Manuel Andaluz

Manuel Andaluz

Backend Developer & Blockchain Engineer

Nationality: Spanish & Argentinian

Argentina

View CV

Experienced backend developer with a strong focus on building scalable and efficient solutions. Skilled in developing applications on the Solana blockchain and proficient in frontend technologies.

Tech Stack

#Solana
#Web3.js
#Anchor
#Rust
#TypeScript
#NestJS
#Node
#PostgreSQL
#MongoDB
#Next.js
#React

EXPERIENCE

Backend & Blockchain Engineer (Founding Team)

RebelFi

[object Object] logo

Jun 2024 - Jan 2026 | United States

PayPal PYUSD Hackathon WinnerProject name: Zerocut
  • Core engineer in the founding team responsible for designing and building the financial infrastructure powering multiple Web3 financial products: RebelFi POS, Zerocut, and Midas.
  • RebelFi POS: Contributed to the design and implementation of the backend and blockchain execution layer for a non-custodial crypto point-of-sale system that allows merchants to accept Solana-based payments with instant settlement and zero processing fees. Designed secure transaction flows, accounting logic, and vault interactions to ensure funds always remained under merchant control.
  • Zerocut: Designed and implemented the core on-chain accounting and treasury infrastructure for a crypto-native banking platform. Built double-entry bookkeeping models, vault architectures, and multi-step execution flows for transfers, payouts, and treasury operations, ensuring financial consistency and safety at scale. Won the Global PYUSD Portal Hackathon (PayPal) in the "Cha-ching!" DeFi/Trading category.
  • Midas: Designed a programmable financial infrastructure layer enabling institutions to access DeFi yield strategies without giving up custody or building smart contracts. Built yield orchestration systems, custody-safe execution models, and protocol integration layers abstracting Fireblocks, BitGo, and self-hosted custody setups.
  • Architected ring-fenced vault systems separating custody, execution, and accounting layers to eliminate the possibility of automation systems directly controlling funds.
  • Designed multi-phase financial state machines (Authorize → Initiate → Execute / Cancel) for withdrawals, transfers, and DeFi interactions to safely handle asynchronous blockchain execution.
  • Implemented role-based access control using Solana PDAs to enforce least-privilege security across admin, automation, and application keys.
  • Integrated multiple DeFi protocols using CPI calls with PDA signing, enabling automated yield generation while maintaining strict custody guarantees.
  • Built reconciliation tools and admin recovery flows to resolve on-chain state drift without breaking accounting invariants or financial integrity.

Tech Stack

#Rust
#Solana
#Anchor
#Smart Contracts
#CPI
#PDA
#NestJS
#TypeScript
#PostgreSQL
#MikroORM
#DeFi Protocols
#Helius / QuickNode RPC
#Docker
#MacOS
#Linux

Full Stack Developer

Stoical

Stoical logo

Apr 2024 - Present | Madrid, Spain

  • Developed dashboard for companies with tools to manage job offers, candidates, evaluate candidates' skills through AI-powered chat sessions using OpenAI API, interactive graphs, and more.
  • Designed a candidates' page where users can view their competencies in graph form, see assigned job offers, and access links to their test sessions.
  • Developed user authentication in Node.js using JWT for token creation and MongoDB for data storage.
  • Implemented a new theme with Material UI's extendTheme, incorporating responsive design elements like font sizes, colors, and typography.

Tech Stack

#Next.js
#Material UI
#TypeScript
#Zod
#React-hook-form
#ApexCharts
#Node.js
#OpenAI
#JWT
#MongoDB

Full Stack Developer

Silver Brain AI AG

Silver Brain AI AG logo

Oct 2023 - Mar 2024 | Zug, Switzerland

  • Led a front end team in two successful project implementations.
  • Developed the onboarding process for new users, enhancing user experience.
  • Implemented new features, including a payment form with auto-fill inputs using Google Places, and navigation components like navigation rail and navigation drawer.
  • Developed a vector search functionality for .pdf, .doc, and .pptx files.
  • Learned and integrated new technologies to me such as Django, Redis, and Jenkins.
  • Conducted performance testing on new and existing features to ensure optimal performance and identify bugs.

Tech Stack

#Next.js
#Django
#TypeScript
#Python
#PostgreSQL
#Redux
#Stripe
#React Hook Form
#React Query

Full Stack Developer Freelance

Enotar.io
Enotar.io logo

Sep 2023 - Oct 2023 | Costa Rica

  • Created and developed blog section, user dashboard and payment form.
  • Implemented user authentication on the front end and back end.
  • Created the modeling of the database.
  • Implemented user-friendly UI based on Material Design and custom metadata objects to make the site search results better in the Google search engine.
  • Deployed the Django app on AWS EC2 using Nginx and Gunicorn on Ubuntu platform.

Tech Stack

#Next.js
#Django
#TypeScript
#Python
#PostgreSQL
#Context
#Amazon AWS
#CSS Modules

PROJECTS

Healthy Market App

Healthy Market App

E-commerce built with Next.js and Node.js. The project includes features like: login, payment, admin dashboard, analytics, and so much more. You can see it all in the video down below the project image

#Next.js
#Typescript
#MongoDB
#SCSS
#Redux
#Mercado Pago
#JWT
#Payment
#Auth
#Admin Dashboard
#Analytics
GuardKey

GuardKey

GuarKey is a local based password manager for the moment, but I will be working on a cloud based as well

#Angular
#Ionic
#Android Studio
#Typescript
#Django
#Python
#SCSS
#Netlify
Enotar.io

Enotar.io

Enotar.io is a registration service that uses the latest technologies to protect copyright and intellectual property quickly and with absolute privacy. I made it working as a Freelancer, you can check here: https://www.enotar.io/en/about

#Next.js
#Typescript
#Django
#Python
#Auth
#CSS Modules
#Freelancer