Obsidian Solutions Group Software Engineer interview questions & guide 2026

The following questions reflect the technical rigor and mission-focused nature of the Software Engineer role. While actual interviews vary based on specific team needs and project requirements, you should expect a blend of deep technical inquiry and practical application.

Technical Proficiency and Languages

These questions assess your ability to develop high-performance code and your fluency in the primary languages used in Obsidian Solutions Group projects.

• How have you utilized C++ or Python to solve performance-critical problems in a Linux environment?
• Can you describe a time you had to optimize code for limited-resource hardware, such as a Raspberry Pi or Arduino?

Preparation for Obsidian Solutions Group requires a balance of core computer science fundamentals and specialized knowledge in security-adjacent technologies. You should focus on demonstrating how your technical expertise directly translates to mission success.

Technical Competency – You must be prepared to discuss your mastery of C/C++, Python, and Linux. Interviewers will look for evidence that you can write efficient, maintainable, and secure code, particularly in environments where hardware resources are constrained.

Systems Thinking – Because this role involves hardware-software integration, you need to show that you understand the full stack. Be ready to explain how your software interacts with physical systems, RF environments, or external APIs.

Collaborative Problem Solving – You will often work alongside hardware engineers and field technicians. Demonstrate your ability to translate complex technical requirements into user-friendly software by providing examples of how you have collaborated on cross-functional teams in the past.

The interview process at Obsidian Solutions Group is designed to evaluate your technical depth, your ability to handle complex security-focused challenges, and your alignment with the company’s mission-first culture. You can expect a rigorous assessment that focuses on your past projects and your potential to solve real-world problems. The pace is generally efficient, reflecting the urgent nature of the work performed for the Department of State.

This timeline provides a high-level view of the progression from initial screening to potential final interviews. Use this to structure your preparation, ensuring you have your project examples ready for the technical deep-dives and that you are prepared to discuss your security clearance status early in the process.

Software Development Lifecycle

You will be evaluated on your ability to take a feature or tool from concept to implementation. Strong candidates show a disciplined approach to research, design, coding, testing, and deployment.

Be ready to go over:

• Code Optimization – Techniques for improving performance in C/C++ and Python.
• Debugging and Testing – Your methodology for ensuring software reliability in field-deployed environments.
• Documentation – How you maintain clear records for complex, proprietary systems.

Hardware-Software Integration

This is a key differentiator for the Software Engineer role. Expect to be tested on your ability to work with physical hardware and understand the constraints of the platforms you are programming for.

Be ready to go over:

• Software-Defined Radio (SDR) – Understanding the architecture and common challenges.
• Embedded Systems – Experience with Raspberry Pi, Arduino, or similar platforms.
• RF Technologies – Familiarity with the vulnerabilities and behaviors of Wi-Fi, Bluetooth, and cellular protocols.

As a Software Engineer, your primary responsibility is to research and develop software that counters emerging technological threats. You will work within the Operations and RF countermeasures sections, meaning your code will directly impact the security of U.S. government personnel and property.

You will spend a significant portion of your time collaborating with hardware engineers to ensure that the software you develop is fully compatible with the equipment being deployed in the field. This includes conducting research on current IoT and wireless technology trends to identify potential vulnerabilities. You will also engage with field users to gather requirements and iterate on your designs, ensuring that the finished product meets the high standards required for diplomatic security operations.

To be competitive for this position, you must demonstrate a strong technical foundation combined with the ability to obtain and maintain a high-level security clearance.

• Must-have skills:
  • Bachelor’s degree in Computer Science or a related field.
  • At least three (3) years of professional software engineering experience.
  • Proficiency in C/C++, Java, JavaScript, SQL, and Python.
  • Strong experience with Linux software development.
  • Ability to obtain and maintain a Top Secret/SCI security clearance.
• Nice-to-have skills:
  • Previous experience working with Department of State or DOD-related security projects.
  • Advanced understanding of RF signal analysis or cybersecurity threat research.
  • Hands-on experience with Raspberry Pi or Arduino in a production or research context.

Q: How long does the interview process typically take? The timeline can vary depending on the specific project needs and the complexity of the security clearance verification process. Generally, candidates should expect a professional and focused process that prioritizes finding the right fit for mission-critical work.

Q: What is the most important thing to emphasize during the interview? Focus on your ability to solve complex, real-world problems. Obsidian Solutions Group values candidates who are "doers and thinkers" who can take a technical challenge and see it through to a functional, high-performance solution.

Q: Is remote work an option for this role? No, this position is based in Rosslyn, VA, and requires an in-office presence. The sensitive nature of the work and the need for close collaboration with hardware teams mean that remote work is not supported.

• Understand the Mission: Spend time researching the Bureau of Diplomatic Security. Understanding the "why" behind your code makes you a much stronger candidate.
• Focus on the "How": When discussing past projects, don't just state what you did. Explain your technical decision-making process, especially the trade-offs you made.
• Prepare for Clearance Questions: Be prepared to discuss your current clearance status openly and honestly.
• Be Ready for Technical Scenarios: If you are asked to design a system, start by asking clarifying questions to define the scope and constraints before jumping into a solution.

The Software Engineer role at Obsidian Solutions Group offers a unique opportunity to apply your technical skills to high-impact security missions. By focusing your preparation on your core development skills, your experience with embedded systems, and your ability to work within a collaborative, mission-driven environment, you will be well-positioned to succeed.

You can explore additional interview insights, practice questions, and preparation resources on Dataford. Remember that your technical expertise is only part of the equation; your ability to work independently and as part of a team committed to operational excellence will be just as important.

The salary data provided reflects the compensation range for this position, which is determined by your experience, technical qualifications, and the specific requirements of the project team. Candidates should interpret these figures as a competitive market baseline for the role, with total compensation often including comprehensive benefits packages that support you and your family.