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Aleksandar Vasic

@aleksandarvasic

Senior Frontend Engineer at Bluegrass, maintaining applications and building a shared-code Next.js and Expo React Native app.

Serbia

Message

At Bluegrass, I maintain existing applications and build a new one in a monorepo that shares code between Next.js and Expo React Native.

At Quipu Gmbh, I worked on rebuilding mobile banking applications for multiple countries. I focused on React Native and created Kotlin and Swift native bridges to integrate third-party SDKs, while also contributing to .NET microservices.

At Ananas E-Commerce, my team improved app stability by fixing critical bugs and introducing end-to-end tests, reducing the crash rate from 4.5% to 1.3%. We also lowered memory consumption, optimized caching, and eliminated unnecessary API calls.

At VEGA IT SIGMA, I contributed to more than 20 React Native applications and served as Tech Lead on a complete rebuild of a mobile application used by over a million users. I’ve also assembled a small team to deliver an MVP and designed its system architecture.

Experience

Work history, roles, and key accomplishments

Current

Senior Frontend Engineer

Current

Bluegrass

Nov 2025 - Present (11 months)

Maintained existing applications and built a new one using a monorepo, sharing code between Next.js and Expo React Native.

React Native Next.js Expo Monorepo

Senior Software Engineer

Quipu GmbH

Oct 2024 - Nov 2025 (1 year 1 month)

Worked as a Full Stack Engineer on rebuilding mobile banking applications for multiple countries, focusing on React Native and creating native bridges in Kotlin and Swift. Contributed to backend development using .NET microservices with Azure Service Bus, Docker, and MongoDB.

React Native Kotlin Swift .NET Microservices DDD Azure Service Bus Docker MongoDB

Mobile Engineer

Ananas E-Commerce

Jun 2024 - Nov 2024 (5 months)

Improved app stability by fixing critical bugs, introducing end-to-end tests, and reducing crash rate from 4.5% to 1.3%. Enhanced performance by lowering memory consumption, optimizing caching strategies, and eliminating unnecessary API calls.

React Native E2E Testing Performance Optimization Caching

Team Lead and Software Engineer

Jitter Solutions Corp

Jul 2023 - Jun 2024 (11 months)

Assembled and led a small team to deliver the first MVP. Designed the architecture of the entire system using React Native, Next.js, .NET, Vercel, and AWS.

React Native Next.js .NET Vercel AWS

Software Engineer

Vega IT Sigma

Aug 2021 - Jun 2024 (2 years 10 months)

Worked primarily as a React Native developer, led a team, and supported other teams with feature implementation, mentorship, and code reviews. Contributed to over 20 React Native applications and served as Tech Lead in a complete rebuild of a mobile app used by over a million users.

React Native Redux Thunk Redux Saga Zustand Jotai React Query Firebase AWS Amplify OneSignal Expo Jest Detox Java Objective C

Full Stack Engineer

Digital Arts Agency

Feb 2021 - Jul 2021 (5 months)

Integrated new features and maintained an e-commerce website using PHP, JavaScript, and SQL databases, ensuring smooth functionality and continuous performance improvements.

PHP JavaScript SQL

Front-End Engineer

Brame (Branded Game)

Sep 2020 - Jan 2021 (4 months)

Developed highly customizable game templates, including memory games and quizzes, using HTML, CSS, and vanilla JavaScript. Integrated templates into an Angular builder for the first MVP.

HTML CSS JavaScript Angular