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Danillo User

@danillouser

Senior Frontend Engineer at Mitra, shaping an AI-powered application platform with isolated code execution and customer-specific domains.

Brazil

Message

At Mitra, I’ve worked on the same multi-tenant B2B SaaS platform since 2019, from its Vue visual editor to its cloud-native React platform, where AI agents generate applications in an isolated sandbox. I designed how the front end connects to 16 microservices and worked on publishing customer applications to custom domains through dynamically provisioned DNS and CloudFront.

I chose the architecture for the Nuxt generation and built a Node.js BFF connecting the interface to the Java API. My work also includes customer-specific branding and access controls, dynamic tenant resolution, and addressing security findings across the front end and server layer.

Experience

Work history, roles, and key accomplishments

Current

Senior Frontend Engineer, Full-stack & AI

Current

Mitra

Mar 2026 - Present (7 months)

Front-end specialty on the cloud-native platform in React, also working across some back-end layers and the product's AI layer.
• Designed how the front end talks to the platform's 16 microservices.
• App publishing on the customer's own domain, with custom DNS provisioned dynamically and served through CloudFront, 2x faster.
• Execution and interaction with the E2B sandbox, infrastructure in Terr

Senior Frontend Engineer

Mitra

Jul 2022 - Mar 2026 (3 years 8 months)

Front-end architecture for the platform's Nuxt generation.
• Chose the stack and architecture for the new front end, starting from the Vue the team already knew.
• BFF layer in Node.js, with the serverless functions that ran the product's first generation of AI.
• Moved on to isolated execution in an E2B sandbox: from generating screens to generating whole applications.
• Firebase integration to c

Frontend Engineer

Mitra

Jan 2019 - Jun 2022 (3 years 5 months)

First generation of the platform: a multi-tenant B2B SaaS where companies assemble corporate applications without writing code.
• Took part in building the product from its first month, in Vue 2. The team was small, so a lot of structural and interface decisions were mine from the start.
• Visual drag-and-drop editor, so customers could assemble their own application by dragging components and set

Frontend Developer

Zup Innovation

Aug 2018 - Jan 2019 (5 months)

Early in my career, part-time: fixing bugs in a banking system built with Angular 2+, on a team running Scrum, plus internal projects to get a grip on the framework.