I'm Ivan Oparin. A Senior iOS Developer and technical lead with a passion for building robust, modern iOS (macOS, watchOS, tvOS, visionOS) applications and exploring innovative product experiences. My background spans large-scale e-commerce, healthtech, fintech, ed-tech, food-tech and advanced UTXO blockchain R&D.
- 📍 Digital nomad, currently hop between Georgia and Armenia
- 📧 treetop-margins-5c@icloud.com | LinkedIn
- 🎓 Education: BSc in Informatics and Computer Engineering, MSTUCA; Business Informatics coursework (7 semesters), RANEPA
- 🧩 Core Open Source Contributions: Swift Relux architectural library and ecosystem co-author and core maintainer
- Wildberries — Senior iOS Developer, contributing to the iOS app for the largest online retailer in the CIS.
- Unitea Inc — iOS Tech Lead, delivered a modern SwiftUI/UDF app and advanced AR integrations.
- SKL.vc — Senior iOS Developer. Shipped EasyGrocer (iOS), Artific (iOS), and Translaitor (macOS) apps.
- Darwell Inc — Senior iOS Developer, built camera-based health monitoring apps with SwiftUI & UDF.
- Kaller Communications — iOS Developer, focused on early exploration of high-performance SwiftUI + UDF library.
- Bitcoin Wallet — Blockchain Integration Architect, R&D on cryptographic protocols for privacy in Bitcoin wallets.
- Languages: Swift, Objective-C, Go, C, C++
- Frameworks: SwiftUI, UIKit, AVFoundation, FoundationModels, TensorFlow, CoreML
- Libraries: Swift Algorithms, Swift Collections, os.log
- Tools: Xcode, Xcodegen, Tuist, Xcode Cloud, Fastlane, Gitlab/Github Actions, Terminal, Console, Figma, Sketch
- Swift Relux: Core maintainer/contributor and co-author to a Flux/Redux-like library for SwiftUI (Unidirectional Data Flow).
- SUINavigation: UIKit-grade navigation to SwiftUI: custom configurable navigation bar, clean api, no NavigationStack bullshit.
- Wildberries: iOS development for the largest e-commerce platform in Russia and CIS. (2024–2025)
- Unitea: Large-scale, TikTok-like app for music fans in the USA. (2023–2024)
- EasyGrocer: Feature-rich grocery shopping app for the UAE market. (2025)
- Artific: AI character communications for fun and entertainment. (2024)
- Translaitor: Cross-platform real-time language interpreter app. (2024)
- FlowVit: Remote rPPG health monitoring for B2B health insurance companies. (2021–2022)
- Darwell: Personal well-being assessment and coaching app (iOS). (2022–2023)
- BreatheWell: Customizable breathwork and HRV monitoring (iOS). (2022–2023)
- Squallenge: Automatic squat recognition and fitness tracking (iOS). (2022–2023)
- Bitcoin/Ethereum wallet: Early adopter of Swift for secure blockchain apps. (2017–2018)
- Turn And Learn: Pioneer in iOS ed-tech (2011–2013).
- Logbook: Keeps a persistent
LOGBOOK.mdas high-signal institutional memory (findings, decisions, root causes, regressions). - telegram-telethon: Local Telegram skill and CLI for macOS Keychain-backed profile management, folder discovery, and structured chat export with Telethon.
- skill-glab-mr-workflow: GitLab merge request workflow skill for Codex and Claude Code with Keychain-backed
glabauth, MR status reads, pipeline failure summaries, reviews, manual jobs, and safe create/approve/merge flows. - skill-youtrack: YouTrack workflow skill for Codex and Claude Code with Keychain-backed auth, named instances, scoped boards, current sprint tasks, issue reads, comments, field updates, and explicit board or sprint membership flows.
- skill-codex-list-sessions: Codex and Claude Code skill for listing recent local Codex sessions with full session IDs, overall discussion summaries, exact trailing user messages, topic search, and exact session lookup.
- skill-debug-codex-requests: Codex skill for capturing real outgoing provider requests through a local OpenAI-compatible proxy, inspecting
system_promptand tool injection, and benchmarking TTFT, warm throughput, and near-context behavior.
- go-ai-agent: (WIP) Minimal Go agent runtime — ReAct loop, pluggable tools, single binary.
- cocoaskill: (WIP) Dependency manager for AI agent skills. Declarative, reproducible, secure.
📝 Blog posts and dev notes:
- Synchronizing Two macOS Machines with Nix, nix-darwin, and Home Manager
- SSH + VNC Key-Only Access on macOS (Tunnel)
- SSH + GitHub Agent-Forwarding Tech Note
- macOS Firewall Enablement Tech Note
- Tailscale Exit Node + Team VPN Forwarding (Failed)
- Local Setup Guide for OpenAI gpt-oss Models with Codex CLI, Ollama, LM Studio, and MLX on Apple Silicon
- Launching Codex with full network and sandbox access
- SwiftUI Transition Removal Bug
- Swift Threading & Concurrency
- Capturing Full Staged Changes with Git
- Using Git Worktree for Parallel Branch Development
- Manually Download & Install Xcode Simulator Runtimes
- Override macOS Metal “VRAM” Cap on Apple Silicon for Local LLMs
- Innovative Bitcoin User-Experience With Billion Wallet for iPhone 2018-02-12
- How BIP47 Reusable Payment Codes enrich Bitcoin and overall cryptocurrency user-experience 2018-01-18
- What are the properties of a true Bitcoin wallet? 2018-04-06
- The First Thread — depicting the moment of divergence in perception of Bitcoin evolution 2018-04-18