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Roman Alekseev

@romanalekseev

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Senior software engineer specializing in React and React Native mobile experiences.

Ukraine

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What I'm looking for

I’m looking to build and lead high-performance React/React Native products, optimize responsiveness, and deliver scalable UI/UX. I thrive in cross-functional, fast-paced Agile teams where I can mentor others and improve code quality.

I’m a Senior Software Engineer with 7+ years of experience building high-performance web and mobile applications. I specialize in React, React Native, and modern JavaScript ecosystems, with a clear focus on scalable, user-centric solutions.

In my recent role at Avenga (May 2022 – Jan 2026), I led development of mobile and web applications using React and React Native. I designed and implemented cross-platform features for iOS and Android, and I optimized application performance to reduce load times and improve responsiveness across devices.

Earlier at Avenga (Nov 2018 – May 2022), I developed and maintained complex web applications using React.js and TypeScript. I integrated REST APIs to improve data handling, implemented reusable components, and worked in Agile teams to deliver features on time and within scope.

Before that, I built interactive web experiences at Web-systems.solutions and WebEx, converting UI/UX into pixel-perfect frontend components and integrating REST APIs for smooth data flow. I mentor junior developers, contribute to code reviews, and collaborate closely with product managers and designers to ship intuitive UI/UX that customers actually feel.

Experience

Work history, roles, and key accomplishments

Senior Software Engineer

Avenga

May 2022 - Jan 2026 (3 years 8 months)

Led development of mobile and web applications using React and React Native, delivering scalable, high-performance solutions. Designed cross-platform iOS and Android features, optimized performance to improve load times and responsiveness, and mentored junior developers through code reviews.

React React Native TypeScript Performance Optimization Cross Platform Development Code Review

Frontend Engineer

Avenga

Nov 2018 - May 2022 (3 years 6 months)

Developed and maintained complex web applications with React.js and TypeScript. Integrated REST APIs, implemented reusable components and scalable architecture, and delivered features in Agile teams on time and within scope.

React TypeScript RESTful APIs Agile Scrum CI CD Data Integration

Frontend Developer

Web-systems.solutions

Aug 2015 - Nov 2018 (3 years 3 months)

Built complex, interactive web applications using JavaScript, HTML5, and CSS3. Converted UI/UX designs into pixel-perfect frontend components and delivered dynamic forms, dashboards, and data tables with REST API integration.

JavaScript HTML5 CSS3 Pixel Perfect UI Implementation Dashboards Data Tables API Integration

Frontend Developer

WebEx

Apr 2015 - Aug 2015 (4 months)

Developed web interface components and supported frontend bug fixes and updates. Gained early experience implementing client-facing features with JavaScript and HTML/CSS frameworks.

JavaScript HTML5 CSS3 UI Components Framework