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Senior Full-Stack Engineer with 10+ years of experience building scalable, high-impact systems for startups and enterprise companies. Expert in the modern web stack: React/TypeScript, Node.js, PostgreSQL, and Elasticsearch, with proven success architecting microservices that handle millions of daily interactions. I specialize in end-to-end feature ownership—from system design and API development to front-end implementation and production deployment. My track record includes reducing search latency by 70% through Elasticsearch optimization at HumanAPI, building cloud deployment frameworks that cut production time by 80% at Telus, and creating developer collaboration platforms integrating real-time data from external APIs at [CTO.ai](_Website not available. Sign in: https://www.twine.net/signup_ Currently seeking opportunities in AI/ML-driven products where I can leverage my experience integrating LLM systems and building data-intensive applications. I thrive in fast-paced environments where technical excellence, ownership, and measurable impact matter. Core expertise: React, TypeScript, Node.js, PostgreSQL, Elasticsearch, GraphQL, AWS, microservices architecture, modular applications, CI/CD, AI/ML integration.…Senior Full-Stack Engineer with 10+ years of experience building scalable, high-impact systems for startups and enterprise companies. Expert in the modern web stack: React/TypeScript, Node.js, PostgreSQL, and Elasticsearch, with proven success architecting microservices that handle millions of daily interactions. I specialize in end-to-end feature ownership—from system design and API development to front-end implementation and production deployment. My track record includes reducing search latency by 70% through Elasticsearch optimization at HumanAPI, building cloud deployment frameworks that cut production time by 80% at Telus, and creating developer collaboration platforms integrating real-time data from external APIs at [CTO.ai](_Website not available. Sign in: https://www.twine.net/signup_ Currently seeking opportunities in AI/ML-driven products where I can leverage my experience integrating LLM systems and building data-intensive applications. I thrive in fast-paced environments where technical excellence, ownership, and measurable impact matter. Core expertise: React, TypeScript, Node.js, PostgreSQL, Elasticsearch, GraphQL, AWS, microservices architecture, modular applications, CI/CD, AI/ML integration.

Mauricio Mercado

Full Stack Developer, Back-End Developer, Front-End Developer, +2

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Senior Full-Stack Engineer with 10+ years of experience building scalable, high-impact systems for startups and enterprise companies. Expert in the modern web stack: React/TypeScript, Node.js, PostgreSQL, and Elasticsearch, with proven success architecting microservices that handle millions of daily interactions. I specialize in end-to-end feature ownership—from system design and API development to front-end implementation and production deployment. My track record includes reducing search latency by 70% through Elasticsearch optimization at HumanAPI, building cloud deployment frameworks that cut production time by 80% at Telus, and creating developer collaboration platforms integrating real-time data from external APIs at [CTO.ai](_Website not available. Sign in: https://www.twine.net/signup_ Currently seeking opportunities in AI/ML-driven products where I can leverage my experience integrating LLM systems and building data-intensive applications. I thrive in fast-paced environments where technical excellence, ownership, and measurable impact matter. Core expertise: React, TypeScript, Node.js, PostgreSQL, Elasticsearch, GraphQL, AWS, microservices architecture, modular applications, CI/CD, AI/ML integration.…Senior Full-Stack Engineer with 10+ years of experience building scalable, high-impact systems for startups and enterprise companies. Expert in the modern web stack: React/TypeScript, Node.js, PostgreSQL, and Elasticsearch, with proven success architecting microservices that handle millions of daily interactions. I specialize in end-to-end feature ownership—from system design and API development to front-end implementation and production deployment. My track record includes reducing search latency by 70% through Elasticsearch optimization at HumanAPI, building cloud deployment frameworks that cut production time by 80% at Telus, and creating developer collaboration platforms integrating real-time data from external APIs at [CTO.ai](_Website not available. Sign in: https://www.twine.net/signup_ Currently seeking opportunities in AI/ML-driven products where I can leverage my experience integrating LLM systems and building data-intensive applications. I thrive in fast-paced environments where technical excellence, ownership, and measurable impact matter. Core expertise: React, TypeScript, Node.js, PostgreSQL, Elasticsearch, GraphQL, AWS, microservices architecture, modular applications, CI/CD, AI/ML integration.

Available to hire

Senior Full-Stack Engineer with 10+ years of experience building scalable, high-impact systems for startups and enterprise companies. Expert in the modern web stack: React/TypeScript, Node.js, PostgreSQL, and Elasticsearch, with proven success architecting microservices that handle millions of daily interactions.

I specialize in end-to-end feature ownership—from system design and API development to front-end implementation and production deployment. My track record includes reducing search latency by 70% through Elasticsearch optimization at HumanAPI, building cloud deployment frameworks that cut production time by 80% at Telus, and creating developer collaboration platforms integrating real-time data from external APIs at [CTO.ai](Website not available. Sign in: https://www.twine.net/signup

Currently seeking opportunities in AI/ML-driven products where I can leverage my experience integrating LLM systems and building data-intensive applications. I thrive in fast-paced environments where technical excellence, ownership, and measurable impact matter.

Core expertise: React, TypeScript, Node.js, PostgreSQL, Elasticsearch, GraphQL, AWS, microservices architecture, modular applications, CI/CD, AI/ML integration.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Language

Spanish; Castilian

Fluent

English

Fluent

Work Experience

Senior Software Engineer at Coursedog

March 1, 2023 - November 3, 2025

Designed and maintained real-time, bi-directional integrations with educational systems including Oracle PeopleSoft, Ellucian Banner/Ethos, Jenzabar. Enabled institutions to streamline class, event, curriculum, and catalog planning through seamless integration of disparate systems. Contributed to risk minimization by building stable integrations resilient to updates in PeopleSoft.

Architect, Designer And Lead Developer at Codigo

January 1, 2008 - November 3, 2025

Founded and led Codigo, delivering custom, efficient, and scalable software solutions. Managed full-stack development using Python, Node.js, AWS, React.js, and more. Worked closely with clients to meet specific needs, collaborating with designers and specialists as needed.

Senior Software Engineer at Sharecare (Previously Doc.Ai)

March 1, 2023 - March 1, 2023

Created and maintained SmartOmix, a decentralized research platform for researchers, built with ReactJS. Created and maintained npm modules for components and API client communication. Created and maintained npm packages for consistent development experience across SmartOmix and its dependencies.

Senior Engineer at Diligent (Previously Galvanize)

March 1, 2022 - March 1, 2022

Led a team in adopting Fastify (NodeJS) and AWS Lambdas. Mentoring developers to adopt JavaScript best practices and embracing functional programming. Used strangler patterns to modernize the existing monolithic codebase.

Consultant Senior Engineer at Mobilelive

October 1, 2021 - October 1, 2021

Created an abstraction layer with JavaScript to create micro frontend experiences and micro container based applications. Led a client to the adoption of micro frontends using the abstraction layer built.

Senior Lead Engineer at Cto.Ai

April 1, 2021 - April 1, 2021

Guided developers to adopt an open source collaboration model. Built a GitHub application with NodeJS and Fastify to integrate developer data from GitHub organizations for analysis in CTO’s dashboard. Implemented automated quality control across projects to standardize practices using GitHub Actions. Migrated monolithic features to extensible micro-services using the serverless framework with AWS.

Senior Software Engineer at Telus

July 1, 2020 - July 1, 2020

Provided best practices and guidance to the community of developers at Telus. Led a team through planning, design and execution of a new NodeJS based framework, leveraging Fastify’s plugin-based architecture, that would facilitate secret injection through Vault, tracing using Zipkin, logging and reusability, CI/CD with GKE and CloudBuild, while maintaining the current system. Infrastructure automation was managed using Terraform and GCP APIs. Kubernetes with GKE for automated deployment. Used GitHub API to automatically create remote repositories with GitHub actions and standard labels for issues and documentation.

Senior Lead Engineer at Navarik

March 1, 2019 - March 1, 2019

Provided training, code standards and best practices with NodeJS and React for the entire team of developers.

Senior Engineer at Humanapi

June 1, 2018 - June 1, 2018

Designed and deployed micro-service architecture-based services to retrieve, synchronize and visualize user data from various platforms, applications, devices and other health data providers. Integrated metrics instrumentation throughout the stack to report on performance, availability and user interaction; used ElasticSearch for search; RabbitMQ for service bus; Jenkins and Docker for CI/CD.

Senior Engineer at Selfie Inc.

July 1, 2015 - July 1, 2015

Led a team of engineers through design, planning, execution and deployment of the different micro-services that comprised the application. Used ZeroMQ and REST for passing messages between micro services. Used MongoDB for data storage and Redis for caching user timelines. Created a Twilio API integration to provide 2 factor authentication for users of the platform.