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Denis Boliachkin

iOS Developer

I build user-facing HealthTech features with Swift and SwiftUI — complex data visualization, UX polish, and product ideas turned into reliable, maintainable code.

My background in processing wearable and health data helps me work confidently with data-driven product logic. I care about reusable code, pragmatic architecture, and performance.

I actively integrate AI coding tools and agents into my workflow — from exploring unfamiliar codebases to implementation, testing, debugging, and documentation.

Experience

iOS Developer · Welltory

Apr 2025 — Present · Remote
  • Build production HealthTech features with Swift, SwiftUI, and Swift Concurrency.
  • Develop data-driven features for activity, sleep, stress, health, and workouts.
  • Create reusable SwiftUI charts for complex health-data visualization.
  • Refactor large screens into modular, maintainable MVVM components.
  • Implement reliable async data flows and unit-tested logic for personalized insights.

Data Processing Systems Developer · Welltory

Dec 2022 — Apr 2025 · Remote
  • Developed Python and JavaScript algorithms that turned raw wearable data into health and wellness metrics.
  • Analyzed activity, sleep, heart rate, and HRV data.
  • Built calculation logic for sleep, stress, energy, and other wellness metrics.
  • Wrote JavaScript modules running on mobile devices and integrated them into the app with iOS engineers.

Skills

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