Senior Full Stack Developer

Freddy
Lemus
Barrera

14+ years building high-performance microservices, distributed systems, and scalable APIs for LATAM's top fintech and banking clients. Clean Architecture. Event-driven. AI-native workflow.

View projects LinkedIn →
14+ Years exp.
8+ Fintech clients
100% AI-native
Key clients
Scotiabank Colpatria Banco Falabella PayU BBVA Coopeuch Stefanini
AI-first approach

Engineering
with AI
as a multiplier

AI tools are not a shortcut — they're a force multiplier in my daily workflow. Code reviews are faster, architecture decisions are better-researched, and shipping is measurably quicker without sacrificing quality.

AI-native development · Daily workflow
⚡
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
Technical stack

Built on proven
technologies

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

What I've
built

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 17 Spring Boot Kafka PostgreSQL AWS EKS
View on GitHub
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 15 Node.js Fastify Lambda DynamoDB
View on GitHub
AI · React · Anthropic API
English Trainer for Devs
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.
React Anthropic API TypeScript Vite
View on GitHub
Mobile · React Native · iOS & Android
Banking Mobile App
Cross-platform mobile banking application for LATAM market. Full feature parity on iOS and Android with biometric auth, push notifications, and offline support.
React Native TypeScript Redux AWS Pinpoint
View on GitHub
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.js Lambda Pinpoint Handlebars SQS
View on GitHub
DevOps · AWS · Spring Boot
Credit Simulation API — EKS Deployment
Spring Boot credit simulation microservice deployed to AWS EKS with JVM tuning, Kubernetes health probes, and automated rollback pipeline via GitHub Actions.
Spring Boot Docker Kubernetes AWS EKS GitHub Actions
View on GitHub
Experience

14 years of
delivery

2024 – 2026
Stefanini Group
Senior Full Stack Developer
Led backend microservices and React Native mobile development for banking clients across LATAM. Built event-driven systems on AWS EKS and delivered cross-platform iOS/Android features over 8 months.
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
Contact

Let's build
something great

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

✉ Email in LinkedIn { } GitHub