Senior Backend Developer · Cloud Automation Engineer
Luis Eduardo Marin Aguilera
I engineer backend systems that stay in production for years — cloud automation, AI integration that survives contact with real workloads, and legacy stacks brought into the modern world.
Taking on select B2B contracts & technical partnerships
Lima, Peru (GMT-5) · Full overlap with US business hours
years shipping production systems, since 2007
one automation bot ran uninterrupted (2015–2025)
e-commerce brands on the B2B platform I build & operate
versioned releases to production for my current US client
About
I don't just write code; I engineer business stability.
My specialty is bridging the gap between legacy operations and modern cloud architectures. I build systems designed to run autonomously for years — like a custom automation bot I deployed in 2015 that ran uninterrupted for a decade, until the external platform it automated changed in 2025. Today I bring that same reliability to production AI integrations (Gemini, Vertex AI) and to a multi-client B2B platform I build and operate for a US e-commerce group, shipping to production weekly.
Selected Work
Ongoing platform work for a US group operating several e-commerce brands. I own the full stack: architecture, backend, frontend, integrations, build tooling and releases.
- B2B order management — a single-page web app on Google Apps Script for wholesale order operations against Shopify: draft/complete/tracking flows, per-client document storage, and role-based permissions
- AI email classification — a Gemini-powered system that classifies and labels customer messages in production across multiple brands, using batched calls and structured JSON responses
- Engineering discipline — custom Bun build pipeline with tree-shaken bundles, local unit tests with mocked GAS services, and E2E testing through Chrome DevTools Protocol
Built Google Workspace Add-ons (Docs + Drive) with Vertex AI integration for a regulated-industry enterprise. Designed a batch migration pipeline for 50,000+ users using Cloud Functions, Pub/Sub, and Cloud Storage.
Extended microservices in Node.js and Go for fintech backoffice. Built AWS Lambda + Step Functions serverless orchestrations. Wrote Python scripts to diagnose and fix production transaction inconsistencies in DynamoDB.
Automation bot to register 2,000+ imported products in a government portal every quarter. Replaced a fully manual process that consumed 2 full weeks of the manager's time.
Problems I Solve
- You need Senior-level architecture decisions without the friction of hiring a full-time executive
- Your high-value employees are wasting 40+ hours/month on manual data entry that a script could do in seconds
- You have valuable data trapped in legacy systems (Excel, SQL) that needs to talk to modern AI & Cloud tools
- You want to integrate AI (Vertex AI/OpenAI) into your workflows but need a robust, production-grade implementation, not just a toy demo
- You need custom Shopify integrations that no plugin can handle
Best fit: startups modernizing a legacy stack, digital agencies that need senior backend on retainer, and companies adopting AI who need it running in production — not a demo. Defined scope, B2B contract. Not a fit for equity-only work, unpaid trials, or projects without a defined scope.
What I Deliver
- Cloud & Serverless ArchitectureAWS Lambda, Step Functions · Google Cloud Functions, Pub/Sub
- AI & Process AutomationGemini & Vertex AI production integrations, email classification, document processing
- Legacy ModernizationVB/Excel macros migrated to modern Web & Cloud stacks
- Google WorkspaceAdvanced Add-ons, Apps Script WebApps (SPA), Drive/Docs/Gmail automation
- E-commerce IntegrationsShopify GraphQL, ShipHero, Recharge
Companies I've Worked With
Career Path
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2023 — Present
LEMAGUILERA TECH SOLUTIONS — Independent Consultancy Remote B2B contracts with US clients: Focus Solutions LLC (active), Onix (Google Cloud Partner), VLAS TECH (Romania)
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2021 — 2023
Kushki — Fintech, LATAM Backend Developer: Node.js and Go microservices, AWS serverless (Lambda, Step Functions, DynamoDB)
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2017 — 2020
Velogig & RMG — Lima, Peru Full Stack: data pipelines, ML pricing dashboard for Ripley, advertising tools for Grupo El Comercio
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2007 — 2017
Venezuela — Business Systems & Automation Payroll, inventory and invoicing systems, browser automation bots (VB.NET, PHP/MySQL)
Tech Stack
What Clients Say
"Luis demonstrated exceptional technical proficiency across multiple projects. His in-depth knowledge of Google Apps Script and Cloud Functions was instrumental in delivering Google Workspace add-ons and Vertex AI integration demos."
"The collaboration demonstrated exceptional technical proficiency and project management capabilities. The delivered Google Workspace widget met all specified requirements and significantly improved our operational workflow efficiency."
"A custom web interface was developed that integrated with our price prediction model, facilitating scenario visualization and accelerating decision-making. The tool was clear, functional and quickly adapted to our internal needs."
"We received a sales and inventory solution fully adapted to our operations, which we used for several years. The automation bot for product registration worked reliably for 10 years. The work was always punctual, effective and focused on solving real business problems."
Let's Work Together
$35–50/hr · scoped per project or ongoing contract
Tell me about the system you need to build, automate, or rescue. A 30-minute discovery call is enough to know if I'm the right fit — and if I'm not, I'll tell you.