David M. Jentjens
David M. Jentjens
Senior Frontend Engineer · Independent Contractor
Profile

Senior frontend engineer with 7+ years building enterprise-scale web applications. Currently working as an independent contractor through my own consultancy, Sharply Technologies, delivering frontend and full-stack solutions for international clients on long-term engagements.

Most recently, I was frontend lead on GSPT at PepsiCo, a React/TypeScript planning tool used across global markets for supply chain optimization, where I led the migration from MUI to the Peacock design system and optimized data-heavy planning screens for performance. Since 2023, I've also led development teams at Intelltech building software for major mining clients including Vale and Anglo American, with a focus on real-time monitoring interfaces for geological data. That scope also covers CI/CD pipeline architecture, and I led a GitLab to GitHub Enterprise Cloud migration across ~60 repositories.

My work spans scalable UI architecture, design system implementation, and full-stack development with Node.js, and I'm comfortable owning full-stack concerns when a project calls for it. CS degree from PUC-Rio. Fluent in English, German, and Portuguese.

Technical Skills
Frontend: React, TypeScript, Next.js, HTML, CSS, JavaScript
Backend: Node.js, C#, Python, REST APIs
Databases: PostgreSQL, Redis, MongoDB
DevOps: CI/CD, Git, GitHub Actions, GitLab CI
Other: Agile, Design Systems, Machine Learning
Languages
PortugueseNative
GermanFluent
EnglishFluent
FrenchBasic
Work Experience
Sharply Technologies logo
Independent Software Contractor
Sharply Technologies · Contract
2026 - Present
Remote · International clients
Delivering frontend and full-stack solutions for international clients through my own software consultancy, via long-term contract engagements.
PepsiCo logo
Frontend Lead
PepsiCo (via Turing) · Contract
Oct 2024 - 2026 · 1 yr 8 mos
Plano, TX · Remote
Led frontend development of GSPT (Global Seed Planning Tool), a React/TypeScript application used for potato seed supply chain optimization across global markets. Drove the migration of the UI layer from MUI to PepsiCo's Peacock design system, rebuilding shared components and aligning the codebase with the new system. Built data-heavy enterprise screens over REST APIs and optimized rendering and load performance for large planning datasets. Coordinated with distributed backend and design teams across the US and India, delivering features end-to-end in Agile sprints with full QA ownership.
Intelltech logo
Senior Software Engineer
Intelltech · Contract
Mar 2023 - Present · 3 yrs 6 mos
Foz do Iguaçu, Paraná, Brazil · Remote
Software development and technical leadership for mining industry clients including Vale, Usiminas, and Anglo American. Ongoing scope includes CI/CD pipeline architecture, design system maintenance, DevOps documentation, and strategic technical reports to leadership. Led a GitLab-to-GitHub Enterprise Cloud migration across ~60 repositories.
Portal Solar logo
Full Stack Developer
Portal Solar · Full-time
Jan 2023 - Apr 2023 · 4 mos
São Paulo, Brazil · Remote
Developed SEO-optimized institutional sites with Next.js & Ruby on Rails backend. Created & maintained Solaris design system for React/React Native apps.
Tmov logo
Full Stack Developer (React + Node)
Tmov · Full-time
Mar 2022 - Jan 2023 · 11 mos
Londrina, Paraná, Brazil · Remote
Built transportation logistics platform connecting cargo shippers with truckers. Tech stack: React, Node.js, .NET Core, SQL Server.
ICA PUC-Rio logo
Full Stack Developer
ICA PUC-Rio · Full-time
Aug 2018 - Mar 2022 · 3 yrs 8 mos
Rio de Janeiro, Brazil
Developed React interfaces & AI solutions for enterprise clients including Petrobras & Intel. Full-stack development using React, Node.js, C#, and Python across multiple high-impact projects.
Education
PUC-RIO, 2018–2021
Bachelor of Computer Science
Verified Digital Diploma ↗
UFRJ, 2017–2018
BA Computer Science (transferred to PUC-Rio via scholarship)
Certifications
Anthropic logo
Claude Certified Architect – Foundations (CCA-F)
Anthropic, 2026
View Certificate
Udacity logo
User Experience Nanodegree
Udacity, 2022
View Certificate
Udacity logo
Machine Learning Engineer Nanodegree
Udacity, 2021
View Certificate
Contact
Email:
davidjentjens@gmail.com