AI Automation & Integration
LLMs, RAG and AI agents wired into the backend you already run — automations inside your transactional systems and your data, built to production standards from day one.
- LLMs
- RAG
- AI Agents
- Spring AI
- LangChain4j
Available for new projects
Hi, I'mLisbey Urrea Marin
Senior Software Engineer & Technical Lead
Production-grade engineering for AI and the high-scale backends behind it.
Medellín, Colombia — available for remote freelance globally
- 0+
- Years of experience
- 0M+
- Messages per month
- 0
- Retail banners served
- 0×
- TPS improvement
About
From high-scale backends to AI in production
Who I am
I'm a senior backend engineer with 10+ years of experience building Java systems that move serious volume: distributed microservices, reactive programming, and enterprise messaging platforms processing 100M+ messages a month.
As a technical lead for Fortune 500 retail, I own platforms end to end — architecture, performance, regulatory compliance, and the standards of the team that ships them.
I work remotely with product and engineering teams across the Americas and Europe — clear written communication, real overlap with US time zones.
- Location
- Medellín, Colombia · GMT-5
- Languages
- English (Fluent) · Spanish (Native)
- Availability
- Available for new projects
What I bring
Performance Engineering
10× throughput gains with Java 21 Virtual Threads and reactive architecture
Compliance Architecture
Real-time TCPA enforcement built into the send path — millions in legal exposure removed
Team Leadership
Code reviews, standards, and mentorship for distributed teams
Systems Integration
Third-party and carrier-grade APIs wired into production backends
Core stack
- Java 21
- Spring Boot
- Spring WebFlux
- Kafka
- MongoDB
- GCP
Services
From hands-on engineering to AI in production — six ways I help teams ship
AI Pilot → Production
Your AI pilot impresses in the demo but stalls before launch? I harden it — throughput, resilience, access control, evals, observability — and keep it operating healthily after go-live.
- Production Hardening
- Evals
- Observability
- AI Operations
Architecture & AI Assessments
System design for distributed backends, plus structured AI architecture assessments: a seven-dimension audit of your initiative with a scorecard and a prioritized 90-day plan.
- System Design
- Microservices
- AI Readiness
- 90-day Roadmap
Backend Development
Java and Spring microservices, Kafka pipelines and reactive systems engineered for volume — the same craft behind messaging platforms moving 100M+ messages a month.
- Java 21
- Spring WebFlux
- Kafka
- Microservices
Web Development
Modern web applications end to end — UI, API and deployment — fast, bilingual and SEO-ready. This portfolio is a live sample.
- Next.js
- React
- TypeScript
- Angular
Technical Leadership & Enablement
Lead your distributed team, or plug in as white-label senior capacity for your agency: architecture direction, code reviews, mentorship, and workshops that teach teams to scope and sell AI work.
- Team Leadership
- Code Review
- White-Label Pods
- Workshops
Experience
From first web apps to platforms moving 100M+ messages a month
Technical Lead — Omnichannel Messaging Platform (SMS/MMS/RCS)
Publicis Sapient / Albertsons Companies
Jan 2022 – PresentPlano, TX (Oct 2024 – Present) · Remote, Medellín (Jan 2022 – Oct 2024)
Led end-to-end delivery of a unified SMS/MMS/RCS platform serving 19 grocery and pharmacy retail banners, processing 100M+ messages per month across the full microservices stack.
- TCPA compliance: real-time enforcement layer eliminating opt-in and quiet-hour violations — saved millions in class-action exposure
- Performance: outbound SMS/MMS sends scaled <80 → 500 TPS with Spring WebFlux + Kafka; inbound processing 500 → 5,000 TPS (10×) with Java 21 Virtual Threads, enabling near-real-time campaign tracking
- RCS integration: end-to-end Sinch integration, Google RCS Business Agents, Command Pattern dispatch layer, +30% customer reachability
- Observability: Grafana + Loki stack for real-time delivery monitoring
- Java 21
- Spring WebFlux
- Kafka
- MongoDB
- Sinch
- RCS
- Grafana
- Loki
- TCPA
- GCP
Software Development Analyst Lead
Sofka Technologies / Medellín Metro
Oct 2019 – Dec 2021Medellín, Colombia
Led the modernization of a critical legacy system powering the turnstile network across all 27 stations of Medellín's metro — a system so fragile that any change risked breaking production for the entire transit network.
- Legacy modernization: re-architected the application from scratch, enabling safe deployments for the first time in years
- Hardware integration: worked directly with card-reader manufacturers to configure and integrate new turnstile hardware across all 27 stations
- Real-time validation: implemented card validation logic integrated with turnstile hardware APIs
- Team leadership: code reviews, technical guidance, delivery oversight
- Java
- Spring Boot
- Quarkus
- MySQL
- MongoDB
- Real-time systems
- Hardware integration
Software Development Analyst
INTAP S.A.S / FGA
Sep 2018 – Oct 2019Medellín, Colombia
Full-stack Java developer across multiple client engagements. Key project: end-to-end mobile app for FGA (Fondo de Garantías de Antioquia) enabling loan payments, payment agreements, and account management.
- Built an Ionic/Angular mobile app with a Java/Spring Boot backend — full ownership from API design to deployment
- RESTful APIs for payment processing, agreement management, and customer account operations
- Secure data handling for sensitive financial transactions
- Java
- Spring Boot
- Ionic
- Angular
- MySQL
- SQLite
- RESTful APIs
Specific Programming Manager
SENA
Jan 2015 – Aug 2018Barranquilla, Colombia
Combined teaching and software development role at Colombia's national vocational training institution. Taught object-oriented programming and developed internal web applications to support institutional needs.
- Taught OOP, web development, and programming fundamentals to vocational students
- Developed internal web applications using PHP, HTML, JavaScript, AJAX, and Bootstrap
- Applied continuous improvement practices to curriculum and internal systems
- PHP
- HTML
- JavaScript
- AJAX
- Bootstrap
- OOP
- Teaching
Software Developer
Tecnihardware
Nov 2012 – Aug 2014Barranquilla, Colombia
Early-career role building web applications for the company's operational needs.
- Developed web applications using PHP, HTML, JavaScript, AJAX, and Bootstrap
- Contributed to cross-functional projects aligned to business goals
- PHP
- HTML
- JavaScript
- AJAX
- Bootstrap
Recommendations
Real words from clients and colleagues, lightly condensed.
Lisbey is incredibly talented, thorough, and fast. Honestly, I don't know how I'd do my job without her.
Lisbey is an effective lead who bridges engineering and the client — clear communication, trust, and alignment with business goals. She handles tight deadlines with composure, and exemplifies ownership and empathy.
Lisbey spearheaded the design of our data schemas so everything on the backend fit together seamlessly, working hand in hand with the client's architect. She's always finding new ways to bring a solution to life from the business need — her technical creativity is genuinely inspiring.
Lisbey led the end-to-end move to RCS, our modern messaging channel — driving the technical decisions and making it real. Her work added direct value to how the client engages its customers.
Lisbey is reliable, always on top of things, and a natural mentor — the go-to person when something critical needs unblocking. Releases ship smoothly because of her.
Lisbey is an indispensable expert who untangles complex logic and resolves issues remarkably fast. Her willingness to share knowledge lifts the whole team, and clients consistently recognize the value she brings.
Lisbey was the lead engineer who shipped the Conversation API to production — one of our biggest wins of the quarter.
Tech Stack
The tools I reach for in production
AI & LLMs
- Spring AI
- LangChain4j
- Claude
- OpenAI
- Gemini
- Ollama
- AI Agents
Languages & Frameworks
- Java
- Spring Boot
- Spring WebFlux
- Quarkus
- Angular
- Ionic
- JavaScript
- PHP
Messaging & Architecture
- Apache Kafka
- RCS
- SMS
- Sinch
- REST APIs
- Microservices
Databases
- MongoDB
- SQL
- MySQL
- SQLite
Cloud & DevOps
- Google Cloud
- Azure
- Docker
- GitHub Actions
- Git
Observability
- Grafana
- Grafana Loki
Satisfaction guaranteed
100% Satisfaction Guarantee
If you're not satisfied with my work, I'll make it right — or refund your payment. No questions asked.
Every engagement backed by clear deliverables and open communication
Let's work together
Tell me about your project — I'll get back to you within 24 hours.