You're seeing this page as if you were . The main menu is still yours, though. Exit from immersion
Mayela ZambranoMZ

Mayela Zambrano

Data Engineer | UX Strategist and Researcher

€350/day
Valencia, ES
3-7 years

Average response time: 1 hour

About Mayela

I build dashboards that reveal hidden revenue leaks in your operations.
I help non-technical teams finally understand their numbers.
I combine data engineering skills (so your data flows smoothly) with UX research expertise (so your dashboards are easy to use, not overwhelming).
  • English

    Native or bilingual

  • Spanish

    Native or bilingual

  • French

    Conversational

  • Italian

    Fluent

Can work on-site
Valencia (up to 50km)

Experience

  • Centric Consulting
    Sr. Consultant Data Engineer (Remote)
    July 2024 - March 2025 (8 months)
    • Led migration of an on-prem warehouse toward Azure Fabric Lakehouse, orchestrating pipelines that called partner APIs and landed Parquet files for downstream transformations. Implemented medallion architecture (bronze/silver/gold) with PySpark for scalable, testable ELT.
    • Built enterprise Power BI dashboards for executive leadership and aligned data models to KPIs to enable self-service analytics.
    • Drove data modeling standards and performance tuning across Fabric Lakehouse tables to keep refreshes predictable at scale.
    User Research
  • Kalos
    Business Systems Analyst
    February 2024 - September 2024 (7 months)
    Helped research systems within the company and improve processes for carrying out their day-to-day operations
    User Research User Interface Design Business analysis
  • Centene Corporation
    Sr. Data Engineer (Healthcare)
    DIGITAL AND IT
    June 2021 - July 2024 (3 years and 1 month)
    St. Louis, MO, USA
    • Ingested and organized healthcare data from Kafka streams and batch sources into the enterprise data warehouse, normalizing into Teradata with domain-specific schemas (tables, views, stored procedures).
    • Integrated upstream Informatica ETL feeds and maintained subject-area databases for business units; enforced data contracts and lineage.
    • Scheduled and monitored pipelines with Control-M, improving on-time SLAs and incident response.
    • Delivered and maintained MicroStrategy and Power BI dashboards; managed 10+ dashboards used by 100+ stakeholders and reduced reporting errors by ~40% via data quality checks and DQ monitors.
    • Partnered with analysts and product owners to translate business rules into robust SQL/PySpark transformations and semantic models.

Recommendations

Be the first to recommend Mayela

Help this freelancer shine by sharing your experience working together.

These freelancer profiles also match your criteria

AgathaA

Agatha Frydrych

Backend Java Software Engineer

4.7

(3)

2

BaptisteB

Baptiste Duhen

Fullstack developer

4.6

(4)

5

AmedA

Amed Hamou

Senior Lead Developer

4

(2)

7

AudreyA

Audrey Champion

Web developer

4.3

(3)

4

Education

  • Ph.D.
    Linguistics, University of Iowa
    2020
    Ph.D.
  • SAFe® 5 Scrum Master.
    SAFe® 5 Scrum Master.

Skill set

Categories