23andMe's Interview Process (2026)

Blog / 23andMe's Interview Process (2026)
23andMe Interview Process
The 23andMe software engineer interview process typically runs four to six weeks from application to offer, and most candidates report a consistent structure across screening, technical, and onsite stages.
  • Recruiter Screen: A standard introductory call, usually around 30 minutes, covering your background, interest in 23andMe, and general fit for the role.
  • Hiring Manager Screen: A deeper conversation, typically 30 to 45 minutes, focused on your technical experience, project history, and how you handle ambiguity in an engineering context.
  • Technical Phone Screen: A live coding session, usually around 60 minutes, conducted in a shared environment like CoderPad, where you can expect one or two Medium-difficulty algorithmic problems.
  • Virtual Onsite: A half-day of virtual interviews, generally four rounds, typically covering algorithmic coding, practical or real-world coding, system design, and a behavioral round.
To prepare effectively, focus your study plan on three core areas that consistently come up across the onsite rounds:
  • Data Structures & Algorithms (DSA): LeetCode-style coding problems focused on practical logic and clean implementation.
  • System Design: Designing scalable, privacy-conscious systems with a focus on distributed architecture and data pipelines.
  • Behavioral: Mission-driven questions about collaboration, adaptability, and your reasons for joining 23andMe.
1. Data Structures & Algorithms (DSA)23andMe's coding rounds tend to focus on practical problem-solving rather than obscure puzzles. Most candidates report seeing Medium-difficulty problems, with a clear emphasis on string manipulation, hash maps, and heaps. You are unlikely to face Hard dynamic programming questions, so prioritize clean logic and edge case handling over exotic algorithms.Specific problems that have come up in 23andMe interviews include Group Anagrams, Longest Substring Without Repeating Characters, and Repeated DNA Sequences. The DNA-themed problems are worth noting because they test string and hash map skills in a context that feels native to the company's domain.For broader preparation, working through our top 100 DSA questions is a solid starting point. You can also drill into the most relevant topic areas directly, like heaps and sliding window, which map closely to what 23andMe tends to test.
2. System DesignSystem design at 23andMe goes beyond standard scalability questions. Interviewers in 2025 and 2026 have placed notable emphasis on privacy-preserving design, including how you handle PII, enforce data anonymity, and build systems that comply with a "Privacy by Design" philosophy. Be ready to articulate these considerations without being prompted.You may also be asked to design systems that handle genomic data pipelines, large-scale immutable datasets, or subscription-based consumer services. Questions touching on cloud architecture, containerization with Docker, and Infrastructure as Code tools like Terraform have also been reported. Brush up on High-Level Design concepts and practice sketching out architectures using our System Design practice tool.Even if you are interviewing for a general software engineering role, expect some discussion around compute pipelines and complex data dependencies. This is not a biology test, but you should be comfortable talking through how you would build or debug a pipeline processing massive, structured datasets.
3. BehavioralThe behavioral round at 23andMe is heavily tied to the company's values and its current moment as an organization. Candidates in 2025 and 2026 report questions specifically about resilience and adapting to organizational change, which reflects the company's recent restructuring. Going in without awareness of the company's current state is a missed opportunity.Expect questions like "Why 23andMe?" and "How do you handle shifting requirements mid-sprint?" Your answers should show genuine interest in the health and genomics space, not just a desire for a tech role. Interviewers are looking for mission-driven engineers who can operate through ambiguity.Structuring your answers using the STAR format will help you stay focused and concrete. For broader prep, the Behavioral Playbook covers the patterns most likely to come up in this kind of values-focused interview.
ConclusionStart your prep by locking in the DSA fundamentals, then move into system design with a privacy-first mindset, and make sure your behavioral answers reflect a genuine connection to 23andMe's mission. For a structured path through every stage, follow the 23andMe Interview Roadmap and work through it step by step.

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