Lautaro Acosta

https://x.com/lautidev_
https://github.com/LautaroAcosta
https://www.linkedin.com/in/acostalau/

Summary

I am a software engineer with +5 YOE in building startups. I specialize in payments and fintech.

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Library

Books I’ve read

Experience

Rebill

Founder Engineer
  • Built Rebill’s payments infrastructure from the ground up, now powering transactions across Latin America.
  • Lead backend systems architecture, including integrations with multiple payment providers and treasury operations.
  • Promoted from Software Engineer to Founder Engineer within the first year, taking ownership of the company’s core technical direction.

Finbase

Co-Founder
  • Co-founded a B2B fintech SaaS building a financial reconciliation engine for companies handling high-volume transactions.
  • Designed and built the entire technical architecture (NestJS, Next.js, Supabase, GCP, tRPC) end-to-end, from infrastructure to UI.
  • Built a multi-source reconciliation engine detecting inconsistencies across payment providers, banks, crypto custodians, and ERPs — processing 2M+ transactions/month at 98% accuracy.
  • Integrated with Fireblocks and internal accounting systems; built interactive dashboards for error tracking and key metrics.
  • Reached $1,000 USD MRR validating the product with real fintech clients before winding the company down in 2025.

Takenos

Backend Engineer
  • Led backend development for Takenos’ B2B product, owning balances, transactions, and payment scheduling systems.
  • Built an ACH withdrawal system enabling USD transfers to the United States via international wire transfers.
  • Developed the transaction/invoice management system and an in-app user event tracking system.
  • Served as technical lead for the B2B business line, building and maintaining core API endpoints.

Coderhouse

Professor
  • Teach full-stack web development to 150+ students per cohort at one of LatAm’s largest tech bootcamps.
  • Manage and coordinate the team of teaching assistants supporting each cohort.
  • Mentor students through debugging and problem-solving, translating errors into clear, actionable explanations.

Inisoft Global

Full Stack Engineer
  • Built a money-transfer (“swap”) system enabling users to move funds between accounts.
  • Developed a full CRUD news module and its API endpoints from scratch.
  • Migrated legacy services from Node 14 to Node 18 and improved API performance across the stack.
  • Implemented new APIs across Express, NestJS, and Koa; owned backend code review for the team.

Travia.es

Full Stack Engineer
  • Implemented a payment gateway integration and built the endpoints powering a new payment reprocessing flow.
  • Improved the user registration/onboarding flow and integrated multiple third-party services.
  • Wrote onboarding documentation to help new engineers ramp up on the codebase and workflows.

Coderhouse

Teaching Assistant
  • Supported students as a teaching assistant in web development courses, the entry-level role that led to the Professor position.