Open to opportunities

Ognjen Lazić

@ognjenlazi

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Senior software engineer shipping mobile apps across Android, iOS, and cross-platform stacks.

Serbia

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What I'm looking for

I’m looking for a team where I can build and lead end-to-end mobile and full-stack products—especially AI-driven systems—while mentoring engineers and shipping high-quality Android, iOS, and React Native experiences.

I’m a Senior Software Engineer with 5+ years shipping mobile applications across Android, iOS, and cross-platform stacks. I care about building end-to-end systems that feel fast, reliable, and polished—especially when AI and real-time integrations are involved.

At Entra, I lead a team of 2 developers while building a community access and control system, including a React Native app. I also design an AI multi-channel reservation system, owning the full AI infrastructure and end-to-end automation, and I deliver a full-stack hospitality platform with companion tvOS and Android TV applications.

Earlier, I built native Android and iOS products using Kotlin and Swift, including maintaining a Sleep Number application for 1M+ active users and shipping an iOS IPTV app with 10K+ daily active users. Through freelance work and my UstavAI project, I’ve delivered production apps in Flutter and SwiftUI and built an AI legal assistant with a RAG pipeline, source-cited answers, and a rich in-browser document experience.

Experience

Work history, roles, and key accomplishments

Current

Full-Stack Software Engineer & Team Lead

Current

Entra

Nov 2025 - Present (8 months)

Builds a community access and control system, including a cross-platform mobile app in React Native and a full-stack hospitality platform with tvOS and Android TV applications. Leads a team of developers and delivers AI-driven reservation automation, including integrations with messaging APIs.

React Native AI Infrastructure Multi Channel Reservations Full Stack Developer Team Leadership Technical Mentorship TvOS Development Android TV Facebook Messenger API Webhooks Communication APIs

Current

Freelance Software Engineer

Current

Independent Contractor

Mar 2020 - Present (6 years 4 months)

Delivered multiple mobile applications, including a government-issued step-tracking app in Flutter with Firebase and an iOS IPTV app with live streaming and TV archive. Built native Android and iOS museum apps featuring image-recognition for exhibit identification.

Flutter Firebase Step Counter iOS IPTV Swift SwiftUI TV Archive Native Android XML Image Recognition

Senior Android Engineer

Etera Technologies

Sep 2024 - Apr 2026 (1 year 7 months)

Built a native Android tourist-guide app in Kotlin and Jetpack Compose with an AI assistant backed by GraphQL and WebSocket. Implemented performant UI/UX including custom animations and AI-driven server-side rendering for content, and helped design server-driven UI data structures and mobile/backend data contracts.

Kotlin Jetpack Compose GraphQL WebSockets Custom Animations Server Driven UIs Server Side Rendering

Android Engineer

Klika

May 2023 - Oct 2024 (1 year 5 months)

Maintained and extended the Sleep Number application for 1M+ active users in the US market, building customer-facing features for smart-bed settings and detailed sleep analytics. Developed responsive interfaces using Kotlin and Jetpack Compose to modernize a legacy codebase.

Kotlin Jetpack Compose Mobile App Maintenance Smart Bed Settings

iOS and Android Developer

Make TV

Sep 2021 - May 2023 (1 year 8 months)

Built an Android crypto wallet app from zero to production using native Kotlin and XML. Refactored the IPTV iOS app using Swift and UIKit, improving stability and maintainability, and launched core applications to the Google Play Store and App Store.

Android Kotlin XML iOS Swift UIKit IPTV Apps Crypto Wallets

Education

Degrees, certifications, and relevant coursework

Faculty of Technical Sciences, University of Novi Sad

Bachelor of Science in Software Engineering, Software Engineering

2020 - 2023

Grade: GPA: 8.9 / 10

Earned a Bachelor of Science in Software Engineering at the Faculty of Technical Sciences, University of Novi Sad (2020–2023), graduating with a GPA of 8.9/10.