Available for new opportunities

Software that ships, from routine APIs to your hardest problems.

Freddy Lemus Barrera — Senior Full Stack Developer with 14+ years building high-performance microservices, distributed systems, and scalable APIs for LATAM's most demanding fintech and banking institutions. Clean Architecture. Event-driven. AI-native workflow.

View selected work LinkedIn GitHub

Trusted by LATAM's leading financial institutions

Scotiabank Colpatria Banco Falabella PayU BBVA Coopeuch Stefanini
14+ Years of craft
8+ Fintech clients
190+ GitHub repositories
2 Countries served
The approach

An AI-native workflow, end to end.

AI tools are not a shortcut — they are a force multiplier woven into my daily craft. Code reviews are sharper, architecture decisions are better-researched, and delivery is measurably faster — never at the expense of quality.

Claude Code
Agentic coding, architecture review, and complex refactors
Cursor AI
Context-aware autocomplete and inline code generation
GitHub Copilot
Real-time pair programming across all IDEs
Amazon Q Dev
AWS-native AI assistance for cloud architecture
AI-native development · Daily practice
Expertise

Built on proven technologies.

A deep, production-tested toolbox for backend-heavy products — from core banking flows to serverless edges.

Backend
  • Java 8–21
  • Spring Boot
  • Spring Cloud
  • Node.js
  • TypeScript
  • Fastify
  • REST / GraphQL
Architecture
  • Microservices
  • Clean Architecture
  • Event-driven
  • Kafka
  • RabbitMQ
  • DDD
  • CQRS
Cloud & DevOps
  • AWS
  • Lambda
  • EKS
  • Docker
  • Kubernetes
  • GitHub Actions
Frontend & Data
  • React
  • React Native
  • Next.js
  • Angular
  • PostgreSQL
  • MongoDB
  • Redis
Selected work

From pull request to production.

A sample of systems shipped end to end — features, refactors, migrations, and greenfield builds.

Fintech · Spring Boot · Kafka
Payment Processing Microservices
High-throughput payment gateway microservices with event-driven architecture, saga pattern, and real-time reconciliation. Deployed on AWS EKS for Scotiabank Colpatria.
Java 17Spring BootKafkaPostgreSQLAWS EKS
EdTech · JAMstack · AWS Lambda
LeoLetras — Children's Reading Platform
Full serverless children's literacy platform. React 19 + Next.js 15 frontend, Node.js + Fastify on Lambda backend, with gamified reading progression system.
Next.js 15Node.jsFastifyLambdaDynamoDB
AI · React · Anthropic API
English Trainer for Developers
AI-powered language learning app with 6 modules tailored for software developers. Built with React and the Anthropic API to deliver contextual, role-specific language coaching.
ReactAnthropic APITypeScriptVite
AI · TypeScript · Vercel AI SDK
AI SDK Chat
Streaming chat application built on the Vercel AI SDK. TypeScript end-to-end, exploring tool calling, structured outputs, and provider-agnostic LLM integration patterns.
TypeScriptAI SDKNext.jsStreaming
Backend · Node.js · Serverless
Serverless Notification Engine
Multi-channel notification microservice (email, SMS, push) using Amazon Pinpoint with Handlebars.js dynamic templating and event-driven queue processing.
Node.jsLambdaPinpointHandlebarsSQS
Banking · Java · RabbitMQ
Banking Backend — Event-Driven Core
Java microservice for banking operations with JPA persistence and RabbitMQ messaging. Demonstrates event-driven integration patterns applied to core banking flows.
JavaSpring BootJPARabbitMQ
Explore all 190+ repositories
Experience

Fourteen years of delivery.

A career built inside LATAM's most demanding banking and fintech environments.

2024 — Present
Stefanini Group
Senior Full Stack Developer

Leading backend microservices and React Native mobile development for banking clients across LATAM. Building event-driven systems on AWS EKS and delivering cross-platform iOS/Android features.

Spring BootReact NativeAWSKafka
2021 — 2024
Scotiabank Colpatria
Backend Developer

Designed and deployed payment processing microservices and credit simulation APIs handling high-volume transactions. Implemented Clean Architecture patterns across the Java/Spring Cloud stack.

JavaSpring CloudPostgreSQLDocker
2018 — 2021
Banco Falabella / PayU
Senior Backend Developer

Built fintech backend services for PayU's LATAM payment gateway and Banco Falabella's digital banking products. Node.js APIs, distributed caching with Redis, and event-driven integrations.

Node.jsRedisMySQLAWS
2010 — 2018
BBVA / Coopeuch
Java Developer → Tech Lead

8 years progressing from Java developer to tech lead on banking platform modernization projects. Core banking integrations, RESTful API design, and team mentoring across Colombia and Chile.

Java EESpring MVCOracleSOA
Arctic Code Vault Contributor Pull Shark ×2

Let's build something exceptional.

Open to senior backend, full stack, and tech lead roles.
Bogotá, Colombia · Remote-friendly.

freddy.andres.lemus.barrera@gmail.com
LinkedIn GitHub