Ranielli Montagna

Learn more about me

About Me

Hello! I'm Ranielli Montagna, a software engineer with 5+ years building web and mobile products that need to scale. I worked with React, React Native, TypeScript, Node.js and Next.js on products that demanded performance and a great experience. Today I work beyond the code: engineering, product and business in the same conversation.

At Lemon Energia, a distributed-generation energytech, I sit at the bridge between business and technology: I run discovery, translate complex rules into full stack solutions and weigh product trade-offs. In parallel I am co-founder of Atto, a software house and marketing studio that builds custom products for companies — from e-commerce to AI automation. Before that, at Luizalabs (Magalu), I developed solutions for 1,000+ store operations and the daily workflow of 1,000+ stock clerks, led frontend initiatives, created a Design System adopted across multiple products and mentored developers.

One of the areas that drives me most is AI applied to development and operations: LLMs, automation, agents, and the Model Context Protocol (MCP). I use it as a lever for productivity and product evolution, always with critical review.

05+

Years of experience

20+

Projects completed

Resume

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Ranielli Montagna

My professional journey

Professional Experience

5+ years building web and mobile applications, APIs, and product interfaces with a focus on scale, performance, accessibility, technical quality, and measurable impact.

My professional journey

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Software Engineer

Lemon EnergiaJuly 2026 - PresentRemote

I bridge business and technology, investigating operational problems and turning complex energy-journey rules into full-stack solutions. I lead continuous discovery, document decisions and requirements, and use AI with critical review to accelerate reliable, scalable deliveries with measurable impact.

Key achievements:

Business-team discovery to clarify needs and requirements

Building AI-first full-stack solutions

Critical review of AI output before product use

Pragmatic evaluation of product and technical trade-offs

Technologies used:

JavaScriptTypeScriptNode.jsReactAIAutomation

02 / 04

Mid-level Developer

LuizalabsOctober 2023 - June 2026Remote

I worked at Luizalabs, Magalu's technology unit, developing web and mobile applications for physical store operations, REST APIs, and backend solutions for a high-scale national retail environment.

Key achievements:

Developed solutions used in inventory and logistics operations across 1,000+ stores

Contributed to the daily workflow of 1,000+ stock clerks in corporate applications

Maintained REST APIs, integrations, and micro frontends with React, React Native, Node.js, and TypeScript

Collaborated with Product, UX, Backend, and Operations to connect technical decisions to business impact

Technologies used:

ReactReact NativeTypeScriptNode.jsAPIs REST

03 / 04

Front-end Tech Lead

SmartenMay 2022 - September 2023Remote

I worked as a Front-end Tech Lead in SaaS products, leading developers, defining quality standards, evolving interface architecture, and connecting technical decisions to product delivery.

Key achievements:

Technically led a team of developers

Created and maintained a Design System adopted across multiple products

Implemented CI/CD, monitoring, and quality standards

Mentored developers and improved performance, maintainability, and scalability

Technologies used:

JavaScriptReactDesign SystemCI/CDMonitoramento

04 / 04

Front-end Developer

SBSistemasMay 2021 - May 2022On-site

I consolidated my professional foundation in front-end development, building applications with a focus on usability, maintainability, typing, reusable components, and engineering best practices.

Key achievements:

Developed front-end applications with React, Electron, TypeScript, and JavaScript

Implemented reusable components and interface standards

Applied maintainability, testing, and code quality practices

Built a solid technical foundation for web products

Technologies used:

ReactElectronTypeScriptJavaScriptFront-end

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