Kostiantyn Volkov - Full-Stack iOS Developer

What I build

Clear engineering packages, not vague “full-stack”

I can own a mobile product end to end, or plug into a team where iOS, backend, automation and launch work need one practical owner.

01

iOS development

SwiftUI, UIKit, navigation, offline cache, widgets, app extensions, subscriptions and stable App Store-ready flows.

02

Python backend

FastAPI services, PostgreSQL, Redis, workers, auth, quotas, admin tools, healthchecks and production APIs.

03

iOS + Python products

One product loop: mobile UI, backend contracts, push notifications, payments, analytics and post-release iteration.

04

AI and content pipelines

OpenAI, Gemini, Whisper, OCR, metadata extraction, enrichment pipelines and content automation for real workflows.

05

Launch and monetization

RevenueCat, StoreKit, paywalls, free-tier limits, Firebase, Amplitude, APNS and product funnel instrumentation.

06

Infrastructure and automation

Docker Compose, Nginx, background jobs, scheduled sync, Telegram admin alerts and maintainable deployment setup.

Profile

Product engineer who ships the whole loop

iOS product delivery

SwiftUI/UIKit apps from idea and architecture to App Store release, stability work and post-release support.

Backend depth

FastAPI, PostgreSQL, Redis, workers, auth, quotas, APNS, admin tooling and production deployment.

AI and content systems

OpenAI, Gemini, Whisper, OCR, metadata extraction and enrichment pipelines for real product workflows.

Experience

Commercial work

Sep 2025 - Present

iOS Developer

Midnight.Works / Remote

Shipping production SwiftUI features under NDA with a focus on clean modular architecture, deep navigation flows, API integration, caching, pagination and product analytics.

Jan 2024 - Sep 2025

Middle-Senior iOS / Full-Stack Developer

Polorix / Remote

Owned end-to-end product delivery across iOS, backend integration, testing, deployment and support. Built SwiftUI apps, FastAPI services, AI/content pipelines, recommendations, reviews, translations and admin notifications.

Feb 2022 - Sep 2024

Freelance iOS Developer

Self-employed / Remote

Delivered apps with onboarding, authentication, subscriptions, push notifications, offline caching, analytics, widgets, keyboards, reports and App Store releases.

Selected projects

Products and systems

Klad

Save, organize and plan

SwiftUI app with offline cache, REST APIs, RevenueCat, analytics, APNS, recommendations, reviews, ratings, collections, quotas and admin tooling.

Polorix Platform

Content and metadata backend

FastAPI pipeline for ingestion, AI enrichment, OCR, video/audio/image processing, scheduled sync and provider integrations.

Nexyra

Wi-Fi and LAN diagnostics

Network utility with diagnostics, device discovery, port scan, reports, Quality Score, RevenueCat subscriptions and Amplitude analytics.

Aura Widgets

Photo widgets and trackers

iOS 17+ widget builder using WidgetKit, AppIntents and App Groups with performance fixes for widget memory limits.

NureSchedule

Calendar and timetable

Custom SwiftUI week/month calendar, JSON schedule sync, MapKit routing and Look Around preview flows.

Superboard

Custom AI keyboard

KeyboardKit-based keyboard with voice input, quick replies, REST AI integration, App Groups and reduced input latency.

Skills

Stack that covers product, backend and launch

SwiftSwiftUIUIKitCore DataStoreKit RevenueCatFastAPISQLAlchemyPostgreSQLRedis DockerOpenAI APIGemini APIWhisperPyTorch FirebaseAmplitudeAPNSWidgetKitAppIntents