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Senior Software Engineer
& Tech Lead

7+ years designing and leading production systems at e-commerce scale — payments, fraud detection, and distributed backends processing millions of transactions. Tech Lead at Ripley Chile.

Founder of Feel Coding. Former CTO. I set technical direction, build engineering teams, and ship reliable products — at startup speed.

01 — Background

< About Me />

I'm a Senior Software Engineer and Tech Lead with 7+ years of experience building high-traffic payment, promotion, and risk systems for e-commerce.

My background includes a strong focus on Node.js/NestJS, microservices, event-driven architectures, and cloud platforms (GCP/AWS). I previously served as CTO at Miss Berni, where I launched a Resume Builder SaaS that generated over 100,000 CVs in just 6 months.

Currently, I lead teams building scalable services with resilient architectures and zero-downtime deployments. I'm passionate about observability, reliability, and mentoring developers to build world-class software.

02 — Work

< Featured Projects />

Payments Hub

Microservices platform for payments with integrations to multiple processors, agnostic vaults and tokenization.

Nest.jsExpressGolangGKEMongoDBBigQueryELKDatadog

Eval Risk

Event-driven risk evaluation system integrating fraud tools, Cybersource, and in-house blacklists.

Nest.jsMicroservicesEvent-drivenBigQueryCybersource

Resume Builder (SaaS)

SaaS for CV generation and class planning, using OpenAI to assist Chilean teachers.

Next.jsNest.jsMongoDBGraphQLOpenAIAzureGCPDatadog

AniReveal

Anime discovery and recommendation platform with interactive guessing games.

Next.jsReactTypeScriptTailwind CSS

Findly Now

Real-time search and discovery service built with Elixir for exploring remote opportunities.

ElixirPhoenixPostgreSQL

Numonic

SaaS platform for email deliverability monitoring and optimization powered by AWS SES.

Next.jsNestJSAWS SESAWS LambdaTypeScriptPostgreSQLEventBridge

STNDY

LATAM micro-store SaaS empowering creators and entrepreneurs to sell products online with minimal setup.

Next.jsNestJSMongoDBTypeScriptStripeMercadoPagoGCP

Tessera

LLM-powered fraud analyst agent that investigates ambiguous transactions with grounded verdicts, live tool calls, and a human-in-the-loop RAG flywheel.

PythonFastAPIGoNext.jsAnthropic ClaudePostgreSQLpgvectorLangfuseDockerGCP

04 — Connect

< Get In Touch />

I'm always open to discussing new projects, creative ideas, or opportunities to be part of your vision. Feel free to reach out!

© 2025 Juan Sarabia. All rights reserved. Built with Next.js & TailwindCSS