Open to opportunities

Dennis Cesti Castro

@denniscesticastro

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I build scalable web, mobile, and AI-focused software with JavaScript, PHP, and Python.

Peru

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What I'm looking for

I'm looking to build scalable web, mobile, backend, or AI-focused products where clean code, modernization, automation, and measurable business results matter.

I've built web, mobile, and backend products for Alignerr, Little Sane Village OÜ, PeopleCor, and Peruvian technology companies. My work spans AI code evaluation, Laravel and React applications, Flutter mobile development, and modernizing legacy systems.

At Alignerr, I review AI-generated code, identify bugs and edge cases, and design prompts and test scenarios for real-world engineering tasks. At Revelo, I built React/Next interfaces, improved data-labeling workflows for LLM post-training, and resolved issues in Python libraries using AWS SageMaker.

I've delivered certification platforms, electronic invoicing APIs, e-commerce modules, telemetry backends, and Android applications. I focus on clean, efficient code that supports business goals, reliable integrations, and maintainable products.

Experience

Work history, roles, and key accomplishments

Current

AI Model Trainer

Current

Alignerr

Jan 2026 - Present (7 months)

Review and evaluate AI-generated code across complex software engineering tasks, identifying bugs and providing feedback on model strengths and weaknesses.

Python PHP JavaScript Code Review Debugging Test Case Design

Current

Full Stack Developer

Current

Little Sane Village OÜ

Feb 2023 - Present (3 years 6 months)

Develop new features for web applications using TALL Stack, Laravel, Livewire, Filament, and Vue.js, and build multiplatform mobile applications with Flutter. Migrate legacy code to latest versions and write automated tests.

Laravel Livewire Filament Vue.Js Flutter PHPUnit TALL Stack

AI Trainer

Revelo

Jun 2025 - Jan 2026 (7 months)

Develop UI interfaces using React/Next to reinforce AI model learning, identify and resolve bugs in Python libraries, and devise data labeling workflows for LLM post-training.

React Next.js Python AWS Sagemaker Data Labeling Debugging

Full Stack Developer

PeopleCor - Dairy Coach LLC

Nov 2024 - May 2025 (6 months)

Design and implement new features for the Peoplecor web application using React and Laravel, create and optimize database ER diagrams, and convert legacy Blade templates to React.

React Laravel Database Design Manual Testing

Software Developer

Gestión de Armado y Manufactura Técnica S.A.C

Nov 2022 - Oct 2024 (1 year 11 months)

Built new modules for web and mobile applications using Laravel, React, and React Native, executed AWS migrations, and performed database optimization.

Laravel React React Native AWS CLI SQL Database Optimization

Senior Developer

Que tal compra del Peru S.A.C.

Jul 2022 - Nov 2022 (4 months)

Maintained and developed new modules for e-commerce websites using Magento 2, implemented Android app features with Java, and integrated third-party software.

Magento Java Android

Developer Analyst

Innova Scientific S.A.C

May 2022 - Jul 2022 (2 months)

Enhanced convenience store and book editorial management software using Laravel and Bootstrap, optimized databases, and resolved electronic invoicing issues.

Laravel Bootstrap SQL Debugging e invoicing