Kéllen Kern | Software Engineer

About Me

Software that ships, from interface to backend

I am a software engineer with 5+ years of experience building web and mobile products. I work across React, Next.js, TypeScript, React Native, and Python, from the interface through the backend.

At 3035 Tech I contribute to multidisciplinary teams shipping web and mobile systems and AI features powered by large language models. Before that, I built recommendation systems at Cool Tea Company and secure web applications at Dorak CyberSec.

I focus on software that stays scalable, follows secure defaults, and feels clear to the people using it.

Campo Bom, Rio Grande do Sul, Brazil

Languages

PortugueseNative
EnglishFluent
SpanishAdvanced

Technologies

React
Next.js
TypeScript
JavaScript
Python
React Native
Node.js
Angular
Ionic
PostgreSQL
Git
LLMs

Resume

Experience

Software Engineer
3035 Tech · Brazil
May 2023 — Present
- Build web and mobile products on a multidisciplinary team with React, Next.js, TypeScript, React Native, Angular, and Ionic.
- Ship AI-based systems, including features powered by large language models.
- Deliver interfaces and backends with a focus on scalability and efficiency.
- React
- Next.js
- TypeScript
- Python
- React Native
- Angular
- Ionic
- Node.js
- PostgreSQL
- Git
Software Engineer
Cool Tea Company · Brazil
Jul 2022 — Mar 2023
- Built personalized recommendation systems with artificial intelligence from user data.
- Implemented recommendation algorithms in Python that improved efficiency and the end-user experience.
- Developed interactive, scalable web features with React and TypeScript.
- React
- TypeScript
- JavaScript
- Python
- LLMs
Software Engineer
Dorak CyberSec · Brazil
Dec 2021 — Jul 2022
- Developed secure web applications with React and TypeScript.
- Applied cybersecurity best practices with the security team so applications were protected against common vulnerabilities.
- React
- TypeScript
- JavaScript

Education

2023

Bachelor's in Systems Analysis and Development

Universidade Feevale

2019

Technical degree

Instituto Federal de Educação, Ciência e Tecnologia

CertificationsShow

AI

Artificial intelligence inside real products

Most of my AI work is applied: language models and recommendation systems delivered as part of web and mobile software, not as isolated experiments.

Language models in products

I build product features on top of large language models, connecting the interface, the application logic, and the model so the feature is usable in production.

Recommendation systems

At Cool Tea Company I implemented personalized recommendation algorithms in Python, using user data to improve relevance and the experience of the product.

AI across the stack

The same work includes the surrounding software: React and Next.js interfaces, Python and Node.js services, and delivery on both web and mobile.

Contact

Open to new opportunities

I am looking for software engineering roles where I can build web, mobile, and AI products. The fastest way to reach me is email.

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