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Roberto Fajardo Duro

@robertofajardoduro

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Data Engineer | On-chain & financial data pipelines | Python, SQL, dbt, AWS | Remote from Madrid (CET)

Spain

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What I'm looking for

Remote data engineering on financial and on-chain data: pipelines, modelling, and the data quality underneath. I come from credit risk in a regulated bank and tax-grade reconciliation of DeFi positions, where a wrong number has consequences. Happy owning a platform end-to-end or as the analytics engineer closest to the business. Small, remote-first, EU timezone.

Data engineer with 5+ years across regulated banking and on-chain finance, building pipelines for financial data that has to hold up to scrutiny.

At Banco Sabadell I renewed the internal manager scoring model (+15% allocation precision), validated credit risk models, and cut data processing latency by 30% on SQL/SAS workflows. In parallel, as co-founder of Orwee, I designed and operate a full-stack AWS architecture with real-time ETL pipelines ingesting 50M+ on-chain data points, serving 500+ active users with liquidity-pool discovery and concentrated-liquidity risk monitoring.

Before that I engineered wallet-level tracking of liquidity pool transactions for fiscal reporting at ChainTaxFlow (95% reporting accuracy), and built dashboards tracking 10+ DeFi protocols at Albeit Capital to drive C-level allocation decisions.

I work end-to-end: ingestion, transformation, modelling, serving, and the data quality layer underneath. Statistician by training (Complutense), MSc in Big Data. Daily user of Claude Code, Cursor and MCPs. Madrid, remote-first, CET.

Experience

Work history, roles, and key accomplishments

Current

Data Scientist & Data Hub Specialist

Current

Banco Sabadell

Sep 2024 - Present (2 years 1 month)

Renewed the internal manager scoring model in a regulated environment, increasing portfolio allocation precision by 15%. Validated credit risk models and optimised SQL/SAS data workflows, reducing data processing latency by 30%.

SQL SAS Python Credit Risk Modeling RAG Data Quality

Current

Co-Founder & Data / Tech Lead

Current

Orwee

Mar 2023 - Present (3 years 7 months)

Designed and operate a full-stack AWS architecture with real-time ETL pipelines ingesting 50M+ on-chain data points. Own the datasets and dashboards 500+ active users rely on for liquidity-pool discovery and risk monitoring.

AWS Python Data Pipelines On Chain Analytics Machine Learning Dashboarding AWS Lambda Python Programming Data Pipeline Architecture

Data Engineer

ChainTaxFlow

Feb 2025 - Jun 2025 (4 months)

Engineered wallet-level tracking of complex liquidity pool transactions for fiscal reporting, raising reporting accuracy by 95%. Deployed an AWS backend with a RAG agent for regulatory queries, cutting manual review time by 60%.

Python AWS On Chain Analytics Data Quality RAG

Data Analyst

Albeit Capital

Oct 2022 - Aug 2024 (1 year 10 months)

Streamlined 80% of recurring reporting workflows via Python ETL pipelines, boosting team efficiency by 40%. Built dashboards tracking 10+ DeFi protocols to drive C-level allocation decisions.

Python ETL SQL Power BI Metabase Data Visualization

Freelance Data Scientist

Plutus

Nov 2023 - Jan 2024 (2 months)

Automated 80% of recurring reporting with Python-based ETLs, improving operational efficiency by 40%. Created interactive Power BI/Metabase dashboards to support C-level decisions across 10+ DeFi protocols.

Python ETL Power BI Metabase Data Visualization SQL