Revolut Data Engineer interview questions & guide 2026

The following questions are representative of the patterns observed in recent Revolut interview cycles. While exact questions vary by team, these reflect the core competencies the hiring team prioritizes.

Technical Proficiency: Python and SQL

These questions assess your ability to write clean, efficient code and perform complex data transformations. Expect a focus on performance optimization and handling large datasets.

• How would you optimize a slow-running SQL query involving multiple joins and large tables?
• Write a Python script to parse a large JSON file and load it into a data warehouse.

Preparation for Revolut requires a balance of deep technical mastery and a pragmatic, problem-solving mindset. You should be prepared to discuss not just "how" you solve a problem, but "why" your chosen approach is the most efficient.

Technical Depth – You must demonstrate a high level of proficiency in Python and SQL. Interviewers will look for your ability to write production-ready code that is both readable and highly performant.

System Design Thinking – You will be evaluated on your ability to design end-to-end data systems. Focus on scalability, fault tolerance, and the ability to handle data at high velocity.

Analytical Rigor – Revolut values data-driven decision-making. Be prepared to explain how you validate your data and how you ensure that your engineering solutions directly support business requirements.

The Revolut interview process is rigorous and designed to evaluate your technical capabilities and cultural alignment across multiple dimensions. You should expect a structured flow that moves from initial screening to intensive technical assessment. The process is characterized by its focus on practical skills, often involving live coding and deep-dive technical discussions with engineers and hiring managers.

This timeline outlines the typical progression from an initial recruiter screen to technical evaluation rounds. Use this structure to pace your preparation, ensuring you have dedicated time for both coding practice and system design theory. Remember that technical rounds are often conducted back-to-back, so managing your energy and maintaining focus is essential.

SQL and Data Transformation

This is a core component of the Data Engineer role. You are expected to demonstrate expert-level knowledge of SQL, including window functions, complex joins, and query optimization.

Be ready to go over:

• Advanced SQL syntax and query optimization techniques.
• Data modeling for analytical workloads (star schema vs. snowflake).

As a Data Engineer, your primary objective is to ensure that data is reliable, timely, and accessible. You will spend your day designing and implementing ETL/ELT pipelines that ingest data from various sources into the Revolut data lake. You will collaborate closely with Data Scientists and Product Managers to understand their data requirements and translate them into robust engineering solutions.

Beyond pipeline development, you will be responsible for monitoring system performance and ensuring high availability. You will proactively identify bottlenecks and implement optimizations to keep the data infrastructure running smoothly. This role also involves working with cross-functional teams to troubleshoot data quality issues and participate in architecture reviews to drive continuous improvement of the data platform.

A strong candidate for this role possesses a blend of deep technical expertise and a proactive, ownership-driven mindset.

• Must-have skills: Advanced proficiency in SQL and Python, experience with cloud platforms (e.g., AWS, GCP), and a strong understanding of distributed systems and data modeling.
• Nice-to-have skills: Experience with stream-processing technologies (e.g., Kafka, Flink), knowledge of containerization (Docker, Kubernetes), and familiarity with CI/CD pipelines.

Q: How long does the interview process typically take? The process varies, but it is generally efficient. Expect the entire cycle to span several weeks from the initial recruiter call to the final decision.

Q: Is the technical coding portion done on a whiteboard or in an IDE? You will likely use a shared online coding environment that mimics a real IDE, allowing you to run and test your code during live sessions.

Q: What is the most common reason candidates fail the technical rounds? The most frequent cause is a lack of focus on performance optimization. Candidates often provide a solution that works, but it isn't scalable enough for the massive data volumes Revolut handles.

• Focus on performance: In every coding or design task, always ask yourself, "How does this perform at scale?"
• Structure your answers: Use the STAR method (Situation, Task, Action, Result) for behavioral questions to keep your responses concise and impactful.
• Be prepared to pivot: The interview process is flexible; if you struggle with one team, you may still be considered for another, so keep a positive, professional attitude throughout.
• Ask meaningful questions: Use the time at the end of the interview to ask about the team’s current data challenges or the infrastructure roadmap.

The Data Engineer position at Revolut is an incredible opportunity to work at the cutting edge of global fintech. By focusing on your technical foundations in Python and SQL, and sharpening your ability to design scalable systems, you will be well-positioned to succeed.

Prepare thoroughly, stay calm during technical assessments, and remember that Revolut values candidates who take ownership and demonstrate a deep commitment to excellence. You have the skills to make a significant impact here—approach your interviews with confidence and clarity.