Full Stack Developer

Jaume Balust

Full Stack Developer since 2015. Industrial Engineer turned developer. 100% committed to increasing efficiency in everything I touch.

📍 San Luis Potosí, Mexico · Originally from Barcelona

Fluent in Spanish, English, Catalan, and French.

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About Me

🎓 Background

Studied Industrial Engineering (Electrical) at UPC Barcelona. Worked 2 years as an Electrical Engineer before switching to development.

💻 Development

Since 2015 building fullstack apps, leading teams, and designing systems from scratch. Multiple CTO positions owning DB architecture to frontend delivery.

🚀 Currently

Currently at Algebrakit, building math widgets serving 100K+ students daily across the Netherlands, Belgium, Singapore, and more. Working with TypeScript, React, Docker, Kubernetes, Redis, GraphQL, and WebSockets.

🌍 Languages

Fluent in Spanish (native), English (fluent), Catalan (native), and French (fluent). Lived in 5 countries across 3 continents. Based in San Luis Potosí, Mexico.

Exceptional Work

Systems I've built from scratch that create real-world impact at scale.

🧮

Algebrakit — Scaling Math Education

Building math widgets that serve the learning needs of students across the Netherlands, Belgium, Singapore, and more. Powering interactive math experiences for 100K+ students every day.

100K+ students/dayMultiple countriesTypeScript + React

🏥

Estimtrack — Transforming Hospital Operations

Redesigned the entire system from 19 apps per hospital down to 6. Optimizing patient flow and OR coordination across 4 major hospitals in Catalonia.

350K+ staff tasks100 patients/day19 → 6 apps

⚖️

Fiscalito — AI-Powered Legal Search

Built a RAG-powered legal search platform for Mexican lawyers. An AI agent searches indexed court rulings and uses LLM to compare and determine relevance to active cases.

RAG + LLMAI AgentsReal-world impact

🚚

Kiwi Last Mile — Logistics at Scale

Built from scratch an orchestration app handling 40+ drivers and 500+ deliveries daily for a last-mile delivery provider in Barcelona.

500+ deliveries/day40+ driversBuilt before coding agents

Experience

Nov 2023 – Present

Full Stack Developer

Algebrakit

TypeScript, React, Docker, Kubernetes, Redis, GraphQL, WebSockets

Building math widgets serving 100K+ students daily across the Netherlands, Belgium, Singapore, and more
Scaling educational technology for international markets

May 2019 – Present

CTO → Consultant

Estimtrack

Technical lead: DB, Backend, Frontend

Acquired by Diractive May 2024, currently consulting
Redesigned system from 19 apps per hospital down to 6
Spin-off of Hospital Clínic, optimizes patient flow / OR coordination
Impact: 100 patients/day, 300+ happier relatives/day, 350K+ staff tasks since 2016
Hospitals: Clínic de Barcelona, Sant Pau, Igualada, Mollet

Feb 2020 – Aug 2022

CTO

Meetaitech

Designed entire system from scratch. DB, Serverless, Backend, Frontend.
Meeting optimization startup.

Apr 2018 – May 2019

CTO

Kiwi Last Mile

Built app from scratch: 40+ drivers, 500+ deliveries daily. Barcelona.

Mar 2017 – Apr 2018

PHP Developer

Inbenta

Knowledge team, FAQ sites, patented search algorithm.

Nov 2015 – Mar 2017

PHP Developer

Estimtrack

Jul 2013 – Nov 2015

Electrical Engineer

Fallprotec, Luxembourg

Ropeclimber electrical systems + PM first batch of 20 units.
Battery hoist, 240kg, people-certified.

Side Projects

⚖️

Fiscalito.com.mx

Mexican legal search platform. Indexed sentencias (court rulings) with RAG so lawyers can search them. AI agent searches via RAG and compares sentencias using LLM to determine relevance to a case.

RAGLLMAI AgentsPython

Visit site →

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