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I build production-ready LLM chatbots and high-speed APIs that move business metrics. 15+ years in Python/FastAPI and data platforms. Led AI and backend at venture-backed and 🏅Fortune-500 products. 🏆 Launched LLM chatbot at GeoDB → new revenue vertical; deployed image generator to boost engagement. 🏆 Cut infra costs 8k→1k €/mo and halved annual budget 180k→90k by smart architecture & consolidation. 🏆 Built ETL pipelines (PyArrow/DuckDB) turning reports from days→minutes; scaled engine 1GB→4TB. 🏆 Hyperice (F500): WebSocket + FastAPI backend for group sessions → +15% engagement and $2M in subs revenue impact. What I deliver: 📦 LLM Chatbots & RAG: ChatGPT/Claude integration, LangChain/LangGraph, retrieval, tools, evals, guardrails. 📦 FastAPI Backends: Low-latency REST/WebSocket services, auth/RBAC, queues, testing, observability. 📦 Data Pipelines/ETL: Airflow jobs, PyArrow/DuckDB, PostgreSQL/MongoDB, analytics-ready models. 📦 Cost & Scale: Docker/AWS, async IO, caching, perf tuning, pragmatic infra that pays for itself. 🛠️ Stacks & keywords: Python, FastAPI, LangChain/LangGraph, OpenAI/Anthropic, RAG, Vector DBs, WebSockets, PyArrow, DuckDB, Airflow, PostgreSQL, MongoDB, AWS, Docker. How we start (low-risk): 🟢 48-hour Diagnostic – clarify use-cases, data, and constraints; mini-POC or architecture plan. 🟢 Milestone Plan – delivery roadmap with success metrics (latency, CTR, retention, cost). 🟢 Build & Ship – iterative releases with tests, dashboards, and handover docs. Results I optimize for: faster CX, higher conversion/retention, lower infra cost, clear analytics. 👉 Ready to move from idea to impact? Invite me with 2–3 lines about your users and goal. I’ll propose a concrete plan and timeline.

I help founders turn ideas into high-quality iOS apps that scale, following industry-standards. ✅ 10+ years as a senior iOS engineer in Germany for companies like trivago, Ubisoft, and Deutsche Kreditbank (DKB). ✅ Skilled in Swift, SwiftUI, OpenAI integration, Supabase, Analytics, Subscriptions & In-App Purchases, GitHub, SwiftData, Unit Testing, MVVM+, and more. 🚀 POPULAR APPS I'VE WORKED ON: • trivago • Porsche Card (German App Store) • Miles & More Credit Card by Lufthansa (German App Store) • Hilton Honors Credit Card by Hilton (German App Store) • Assassin's Creed: Identity 💼 WHAT YOU GET WORKING WITH ME: • Proactive, reliable, and easy to collaborate with. • High-quality, maintainable, and scalable code built right from day one. • Pixel-perfect UI with attention to detail and performance. • Deep understanding of Apple’s App Review & Distribution Guidelines. 👩🏻‍💻 SERVICES I OFFER: • Consultation: Technical feedback or architecture review. • MVP Development: Build a native iOS MVP from scratch. • Feature Implementation: Add new features or improvements to your existing app. • Feature Updates: Maintenance, refactors, or upgrades. Plus more… 🛠️ CURRENT TECH STACK INCLUDES, BUT IS NOT LIMITED TO: Languages: Swift UI Framework: SwiftUI AI Integration: OpenAI Source Control: GitHub Subscriptions: RevenueCat Analytics: Google Analytics Local Storage: SwiftData (iOS 17+) Backend: Supabase, REST APIs Architecture: MVVM + modern state management (iOS 17+) Testing: XCTest 💬 Let’s build your app right from day one. Message me to discuss how I can bring value to your business.

🚀 iOS Developer | 6+ Yrs | Built for Scale, Designed for Users 🎯 Swift • Objective-C • Clean Architecture • UX-Obsessed I don’t just build apps — I craft mobile experiences that perform, scale, and convert. With over 5 years of hands-on iOS development experience and 2 years at a fast-paced social media company, I know what it takes to ship apps that stand out in crowded markets. Former mid-senior iOS developer at Data Wow, I’ve led feature-rich app launches from scratch, optimized legacy codebases, and collaborated cross-functionally to deliver seamless, high-impact mobile products. What You Get: ✅ Clean, maintainable code (Swift / Objective-C) ✅ Deep focus on UX & performance ✅ End-to-end delivery (from prototyping to App Store) ✅ Fast, clear communication with zero guesswork I'm now looking for full-time roles (remote/hybrid) where I can grow, build meaningful products, and contribute to companies that value excellence. Open to relocation for the right opportunity. My personal goal? Level up professionally while easing the financial weight off my family.

I graduated from one of the strongest technical universities in the country with a perfect A grade in Automation of Technological Processes and Production. I try to be on forefront of iOS development. Every day I learn something new, read every article on NSHipster.com, something from Medium.com, Kodeco.com and other sites, watch WWDC videos. Currently I work in the team of iOS Developers as Team Lead. I’m teach them a new and interesting techniques in development and try to instill my love for high quality code, right architecture, simple useful UI/UX design and high performance to the team. My love for programming starts in 1996 when I saw first programming tools at the school. In 2008 I bought my first iPhone and understood that I should be a programmer: I want to be a part of this great thing. I did some apps just for fan and learned Obj C language. In 2010 I got a job in an outsourcing company and has continued to study there. Swift is my second deeply loved dev language since 2.1 Thanks to AI that helps me to develop apps faster and have another opinion 🙏 As a developer I love deeply thought architecture, clean, well-structured and agile code. I love Apple simple and beauty design and want to work with best designers and UX engineers. I think that great team should do code reviews and seminars to share knowledge. Development is my passion 🤖 ✔︎ Core ML ✔︎ Augmented Reality ✔︎ SwiftUI ✔︎ Objective C ✔︎ Metal ✔︎ Core Audio ✔︎ App Clips Research work within the specialization: Automation of Technological Processes and Production in Mechanical Engineering "Universal interface for obtaining any objects in the form of an expert system." Teacher of the iOS course: Developer from scratch (IT Academy) Open lessons: Creating programs for business (Movavi school) Lectures: I automated your API! MobiFest Universal interface for obtaining any objects. Lamp CoffeeCode 📙 Design patterns 📘 Clean code 📒 Perfect code 📓 Clean architecture 📔 TRIZ 📗 The Inmates Are Running the Asylum 📕 Deadline etc. * Linked List in production * Temporary Reference Cycle with benefit Feel free to ask about anything Xcode 3.1+ iOS 1.1.3+ macOS 10.3+ watchOS 1.0+ tvOS 9.0+ visionOS 1.0+

Background: 9+ years experience as an iOS developer 80+ works completed on Upwork 5000+ man-hours worked Team Lead, Product Owner, CTO - practical skills Area of expertise: - image and video processing apps (filters, transitions, templates, collages, patterns, audio, stickers, etc.); - audio processing apps (audio effects, sampling, generators, MIDI, OSC, etc.); - client-server apps (networking, serialization, caching, etc.). Stack: iOS, Xcode, Swift, Objective-C, UIKit, NSFoundation, AVFoundation, CoreText, OpenGL ES, GLSL, Metal, StoreKit, JSON, XML, CoreGraphics, CoreData, CoreVideo, CoreMedia, CoreAudio, CoreLocation, iCloud, Bash/sh, Git, Fastlane, Jira, Trello, Bitbucket, Github, In-app purchases, App Store. Ample knowledge of: - UI/UX design and development processes; - complex and large scale projects implementation; - support, updates and guarantee; - quality assurance and testing; - SDKs and APIs; - third-party integrations; - AppStore release process.

Hi! I'm Dmitry — a web and mobile developer with a passion for building clean, useful, and fast digital tools. Over the past year, I’ve worked as an iOS developer and published a real app to the App Store. I’ve also created web-based tools and internal systems using React, Tailwind, and JavaScript — from scratch or improving existing apps. I’m focused on: - React-based web apps and UIs - iOS apps using SwiftUI - Telegram bots and automation tools - API integrations and scripts I enjoy solving problems, writing clean code, and delivering value quickly. Always open to collaboration — let’s make something cool together.