Senior Backend & Cloud Engineer

I build backends that carry millions of users

7+ years building cloud-native systems on AWS. I led a banking platform migration that moved 2M+ users and grew transactions 35%. I design serverless backends, real-time data pipelines and AI-powered workflows for fintech and IoT — and I ship the front-end when the product needs it.

Node.js TypeScript AWS Serverless Python Event-driven Claude API / LLMs Docker React / Next.js

Let's talk View experience

Location Venezuela • Remote — available in EST/CST

Focus Backend, Cloud Platforms, Applied AI

Building Zippi — conversational AI, live in production

Products I've built

Things I own end to end — product, infrastructure, and everything in between.

zippi.bot Live in production

Founder • Conversational AI Assistant

Node.js • AWS • LLM APIs

A WhatsApp-based financial assistant where people manage their money entirely through natural language — no forms, no dashboards. Built on Node.js and AWS with LLM APIs using structured outputs for parsing and categorizing every message. I own the product, the infrastructure, and the AI-agent layer.

Real users

Across LATAM

Freemium + $5/mo

Pro tier, revenue-generating

End to end

Product, infra & AI agent

Natural Language UX Claude / LLM APIs Structured Outputs Agentic Workflows WhatsApp API Node.js AWS

Experience

Roles spanning full-stack product work, cloud platforms, distributed systems, and reliability.

Backend & Cloud Specialist — Namutek Fintech

Costa Rica • Remote • Jul 2024–Present • Fintech

AWS CDK • EventBridge • LLMs • Node.js

Lead AI and cloud innovation for fintech integrations — AML/KYC pipelines, tokenization workflows, and intelligent data extraction using LLMs.
Design scalable event-driven architectures on AWS (Lambda, DynamoDB, RDS, EventBridge, SSM Parameter Store) for payment processing and compliance systems serving clients including BAC, one of Central America's largest banks.
Evaluate and integrate third-party AI vendors and APIs, aligning technology decisions with long-term product and regulatory requirements.
Drive backend modernization across internal fintech systems, introducing clean architecture patterns and infrastructure-as-code with AWS CDK.

Senior Backend Engineer — Powerley

Michigan, US • Remote • Nov 2024–Nov 2025 • IoT / Energy Tech

AWS IoT • Lambda • Timestream • ZigBee

Designed and deployed serverless data pipelines using AWS Lambda, IoT Core, DynamoDB and Timestream, processing millions of real-time device telemetry events daily.
Led OTA update orchestration for 10,000+ IoT devices, improving firmware rollout reliability and reducing communication errors by 25%.
Migrated legacy Python services to Node.js 20 microservices with Serverless Framework and Clean Architecture, improving deployment consistency and reducing cold-start overhead.
Built operational dashboards with Amazon QuickSight and CloudWatch, cutting incident response time through improved observability.
Collaborated with hardware and data teams to optimize firmware-to-cloud integrations using AWS IoT Core and the ZigBee stack.

Senior Software Engineer — Namutek Fintech

Remote • Apr 2022–Jul 2024 • Fintech

Node.js • TypeScript • Cognito • Serverless

Orchestrated the migration of 2M+ banking users to a unified fintech platform, improving scalability and boosting transaction volume by 35%.
Refactored authentication and authorization using AWS Cognito and DynamoDB, enabling dynamic roles and fine-grained permissions at scale.
Built internal admin modules and microdeposit approval workflows, reducing processing time by 40% and strengthening auditability for compliance teams.
Implemented structured logging and observability with CloudWatch, decreasing debugging time by 30% and reducing mean time to recovery.
Standardized CI/CD pipelines and serverless deployments with Serverless Framework, improving team velocity and release reliability.

College Professor (Part-time) — Universidad Valle del Momboy

Remote • Jan–Aug 2023

React • Vue • JavaScript • Tailwind

Taught Frontend Development to computer engineering students — React, Vue, JavaScript (ES12+), Tailwind, and testing methodologies.
Designed a hands-on curriculum around component architecture, state management and real project delivery, increasing project completion rates by 25%.
Organized hackathons and technical talks, boosting student participation by 20%.

Technical Lead Backend — CAISerT

Remote • Feb 2021–Mar 2022

Node.js • Vue • GraphQL • Neo4j • Docker

Led distributed teams delivering full-stack solutions with Node.js, Vue, GraphQL, Apollo, Docker and Neo4j.
Introduced Test-Driven Development across the engineering team, reducing post-release defects by 30%.
Designed graph-based data models with Neo4j, supporting complex relationship queries across the product.
Designed event-driven patterns and drove architectural refactors, improving delivery speed by 15–20%.
Mentored junior developers and established code review standards across the team.

Senior Fullstack Developer (Freelance) — TechSynergy

Remote • Jul 2019–May 2022

Node.js • Vue • MongoDB • MySQL • AWS

Built scalable web applications using Node.js, Vue.js, MongoDB and MySQL with AWS service integrations.
Improved overall system efficiency by 30% through architectural optimizations and codebase refactors.
Reduced delivery timelines by 17% by integrating AWS services and improving application security practices.

Technical Expertise

Core technologies, infrastructure, and engineering practices used across production systems.

Frontend

React Next.js TypeScript Tailwind CSS Vue Responsive UI

Backend

Node.js TypeScript Python NestJS REST API Design GraphQL Clean Architecture Event-Driven

AI & LLM Engineering

Anthropic / Claude API OpenAI API Agentic Workflows Tool Calling Structured Outputs Claude Code (daily)

Cloud & Serverless

AWS Lambda API Gateway EventBridge DynamoDB Cognito AWS CDK AWS IoT Core

Containers & DevOps

Docker Docker Compose Serverless Framework CI/CD Pipelines GitHub Actions Terraform

Data, Quality & Reliability

PostgreSQL MongoDB Redis Timestream TDD Observability

Highlights

Selected outcomes demonstrating scope, scale, and senior ownership.

Fintech platform migration

Led backend initiatives supporting the migration of 2M+ users into a unified platform, improving scalability and increasing transaction volume by 35%.

AWS Serverless Distributed Systems Reliability

IoT telemetry & OTA orchestration

Built serverless backends for device telemetry and rollout orchestration, improving connectivity reliability and reducing communication errors by 25%.

AWS IoT Timestream Event-driven Observability

Authorization & security

Designed fine-grained authorization using AWS Cognito + DynamoDB, enabling dynamic roles and audit-friendly access control.

Cognito DynamoDB IAM Security

Featured

Selected open-source work and technical writing.

Open-source Chrome Extension

Better Comments for Bitbucket PRs — improves code review clarity by enhancing PR comment formatting and collaboration.

View on Chrome Web Store

Open Source Developer Productivity Code Reviews

Technical Blog (Hashnode)

Deep-dives on backend engineering, AWS serverless, architecture decisions, and career growth.

Read articles

AWS Backend System Design

Community

Knowledge-sharing and technical communication through BSCode.

BSCode 22K+ followers

Through BSCode I publish technical content for a 22K+ LATAM developer audience — backend engineering, AWS serverless, system design, applied AI, and career growth. It keeps my technical communication sharp and is where I incubate side projects like BookEase, a scheduling SaaS built with NestJS, Prisma, PostgreSQL and Next.js.

Instagram TikTok YouTube Blog

Education & Certifications

Formal education and AWS credentialing.

Computer Engineer — B.S. in Computer Science

Universidad Valle del Momboy • 2017–2021

Computer Science • Systems • Software Engineering

Foundations in software engineering, systems design, and computer science fundamentals.
Honorable mention for thesis work, published in the university's scientific journal: applying a cGAN (pix2pix) neural network architecture to generate building facade images.

AWS Certified Cloud Practitioner

Amazon Web Services

Certification

Validated knowledge of AWS fundamentals, security, pricing, and cloud best practices.

AWS Certified Developer – Associate

Amazon Web Services • Issued Dec 2025 • Valid through Dec 2028

Certification

Validated expertise in developing, deploying, and debugging cloud-native applications on AWS.

AWS Certified AI Practitioner

Amazon Web Services

Certification

Validated fundamentals of AI/ML concepts and AWS AI services for practical, business-oriented use cases.

AWS Certified Solutions Architect – Associate Certified

Amazon Web Services • Issued Jul 2026 • Valid through Jul 2029

Certification

Validated expertise designing distributed systems on AWS — resilient architectures, cost optimization, security, and performance best practices.

Languages

Communication readiness for global teams.

Spanish

Native

English

Full professional proficiency — daily async and live collaboration with U.S.-based teams on specs, architecture, and reviews

Contact

Best way to reach me for senior full-stack, backend, or platform roles.

📧 Email

blsvsanteliz@gmail.com

💼 LinkedIn

linkedin.com/in/brian-santeliz

💻 GitHub

github.com/briansanteliz