Preparing for an interview at Proxiad requires a dual-focus strategy: you must demonstrate rock-solid technical fundamentals while showcasing the adaptability required of an IT consultant. Because Proxiad services a wide range of external clients, interviewers are looking for engineers who can seamlessly integrate into existing client teams and deliver value from day one.

When preparing, focus on the following key evaluation criteria that the hiring team uses to assess candidates:

Technical Core Competency – You must show a deep, rather than superficial, understanding of your primary development stack. For backend roles, this means being ready to explain the inner workings of Java, Spring Boot, and relational databases rather than just reciting syntax rules.

Problem-Solving & Adaptability – Interviewers evaluate how you approach unfamiliar problems. Showing a structured, methodical thought process when writing algorithms or designing systems is just as important as arriving at the correct solution.

Consulting & Communication Skills – As a representative of Proxiad at client sites, your ability to articulate technical decisions, ask clarifying questions, and present your background clearly is highly valued.

Receptiveness to Feedback – Proxiad values continuous learning. Showing that you can accept technical feedback gracefully and use it to improve your work is a major differentiator during the technical evaluation.

The interview process at Proxiad is designed to evaluate both your technical capabilities and your alignment with client-facing consulting roles. The process generally moves at a steady pace, starting with initial screenings and progressing to deeper technical and commercial evaluations.

In many locations, particularly in France and Bulgaria, the process begins with an initial technical assessment, often hosted on platforms like CodingGame, to filter for core programming competency. If you pass this initial screen, you will move to an introductory interview with HR or a recruiter. This stage is focused on understanding your career goals, motivations, and overall fit for a consulting environment.

Following the introductory screen, you will enter the core technical evaluation. This stage typically involves a deep-dive interview with a Technical Referent or Tech Lead. They will ask theoretical questions, review your coding test, and run through architectural scenarios. In some regions, you will also meet with commercial managers or sales directors who present specific client accounts and potential missions to ensure your profile aligns with active client needs.

The timeline above represents the typical progression from your initial application to the final offer. Candidates should use this timeline to pace their technical preparation, ensuring they have fully reviewed Java and Spring fundamentals before the deep-dive technical round. Note that depending on the specific office location and client requirements, some steps may be combined or run in parallel.

To succeed at Proxiad, you must demonstrate expertise across several distinct technical and professional domains. The following sections detail exactly what the interviewers are looking for in each major evaluation area.

Java & Spring Ecosystem

The core backend stack at Proxiad heavily relies on enterprise Java technologies. Interviewers do not just want to know that you can use these tools; they want to see that you understand how they work under the hood to write highly optimized, secure code.

Be ready to go over:

• Low-Level JVM Mechanics – Garbage collection algorithms, heap and stack memory allocation, and class loading.
• Concurrency & Multithreading – Thread safety, synchronization blocks, the ExecutorService, and handling race conditions in high-throughput applications.
• Spring Boot & Hibernate Internals – Bean lifecycles, proxy mechanisms, lazy loading vs. eager loading, and avoiding the N+1 query problem.
• Advanced concepts (less common) – Reactive programming with Spring WebFlux, JVM performance tuning, and custom class loaders.

Example questions or scenarios:

• "Explain how a HashMap works internally in Java 8+ when handling hash collisions."
• "How would you configure a database connection pool in a Spring Boot application to handle sudden spikes in traffic?"
• "Walk me through the process of diagnosing and resolving a memory leak in a production Java application."

Software Architecture & Design Patterns

As a consultant, you will often help clients structure new applications or refactor legacy systems. You must demonstrate that you can write clean, maintainable, and scalable code that adheres to industry best practices.

Be ready to go over:

• Design Patterns – Practical applications of Creational, Structural, and Behavioral patterns (e.g., Singleton, Observer, Decorator).
• Relational Database Design – Schema normalization, indexing strategies, and writing high-performance SQL transactions.
• Microservices vs. Monoliths – Understanding when to decouple services, API gateway patterns, and managing distributed data consistency.
• Advanced concepts (less common) – Event-driven architecture using Kafka, CQRS (Command Query Responsibility Segregation), and containerization strategies.

Example questions or scenarios:

• "How would you design a database schema for an e-commerce platform that needs to handle rapid inventory updates?"
• "Which design pattern would you implement to allow an application to dynamically switch payment gateways at runtime?"
• "Describe how you would handle transaction rollbacks across multiple microservices."

Consulting Aptitude & Behavioral Alignment

Technical skills alone are not enough to succeed at Proxiad. Because you will represent the company directly to clients, you must show that you are professional, articulate, and capable of working under varying client guidelines.

Be ready to go over:

• Client Collaboration – How you handle changing requirements, tight client deadlines, and communication with non-technical stakeholders.
• Receiving Technical Feedback – Demonstrating a growth mindset when your code is critiqued or when adapting to a client's specific coding standards.
• Career Motivation – Why you choose consulting and how you plan to manage the transition between different project environments.
• Advanced concepts (less common) – Managing client conflict, mentoring junior developers on a client site, and contributing to pre-sales technical proposals.

Example questions or scenarios:

• "How would you handle a situation where a client insists on a technical approach that you know is inefficient or insecure?"
• "Tell me about a time you had to quickly learn a new technology or framework to deliver on a project requirement."
• "Describe a scenario where a project's requirements changed drastically mid-development. How did you adapt?"