While every interview is unique, the questions below represent the patterns and themes commonly explored during the Data Engineer interview process at Applied Systems. Use these to guide your practice and structure your thoughts.

SQL & BigQuery Optimization

These questions test your ability to handle large-scale data efficiently and your deep understanding of BigQuery's architecture.

• Write a SQL query using window functions to find the top 3 highest-valued insurance policies per region, accounting for ties.
• How does BigQuery store data under the hood, and how do you leverage partitioning and clustering to reduce query costs?
• Walk me through a scenario where a complex CTE-heavy query was failing. How did you debug and optimize it?
• Explain the difference between a standard view, a materialized view, and a scheduled query in BigQuery. When would you use each?

Pipeline Engineering & Python

These questions evaluate your hands-on coding skills and your approach to building resilient ETL/ELT workflows.

• Write a Python script that reads a large CSV file from a cloud storage bucket, performs basic data cleansing, and loads it into a database.
• How do you handle schema evolution and bad data (e.g., malformed JSON) in a streaming data pipeline?
• Describe your approach to building a CI/CD pipeline for data infrastructure. What testing steps do you include before deploying to production?
• If a daily batch job fails halfway through, how do you ensure your pipeline is idempotent so it can be safely rerun?

Looker & BI Integration

These questions focus on your ability to bridge data engineering with business intelligence, a critical component of this role.

• How do you monitor and troubleshoot slow-loading dashboards in Looker?
• Explain the concept of Persistent Derived Tables (PDTs) in Looker. What are the risks of overusing them?
• How do you ensure that your BigQuery data models align cleanly with LookML Explores to maximize performance?

System Design & Architecture

These questions are especially relevant for Senior candidates, testing your ability to design scalable, secure data ecosystems.

• Design a real-time data ingestion architecture using GCP services to capture clickstream data and make it available for reporting within minutes.
• How would you design a Change Data Capture (CDC) system using Debezium and Kafka to sync an on-premise SQL Server database to a cloud data lake?
• What are the key security and IAM considerations you implement when setting up a new data warehouse environment?

6. Key Responsibilities

As a Data Engineer at Applied Systems, your day-to-day work revolves around building and maintaining the connective tissue between our raw data sources and our business intelligence platforms. You will spend a significant portion of your time designing and deploying scalable ETL/ELT pipelines using GCP native services like BigQuery, Pub/Sub, and Dataflow. This involves not only writing the code but also automating its deployment using Terraform, Kubernetes, and Helm, ensuring our infrastructure remains robust and reproducible.

Collaboration is a massive part of this role. You will work closely with data analysts, software engineers, and product managers across the EZLynx team to understand reporting needs and translate them into efficient, logical data models. When business users report slow dashboards, you will dive into Looker and BigQuery to diagnose and address performance issues in LookML codebases, Explores, and derived tables, ensuring our datasets are backed by highly performant queries.

For those stepping into the Senior Data Engineer level, your responsibilities will expand to include significant architectural oversight. You will assess the risks and opportunities of various technical solutions, guiding the team's decisions on scalability and security. You will also champion continuous improvement, refining our internal processes, optimizing complex data lake operations, and mentoring team members as we evolve our data infrastructure over time.

7. Role Requirements & Qualifications

To thrive as a Data Engineer at Applied Systems, you need a strong blend of cloud infrastructure knowledge, data modeling expertise, and software engineering discipline.

• Must-have technical skills – You must have 3+ years of hands-on experience with Google BigQuery for data warehousing and a solid grasp of the broader GCP ecosystem (Pub/Sub, Dataflow, Cloud Functions, IAM). Proficiency in writing and optimizing complex SQL (including window functions and stored procedures) is non-negotiable. You also need strong scripting skills in Python or Bash and experience building ETL pipelines for large datasets.
• Must-have operational skills – Experience with CI/CD pipelines (GitHub Actions, Jenkins), version control (Git), and data modeling best practices (star/snowflake schemas) is required. You must also have experience managing Looker environments and diagnosing BI performance issues.
• Nice-to-have skills – Familiarity with Change Data Capture (CDC) tools like Debezium or Kafka, experience with Go programming, and hands-on proficiency with Kubernetes and Terraform will make your application stand out significantly.
• Senior-level expectations – If applying for the Senior role, you must bring 5+ years of BigQuery experience, advanced Python and SQL optimization skills, and a proven track record of making architectural decisions that impact data lake operations and security.
• Soft skills – The ability to work cross-functionally in an agile, fast-paced environment is essential. You must be a strong communicator who can translate technical constraints to non-technical stakeholders and champion best practices across the team.

8. Frequently Asked Questions

Q: How difficult is the technical interview process? The technical rounds are rigorous but practical. We do not focus on obscure algorithmic brainteasers; instead, we test your ability to write clean Python, optimize complex SQL, and design realistic cloud architectures. Expect to spend a solid week or two brushing up on BigQuery optimization, LookML concepts, and GCP services.

Q: What is the difference between the mid-level and senior-level interviews? While both levels test core engineering skills, Senior candidates will face much deeper system design questions. Senior interviews focus heavily on your ability to evaluate trade-offs, design secure data lake architectures, and demonstrate how you have mentored teams and improved internal engineering processes.

Q: Does this role require being in an office? No, this position offers significant flexibility. You can choose to work fully remotely within the United States or from an Applied Systems office. We flex our time together and collaborate effectively across distributed teams.

Q: What is the culture like on the EZLynx data team? The culture is highly collaborative, agile, and values-driven. We believe that you are a teammate, not just an employee. You will find a fast-paced environment where trying new things is encouraged, and where cross-functional collaboration with analysts and software engineers is a daily reality.

Q: How long does the entire interview process usually take? Typically, the process takes about 3 to 4 weeks from the initial recruiter screen to an offer decision, depending on scheduling availability for the virtual onsite loop.

9. Other General Tips

• Think in "Cloud Native" Terms: When answering architecture questions, default to GCP-native solutions (like Pub/Sub, Dataflow, and BigQuery) as outlined in the job description. Show that you understand the Google Cloud ecosystem deeply, rather than just generic data engineering concepts.

• Brush Up on Looker: Many Data Engineers focus solely on the backend. Because managing the Looker instance is a core responsibility here, reviewing LookML best practices, PDT management, and dashboard performance tuning will give you a massive advantage over other candidates.
• Showcase Your DevOps Mindset: Applied Systems values automation. Whenever discussing pipelines, proactively mention how you would use Terraform for infrastructure, Kubernetes for deployment, and GitHub Actions for CI/CD. Treat data like software.
• Emphasize Business Impact: We build software for the insurtech industry. When discussing past projects, frame your technical achievements in terms of business outcomes—how your pipeline reduced reporting latency, saved cloud costs, or enabled better decision-making for stakeholders.

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10. Summary & Next Steps

Joining Applied Systems as a Data Engineer is a unique opportunity to shape the data landscape of a leading insurtech company. You will tackle complex challenges involving massive datasets, cloud-native architectures, and critical BI integrations. By bringing your expertise in GCP, BigQuery, and pipeline automation to the EZLynx team, you will directly empower the organization to make faster, more reliable data-driven decisions.

This salary module provides the targeted starting base range for this position in the United States. Keep in mind that your actual offer will consider your depth of experience, specific skill set, and whether you are stepping into the mid-level or senior-level role, with additional eligibility for bonus plans.

To succeed in your interviews, focus your preparation on the intersection of data architecture and software engineering. Practice writing and optimizing complex SQL, review your GCP service architectures, and be ready to discuss how you automate and monitor data pipelines from end to end. Remember that we are looking for collaborative problem-solvers who are excited to learn and grow within an agile team.

You have the skills and the background to make an impact here. Review the concepts outlined in this guide, leverage additional resources on Dataford to refine your technical communication, and approach your interviews with confidence. We look forward to learning more about you and exploring how you can help us create amazing career moments at Applied Systems.