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manuel sierraMS
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manuel sierra

@manuelsierra

Backend Engineer at Quantyc building a multi-tenant SaaS platform with live AFIP invoicing and Mercado Pago payments.

Argentina
Message

At Quantyc, I architected a multi-tenant SaaS platform for Argentine businesses, connecting six or more services with event-driven communication. I integrated Mercado Pago payments with idempotent webhook processing and implemented AFIP electronic invoicing with real CAE issuance for a live production client.

I built Joy-Store from scratch as an earlier e-commerce and delivery platform, which became the proving ground for Quantyc's architecture. I own deployments and production support end to end.

At Finalis, I migrated more than 50,000 records between legacy and new systems, using bidirectional sync and reconciliation to maintain data integrity. I also built an entity-transfer feature that reduced processing time from 45 minutes to 5 across more than 1,000 monthly transfers.

As a freelance developer, I deployed a production platform for Rumipal Bebidas and built an ordering platform for Bon Appetit Pastas. The latter doubled weekly sales and reduced order placement time to two minutes.

Experience

Work history, roles, and key accomplishments

SE
Current

Freelance Full-Stack Developer

Self Employed

Jan 2022 - Present (4 years 9 months)

Deployed production web platforms for clients, including a MERN-stack ordering platform that doubled weekly sales and reduced order placement time.

FI

Back-End Developer

Finalis

Aug 2022 - May 2025 (2 years 9 months)

Migrated 50,000+ records with 100% data integrity and built an entity-transfer feature reducing processing time by 89%. Developed a support ticket system improving response time by 83%.

Education

Degrees, certifications, and relevant coursework

Udemy logoUD

Udemy

Microservices with NestJS, Microservices

Completed a course on microservices with NestJS.

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Udemy

Microservices Architecture, Microservices

Completed a course on microservices architecture.

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Udemy

React.js Advanced, React.js

Completed an advanced course on React.js.

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Udemy

Full-Stack Web Development Bootcamp, Web Development

Completed a full-stack web development bootcamp.

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Udemy

Node.js Complete, Node.js

Completed a comprehensive course on Node.js.

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