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Fedir Tsarenko

@fedirtsarenko

Senior Lead Software Engineer at SmartCrowd, where I integrated an AI agent into an investment app and managed a team of six engineers.

Georgia

Message

At SmartCrowd, I designed backend services and APIs integrated with React applications, and structured backend and micro-frontend architectures. I also integrated an AI agent into an investment app and managed a team of six engineers.

At Sure Petcare, I led development of mobile applications and backend services for IoT pet devices, from architecture through production release. I built device-connected APIs and modular UI libraries, and set up testing and Fastlane CI/CD pipelines.

At Career Karma, I led development of a mobile app that helped users discover and join bootcamps. I built reusable features with Next.js and React Native and improved app startup time and memory usage.

At Clinical ink, I re-architected a legacy React Native app as a modular platform and developed reusable components. I also built user-facing features for medical workflows, wrote unit tests, and mentored junior developers.

Experience

Work history, roles, and key accomplishments

Senior Lead Software Engineer

SmartCrowd

Dec 2025 - Oct 2026 (10 months)

Designed scalable backend services and APIs integrated with React applications, and structured robust architectures for backend and micro-frontends. Led cross-functional collaboration, mentored engineers, and managed a team of 6 engineers.

React Backend Services APIs Micro Frontends Architecture Mentorship Team Leadership Testing

Senior Software Engineer

Sure Petcare

Aug 2022 - Dec 2025 (3 years 4 months)

Led end-to-end development of mobile applications and backend services for IoT pet devices, from architecture design to production release. Established code quality standards, built CI/CD pipelines, and integrated A/B testing with Firebase.

IoT Mobile Development Backend Services APIs Architecture Jest Appium Fastlane Firebase AWS Datadog CI CD A B Testing

Senior Next/React Native Engineer

Career Karma

Dec 2021 - Jul 2022 (7 months)

Led development of a mobile application aiding users in discovering and joining bootcamps. Implemented high-performance, reusable features with Next.js/React Native and optimized app startup time and memory usage.

Next.js React Native Performance Optimization Code Splitting State Management Unit Testing Code Review

Senior Frontend Developer

Clinical ink

Dec 2020 - Dec 2021 (1 year)

Re-architected and bootstrapped a legacy React Native app into a scalable, modular platform using clean architecture principles. Implemented reusable component libraries, mentored junior developers, and reduced app bundle size significantly.

React Native Clean Architecture Component Libraries Performance Optimization Unit Testing Mentorship Lazy Loading