Javier Arranz

Full-stack | Data | Cloud

Summary

Product engineer with end-to-end ownership across the full stack, including: infrastructure, backend, frontend, security, and CI/CD. Combines deep expertise in modern serverless architectures with a track record of shipping high-impact features from concept to production.

Experience

Flock

08/2023 - Present

Full Stack Engineer

Own complete product features from infrastructure design through delivery and monitoring. Build serverless, event-driven systems collaborating with Trading and Growth teams across the entire stack; infrastructure provisioning, database design, backend services, frontend interfaces, security implementation, and user feedback integration.

  • Design and implement serverless event-driven architectures on AWS using Lambda, EventBridge, and Queues
  • Build full-stack features end-to-end: IaC (Terraform and CDK), PostgreSQL, Node.js APIs, React
  • Implement security best practices, monitoring, and delivery pipelines with CI/CD and TDD approaches
TypeScript
Node.js
React
PostgreSQL
AWS
Lambda
DynamoDB
EventBridge
CI/CD
Serverless
Event-Driven Architecture
Functional Programming

Full Stack Engineering Specialist

Delivered full-stack solutions for insurance platform, owning features from architecture design through production deployment across backend services, frontend interfaces, and cloud infrastructure.

  • Built microservices and serverless functions using Node.js and TypeScript with PostgreSQL databases
  • Designed and implemented complete features end-to-end including AWS infrastructure, APIs, and React frontends
  • Collaborated across teams to deliver secure, scalable solutions from concept to production
TypeScript
Node.js
React
PostgreSQL
AWS
Microservices
Serverless

MTS Health Limited

02/2020 - 02/2022

Biomedical Engineer

Owned complete data solutions from ingestion to visualization, building ETL pipelines and analytics tools that consolidated multiple data sources to enable data-driven business decisions.

  • Designed and implemented end-to-end data pipelines using Python and SQL Server for medical device data
  • Built ETL processes to consolidate data from disparate sources into unified analytics schemas
  • Developed complex T-SQL queries and stored procedures to power business intelligence dashboards
Python
SQL Server
T-SQL
Data Engineering
ETL
Data Analytics

Projects

Vagus nerve activity recording and processing based on CNT yarn electrodes

09/2018 - 09/2019

Intrafascicular vagal activity recording and analysis based on carbon nanotube yarn electrode.

MATLAB
Python
Signal Processing
Object-Oriented Programming
Biomedical Engineering

Education

KTH Royal Institute of Technology

01/2017 - 01/2020

Master's degree Biomedical/Medical Engineering

Shanghai Jiao Tong University

01/2018 - 01/2020

Master's degree Bioengineering and Biomedical Engineering

Volunteer

Assistive Technology at KTH

11/2017 - 07/2018
Volunteer Biomedical Engineer

We worked in the development of a wearable device capable of helping Traumatic Brain Injury patients manage its energy and stress levels.