Marcos Alvarez
Marcos Alvarez

Senior Full-Stack Engineer

Open to offers · Member since 14 Sep 2026
Message
Location
Cúcuta, Colombia
Desired salary
Confidential
Work preference
Remote Only / Full Time, Part Time, Contract, Freelance
Experience level
Senior

About

Professional summary

I am a senior full-stack engineer with 13 years of experience delivering production software using TypeScript, Node.js, React, AWS, and cloud-native infrastructure. I build and own critical systems end to end, from customer-facing interfaces and APIs to data pipelines, observability, and incident response.

For the last four years, I have helped scale a mortgage-lending platform through a B2C-to-B2B pivot and the evolution from a small set of services into a 16-service event-driven monorepo. I have delivered high-volume communications, secure document-upload, loan-processing, and search/filtering systems for sensitive financial workflows.

I specialize in production LLM engineering, combining AI capabilities with deterministic safeguards, evaluation harnesses, provider failover, cost tracing, and human-review paths. I have built LLM-assisted classification and extraction workflows, RAG-backed agents, MCP servers, and AI-agent tooling while prioritizing reliability and measurable quality.

My backend background includes multi-tenant SaaS platforms, REST APIs, webhooks, microservices, ETL and legacy-SAP migrations, PostgreSQL, MongoDB, Redis, and event-driven architecture. I am experienced in zero-loss data migrations, secure PII handling, field-level encryption, retryable processing pipelines, and operational resilience.

I also enjoy technical leadership and client-facing delivery. I have led teams, mentored and onboarded engineers, restored client confidence on troubled projects, authored on-call workflows, and driven architecture and delivery decisions across distributed engineering teams.

I am based in Cúcuta, Colombia, work remotely in UTC-5, and overlap with US working hours. I am interested in senior full-stack, backend, platform, and AI/LLM engineering opportunities where I can build reliable systems with meaningful business impact.

Notice period: 2 Weeks

Skills

32 capabilities

Tech stack & tools

Working toolkit

Experience

Career history

Senior Full Stack Engineer House Numbers

I built and maintain a communications service that triaged more than 57,000 emails, SMS messages, and calls over seven months, with approximately 70% reaching automated outcomes. I implemented webhook intake, LLM-assisted extraction and classification, deterministic routing, loan matching over field-level-encrypted data, alerts, durable retries, and webhook reconciliation.

I designed a hardened public document-upload boundary using opaque sessions, CAPTCHA, rate limiting, replay protection, and encrypted audit trails. I also built React filter interfaces and a reusable TypeScript query library for tenant-scoped loan data, led incident response for document-processing failures, and reprocessed affected data without permanent loss.

I replaced hallucination-prone LLM document checks with deterministic validation and decomposed a monolithic pipeline into idempotent, retryable stages. I led migration away from Orq.ai to repository-native LLM infrastructure across four services, including versioned prompts, provider failover, per-call cost tracing, and automated evaluations.

I authored the shared on-call investigation workflow and designed CI-gated, agent-consumable monorepo documentation. My work also includes alert-to-PR automation concepts in which agents gather evidence and draft fixes for engineer review.

Senior Software Development Engineer Xogito Group

I became the main backend engineer for a multi-tenant SaaS platform for real-time quality-control inspections. I owned backend architecture and delivery end to end using NestJS, TypeScript, PostgreSQL, AWS, and GitLab CI.

After a project manager resigned, I helped recover a dissatisfied client account by acting as the team's spokesperson, delivering quick wins, repairing core workflows, and leading product discussions for roughly six months. The client regained confidence and commissioned additional work.

I led a legacy-SAP data migration by evaluating ETL tools, creating custom scripts where needed, and validating financial rounding compatibility with platform users early. The migration required no post-migration reconciliation.

I also onboarded and mentored engineers, contributing to an approach that was later adopted as a rotating buddy program. Across Xogito Group and House Numbers, I helped onboard more than 15 people.

Senior Software Engineer FullStack Labs

I worked as a full-stack engineer on a procurement platform rebuilt for a US fiduciary purchasing agent. My work involved Node.js, React, PostgreSQL, AWS, and Docker.

I owned the migration of historical quote data from a legacy SAP system with zero data loss. I created custom ETL processes, investigated and resolved a financial-total discrepancy caused by SAP and JavaScript rounding differences, and executed a frozen cutover supported by snapshot-backed reconciliation.

Following the MVP launch, users retired the legacy system. I contributed across backend services, frontend product functionality, database workflows, and cloud deployment concerns.

Senior NodeJS Software Developer Belatrix Software

I served as acting technical lead for a dynamic-document platform. I designed and delivered a serverless architecture using AWS Lambda, CloudFormation, and DynamoDB.

I led a four-person engineering team through delivery, coordinating technical decisions and implementation work. The role combined Node.js development, cloud architecture, and team leadership.

Senior Full Stack Developer and DevOps Rokk3r

I worked through Kubesoft SAS as a senior full-stack developer and DevOps engineer. I helped migrate a real-time telecom monolith into an AWS Kubernetes microservices cluster.

I also migrated a mobile backend away from Parse before its shutdown deadline. My work covered application development, infrastructure, deployment, and modernization of production systems.

Senior Full Stack & Mobile Developer Kubesoft SAS

I developed web and hybrid-mobile products for Colombian and international clients. I worked across full-stack application development, mobile-oriented product delivery, backend services, and client-facing implementation.

I built the first backend for Mutual, a hackathon-winning parenting application. From February 2016 onward, I was assigned full time to the Rokk3r engagement while remaining associated with Kubesoft SAS.

Full Stack Developer and DevOps Jarvi Games

I developed a real-time game backend that supported micropayments. My stack included Node.js, MongoDB, PostgreSQL, PHP, and production infrastructure responsibilities.

I contributed across backend development, data storage, real-time application needs, and DevOps operations. This role established my foundation in full-stack engineering and production systems.

Education

Learning history

Universidad Nacional Abierta y a Distancia (UNAD)

B.S. coursework, Systems Engineering

Coursework toward a Bachelor of Science in Systems Engineering.

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