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Costrategix Interview Questions

A/B Testing

Algorithms

Analytics

Machine Learning

Probability

Product Metrics

Python

Statistics

Costrategix Interview Guides

Suppose there exists a new airline named Jetco that flies domestically across North America. Jetco recently had a study commissioned that tested the boarding time of every airline, and it came out that Jetco had the fastest average boarding times of any airline.

What factors could have biased this result, and what would you look into?

What could potentially bias the average boarding time in favor of an airline that only flies domestically?

What could potentially bias the average boarding time in favor of an airline that only flies domestically?

Boarding Times Bias

A new airline came out as the fastest average boarding times compared to other airlines.  What factors could have biased this result and what would you look into?

You are testing hundreds of hypotheses with many t-tests. What considerations should be made?

What is a key disadvantage of the F-test when compared to multiple t-tests?

What is a key disadvantage of the F-test when compared to multiple t-tests?

Hundreds of Hypotheses

You are testing hundreds of hypotheses with many t-tests. What considerations should be made?

In an A/B test, how can you check if assignment to the various buckets was truly random?

In an A/B test, which of the following is a common method to determine if the assignment to the test groups was truly random?

In an A/B test, which of the following is a common method to determine if the assignment to the test groups was truly random?

Random Bucketing

A/B Testing & Experimentation

SummarySince 2006, CoStrategix has defined and implemented digital transformation initiatives, data and analytics capabilities, and digital commerce solutions for Fortune 500 and mid-market customers. CoStrategix provides thought leadership, strategy, and comprehensive end-to-end technology execution to help organizations transform and stay competitive in today’s digital world. As a Gixer (employee) at CoStrategix, you will have broad exposure to diverse industries and technologies. You will work on leading-edge digital projects in areas of Data Engineering, Data Governance, Data Strategy, AI, Cloud,. Gixers operate at the leading edge of technologies, and our projects require compelling human interfaces and modern data platforms. This role is based at our culture hub in Blue Ash, Ohio. About this role:As a Data Architect at CoStrategix, you will define, orchestrate, and implement modern data platforms and architectures. This role is about understanding the current state of data ecosystems, mapping existing data flows and structures, creating an architectural blueprint, and then implementing data strategies and governance frameworks in rapid cycles. In this role, you will provide the following: Strategic & Consultative Responsibilities<ol><li>Act as a trusted data advisor to client stakeholders, clearly communicating trade-offs, guiding decision-making, and influencing the adoption of modern data practices.</li><li>Lead stakeholder interviews and working sessions to elicit requirements, clarify use cases, and align on priorities, scope, and success metrics.</li><li>Create phased data roadmaps with clear milestones, dependencies, and value outcomes (e.g., time-to-insight, cost reduction, risk reduction) and track progress against them.</li><li>Provide architectural input into scoping and pricing of data engagements; ensure solutions balance value, risk, and cost, and support delivery teams in staying aligned to scope and architectural guardrails.</li><li>Work closely with sales and account teams to understand customer objectives and translate them into practical, scalable data architecture and solution designs.</li><li>Participate in pre-sales engagements, discovery workshops, proposal development, client presentations, and proof-of-concept activities to showcase solution feasibility and value.</li></ol> Data Governance, Quality & Operating Model<ol><li>Bring consultative competencies around data governance and data quality, helping clients define guiding principles, policies, and operating models.</li><li>Lead development of comprehensive data strategies for clients that align with their business priorities.</li><li>Design processes for metadata management, lineage tracking, and master data management (MDM), including stewardship roles and workflows.</li><li>Establish and maintain data quality standards, metrics, and monitoring processes to ensure accurate, complete, and timely data across critical domains.</li><li>Develop semantic models and curated datasets, guide adoption of data cataloging and data literacy programs.</li></ol> Enterprise & Solution Architecture<ol><li>Design and maintain conceptual, logical, and physical data architectures to support enterprise, analytical, and operational systems.</li><li>Assess and recommend data platforms, cloud services, and emerging technologies to meet business needs, while collaborating with Cloud, DevOps, and Security Architects to ensure architectural alignment.</li><li>Partner with Data Analysts, BI Developers, and Data Scientists to ensure data architectures enable analytics, visualization, and AI/ML initiatives.</li><li>Define non-functional requirements (performance, scalability, resilience, cost, security, and compliance) for data solutions, and ensure they are addressed in the architecture and design.</li><li>Maintain architecture decision records, reference architectures, and reusable patterns; define and promote standards and best practices for data modeling, integration, and consumption across teams.</li></ol> Implementation, Delivery & Enablement<ol><li>Lead the implementation of scalable, secure, and high-performing data and transformation frameworks that unify data across platforms and enable real-time, batch, and event-driven use cases.</li><li>Define and enforce data design standards, patterns, and best practices during implementation to ensure consistency, maintainability, and performance.</li><li>Mentor and coach engineering and analytics teams in data design principles, governance frameworks, and architectural discipline to ensure consistency and quality in delivery.</li></ol> Qualifications:<ol><li>Bachelor's Degree in Math, Statistics, Computer Science, Information Technology, or a related field</li><li>8+ years of experience in data management and architecture roles</li><li>3 to 5 years of leading data strategy, governance, or modernization efforts</li><li>3 to 5 years of pre-sales, client solutioning, and/or consulting engagement in Data Management</li><li>Experience designing and implementing modern data architectures</li><li>Current understanding of best practices regarding data security, governance, and regulatory compliance</li><li>Experience in data modeling, data engineering, and analytics platform architecture</li><li>Experience with data engineering tooling such as Databricks, Snowflake, Synapse, BigQuery, Kafka, and dbt</li><li>Experience with software development, DevOps best practices, and automation methodologies</li><li>Excellent leadership and negotiation skills are necessary to work effectively with colleagues at various levels of the organization and across multiple locations</li><li>Communicate complex issues crisply and concisely to various levels of management</li><li>Coaching and mentoring skills – ability to adapt to all levels of the organization</li><li>Strong collaboration skills and excellent verbal and written communication skills</li></ol> About CoStrategixWe make CoStrategix an awesome place to work, offering a total rewards package that includes comprehensive benefits starting on day one. Benefits include medical, dental, vision, disability, and life insurance, as well as an EAP and 401(k) retirement plan. We are a flexible hybrid workplace committed to a culture of curiosity, collaboration, learning, self-improvement, and, above all, fun. We have been named a finalist for the Cincinnati Business Courier's Best Places to Work Awards for 4 consecutive years. Do the Right Thing. Always.At CoStrategix, we are passionate about our core values. Diversity, equity & inclusion (DE&I) are part of our core values Every Gixer (employee) has an opportunity for success regardless of their race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws. Creating an environment where everyone, from any background, can do their best work is the right thing to do.

Question	Topic	Difficulty	Ask Chance
Boarding Times Bias	Statistics	Medium	Very High
Hundreds of Hypotheses	Statistics	Medium	Very High
Random Bucketing	A/B Testing & Experimentation	Medium	Very High

Costrategix Interview Questions

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