First, an idea.
Then, the code.
Now, it's live

Full-stack developer specialised in AI and blockchain. One person, end to end: architecture, code and deploy. Based in Mallorca, working worldwide.

get in touchview work

selected work

// 01 · freelance · live in production

Intercompany stablecoin settlement platform

Distributed payment system automating intercompany settlements with Monerium EURe on Polygon. Two-service pipeline (ingestion + execution) decoupled via Kafka; idempotent write-first processing; state-driven transaction lifecycle; nonce-conflict resolution by partitioning topics per wallet; zero-message-loss recovery.

~15d → RT
settlement time cut to near real-time
400+/mo
transactions processed live
7
companies settled from one central entity
  • nestjs
  • kafka
  • postgresql
  • solidity · erc-20
  • polygon
  • k6

// 02 · totbits · open source

MCP server for on-chain DeFi analysis on Rootstock

Lets an LLM read Rootstock smart contracts in real time — no intermediate APIs, no indexed database. Three read-only tools over Money on Chain, RIF on Chain V2 and Sovryn: token prices, stablecoin peg health (collateral coverage, peg deviation, liquidation risk) and lending rates with liquidity and utilisation per market. Ask how DOC is doing and the answer is computed from the current block.

  • mcp · fastmcp
  • python
  • web3.py
  • rootstock
  • pydantic

// 03 · totbits · erp

Conversational AI agent inside an ERP

Natural-language layer over the ERP: intent classification decides which domain tools to call, and each one runs as a LlamaIndex workflow. Slots are validated and resolved before anything is written, and every risky action goes through an explicit confirmation step. Product lookup combines full-text, trigram and pgvector similarity on PostgreSQL, so the catalogue answers to how people actually name things. Each conversation records its own token usage and cost, which is what keeps the assistant affordable to run.

  • llamaindex
  • openai api
  • postgresql · pgvector
  • django
  • python

// 04 · totbits · document automation

Bulk invoice ingestion pipeline

Purchase invoices sent in bulk: each PDF enters through Kafka, an LLM turns it into a structured document and the result is posted to the ERP. Kafka absorbs the load spikes and keeps processing ordered and replayable, so a bad batch is reprocessed without losing or duplicating invoices.

  • openai api
  • langchain
  • kafka
  • fastapi

// 05 · totbits · human in the loop

Purchase invoices, from inbox to ERP

Invoices arrive by email — message and attachment taken from an SQS queue — and cross a staged workflow: extraction with a vision model, deterministic arithmetic and tax-ID validation. When confidence isn't enough the workflow stops and asks a person, by web form or by email, instead of guessing. Only then is the invoice posted to the ERP through a canonical, ERP-agnostic model. Multi-tenant.

  • openai api
  • fastapi
  • aws · ses · sqs
  • postgresql

// 06 · travel platform

Stablecoin payments for travel services

End-to-end payment lifecycle for hotels, transfers and accommodations — booking to on-chain settlement. Transaction orchestration, multi-provider state tracking, smart-contract settlement.

  • web3.js
  • mongodb
  • elasticsearch

experience

nov 2022 — present

Freelance

Full-stack developer

Distributed, event-driven architectures — from the design decision to production.

Event-driven backends and distributed systems. Analysis and design decisions for new features.

jul 2021 — nov 2022

Devo

Frontend developer

Activeboards, the product's new reactive dashboard platform, built with the product team.

Real-time data monitoring with React.js and RxJS, on an in-house product serving large accounts in retail and private banking.

apr 2017 — jul 2021

Babel SI

Full-stack → Team Leader

Went from building features to leading a team of 6.

Financial platforms and payment features for Bankia and Santander Consumer with Spring Boot and React.js. Mentoring the team's junior developers.

jul 2015 — apr 2017

SoftTelecom

Full-stack developer

~9 GB of data a day processed for Telefónica.

Data pipelines with Elasticsearch and Logstash on Spring Boot, plus Wan2Cloud, the provisioning app.

skills

languages

  • typescript
  • javascript
  • python
  • java
  • solidity

backend + data

  • nestjs
  • fastapi
  • django
  • spring boot
  • postgresql · pgvector
  • mongodb
  • elasticsearch
  • kafka
  • rabbitmq

blockchain

  • ethers.js
  • web3.js
  • web3.py
  • evm chains
  • erc-20
  • rootstock

ai + infra

  • openai api
  • langchain
  • llamaindex
  • mcp
  • aws
  • docker
  • github actions
  • k6
  • jest

achievements

// winner

Rootstock Hackathon

BitChill — DCA dApp built with React.js + Ethers.js.

// finalist

Actúa UPM

PassTicket — ticket management platform.

// finalist

IoT by Carriots

Smart Collar Pet — connected pet tracker.

contact

Got a payments or AI problem?

From smart contract design to API layer to frontend dashboards — I ship end-to-end.

paumb85@gmail.comlinkedingithub

mallorca, spain · +34 687 925 363 ·spanish (native) · english (b2)