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Full Stack Developer (7 Years) | Full-Time Freelancer I provide one-stop software solutions for startups and businesses. Instead of hiring separate frontend and backend developers, I build your entire product from the ground up—from server architecture to cross-platform clients. What I Deliver: - End-to-End Lifecycle: Architectural design - Backend/API - Pixel-perfect UI - Market Release. - Cross-Platform Expansion: Seamless apps for Android, iOS, Desktop, and Wear OS with high performance. - Scalable Backend Systems: Fast, reliable, and maintainable backend services powered by Rust and Axum for long-term product growth. - IoT & Hardware Expertise: Advanced integration for Android-based IoT clients, including Kiosk Mode, Serial Port communication, etc. - Fast Delivery: Skilled in leveraging AI agents to speed up development, reduce repetitive work, and quickly turn ideas into production-ready features. Core Tech Stack: - Frontend & Mobile: Kotlin Multiplatform, Compose Multiplatform - Backend: Axum (Rust), Ktor (Kotlin), Supabase I turn sketches into flawless, scalable apps. As a full-time freelancer, I guarantee fast, transparent communication and dedicated availability. Let’s build something great together.

I am a Unity Game Developer with 7 years of professional Unity development experience, I specialize in building mobile games, multiplayer systems, AR experiences, and 2D/3D games that go beyond the editor, and into the hands of real players. My portfolio includes 4 live published titles on Steam and Google Play Store, delivered end-to-end, from initial architecture to final store submission. I have built games from scratch, stepped into half-finished projects other developers abandoned, and shipped live updates without breaking what was already working. My expertise covers Photon Fusion, Unity Netcode, Mirror, AR Foundation, Firebase, PlayFab, URP, HDRP, and the full Unity toolchain. I plan architecture before writing a single line of code, test under real player conditions, and communicate proactively, no surprises at the deadline. STRENGTHS: ✔ 7+ years of dedicated Unity development across mobile, multiplayer, AR, 2D and 3D ✔ 4 live published games on Steam and Google Play Store, not demos, real products with real players ✔ Full-cycle delivery, concept, architecture, development, publishing, and post-launch support ✔ Multiplayer specialist, systems built and debugged under real player conditions, not just local testing ✔ Project rescue expert, I take over broken or abandoned Unity projects and deliver them ✔ Performance-first approach, optimized for real-world devices, not just high-end test machines ✔ Honest scoping, if something isn't feasible in your timeline or budget, I tell you before starting, not at delivery ✔ Proactive communication, you hear about any issue from me before the deadline, never after SERVICES 📱 Mobile Game Development - Android & iOS End-to-end mobile game development from concept to store launch. Every build is optimized for real-world devices across performance tiers. A visually stunning game running at 40fps on a mid-range Android is a game players actually keep installed. 🕹️ Multiplayer & Networking Photon PUN2, Photon Fusion, Unity Netcode, Mirror, Nakama. Not just integrated, but stress-tested under real player conditions. I've debugged sync issues that only appear at scale, lag spikes that never show in local testing, and master client bugs that break room state in edge cases. This is work I know inside out. 🕶️ AR Game Development AR Foundation, ARCore, ARKit. Interactive augmented reality experiences built for both Android and iOS. Location-based features, image tracking, surface detection, and gameplay mechanics designed to feel natural in the physical world. 🎮 2D & 3D Game Design Complete game design and development across both pipelines. Level design, gameplay mechanics, game architecture, UI/UX, and player progression systems built to retain players beyond the first session. ⚙️ Backend & Live Ops Firebase, PlayFab, Supabase. Player authentication, cloud saves, leaderboards, remote config, analytics, and crash reporting. Everything your game needs to stay alive, scalable, and operational after launch day. 💰 Monetization Integration AdMob, LevelPlay, Unity Ads, In-App Purchases. Integrated and running on live, revenue-generating products. Not just configured and shipped. Actually earning. 🔧 Project Rescue & Optimization Broken multiplayer sync. Abandoned codebases. Performance issues killing retention on mid-range devices. I diagnose, prioritize, and fix without unnecessary rebuilds. If it can be saved, I'll save it. 🖥️ Multi-Platform Publishing Android, iOS, Steam, WebGL, Meta Quest. Full publishing support included. Store setup, app signing, ASO, release management, and post-launch patch support. TECHNOLOGIES Engine & Language - Unity 3D, Unity 2D, C# Multiplayer / Networking - Photon PUN2, Photon Fusion, Unity Netcode, Mirror, Nakama AR / VR / XR - AR Foundation, ARCore, ARKit, Meta Quest, Unity XR Toolkit Backend & Live Ops - Firebase, PlayFab, Supabase Monetization - AdMob, LevelPlay (IronSource), Unity Ads, IAP Graphics & Rendering - URP, HDRP, Shader Graph, VFX Graph, Spine 2D, Particle Systems Platforms - Android, iOS, Steam (PC/Mac), WebGL, Meta Quest Architecture - Object Pooling, MVC/MVP Patterns, Modular Design, ScriptableObjects TOOLS 🛠 Development - Unity Editor, Visual Studio, JetBrains Rider 🛠 Version Control - Git, GitHub, Plastic SCM 🛠 Publishing - Steamworks SDK, Google Play Console, App Store Connect, Meta Developer Hub 🛠 Project Management - Jira, Trello, Notion 🛠 Design & Assets - Figma, Adobe Photoshop 🛠 Analytics & Monitoring - Firebase Console, PlayFab Dashboard, Unity Analytics If you're building a mobile game, launching a multiplayer experience, developing an AR product, or rescuing a Unity project that a previous developer left behind, I'm the developer you're looking for. 📩 Send me a message. Tell me about your game. Let's build something worth downloading.

I’m a Software/AI & VPS Engineer, I can fix anything with zero mistakes n build everythings easily n fastest, i got unlimited Codex token, love to do things OpenClaw, Blockchain, Pipeline, flutter, flutterflow, build tools, Internal tools, Modules, Bot, Mod, sys Linux n i can copy any site 100% match quick n easy n i strong in backend and full-stack systems and build Web apps, Mobile Apps, Desktop Apps, Rust/Tauri, Electron, Browser Extension n trading system, n strong Web3 edge (EVM, Stellar & Solana). I turn ambiguous ideas into secure, reliable, human-centered products using TypeScript/JavaScript, React/Next.js, Node.js/Nest, Go, Python, Solidity, Rust (Anchor), and modern infra. I care about clean architecture, measurable impact, and great developer experience (DX) also so features ship fast and safe, also love building an Apps & AI things. for the security side, I bring pentest/audit mindset to every build: threat modeling, fuzzing & invariants, automated checks in CI, and clear, actionable reports. I also provide English technical translation/localization for whitepapers, docs, and UI strings. Languages: TypeScript/JavaScript, Vue, Go, Python, Solidity, Rust (Anchor), Php, Ruby, C & C++ Frontend: React, Next.js, Tailwind, Radix/shadcn, Vite, SSR/SSG/ISR, Flutter Backend: Node.js (Nest/Express/Fastify), Go (Gin/Fiber), GraphQL, REST, gRPC, WebSockets Web3: Solidity, Rust/Anchor, Hardhat, Foundry, OpenZeppelin, viem/wagmi, ethers.js, WalletConnect v2, Safe, The Graph, IPFS Testing: Jest/Vitest, Playwright, Supertest, Foundry (fuzz/invariants), Slither, Echidna Data: PostgreSQL, MySQL, SQLite, Prisma/TypeORM/Knex, Redis DevOps: Docker, GitHub Actions, basic K8s, AWS/GCP basics, Sentry, OpenTelemetry, Tenderly, OpenZeppelin Defender Security: OWASP ASVS/API, RBAC/ABAC, token design, key/secret rotation, rate limiting & anomaly detection, audit reports DeFi staking: with upgradeable proxies storage-safe upgrades, 0 criticals in audit NFT marketplace royalty splits, subgraph indexing, gas-optimized listings Solana program PDA-secured escrow with CPI, wallet-adapter UX, >95% test coverage Payments & off-chain settlement Webhooks + queues, idempotent APIs, chargeback handling Security engagement BOLA/IDOR class bugs identified; implemented header-precedence fixes & authZ binding

Hi there! I’m a passionate developer with extensive hands-on experience delivering end-to-end software and hardware solutions. Whether you need a blazing-fast web app, a rock-solid backend API, or a custom FPGA/Qt application, I’ve got you covered. On the frontend, I work confidently with Vue, React, Electron and Tauri to build responsive, dynamic user interfaces. On the backend, I develop scalable systems using Rust, Go, Java, Python, Node.js, and C/C++ — choosing the right tool for performance, reliability, and maintainability. I also specialize in mobile app development, creating high-quality cross-platform UIs with React Native and Flutter as well as native Android (Kotlin/Jetpack Compose) and iOS (Swift/SwiftUI) applications. Let’s build something great together.

I help companies build latency-sensitive audio systems and performance-critical native applications for embedded, desktop, and mobile platforms. My core expertise is turning complex low-level requirements into reliable and scalable architectures and implementations. Project Highlights: 1. Roc Streaming — co-founded and maintain an open-source real-time audio streaming ecosystem. 2. ViveSound audio engine — co-founded ViveSound and implemented commercial engine for OS-level audio processing injection. 3. Internet audio streaming — built a streaming daemon for embedded Linux with guaranteed 40 ms Internet latency, forward error correction and packet loss concealment. 4. Airborne audio synchronization — built acoustic-signature-based synchronization, aligning network playback to over-the-air audio within 1-2 ms. 5. Distributed playback sync — built multi-receiver network playback synchronization with sub-millisecond precision over high-jitter Internet connection.

Hello! My name is Aleksandr Kalinin. I have a double major in Math and CS. I have been programming professionally since 2006. Skills: C++ 11/14/17/20/23, STL, SIMD (SSE, AVX, AVX512), CMake, vcpkg, Conan, Boost, perf, VTune. Python, Data Science, NumPy, Pandas, Matplotlib. Rust, tokio. Algorithms, Data Structures, Computational Geometry, Optimization, Linear Algebra, Numerical Methods. Concurrent Programming, Multithreading, Lock-free Programming. CUDA, HIP, OpenCL, Compute Shaders, Halide, TBB, OneAPI. Graphics Programming, Vulkan, Metal, DirectX 12, OpenGL, HLSL, GLSL, MSL, Slang, Real-time Rendering, Custom Engine Development. Unreal Engine 4/5, Godot, Cocos2dx Machine Learning, Deep Learning, PyTorch, TensorFlow, Scikit-Learn, ONNX, TensorRT. Computer Vision, Image Processing, OpenCV, Roboflow, Triton, YOLO, YOLOv11, DETR, RT-DETR, Faster R-CNN, R-CNN, U-Net, DeepLabV3+, SAM, SAM2, SegFormer, ResNet, ConvNeXt, ViT, Swin. Optimization / Solvers: OR-Tools (CP-SAT), Z3, MiniSAT, SCIP, HiGHS, IPOPT, MiniZinc. Point Cloud Processing, Collision Detection, Physics Simulation. Maya API, Houdini API (HDK, VEX, HScript), Blender Python API, Pipeline Tools Development. Software Porting, Game Development. Qt, QML, PySide6, WxWidgets, VTK. iOS Development, Swift, Objective-C, UIKit, AVFoundation, Metal. Android Development, NDK. FFmpeg WebRTC, RTMP, RTSP, SRT, HLS, NDI, MPEG-DASH, CMAF, WebTransport, QUIC, UDP/RTP/RTCP, TCP, WebSockets, HTTP Live Streaming pipelines, Video Processing, Real-time Streaming Systems. JavaScript, Node.js, Three.js, Pixi.js. Docker, Kubernetes, AWS, EKS, CI/CD, n8n. PostgreSQL, Supabase. Windows, Mac, Linux. AI, Claude Code.