Особисті дані приховані

Volodymyr Martyniuk
Senior iOS Developer · AI-assisted engineering, agents & generative media
[відкрити контакти](див. вище в блоці «контактна інформація») | telegram: @DkTitaH | LinkedIn: [відкрити контакти](див. вище в блоці «контактна інформація»)

PROFESSIONAL SUMMARY
Senior iOS Developer with 8+ years of hands-on experience building high-performance, production-grade mobile
applications across fintech, betting, ride-hailing, social networking, e-commerce and consumer subscription apps.
Deep expertise in Swift, UIKit, SwiftUI, reactive programming (RxSwift/Combine) and modern architecture
patterns (MVVM, TCA). Proven track record of growing from Middle to Senior, leading features from ideation to
App Store release, building apps from scratch and delivering maintainable codebases at scale. Hands-on
experience with digital signatures (EDS/PKI), video calling (Jitsi Meet SDK, WebRTC), complex fintech flows
(credits, deposits, KYC), native StoreKit subscriptions and ad attribution (MMP SDK) for paid user acquisition.
Since 2025 — working AI-first: long-lived Claude Code agents per project, custom MCP servers, multi-agent
collaboration between iOS and backend, and generative media pipelines (ComfyUI, SDXL, LoRA training, Wan
image-to-video). Ships independent iOS apps end-to-end under own developer account (App Store Small Business
Program).

TECHNICAL SKILLS
Languages & Swift (Expert), Objective-C (working knowledge), Python, C#, GDScript; iOS 12–26, macOS
Platforms
Architecture MVVM, MVC, TCA (The Composable Architecture), Clean Architecture, Coordinator pattern,
Service Layer, DI
Reactive RxSwift, Combine, async/await (Swift Concurrency)
Programming
AI-Assisted Claude Code (long-lived project agents, skills, hooks), Model Context Protocol (MCP) —
Development custom MCP servers/tools, agentic workflows, spec-driven multi-agent collaboration,
prompt engineering, Codex / local LLMs (llama.cpp)
Generative AI & ComfyUI pipelines, SDXL (RealVisXL Lightning), FLUX, InstantID, identity LoRA training,
Media Wan 2.1/2.2 image-to-video, consistency metrics, safety/age gating, RunPod GPU cloud
On-device ML Core ML (inpainting / photo retouching), Vision, on-device STT/TTS, local inference
(llama.cpp, Vulkan/Metal)
Networking REST API, WebSockets, TCP/UDP, WebRTC, HTTP/HTTPS, Alamofire, URLSession
Security & Crypto Digital Signatures / EDS (PKI, CMS), Keychain, Biometric Auth (Face ID / Touch ID), SSL
Pinning
Video & Jitsi Meet SDK, WebRTC, BlueSocket, AVFoundation, CallKit
Communication
Monetization & StoreKit 2 (subscriptions, IAP), App Store Small Business Program, MMP SDK ad attribution
Growth (TikTok / Meta campaigns), ASO, App Store review & compliance
Databases & Storage CoreData, Realm, UserDefaults, Keychain
UI Frameworks UIKit (expert), SwiftUI, SnapKit, AutoLayout, Custom Animations, MessageKit
Maps & Location Google Maps API, MapKit, CoreLocation
Game Development Godot 4 (GDScript), 2D gameplay systems, pass-and-play & arcade mechanics
Third-party Firebase (Crashlytics, Analytics, Push), Facebook SDK, Kingfisher, SDWebImage,
Integrations IQKeyboardManager
Dev Tools & CI Xcode, Git/GitHub, CocoaPods, SPM, Fastlane, TestFlight, Charles Proxy
Methodologies Agile/Scrum, Code Review, TDD basics, SOLID principles, spec-first development with AI
agents

WORK EXPERIENCE
Senior iOS Developer (Contract)
Independent contractor | 2025 – Present | Remote
Domains: Consumer Subscriptions · Astrology / Tarot / Numerology · Paid User Acquisition
• Sole iOS developer on a consumer subscription app for the Polish, Spanish and Italian markets; brought it from
active development to App Store launch (October 2026).
• Implemented native StoreKit 2 subscriptions and paywalls without third-party wrappers; handled App Store
review, compliance and localization for three markets.
• Integrated an MMP SDK for ad attribution and in-app event tracking powering the media-buying team's TikTok
and Meta campaigns; aligned events with marketing KPIs.
• Set up an AI-assisted workflow: a long-lived Claude Code agent for the app and a custom MCP channel server
linking it with the backend developer's agent through a shared GitHub specs repo (labels needs-ios /

needs-backend) — specs, API contracts and acceptance notes exchanged automatically instead of over chat.
• Collaborated with the backend developer on REST API design and release coordination; owned the iOS side of
launch fixes end-to-end.

Middle iOS Developer → Senior iOS Developer
Finik Pro | 2023 – 2025 | Remote
Domains: Fintech · Digital Banking · Video Communication · e-Signature
• Built a full-featured digital banking app from scratch: architected the project structure, set up CI/CD pipeline,
and delivered MVP within deadline.
• Developed core fintech modules: credit application flows, deposit management, transaction history, account
dashboard — using SwiftUI + TCA.
• Integrated digital signature (EDS/PKI) support for legally binding in-app document signing: CMS signature
generation, certificate validation, secure key storage via Keychain.
• Implemented video calling with Jitsi Meet SDK (CallKit integration, background audio, PiP mode) so customers
can consult bank managers in-app.
• Built hybrid UI: SwiftUI screens with TCA state management alongside UIKit legacy flows; ensured smooth
interoperability.
• Grew from Middle to Senior: took ownership of architectural decisions, introduced code review processes, and
onboarded new team members.
• Delivered multiple features end-to-end: requirements with product, implementation, unit tests, App Store
shipping.
• Optimized app startup time and memory footprint; resolved critical crashes identified via Firebase Crashlytics.
iOS Developer
Startup (Confidential) | April 2020 – 2023 | Remote
Domains: Social Networking · Ride-Hailing · E-Commerce · Betting
• Led end-to-end feature development for a real-time ride-hailing app: driver/passenger tracking, dynamic ETA
via Google Maps SDK and CoreLocation.
• Architected a social networking module with real-time chat (WebRTC + BlueSocket), media sharing
(AVFoundation, Kingfisher), push notifications (Firebase FCM).
• Built scalable e-commerce flows: product catalog, cart, in-app purchases, third-party payment gateways.
• Developed real-time sports data feeds and betting slip management in a high-traffic betting module; optimized
UI rendering for live odds via WebSocket.
• Refactored legacy MVC codebase to MVVM + Coordinator, reducing complexity by ~30% and improving
testability.
• Integrated Facebook SDK for social login and analytics; Firebase Crashlytics reduced crash rate by 40%.
• Performed code reviews, maintained coding standards, mentored 2 junior iOS developers; collaborated with
backend on REST API contracts and versioning.
iOS / macOS Developer
IDAP | October 2018 – April 2020 | On-site
Domains: Fintech · Enterprise · Internal Tools
• Developed iOS and macOS applications for enterprise clients: custom dashboards, secure networking, data
visualization tools.
• Implemented fintech features: secure transaction flows, biometric authentication (Face ID / Touch ID),
encrypted local storage via Keychain.
• Built a networking layer from scratch supporting REST, UDP/TCP sockets and WebRTC video calling;
concurrency with GCD and Operation Queues.
• Designed reusable UI components with UIKit and SnapKit, reducing UI development time by ~25%; applied
RxSwift across data binding and validation.
• Maintained CocoaPods dependency management; migrated one project to Swift Package Manager. Delivered a
freelance iOS project in parallel, wireframes to App Store.

AI, AGENTS & GENERATIVE MEDIA (2025 – 2026)
• Consistent AI-character pipeline (client project, 2026): ComfyUI pipeline producing identity-consistent
synthetic characters for photo and video. Trained an identity LoRA on RunPod (RTX 4090); production path
SDXL Lightning + InstantID + face-refine pass, Wan 2.1 image-to-video clips. Delivered 8-shot set with
measured identity consistency ≥ 0.68, Wan 2.2 clip and a client report. Built a character-constructor web GUI
(traits, wardrobe, archetypes), automated safety/age gate, LoRA and prompt management tooling; evaluated
FLUX/LTX/Wan 2.2 and cut them on quality-vs-cost.
• Agent Bridge: self-hosted MCP channel server that connects two long-lived Claude Code agents (iOS and
backend) through a shared GitHub specs repository — polls issues/labels via gh, routes specs and acts between
agents, keeps both teams' context in sync without manual hand-offs.

• Voice Secretary (in progress, open source planned): earbud voice assistant → hub on a home PC that
relays commands and answers to per-project AI agent sessions. Agent-agnostic (Claude Code, Codex, local
models); on-device STT/TTS so only text leaves the phone.
• ClearShot (in development): privacy-first iOS photo retouching app with fully on-device Core ML inpainting
(no cloud); one-time purchase, go-to-market via ASO.
• Local AI infrastructure: headless LLM server on a home PC (llama.cpp, Vulkan backend) + Mac for Metal
image generation; RunPod cloud for GPU-heavy training; designed a production stack for a 1000+ user
companion service (dedicated + on-demand GPU, LLMs with memory).

KEY PROJECTS
• Finik Pro — Digital Banking App (from scratch): SwiftUI + TCA, EDS/PKI digital signatures (CMS, Keychain),
Jitsi Meet SDK video calls, credits & deposits flows, hybrid UIKit+SwiftUI, App Store release.
• Consumer subscription app (astrology / tarot / numerology, PL/ES/IT): native StoreKit 2, MMP SDK ad
attribution for TikTok / Meta UA, App Store launch 2026 — see Work Experience.
• Independent iOS apps (own developer account, App Store Small Business Program): Bigger Half: Cut
It Even — arcade game, released on the App Store; in development: Cake Claim (retro arcade), Mahjong, Iriy
Browser (ad- and gambling-blocking browser) — full cycle: concept, build, review, ASO.
• Godot games: PROTOCOL // ANNEXION (sci-fi RTS) and a dark witcher-style monster-detective game set in
X–XI c. Rus — gameplay systems, narrative tooling, lore video content.
• Ride-Hailing App (Uber/Bolt-like): real-time GPS tracking, driver/passenger matching, dynamic pricing,
Google Maps routing, background CoreLocation, MVVM + Coordinator.
• Social Messenger with Video Calls: chat (MessageKit), WebRTC video/voice, BlueSocket, Firebase push,
media gallery (AVFoundation), 50K+ MAU.
• Fintech Dashboard (iOS + macOS): secure transaction management, Touch ID / Face ID auth, REST +
encrypted CoreData, custom charts, enterprise deployment.
• Sports Betting Platform: live odds via WebSocket, bet slip management, RxSwift reactive UI, deep-link
navigation, App Clips.
• E-Commerce App: product catalog with offline support (Realm), StoreKit IAP, Stripe, push promo campaigns,
A/B feature flags.

EDUCATION
Master's Degree — Computer Systems and Networks
Kryvyi Rih National University (KNU) | Graduated 2018

LANGUAGES
Ukrainian / Russian: Native · English: Pre-Intermediate (technical documentation, written communication)