1X Software Engineer interview questions & guide 2026

Our interview process is designed to evaluate your technical depth, problem-solving methodology, and ability to thrive in a collaborative, mission-driven environment. While questions vary by team, the following categories represent core areas of focus.

Technical & Systems Expertise

These questions test your fundamental understanding of the tech stack and your ability to design systems that are both performant and maintainable.

• How would you design a robust communication protocol for a distributed robotic system?
• Explain the trade-offs between different concurrency models in a real-time OS environment.

Preparation at 1X requires a balance of deep technical mastery and a pragmatic, systems-thinking approach. You should be prepared to discuss not just the "how" of your code, but the "why" behind your architectural choices and how they align with our mission.

Technical Depth – We expect a high level of proficiency in your primary language and a deep understanding of the underlying systems you work with. Demonstrate this by explaining how your code interacts with the OS, memory, or network layers.

Systems Thinking – You will be evaluated on your ability to consider the entire lifecycle of a feature, from design and implementation to testing and deployment on physical robots. Show that you think about edge cases, failure modes, and scalability.

Collaboration and Communication – Engineering at 1X is highly collaborative. You will be expected to articulate complex technical concepts clearly to cross-functional partners and demonstrate how you contribute to a culture of collective ownership.

The interview process at 1X is designed to be rigorous but transparent, mirroring the complexity of the work we do. You can expect a series of conversations that begin with technical screening and progress toward deeper dives into systems design, coding proficiency, and team-based problem solving. We value candidates who show intellectual curiosity and a disciplined approach to engineering.

The timeline above illustrates the progression from initial screening to technical deep dives and final assessments. Use this structure to pace your preparation, ensuring you have refreshed your knowledge of core computer science fundamentals before the technical rounds, and prepared concrete examples of your past work for behavioral assessments.

Systems Design and Architecture

This area is critical because our software must function reliably in unpredictable physical environments. We look for your ability to design modular, scalable, and fault-tolerant systems.

Be ready to go over:

• Distributed Systems – Understanding how to manage state and communication across multiple nodes.
• Resource Management – Efficiently handling CPU, memory, and power constraints inherent in robotics.

Coding and Implementation

We prioritize clean, readable, and efficient code. You should be able to translate requirements into high-quality implementations under pressure.

Be ready to go over:

• Data Structures and Algorithms – Demonstrating efficiency and optimal time/space complexity.
• Language Proficiency – Deep knowledge of your primary language's standard library and common pitfalls.
• Unit Testing and Validation – How you ensure your code works correctly before it ever touches a robot.
• Advanced concepts – Lock-free data structures, low-level memory management, and compiler optimizations.

Example questions or scenarios:

• "Implement a thread-safe task queue with specific priority requirements."
• "Refactor this snippet to improve performance and readability while maintaining original functionality."

As a Software Engineer at 1X, your daily life will involve writing high-performance code that drives our robotic platforms. You will work within cross-functional teams, collaborating closely with mechanical and electrical engineers to integrate software features into physical builds.

You will spend a significant portion of your time iterating on core systems, improving CI/CD efficiency, or enhancing the reliability of our software stack. You aren't just writing code for a screen; you are building the intelligence that powers movement and interaction. Whether you are optimizing operating system performance or building out cloud infrastructure to support fleet management, your work is essential to keeping our robots functional and safe in the field.

We seek engineers who are as passionate about the mission as they are about the craft of software development.

• Must-have skills – Strong proficiency in C++, Python, or Rust; deep experience with Linux/Unix environments; proven ability to design and debug complex, distributed, or real-time systems.
• Nice-to-have skills – Experience with ROS (Robot Operating System), containerization (Docker/Kubernetes), hardware-software integration, and low-level kernel or driver development.
• Soft skills – Strong communication, a proactive problem-solving mindset, and the ability to work effectively in a fast-paced, high-growth startup environment.

Q: How difficult are the technical interviews? A: The interviews are challenging and focus on real-world engineering scenarios rather than abstract puzzles. Expect to dive deep into the trade-offs of your past technical decisions.

Q: What is the typical timeline? A: The process usually spans a few weeks. We aim to move efficiently, but we are thorough in our evaluation to ensure a good fit for both the candidate and the team.

Q: Is this role fully remote? A: Most roles at 1X are based in San Carlos or Hayward, CA, as we work closely with physical hardware that requires on-site collaboration and testing.

• Own your past work: Be ready to discuss the specific challenges you faced in previous roles, including failures and how you overcame them.
• Focus on the "why": When discussing architectural choices, explain the trade-offs you considered and why you chose your specific path.
• Show your passion: We are building the future of robotics; share your interest in the field and why you want to contribute to our mission.
• Ask thoughtful questions: Use the interview to learn about our engineering culture and the specific technical hurdles your prospective team is currently facing.

Joining 1X as a Software Engineer is a unique opportunity to push the boundaries of what is possible in robotics. By focusing on systems design, coding proficiency, and your ability to navigate complex engineering trade-offs, you will be well-positioned to succeed in our rigorous evaluation process. Remember to draw on your past experiences to demonstrate both your technical depth and your collaborative mindset.

For additional interview insights, practice questions, and comprehensive preparation resources, please explore Dataford. We wish you the best of luck in your preparation and look forward to seeing the impact you can make at 1X.

The provided salary data reflects the competitive compensation packages offered at 1X, which vary based on the specific engineering focus and seniority level. Candidates should interpret these ranges as a baseline, keeping in mind that total compensation often includes equity and benefits tailored to the role's strategic importance.