Mikel Villota

Work Experience

1. WANNMESoftware Engineer · Madrid, SpainJul 2025 – Present

   • Worked on the Settlement Cycles domain: per-marketplace settlements plus internal management of collections and refunds, building and evolving backend services with Java and Spring Boot, and developing services for the Risk department using Python and FastAPI.
   • Drove domain boundaries, contracts, and a progressive monolith-to-microservices migration alongside another engineer without disrupting production.
   • Introduced CQRS on top of the team's hexagonal architecture where read/write separation earned its keep.
   • Refactored legacy monolith code to unblock the extraction of ~5 modules into independently scalable services.
   • Built CI/CD from scratch for new services; deployed on AWS (Elastic Beanstalk, EKS) with Kubernetes for horizontal scaling.

   Company website
2. inAtlasFreelance, in parallelData Engineer · Barcelona, SpainMar 2025 – Aug 2025

   • Designed distributed scraping pipelines with Scrapy and Playwright across 5–10 web sources, deployed on Kubernetes.
   • Automated processing through asynchronous AWS SQS queues, handling large volumes of concurrent tasks.
   • Built extraction, cleaning, transformation, and normalisation pipelines for structured and semi-structured data.
   • Fed the outputs into search engines, recommendation systems, and analytical visualisation tools.

   Company website
3. NTT DATASoftware Engineer · Santander, SpainSep 2024 – Jul 2025

   • Built and evolved banking microservices across Python (Django) and Java (Spring) stacks.
   • Designed a token-vault microservice from scratch on Redis, serving thousands of daily requests across backoffice workflows.
   • Used Kafka as the backbone for event-driven architecture and as a structured log pipeline, decoupling producers from consumers.
   • Modelled new tables in existing Oracle and DB2 schemas to support new use cases.
   • Shipped on OpenShift with GitHub Actions CI/CD; quality gates via SonarQube and Fortify in a regulated environment.

   Company website
4. LIS Data SolutionsSoftware Engineer · Santander, SpainSep 2023 – Sep 2024

   • Worked across clients including the Regional Government of Castilla y León, a real estate developer, and an international logistics company.
   • Moved to R&D and contributed to the early architecture of an in-house LLM product built with LangChain.
   • Designed two proof-of-concept demos that shaped product direction: driver profitability analytics, and a SharePoint knowledge base with event-driven index consistency via content hashing.
   • Built ETL pipelines (Pandas, Selenium, Scrapy) feeding analytical and AI workloads.
   • Owned the full deployment cycle on Azure App Service with GitLab CI/CD.

   Company website
5. ZarttechIntern Backend Developer · The Hague, NetherlandsMar 2023 – Sep 2023

   • Sole backend developer, owning the full backend lifecycle end-to-end as a first professional experience.
   • Built authentication, business services, REST endpoints, the PostgreSQL data model, and the test suite from scratch in Java and Spring Boot.
   • Set up the deployment pipeline on AWS Elastic Beanstalk with GitHub Actions, leaving the backend near production-ready.

   Company website