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Marcos Javier Alvarez Maestre

@garusis

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Senior Full-Stack Engineer · TypeScript, Node.js, React, AWS · Production LLM systems

Colombia

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What I'm looking for

Senior IC full-stack, frontend or backend roles, full-time and fully remote.

Senior full-stack engineer with 13 years shipping TypeScript/Node.js, React and AWS products, the last four at House Numbers, where I joined an engineering team of three (now seven) and helped take a mortgage-lending platform through a B2C-to-B2B pivot and from a handful of services to a 16-service event-driven monorepo. I own critical production systems end to end, including a communications service handling 57,000+ emails, SMS and calls in a recent seven-month window (~70% automated) and a hardened public document-upload boundary, and for the last three years have put LLM features into production with evaluation harnesses, cost tracing and deterministic safeguards. Earlier: main backend engineer on a multi-tenant SaaS, two legacy-SAP data migrations, a monolith-to-Kubernetes migration, client-facing delivery.

Experience

Work history, roles, and key accomplishments

Current

Senior Full Stack Engineer

Current

House Numbers

May 2022 - Present (4 years 5 months)

Built and maintain the communications service that triaged 57,000+ emails, SMS and calls in a recent seven-month window, ~70% to an automated outcome, letting operations retire its manual-triage shifts. Eliminated failed-upload complaints on a public document-upload flow: designed and built the replacement security boundary. Owned incident response on the document-processing path.

TypeScript Large Language Models React Microservices NodeJS MongoDB AWS ECS Redis Kubernetes OpenAI API Anthropic API New Relic Zod

Senior Software Development Engineer

Xogito Group

Dec 2020 - Mar 2022 (1 year 3 months)

First engineer assigned to, then main backend engineer of, a multi-tenant SaaS for real-time quality-control inspections (NestJS, TypeScript, PostgreSQL, AWS, GitLab CI); owned backend architecture and delivery end to end. Led the platform's legacy-SAP data migration: evaluated ETL tooling, built custom scripts, and needed no post-migration reconciliation.

NestJS TypeScript PostgreSQL Docker Gitlab CI AWS

Senior Software Engineer

FullStack Labs

Dec 2018 - Dec 2020 (2 years)

Full-stack engineer (Node.js, React, PostgreSQL) on a procurement platform rebuilt for a US fiduciary purchasing agent (FF&E/OS&E). Owned the migration of historical quote data out of a legacy SAP system with zero data loss: custom ETL, traced a financial-total discrepancy to SAP/JavaScript rounding differences, and ran a frozen cutover with snapshot-backed reconciliation.

NodeJS React PostgreSQL AWS Docker

Senior NodeJS Software Developer

Belatrix Software

Jul 2018 - Nov 2018 (4 months)

Acting technical lead: serverless architecture (Lambda, CloudFormation, DynamoDB) for a dynamic-document platform; led a four-person team delivering it.

Node.Js Development Serverless Architecture AWS Docker React DynamoDB AWS Lambda CloudFormation

Senior Full Stack Developer and DevOps

Rokk3r

Feb 2016 - Jun 2018 (2 years 4 months)

Via Kubesoft SAS: migrated a real-time telecom monolith to an AWS Kubernetes microservices cluster; migrated a mobile backend off Parse ahead of its shutdown deadline.

Node.Js Development AWS Kubernetes Docker

Senior Full Stack & Mobile Developer

Kubesoft SAS

Jan 2015 - Jun 2018 (3 years 5 months)

Web/hybrid-mobile products for Colombian and international clients; built the first backend of Mutual, a hackathon-winning parenting app. From Feb 2016 assigned full-time to Rokk3r (above).

Node.Js Development Docker IoT