→ Discovered a neglected revenue-critical feature that was losing the business millions monthly. Built the business case, got executive buy-in, and formed a dedicated team to own the turnaround.

→ Led development of Refer a Friend — another key revenue feature. Joined early, mentored a fellow engineer through the project, partnered closely with product, and shipped it.

→ Fixed a production-only bug that no one in the organization could reproduce. Dug through package dependencies, found dead code in Okta's React Native library, and convinced Okta to patch it upstream.

→ Drove platform stability for a B2C mobile app serving 7M+ of users — redesigned auth flow, reduced TTI, introduced E2E testing with Maestro.

→ Go-to person for cross-platform architecture decisions. Led training sessions to help web engineers transition to mobile. Wrote extensive technical documentation.

→ Active advocate for AI adoption — introduced Claude Code to the team and built internal tooling around it.

→ Led a 3-month contract to rebuild an NGO's website and build mobile apps for flood tracking.

→ Used Expo with the new Expo Router to ship iOS, Android, and Web from a single codebase.

→ Managed the full project lifecycle — planning, architecture, development, and delivery.

→ Joined as the most senior React Native engineer. Immediately identified structural issues in the codebase and got buy-in for gradual improvements.

→ Built a design system from scratch to unify the component library and speed up development for the team.

→ Coached teammates, improved CI/CD pipelines, and raised overall code quality.

→ Company ran out of runway after 6 months. Led architecture planning for a pivot project before the layoff.

→ Joined a struggling pre-launch app and fixed video playback performance. Shipped to App Store within 2 months.

→ Wore every hat — built features, set up analytics pipelines in Tableau, analyzed user behavior, advised CEO on talent retention.

→ Mentored a junior engineer while shipping features every few days. Highest intensity, highest output period of my career.

→ Founding mobile engineer. Built the patient-facing React Native app from scratch — architecture, development, App Store negotiations, everything.

→ Flew from Kyiv to San Francisco to observe real patients using our app. Discovered our 10-screen onboarding was so painful that treatment coordinators were filling it in for patients. Pushed back, simplified to 3 screens, and saw satisfaction increase from both patients and staff.

→ Worked across the stack when needed — contributed to Ruby on Rails backend and Go services to unblock mobile features.

→ Shipped under HIPAA compliance requirements. Learned healthcare software is a different beast.