AvidXchange Software Engineer interview questions & guide 2026

The following questions represent the types of challenges you will face during the AvidXchange interview process. They are drawn from patterns observed in past candidate experiences and are designed to test the specific areas AvidXchange values most.

Data Structures and Algorithms (Karat Round)

This category tests your ability to write clean, efficient code under time pressure. Expect to solve 2-3 questions in 45 minutes.

• Implement a Depth-First Search (DFS) algorithm to find a specific node in a graph.
• Given a string, find the longest substring without repeating characters.

Preparing for the Software Engineer interview at AvidXchange requires a strategic approach. The evaluation process is designed to test both your foundational computer science knowledge and your practical, on-the-job engineering skills.

To succeed, you must demonstrate proficiency across the following key evaluation criteria:

• Algorithmic Problem Solving – You must be able to write clean, optimized code under time constraints. Interviewers evaluate your ability to identify the right data structures and algorithms, particularly in high-pressure, standardized testing environments.
• System and API Design – AvidXchange relies heavily on interconnected services. You will be assessed on how you architect solutions, design clean APIs, and handle ambiguous scenarios by asking the right clarifying questions.
• Domain-Specific Technical Depth – Your practical knowledge of core technologies is heavily scrutinized. Interviewers look for deep understanding of SQL optimization, object-oriented programming (OOP) principles, JavaScript asynchronous behavior, and .NET fundamentals.
• Operational Excellence and DevOps – Beyond writing code, you are evaluated on your understanding of how software is deployed, monitored, and maintained. Demonstrating knowledge of DevOps principles shows you understand the full software lifecycle.
• Culture Fit and Adaptability – Interviewers want to see how you handle feedback, communicate your thought process, and align with the mission of AvidXchange. Your ability to remain calm and structured, even when faced with poorly defined problems, is critical.

The interview process for a Software Engineer at AvidXchange is structured to efficiently filter candidates through a blend of internal behavioral screening and standardized, third-party technical assessments. You will typically begin with an initial phone screen with an internal recruiter. This conversation is focused on your background, your interest in AvidXchange, and high-level technical alignment. While mostly behavioral, be prepared for recruiters to ask basic technical trivia and take exact notes on your answers.

Following the initial screen, the technical heavy lifting begins with an outsourced technical interview conducted by Karat. This is a highly structured, one-hour session split between scenario-based API design questions and Leetcode-style coding challenges. Because this round is conducted by a third party, it can feel scripted and impersonal. Your goal here is to play by the rules of the standardized test: communicate clearly, ask clarifying questions, and write functional code swiftly.

If you pass the Karat screen, you will move to the final rounds, which consist of technical and behavioral interviews with AvidXchange engineers and engineering managers. These sessions are much more conversational and dive deep into your resume, your understanding of core technologies like SQL and .NET, and your cultural fit within the team.

This visual timeline outlines the typical progression from the initial recruiter screen to the final panel interviews. Use this to pace your preparation, focusing heavily on standard Data Structures and Algorithms (DSA) for the middle stage, and pivoting to deep, domain-specific trivia and system architecture for the final rounds. Note that timelines can occasionally stretch, so patience and proactive follow-ups are beneficial.

To excel in the AvidXchange interview process, you must be prepared to navigate distinct technical and behavioral evaluation areas. The process is bifurcated between standardized algorithmic testing and practical, domain-specific engineering discussions.

Data Structures and Algorithms (The Karat Interview)

The most critical hurdle for many candidates is the outsourced Karat interview. This area tests your raw coding speed, accuracy, and foundational computer science knowledge. Strong performance means solving at least two, ideally three, problems within a strict 45-minute window.

Be ready to go over:

• Graph Traversal – Deep understanding of Depth-First Search (DFS) and Breadth-First Search (BFS) is frequently tested.

As a Software Engineer at AvidXchange, your day-to-day work is centered around building, optimizing, and maintaining the systems that power B2B payment automation. You will be responsible for developing scalable backend services, frequently utilizing C# and .NET, while also managing frontend components using modern JavaScript frameworks.

A significant portion of your time will be spent interacting with databases. You will write, review, and optimize complex SQL queries to ensure that large volumes of financial data are retrieved and processed efficiently. Because performance is critical in financial technology, you will constantly monitor system health and refactor legacy code to improve execution speed and reduce technical debt.

Collaboration is a daily requirement. You will work alongside product managers to understand new feature requirements, coordinate with QA engineers to ensure robust test coverage, and partner with DevOps teams to streamline deployment pipelines. You will also participate in daily stand-ups, architecture review meetings, and code reviews, ensuring that all code adheres to AvidXchange's strict security and quality standards.

To be a competitive candidate for the Software Engineer position at AvidXchange, you must possess a blend of strong algorithmic thinking and practical, stack-specific experience. The company looks for engineers who can hit the ground running while adapting to their established engineering culture.

• Must-have technical skills – Deep proficiency in SQL (especially complex querying and indexing), strong foundational knowledge of Object-Oriented Programming (OOP), and hands-on experience with either .NET/C# or JavaScript (specifically asynchronous programming).
• Must-have problem-solving skills – Demonstrated ability to pass rigorous Data Structures and Algorithms assessments (Leetcode easy/medium) and design logical RESTful APIs.
• Nice-to-have skills – Experience with DevOps principles, CI/CD pipelines, cloud infrastructure (Azure/AWS), and a background in SaaS or financial technology (FinTech).
• Experience level – Typically requires a Bachelor's degree in Computer Science or a related field, with experience ranging from strong entry-level candidates to mid-level engineers, depending on the specific team's needs.
• Soft skills – Excellent communication skills, the ability to advocate for your technical decisions, and the patience to navigate complex, sometimes ambiguous interview scenarios and organizational processes.

Q: How difficult is the Karat technical interview? The Karat interview is generally considered to be of average difficulty, consisting of Leetcode easy to medium questions. The real challenge is the pace; you are expected to complete up to three questions in 45 minutes, meaning you must write working code quickly and efficiently.

Q: Why does AvidXchange outsource their initial technical screen? Outsourcing to Karat allows AvidXchange to standardize the technical evaluation process, ensuring every candidate is tested on a baseline of algorithmic and API design skills before utilizing internal engineering hours. It is by design highly scripted and objective.

Q: I haven't heard back from the recruiter after my interview. Is this normal? Unfortunately, candidates frequently report communication delays or "ghosting" from the recruiting team. This is often due to high application volumes. It is highly recommended to follow up politely but persistently if you do not hear back within a week of your interview.

Q: Will the final rounds involve live coding? Yes, the final rounds with AvidXchange engineers typically include a live coding or screen-sharing component. This is often focused heavily on SQL (such as writing queries under specific constraints) rather than algorithmic puzzles.

Q: Do I need extensive FinTech experience to be hired? While having a background in FinTech or B2B SaaS is a strong nice-to-have, it is not strictly required. AvidXchange is primarily looking for strong software engineering fundamentals, though you should make an effort to understand their business model before the interview.

• Master the "No Aggregate" SQL Constraint: Prepare specifically for the common AvidXchange technical test where you must write complex SQL queries without using standard aggregate functions. Brush up on self-joins and subqueries.
• Drive the Karat API Questions: The API design questions in the Karat round can sometimes feel poorly constructed or lacking context. Do not guess; actively ask the interviewer clarifying questions to define the scope before you start answering.
• Prepare Your "Why AvidXchange?" Narrative: The initial HR screen will heavily focus on your motivations. Have a clear, articulate answer ready that demonstrates you understand their position in the B2B payment automation space.
• Speak to DevOps and Full Lifecycle: AvidXchange values engineers who understand what happens to their code after it is merged. Be prepared to discuss CI/CD, deployment strategies, and basic infrastructure concepts.
• Manage Your Expectations on Communication: Go into the process knowing that recruiter communication might be slow. Do not let a lack of immediate feedback discourage you; stay professional and follow up on your own timeline.

Securing a Software Engineer role at AvidXchange is an opportunity to build mission-critical software that drives the financial operations of countless businesses. The interview process is rigorous and multi-faceted, requiring you to pivot from the rapid-fire algorithmic problem-solving of the Karat interview to deep, nuanced discussions about SQL, .NET, and system architecture with internal engineering teams.

This compensation data provides a baseline expectation for the role. Keep in mind that actual offers will vary based on your specific experience level, your performance during the technical rounds, and your location. Use this information to anchor your expectations and prepare for future negotiation conversations.

By focusing your preparation on the specific constraints of the process—mastering Graph/DFS algorithms, practicing complex SQL queries without aggregate functions, and refining your system design communication—you will position yourself as a highly competitive candidate. Approach the process with patience, confidence, and a clear understanding of the value you can bring to their engineering organization. For more insights, practice scenarios, and peer experiences, continue exploring resources on Dataford to ensure you are fully prepared for interview day. You have the skills to succeed; now it is time to execute.