Ertuğrul Bülbül

Published: Stems Lab – AI Vocal Remover - Built and launched an audio-processing mobile app that separates songs into individual stems using a custom server-side audio processing API developed by me. - Developed the mobile application with Flutter and implemented the entire backend audio processing and delivery pipeline. - Led the product end-to-end as an indie developer, owning architecture, audio processing logic, backend, integration, and release preparation. - Owned the design process direction while collaborating with external support for UI execution. - Implemented subscription monetization using RevenueCat, including paywall and purchase flows. - Set up Remote Config–style experimentation and tracked user behavior via Google Analytics and PostHog. - Managed ASO, keyword research, and Apple Search Ads campaigns.

Magic Retake – Led the mobile development of Magic Retake, a spin-off of the Retake app that allowed users to be placed into other photos in an ultra-realistic way - Solely handled the cross-platform Flutter development from start to finish - Designed and implemented AI-based workflows for photo compositing - Analyzed user behavior to guide feature development and UX improvements - Collaborated closely with the Product Design team to create a polished and intuitive interface Retake – Contributed to the development and product management of Retake: AI Photo Edit App (20M+ downloads) - Supported the development of a cross-platform Flutter app where users can upload their photos to create an AI model and enhance their low-quality photos in a realistic way - Assisted in defining the product roadmap based on user data analysis - Contributed to ideating and implementing various features to improve overall UX in the app - Participated in conducting A/B tests to increase both profitability and engagement - Collaborated closely with the Product Design team to ensure optimal UI/UX Voi – Co-led the development of Voi: AI Avatar Portrait Maker (6M+ downloads) alongside two other Product Engineers, working without a dedicated Product Manager - Built a cross-platform Flutter app where users upload multiple photos to generate AI-created avatars - Performed competitor analysis to guide the addition of new features - Analyzed user data and created the product roadmap accordingly - Ideated and implemented various features to improve overall UX in the app - Conducted numerous A/B tests to increase both profitability and engagement - Collaborated closely with the Product Design team to ensure optimal UI/UX

Facedance – Co-led the development of Facedance: AI Photo Animator (50M+ downloads) alongside two other Product Engineers, working without a dedicated Product Manager - Built a cross-platform Flutter app where users can upload their photos to get lip-synced video outputs generated by backend services - Conducted app content additions and content discovery - Performed competitor analysis to guide the addition of new features - Analyzed user data and created the product map accordingly - Ideated and implemented various features to increase overall UX in the app - Conducted numerous A/B tests to increase both profitability and engagement - Worked closely with the Product Design team to find the best UI/UX for the app

Contributed to the development of the Cleanup app with new features and improvements. Key contributions included: - Researched AI- and ML-based solutions to optimize the similarity algorithm. - Enhanced the similarity algorithm for better accuracy. - Developed features for contact merging and detecting duplicate contacts.

Worked on the backend and iOS development of a pay-as-you-go car insurance project. The project was later discontinued.

Worked on the iOS implementation and server integrations for the Dots and Boxes game within the Sociable app. Also contributed by fixing bugs and improving overall stability.