At Handshake, the mission is to democratize opportunity and help millions of students launch their careers, regardless of their background or connections. As a Data Engineer, you are the architect of the data foundation that makes this mission possible. You will design, build, and maintain the highly scalable pipelines and data systems that connect students, university career centers, and employers across the globe.

Your work directly impacts Handshake’s core products, from powering personalized job recommendations to enabling robust search engines and building advanced analytics platforms for employers. Because the platform processes vast amounts of sensitive student, academic, and professional data, your role is critical in ensuring data quality, security, and high availability. You will tackle complex problems involving high-throughput streaming data, complex entity resolution, and large-scale batch processing.

This role is both technically rigorous and deeply impactful. You will work in a highly collaborative environment alongside data scientists, product managers, and software engineers to turn raw, diverse datasets into structured, actionable insights. For a candidate who thrives on solving scale challenges and building clean, maintainable systems, this position offers an exciting opportunity to shape the future of early-career recruiting.

To succeed in the Handshake interview process, you must be prepared for a variety of technical and behavioral questions. The questions below are representative of what candidates have encountered in real interviews. They are designed to test your technical competence, architectural thinking, and alignment with the company's collaborative culture.

Coding and Problem Solving

These questions evaluate your fluency in core programming languages, algorithmic thinking, and your ability to write clean, optimized code.

• Write a clean Python script to parse and transform a nested JSON payload representing student profiles into a flat structure.
• Given an input stream of job application events, how would you deduplicate the data in real-time?

Preparing for the Data Engineer interview requires a balanced approach that covers core technical skills, architectural design, and behavioral alignment. You should focus on demonstrating not just your technical capabilities, but also your structured thinking and communication skills.

Technical Rigor – You must demonstrate deep proficiency in SQL and at least one programming language, preferably Python or Scala. Interviewers will evaluate your ability to write clean, modular, and well-documented code that handles edge cases gracefully.

Problem-Solving & Architecture – You need to show that you can design scalable, fault-tolerant data pipelines and storage solutions. Be prepared to explain your design choices, discuss trade-offs, and demonstrate a strong understanding of data modeling concepts like Star and Snowflake schemas.

Collaboration & Communication – Throughout the process, you will interact with cross-functional team members and leadership. You must be able to explain complex technical concepts clearly and demonstrate that you can collaborate effectively to solve business problems.

Mission Alignment – Handshake is a mission-driven company. You should be prepared to discuss why you want to work at the company and how your personal values align with their goal of helping students launch successful careers.

The interview process at Handshake is highly structured, thorough, and designed to evaluate both your technical capabilities and cultural alignment. Candidates consistently report that the process is well-thought-out, relevant to the daily responsibilities of a Data Engineer, and free of trick questions or "gotchas." The recruiting team acts as your advocate, providing clear expectations and guidance at each stage.

The process typically begins with an initial recruiter call to discuss your background and assess overall alignment. This is followed by a technical screening phase, which may include a take-home assignment and a technical phone screen with a hiring manager. The final stage is a comprehensive onsite interview panel that covers coding, systems design, and behavioral evaluations.

The visual timeline above outlines the typical progression of the Handshake interview pipeline. Candidates should use this timeline to plan their preparation, ensuring they dedicate sufficient time to the take-home assignment and system design concepts before reaching the final onsite loop. While the overall structure remains consistent, some variation may occur based on the specific team or level of seniority.

To excel in the Handshake interview, you must understand the specific competencies that interviewers are evaluating during each session.

Coding & Data Structures

This area focuses on your ability to write clean, maintainable, and efficient code to manipulate and transform data. Interviewers want to see that you can translate logical requirements into working code while considering performance and edge cases.

Be ready to go over:

• Data manipulation – Transforming nested structures, handling null values, and parsing complex data formats like JSON or XML.
• Algorithm design – Selecting and implementing the correct algorithms and data structures to solve data processing challenges.
• Code cleanliness – Writing modular, readable, and well-commented code that adheres to industry best practices.
• Advanced concepts (less common) – Generator functions for memory management, custom decorators, and multi-threading or multi-processing in Python.

Example questions or scenarios:

• Write a Python script to parse a directory of raw JSON logs, extract specific key-value pairs, and aggregate the results by hour.
• Implement a custom deduplication algorithm that processes a list of student profiles and merges duplicates based on specific matching rules.

Systems Design & Data Architecture

This evaluation area assesses your ability to design scalable, reliable, and cost-effective data infrastructure. You will be asked to architect systems that can handle large volumes of data while meeting specific business requirements.

Be ready to go over:

• Pipeline orchestration – Designing robust batch and streaming workflows using tools like Apache Airflow or Prefect.
• Data warehousing – Modeling data using dimensional design principles (Star and Snowflake schemas) for optimal query performance.
• Scalability and reliability – Designing systems that can scale horizontally and handle failures gracefully through retries and alerting.
• Advanced concepts (less common) – Idempotency in pipeline design, complex backfilling strategies, and data lakehouse architectures.

Example questions or scenarios:

• Design a data pipeline that ingests real-time job application events, processes them, and loads them into Snowflake for analyst consumption.
• Architect a system to handle schema changes in upstream transactional databases without breaking downstream analytical pipelines.

Take-Home Presentation & Code Quality

If you choose the take-home assignment, you will be evaluated on the quality of your solution and your ability to present and defend your design decisions. Interviewers look for clean, layered architecture and clear documentation of your assumptions.

Be ready to go over:

• Code structure – Organizing your code into logical layers, such as data ingestion, transformation, and output.
• Documentation – Writing comprehensive README files that explain how to run your code, your design choices, and your assumptions.
• Presentation skills explaining your solution clearly to both technical and non-technical stakeholders during the onsite extension.
• Advanced concepts (less common) – Implementing unit test suites, setting up basic CI/CD configurations, and analyzing the time and space complexity of your solution.

Example questions or scenarios:

• Present your take-home project solution to the team, explaining why you chose specific data structures and how you would scale the solution to handle 10x the data volume.
• Discuss the trade-offs you made during the take-home assignment regarding code simplicity versus performance.

As a Data Engineer at Handshake, your primary responsibility is to design, build, and maintain the data infrastructure that powers the platform's ecosystem. You will work on a variety of projects, from developing robust ETL/ELT pipelines to optimizing data warehouse performance and supporting advanced machine learning initiatives.

You will collaborate closely with product managers, data scientists, and software engineers to understand data requirements and translate them into scalable technical solutions. Your work will ensure that data is accurate, accessible, and secure, enabling the business to make data-driven decisions and deliver personalized experiences to millions of users.

Additionally, you will play a key role in driving data engineering best practices across the organization. This includes mentoring junior engineers, conducting code reviews, and continuously evaluating and adopting new technologies to improve the efficiency and reliability of Handshake's data platform.