Sergei Z.

Most mobile apps fail because nobody thinks about what happens after launch. I've built apps that broke into the App Store Top 50, generated real revenue for clients, and I run my own subscription apps with 10K+ active users. I know what moves MRR and what doesn't. When you work with me, you're not just getting a mobile developer. You're getting someone who has personally: - Designed paywalls and onboarding flows that convert (not just "look nice") - Run paid acquisition (Meta, TikTok, Apple Search Ads) for subscription apps - Optimized for retention, churn, and LTV - the metrics that actually decide if your app survives - Built the ASO and organic growth side (keywords, screenshots, A/B tests) - Provided ongoing technical support so the product keeps improving post-launch If you're building a subscription app and want it to sell itself not just ship and pray - let's talk. I take on a small number of clients where I can be involved beyond the build: helping with monetization strategy, growth, and long-term technical health. Some of what I bring: - 10+ years building iOS and Android apps (10M+ combined downloads) - 200K+ MRR generated to clients - My own subscription apps with 10K+ users - Apple Pay / Google Pay / RevenueCat / subscription infrastructure - CI/CD, white-labeling, and the boring-but-critical engineering work - AI integrations (LLMs, on-device ML) where they actually improve the product Looking to launch, grow, or rescue a subscription app? Send me a message - happy to give you honest thoughts even if we don't end up working together.