Keyner W.Tupac Yupanqui Caballero
Full-Stack Engineer · AI Engineer
10+ years building scalable platforms end-to-end — from healthcare and CRM systems to AI-powered workflows — for U.S. and global clients.
About
Engineering leader focused on impact
Senior Software Engineer with over 10 years of experience building end-to-end, scalable platforms. Specialized in JavaScript/TypeScript, Node.js, NestJS, Laravel, React, and microservices architecture — with a strong focus on clean code, high-performance API design, and event-driven applications.
Led cross-functional teams implementing Scrum and best practices (Clean Code, SOLID), with hands-on experience applying generative AI through LangChain, MCP Servers/Clients, and LLMs (Ollama, Gemini, OpenAI) to automate workflows and enrich content. Experienced collaborating with U.S. stakeholders and globally distributed teams across healthcare, CRM, contact center, retail/ecommerce, and B2B data industries.
Core Strengths
- Full-Stack & Microservices Architecture
- AI Engineering (LangChain, MCP, LLMs)
- Technical Team Leadership
- Healthcare & CRM Domain Expertise
- Clean Code, SOLID & TDD Practices
- U.S. Client & Distributed Team Collaboration
Languages
English
C1 — Advanced
Spanish
C2 — Native
Expertise
Technical toolkit
Backend Engineering
Node.js · TypeScript · NestJS · Express · Laravel · Microservices · RESTful APIs · OAuth2 · JWT · TypeORM
Cloud & DevOps
AWS · Docker · CI/CD Pipelines · Linux · macOS · Git · Queues · Kafka · Redis
Architecture & Patterns
Microservices · Event-Driven · Clean Code · SOLID · Design Patterns · TDD · AAA Testing · WebSockets
AI & Intelligent Workflows
LangChain · MCP Servers & Clients · Ollama · Gemini · OpenAI · LLM Integration · AI-Powered Enrichment
Frontend Engineering
React · Next.js · Vue.js · Tailwind CSS · Chakra UI · Material UI · shadcn/ui · TanStack Query
Databases & Data
PostgreSQL · MySQL · Redis · Caching Strategies · Queue Systems · Real-time Data
AI-Powered Development
Cursor · Claude Code · GitHub Copilot · Amp · AI-assisted code generation, refactoring & debugging for accelerated software delivery
Experience
Career trajectory
Globant
Senior Software Engineer
Developing microservices and AI-powered tooling for Fusable, a US-based B2B data and insights company, building MCP Servers and intelligent workflow automation.
- Developed microservices across multiple business domains, improving response times by ~25% through cleaner service boundaries
- Built MCP Servers and Clients using Ollama and LLM models, reducing manual workflow time by ~30%
- Implemented React features including advanced search, REST API integrations, and Google Maps markers
- Tech: MCP Server & Client, NestJS, TypeScript, Microservices, Ollama, React, shadcn/ui, TanStack Query
Falabella Group
Senior Software Engineer
Built AI-powered product enrichment tools for Falabella Tecnología's ecommerce backoffice, supporting catalog analysis for 100k+ products.
- Built AI-powered product enrichment using LangChain and Gemini, reducing manual content preparation by ~35%
- Integrated product search and metrics endpoints across ecommerce backoffice applications for 100k+ products
- Accelerated product publication workflows by ~25% through better content suggestions and merchandising support
- Tech: React, TypeScript, Material-UI, Microservices, Vite
Aloware
Senior Software Engineer
Delivered features and production fixes for a Contact Center Platform as a Service, integrating AI-powered capabilities using LangChain.
- Delivered end-to-end user stories and production fixes, improving feature delivery speed by ~20%
- Integrated AI-powered features using LangChain, reducing manual agent steps by 15-20% in targeted workflows
- Tech: Node.js, Laravel, Microservices, Vue.js
Referwell
Team Lead → Senior Software Engineer
Led a distributed team of 6 engineers building healthcare appointment scheduling microservices, partnering directly with the CTO and stakeholders.
- Led a team of 6 engineers, driving technical alignment and delivery planning for the microservices roadmap
- Partnered with CTO and Engineering Manager to launch 3 core microservices, reducing monolith dependency
- Improved engineering delivery predictability by ~20% through stronger collaboration and development standards
- Developed Search Doctors module and BackOffice features, reducing internal processing time by ~25%
- Tech: Node.js, Laravel, React, Microservices, Kafka, Queues, WebSockets
Zeal Tech
Senior Software Engineer
Developed features for a healthcare appointment management platform used by doctors and patients in the U.S.
- Built new features improving user workflow efficiency by ~20% for U.S. healthcare professionals
- Integrated payments, SMS, and email services, reducing manual follow-up effort by ~25%
- Tech: Node.js, Laravel, React
LeadFort
Senior Software Engineer
Defined technologies and core features for a CRM platform, building scalable lead management workflows and integrating VoIP, Twilio, SMS, fax, e-signature, and payment services.
- Defined technologies, integrations, and core features for a CRM platform from the ground up
- Built lead search and sales workflows, improving lead handling efficiency by ~30%
- Designed RESTful APIs and integrated Twilio, VoIP, SMS, fax, e-signature, and payment services
- Tech: Node.js, Laravel, React, Git
BPO Andina
Software Engineer
Developed lead generation landing pages and designed email/SMS marketing campaigns.
- Built lead generation landing pages and marketing campaign systems
- Designed and executed email/SMS marketing campaigns
- Tech: CakePHP, jQuery, MySQL
Impact
What I build
AI-Powered Workflows
MCP Servers & Clients, LangChain integrations, and LLM-driven tools that automate product analysis, enrich content, and reduce manual effort by 30%+.
Healthcare Platforms
Appointment scheduling systems, doctor search modules, and patient workflow tools used by healthcare professionals across the United States.
CRM & Contact Center Systems
Full-featured CRM platforms with lead management, VoIP, Twilio integration, and AI-assisted contact center tooling for U.S. clients.
Ecommerce & Retail Tools
Product enrichment and merchandising systems for Falabella Group, supporting catalog analysis and publication workflows for 100k+ products.
Microservices at Scale
Distributed architectures with Kafka, queues, WebSockets, and event-driven patterns — breaking monoliths and improving system scalability.
Full-Stack Product Delivery
End-to-end engineering from database design to React frontends, delivering features from scratch to production for globally distributed teams.
Working Style
How I work
Product-Minded Engineering
I partner with CTOs, Engineering Managers, and stakeholders to ensure technical decisions drive real business outcomes — not just shipping code.
Team Leadership & Mentoring
Led distributed teams of 6+ engineers, driving technical alignment, delivery planning, and fostering continuous learning culture.
U.S. & Global Collaboration
10+ years working with U.S.-based companies across time zones — clear communication, async workflows, and reliable delivery.
Clean Code & Quality Culture
SOLID principles, TDD, code reviews, and design patterns aren't optional — they're how I build systems that last and teams that grow.
Contact
Let's connect
I'm open to new opportunities and interesting conversations. Whether you're hiring, have a project, or just want to talk engineering — reach out.