterprise applications into the system. This requires a "scrappy" mindset—you will frequently find yourself diving into vendor documentation and raw audit logs to find the hidden signals that indicate a security risk.

You will also spend significant time collaborating with product managers and security practitioners from Global 1000 companies. Your goal is to translate their security requirements into concrete ML and data problems. You are not just building software; you are building a product that allows these teams to see, detect, and respond to threats in real-time. Expect to drive the technical direction of your team, ensuring that your data systems are not only accurate but also maintainable and scalable as the company grows toward IPO.

A successful candidate for this role is one who combines the rigor of a researcher with the pragmatism of a software engineer.

• Must-have skills:
  • 6+ years of experience in data science or machine learning.
  • 2+ years in a technical leadership role.
  • Expert-level proficiency in Python and modern data stacks.
  • Demonstrated ability to ship production ML systems at scale.
• Nice-to-have skills:
  • Deep knowledge of identity security (e.g., OAuth, SAML, SCIM).
  • Experience with knowledge graphs (e.g., Neo4j, AWS Neptune).
  • Prior experience working in a SaaS security or infrastructure company.

Q: How much time should I dedicate to preparing for the "security" aspect of the role? A: You don't need a background in cybersecurity, but you must be able to demonstrate a rapid learning curve. Spend time researching how modern SaaS platforms handle authentication and logging; being able to speak the language of a security engineer will set you apart.

Q: Is the technical interview focused on LeetCode-style problems? A: No. The technical assessments at Obsidian Security are heavily focused on real-world system design and your approach to data problems. Expect to discuss trade-offs in architecture and how you would handle messy, real-world data.

Q: What is the culture like for a Data Scientist at Obsidian? A: It is a high-ownership environment. You will be expected to be "scrappy," diving into documentation and finding solutions when clear answers aren't available. It is a collaborative but fast-paced team where individual initiative is highly valued.

• Show your process: When answering design questions, verbalize your trade-offs. The interviewers care more about how you think through constraints than finding a single "correct" answer.
• Be ready to "dive deep": If you mention a technology or concept on your resume, be prepared to explain it at an architectural level.
• Align with the mission: Familiarize yourself with the concept of "agentic AI" in security. Showing that you understand the future direction of the industry will make you a much more compelling candidate.
• Ask high-level questions: At the end of your interviews, ask about the challenges of scaling the ontology or the roadmap for new integrations. This shows you are already thinking like a leader.

The Tech Lead – Data Scientist role at Obsidian Security is a high-impact position that sits at the intersection of cutting-edge AI and critical enterprise security. By mastering the balance between complex data modeling and practical, customer-focused security outcomes, you position yourself as a vital leader in the company's growth.

Focus your preparation on your ability to architect scalable ML systems and your capacity to learn and apply deep domain knowledge about SaaS platforms. With a structured approach to these technical and leadership challenges, you can demonstrate exactly why you are the right person to help Obsidian Security define the future of SaaS security.

The salary data reflects the high-level expertise required for this role. Remember that compensation at this level is often a package including equity, which aligns your long-term success with the company’s progress toward IPO readiness.