Hi, and welcome to my personal site! I’m Daniela Fernandez Espinosa, a senior data engineer with over 8 years of experience, based in the Bay Area. I’m passionate about all things data, a self-proclaimed data geek, and an amateur runner in my spare time.
Latest from the Blog
Here’s to Second Chances: How I Became a College Athlete at 33
Progress is not linear, but every road leads somewhere. Three years ago, August 2023, I joined my brother for his weekly workouts at Town Athletics, a local running studio in Oakland focused on running fitness. I really enjoyed those sessions, not only because they were different from my regular routine (3 easy miles around Lake…
Back to the Basics: Refreshing Some System Design Concepts
Databases SQL vs NoSQL databases: When to use Relational Database: Data is well structured with clear relationships Strong consistency and transactional integrity When to use Non-Relational Database: Super low-latency for rapid responses Data is unstructured or semi-structured Scalable storage for massive data volumes Scaling Vertical Scaling (Scale Up) Adding more resources to our existing servers.…
Defining scope and constraints for Data Engineering pipelines
When we are designing data pipelines, it is important to start by asking the following questions: 1. Requirements and Goals What is the primary goal of this pipeline? Structured data: Data that is organized in a fixed schema Semi-structured: Data that doesn’t follow a rigid schema but still has some organizational markers Unstructured: Data that…
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