Open to opportunities

Sarah Bello

@sarahbello

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Senior Full Stack Engineer specializing in scalable backend and AI platforms.

Brazil

Message

What I'm looking for

I seek impactful roles building scalable backend and AI platforms with strong engineering practices, observability, and opportunities to lead architecture and reliability improvements.

I am a Senior Full Stack Engineer with 10+ years building cloud-native, high-performance backend and AI-powered platforms across AdTech, Cloud Infrastructure, Industrial Construction, Enterprise Automation, and Telecommunications. I specialize in Python (FastAPI, Django), Rust, and TypeScript (Node.js, Express.js, NestJS), and I design systems using Clean Architecture, DDD, SOLID, and TDD to ensure maintainability and reliability.

I've architected and implemented production-grade systems from scratch, integrated LLM-based agents and orchestration (LangChain, LangGraph), and scaled services on AWS and Azure using Terraform, Kubernetes, and serverless patterns. I prioritize observability, automated testing, and cost-efficient performance improvements, having driven large test suites, CI/CD hardening, and latency reductions through Rust services.

Experience

Work history, roles, and key accomplishments

Current

Senior Backend / AI Engineer

Current

Stamp

Jan 2024 - Present (2 years 1 month)

Architected and implemented a high-scale AdTech backend using FastAPI, Django and Node.js, delivering real-time campaign automation and AI-driven decision systems that handled large concurrent workloads. Built production LLM agents and orchestration pipelines with LangChain/LangGraph, applied TDD to reach 800+ automated tests, and managed AWS/Terraform/Kubernetes infrastructure for reliable deploy

Python fastAPI Django Node LLMs (LangChain LangGraph AWS Terraform Kubernetes TDD

Senior Backend Developer

Entri LLC

Jan 2023 - Jan 2024 (1 year)

Designed and implemented serverless frameworks and distributed automation services using AWS CDK, Lambda, API Gateway and DynamoDB to support large-scale DNS configuration management, introducing Rust services to reduce latency and infrastructure costs. Improved observability and CI/CD quality gates to increase reliability.

AWS CDK AWS Lambda DynamoDB Python Rust Serverless CI CD Observability CloudFormation

Backend Developer

Shape

Jun 2021 - May 2022 (11 months)

Developed backend microservices and modular APIs using Django, FastAPI, Flask and Node.js to support industrial construction and offshore operations, implemented RabbitMQ-based asynchronous processing, and optimized relational models on SQL Server and PostgreSQL to improve reporting accuracy.

Django fastAPI Flask Node NestJS RabbitMQ PostgreSQL SQL Server Azure DevOps Microservices

Full Stack Developer

Capgemini

Aug 2020 - Jun 2021 (10 months)

Delivered enterprise productivity systems and analytics platforms using Django, Flask and Node.js backends with React/TypeScript front-ends, building RESTful APIs and automations that reduced manual workload and improved reporting usability.

Django Flask Node React TypeScript REST APIs NestJS Automation

DBA & Backend Developer

Ericsson

Jun 2018 - Nov 2020 (2 years 5 months)

Optimized Oracle databases via indexing and query tuning for carrier-grade telecom systems and built Python/Node.js automation tools and internal APIs to streamline ticket processing and improve platform stability.

Oracle SQL Python Node Monitoring Automation Telecom

Education

Degrees, certifications, and relevant coursework

Universidade Federal Fluminense

Bachelor of Engineering, Electrical Engineering

2014 - 2022

Completed a Bachelor of Electrical Engineering covering core electrical engineering principles and applied systems relevant to software and infrastructure domains.