Vast Software Engineer interview questions & guide 2026

The questions below represent the technical rigor and focus areas you can expect during the hiring process. These are drawn from real experiences at Vast and are intended to illustrate the patterns of inquiry you will encounter.

Technical Foundations

These questions evaluate your core computer science knowledge and your ability to apply technical concepts to practical engineering problems.

• How would you design a scalable data pipeline for handling high-frequency telemetry?
• Can you explain the trade-offs between different database architectures for time-series data?

Success at Vast requires a balance of deep technical proficiency and the ability to thrive in an ambiguous, rapidly evolving environment. Your preparation should reflect both your depth of knowledge and your adaptability.

Technical Depth – You will be evaluated on your mastery of your primary programming languages and frameworks. Be prepared to discuss not just how you use these tools, but why you choose them in specific architectural contexts.

System Thinking – Vast values engineers who can see the big picture. You should be able to explain how your code interacts with the broader ecosystem, including DevOps pipelines, database layers, and hardware constraints.

Adaptability – You will often face ambiguous problems without a pre-defined roadmap. Interviewers look for candidates who can take an ill-defined requirement and structure a logical, iterative solution.

The interview process at Vast is characterized by a high degree of technical focus. You should expect a rigorous evaluation of your engineering fundamentals rather than abstract brain teasers. The cadence is fast, reflecting the company’s mission-driven, "all-in" culture, and you will likely interact with engineers who are building the very systems you will be working on.

The process is designed to be collaborative. While it is technically demanding, the goal is to see how you perform as a member of a high-performing team. You should expect to move through multiple stages that assess your ability to design, build, and ship production-grade software.

This timeline provides a high-level view of the progression from initial technical screening to final round interviews. Use this to pace your study, ensuring you have refreshed your knowledge of system design and your primary tech stack before moving into the deeper technical rounds.

Technical & Domain Expertise

This area is the cornerstone of your evaluation. You must demonstrate a strong command of the tools listed in your background, particularly in full-stack development and backend systems.

Be ready to go over:

• Full-stack architecture – Discussing the interplay between modern frontends like React or Vue and backend services.
• Data modeling – Your experience with PostgreSQL or other SQL databases in high-stakes environments.
• API design – Patterns for creating secure, scalable interfaces using GraphQL or REST.

Advanced concepts (less common):

• Integration with hardware-centric workflows or CAD software.
• Managing time-series data at scale for aerospace applications.

Problem-Solving & Ambiguity

Vast operates in a space where many challenges have no precedent. Your ability to navigate the unknown is as important as your ability to write clean code.

Be ready to go over:

• Iterative development – How you break down large, complex projects into manageable, ship-able milestones.
• Trade-off analysis – Defending your choice of technology based on constraints like performance, time-to-market, and maintainability.

As a Software Engineer at Vast, your daily work will revolve around enabling the design and build of human-rated space stations. You will collaborate closely with cross-functional teams, including hardware engineers and mission operators, to create software that is both reliable and highly efficient.

You will spend a significant portion of your time designing and implementing web applications and backend services that consume complex APIs in a heterogeneous environment. Because the company is growing rapidly, you will also be expected to iterate on tooling and adopt software practices that will scale as the codebase grows. You are expected to be a force multiplier, creating systems that help the team move faster and more safely toward the goal of permanent human presence in space.

A successful candidate for this role possesses a blend of deep technical skill and a passion for the mission.

• Must-have skills:
  • Bachelor’s degree in Computer Science, Math, or a related engineering field.
  • 6+ years of professional software development experience.
  • Demonstrated ability to build, ship, and support complex, data-intensive full-stack applications.
• Nice-to-have skills:
  • Experience with DevOps (Docker, K8s, Terraform).
  • Familiarity with time-series databases and OAuth.
  • Background in hardware engineering processes or CAD software.

Q: How long should I spend preparing for the technical interviews? A: Given the technical rigor, most successful candidates spend several weeks reviewing system design patterns and their core programming languages. Focus on depth over breadth.

Q: Is the culture at Vast highly collaborative? A: Yes. You will work with seasoned engineers from both aerospace and big tech, and the environment emphasizes mentorship and collective problem-solving.

Q: What is the typical interview process timeline? A: While timelines can vary based on the specific team and role level, the process is designed to be efficient to match the company's rapid development pace.

• Own your experience: When discussing past projects, be ready to explain the "why" behind your technical decisions, not just the "what."
• Focus on scale: Even if your previous work was not in aerospace, emphasize how you handled scale, complexity, or mission-critical requirements.
• Show your work: When solving problems during the interview, explain your thought process clearly so the interviewer can follow your logic.
• Research the mission: Understanding the specific goals of the Haven station program will help you align your answers with the company’s strategic direction.

Joining Vast as a Software Engineer offers a unique opportunity to contribute to the next generation of space exploration. By focusing on your technical foundations, demonstrating your ability to handle ambiguous system-level challenges, and showing a genuine commitment to the mission, you will position yourself as a strong candidate.

Remember that you can explore additional interview insights, practice questions, and preparation resources on Dataford to sharpen your skills before your interview day. With thorough preparation and a clear focus on the evaluation areas outlined here, you are well-equipped to succeed.

The compensation data above reflects the total range for various engineering roles at Vast. Candidates should view this as a broad market indicator; actual offers are determined by a combination of your specific technical expertise, years of experience, and the specific requirements of the team you are joining.