Open to Analytics Engineer roles in Barcelona or remote. Authorized to work in Spain, and open to contract work.

Alexander Campos

I'm an analytics engineer in Barcelona. I build data and AI tools, and I care a lot about getting the numbers right.

See my work Email me

I've worked with data for over four years. At Lynxus Solutions in Medellín, I ran the weekly business reviews for our logistics clients. Then I spent two years on marketing analytics for Fabletics and Yitty. Since December 2025, I've been building Velur on the side.

Experience

Junior Data AnalystLynxus Solutions, MedellínNov 2021
Promoted to Data Analyst, 8 months inLynxus SolutionsJul 2022
Marketing Data AnalystFabletics & Yitty (remote contract, El Segundo, CA)Mar 2023 to Jun 2025
Started VelurA side project, BarcelonaDec 2025
Velur live on the Shopify App StoreVelurOct 2026

Projects

VelurA daily revenue brief for Shopify and subscription brands, which I'm building on my own as a side project. It's live on the Shopify App Store. Claude writes the explanation and never calculates a number, and every number it writes is checked against the data.

Velur ↗

Fabletics & YittyMarketing Data Analyst for Fabletics and Yitty, two membership-based fashion e-commerce brands, for over two years. New VIP promos launched every 7 to 10 days, and I reported on each one.

Fabletics ↗Yitty ↗

Lynxus SolutionsI owned the Weekly Business Review for our transportation and logistics clients at Lynxus Solutions. I replaced manual report prep with Python and SQL, which cut reporting errors by 30%.

Lynxus Solutions ↗

Skills

Data engineering

SQL, advanced
Python: Pandas, NumPy
ELT and data modeling (raw → staging → marts)
Metrics layer with versioned definitions
Idempotent syncs
Data quality testing: golden numbers, tenant isolation, schema drift in CI

Analytics

A/B testing and experimentation
Customer segmentation
Conversion and behavior analysis
Campaign post-mortems
E-commerce and subscription metrics: revenue, MRR, repeat rate, ROAS
Weekly Business Reviews and stakeholder reporting
Promo performance and VIP membership analytics
E-commerce merchandising: inventory, sizing, taxonomy, site QA

AI

Claude Code and the Claude API, every day
Agent skills and MCP workflows
Prompt engineering: prompts versioned and reviewed like code
Verifying every number in LLM output against the source data
Sending only aggregated data to models

Product and engineering

API connectors: OAuth, token refresh, incremental syncs
Scheduling and monitoring: timezone-aware jobs, health alarms
Data security: row-level security, EU hosting
Customer discovery and roadmap prioritisation
Product specs, ADRs and decision documentation

Engineering: TypeScript, Next.js, Supabase Postgres, Resend, Vercel, GitHub Actions
BI: Power BI, Looker
DTC data: Shopify, Stripe, Recharge, Meta Ads, Google Ads
Claude: MCP, CLI, skills, Design, Research
Research: AI research tools
Work: Jira, Confluence, Asana, Notion, Microsoft Office, Google Suite
Working knowledge: dbt, Snowflake, HubSpot, Salesforce
Languages: Spanish (native), English (fluent), Dutch (A1)

Certificates

SAS Visual Business AnalyticsSAS

Algebra: Elementary to AdvancedJohns Hopkins University

Python for Data Science, AI & DevelopmentIBM

Data Science MethodologyIBM

Tools for Data ScienceIBM

Perform Analyses & Build Reports using SAS Visual AnalyticsSAS