Jacob Twardowski, Developer in Chicago, IL, United States
Jacob is currently unavailable

Jacob Twardowski

React Native Developer

Chicago, IL, United States

Toptal member since March 4, 2026

Expertise
React NativeReduxReact.jsMacOSREST APIJavaScriptStripe Development
Bio

Jacob is a React Native developer who builds clean, high-performing mobile applications. He focuses on structure, scalability, and user experience. Jacob values clear communication and takes pride in turning ideas into reliable, well-built products that teams feel confident shipping.

Portfolio

Replient
Symfony 4, React, React Native, Redux, REST APIs, JavaScript 6, Expo, Stripe

Experience

  • APIs - 4 years
  • Symfony 4 - 4 years
  • REST APIs - 4 years
  • Redux - 4 years
  • Expo - 4 years
  • React - 4 years
  • React Native - 4 years
  • Stripe - 2 years

Preferred Environment

MacOS, React Native, Redux, Expo, REST APIs, JavaScript 6, React, Symfony 4

The most amazing...

...thing I've developed is StrenvoAI, which combines my love for fitness and software into something I genuinely use.

Work Experience

Software Engineer

2024 - 2026
Replient
  • Developed a full-stack fundraising platform using Symfony and React and integrating Stripe and Stripe Connect to automate vendor payouts and campaign revenue distribution.
  • Optimized list rendering and performance for data-heavy screens, improving load times and user experience.
  • Built and integrated RESTful APIs using Symfony, enabling secure authentication and real-time data updates.
  • Developed cross-platform mobile features using React Native and Expo.
Technologies: Symfony 4, React, React Native, Redux, REST APIs, JavaScript 6, Expo, Stripe

Experience

StrenvoAI

https://strenvoai.com/
StrenvoAI is an adaptive strength training app built with React Native and a custom back end to deliver personalized workout programming and performance insights.

I developed the mobile application and implemented an AI-powered assistant that integrates multiple AI provider APIs to generate workout adjustments and respond to user questions in real time. I also designed the architecture to support scalable training logic, progress tracking, and reliable API routing between providers.

The project combines clean software design with my personal passion for fitness, resulting in a product I actively use and continue to improve.

Skills

Libraries/APIs

React, REST APIs, Stripe

Tools

Expo

Frameworks

React Native, Redux, Symfony 4

Languages

JavaScript 6

Platforms

MacOS, RevenueCat

Other

APIs

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