I have more than 8 years of experience in web/mobile development. I've been working for a few years on Team Lead / Senior Software Developer positions in outsource-oriented company. I have really rich experience in creating projects from the scratch, inspired by idea, social environment and a will to make something great and useful. FRONT-END: Vue.JS, Vuex, Sass, Less, Babel, Bootstrap, CKEditor, Froala, React.JS, React Native, Ember.JS, Ember CLI, Ember Simple Auth, jQuery, Qunit, KnockoutJS, SocketIO, Webpack, Grunt, Gulp, Broccoli, Handlebars, Pug, WebSockets, Cordova, Phonegap, Electron, Yeoman, Hologram, Sassdoc, Bourbon, Neat, UIKit BACK-END: Node.JS (Express, Adonis) Firebase DATA STORES AND INDEXERS: MongoDB, MySQL, Postgis, PostgreSQL, Redis, sqLite OTHER TOOLS: Docker, Vagrant, Google Maps JS API, Google Maps Places API, Google Plus API, GMail API, MaxmindGeoIP, Mapbox GL JS, Memcached, reCAPTCHA, S3, Facebook API, Instagram API, Weather API, Blockchain API Due to non-disclosure agreements, I can't add every single project to portfolio section, so I'm absolutely ready for a detailed interview, if needed.

Hey, I’m Hasibul , a full-stack web and mobile app developer who loves building clean, fast, and reliable web apps that actually work — not just look good. Over the last 9+ years, I’ve helped businesses and startups bring their ideas to life — from small landing pages to large-scale platforms like Expensify and other SaaS projects with thousands of users. My goal is always the same: make your product stable, scalable, and smooth to use. 🔧 What I work with: React • Next.js • Node.js • Android • iOS • React Native •MySQL • MongoDB • REST & GraphQL APIs • AWS 💡 What you can expect from me: Clear communication and regular updates Clean, maintainable, and documented code Honest feedback — I care about getting your project right A long-term partner who treats your business like my own Whether you need someone to build from scratch or fix and optimize an existing system, I’m here to help. Let’s turn your idea into something powerful and production-ready 🚀

For the last decade I’ve worked as a Senior Mobile and Full Stack Software Engineer in Silicon Valley. Some notable experience is my work for Apple on the iOS Photos app, and my work for Coinbase on their self custody Wallet app. From small startups to fortune 500 companies, brand new projects to apps with hundreds of millions of users, I’ve worked with all kinds of teams and software. While mobile app development is my strongest skill, I have lots of experience in full stack environments with a myriad of technologies and platforms. I also have quite a bit of experience with UI/UX, 3D Modeling, and even some firmware development. And while I do have many skills, I will be upfront about any technologies in which I don’t have past experience. I work efficiently and independently and I strive to deliver a value that more than exceeds my cost to clients. I’m passionate about high quality software and I look forward to working with your team to deliver just that!

I am a versatile and driven tech professional with deep expertise in data engineering and a strong background in web and app development. With extensive experience across industries, I excel in transforming raw data into actionable insights and building innovative solutions that drive business success. Whether it’s leveraging PySpark for complex data transformations or designing responsive web applications, I am committed to delivering high-quality results and solving complex challenges. Key Skills: Data Engineering: ✅ PySpark & Hadoop ✅ Hive & SQL ✅ AWS & Cloud Technologies ✅ ETL Process Development ✅ Data Pipeline Optimization Web Development: ✅ Responsive Web Applications ✅ User-Friendly Interface Design ✅ Full-Stack Development (HTML, CSS, JS, React, Express, Node.js) App Development: ✅ Flutter & Firebase ✅ Cross-Platform Solutions ✅ API Integration Let’s connect to explore how I can help elevate your next data-driven or development project!

With a passion for building intelligent, beautiful apps with custom UIs, I use Flutter to help companies bring their next big product to life on any screen. My areas of expertise include: - Flutter specialist - Firebase specialist - Unit and widget testing - Customized chat apps with your personal AI Agent - App Monetization - Custom widgets and complex animations - MySQL / SQLite - MobX / Riverpod / BLOC state management - Git - Google, Facebook, Email, GitHub, Phone, and Apple authentications - Crashlytics, Google Analytics, AdMob, Push notifications - Lovable, Figma, Sketch, Adobe XD resource extraction Welcome! Let's have a chat :)

🚀 Senior Full-Stack Architect | AI & SaaS Expert (Node.js • Rails • Python • React • PHP) I help organizations focus on running and growing their business while I handle the technology that powers it. By taking ownership of their IT needs, infrastructure, and development challenges, I free teams from the complexity of managing technology so they can concentrate If you're launching a SaaS product, scaling under heavy traffic, modernizing a legacy system, or struggling to move an AI initiative beyond the prototype stage, I provide the technical leadership to stabilize, architect, and scale your platform with confidence. Over the past 16+ years, I've architected, scaled, and rescued mission-critical applications across Ruby on Rails, Node.js, Python, Laravel, and cloud-native environments—helping engineering teams reduce operational risk, improve system reliability, and accelerate feature velocity. 🏆 SELECTED EXPERIENCE ✔ Built and scaled enterprise SaaS platforms from MVP to millions of requests ✔ Designed high-throughput APIs and distributed architectures under heavy concurrent loads ✔ Delivered production AI automation, robust RAG systems, and intelligent workflows ✔ Modernized legacy codebases and systematically eliminated crippling technical debt ✔ Led multi-cloud migrations, DevOps automation, and infrastructure cost optimization ⚡ CORE EXPERTISE 🔹 SaaS Platforms & Enterprise Applications • Multi-tenant architecture, RBAC, SSO, and compliance audit systems • Subscription billing, real-time analytics, and workflow automation platforms • API-first design, microservices, and decoupled, event-driven architectures • Highly secure, maintainable systems engineered for predictable long-term growth 🔹 AI Agents & LLM Applications • AI Agents, agentic workflows, and automated business decision engines • Production-grade RAG pipelines, semantic search engines, and vector indexing • Multi-modal execution utilizing OpenAI API, Claude, LangChain, LangGraph, CrewAI, and MCP • Vector database optimization, evaluation frameworks, observability, and cost-tracking • Custom AI copilots and intelligent enterprise knowledge systems 🔹 API Development & Integrations • High-performance REST APIs, GraphQL endpoints, WebSockets, and webhook systems • Enterprise integrations: Stripe, PayPal, HubSpot, Twilio, and ERP ecosystems • OAuth2, OIDC, SAML identity management, and secure authorization systems • Enterprise ETL pipelines, real-time data sync, and automated caching layers 🔹 System Rescue & Performance Optimization • Legacy application modernization, monolithic decoupling, and architecture refactoring • Deep database query optimization, indexing, and schema tuning (PostgreSQL, MySQL) • System bottleneck identification, resource utilization management, and platform stabilization • Rapid technical debt reduction and codebase recovery for inherited systems 🔹 Cloud & DevOps Engineering • High-availability infrastructure deployment across AWS, Azure, and GCP • Infrastructure as Code (IaC) utilizing Terraform, Docker, and Kubernetes clusters • Continuous Integration/Continuous Deployment (CI/CD) with zero-downtime release strategies • Production telemetry setup: logging, distributed tracing, alerting, and cost optimization 🎯 COMMON PROBLEMS I SOLVE • Product roadmaps stalled due to brittle, unmanageable legacy architectures • Production databases or APIs failing under sudden traffic spikes or application scaling • Generative AI concepts that fail to perform accurately or cost-effectively in production • Cloud infrastructure costs scaling aggressively without clear business utility or ROI • Complex third-party integrations creating data silos and operational bottlenecks • Fragile, undocumented codebases inherited from departed development teams 🛠 TECH STACK • Backend: Ruby on Rails, Node.js (NestJS/Express), Python (FastAPI/Django), Laravel • Frontend: React, Next.js, TypeScript, Tailwind CSS • Databases: PostgreSQL, MySQL, Redis, MongoDB, DynamoDB, Elasticsearch, OpenSearch, Vector DBs • Cloud & DevOps: AWS, Azure, GCP, Docker, Kubernetes, Terraform, GitHub Actions, Jenkins • AI/ML: OpenAI API, Claude, LangChain, LangGraph, CrewAI, MCP, RAG, Semantic Search, NLP 🏆 WHY CLIENTS HIRE ME ✔ 16+ years of verified production experience delivering enterprise software systems ✔ Architecture-first engineering methodology focused on long-term system maintainability ✔ Transparent, business-aligned technical communication and highly predictable delivery ✔ Elite capability to lead complex projects, upskill internal teams, or operate as an autonomous lead ✔ Business-first mindset that prioritizes operational reliability, strict ROI, and commercial success If your platform is under immense pressure—whether from scale, complexity, or structural technical debt—I bring the tactical leadership necessary to stabilize your system and execute with precision. 📩 Click "Invite to Job" and let's discuss your architectural requirement.

I'm Egor — I design, build, and launch digital products end-to-end. With 10+ years in product design (ex-Ozon, Avito, Yandex), I understand how products actually work — from business goals and UX to technical execution. I don't just design interfaces — I ship working products. What I do best: - Turn raw ideas into working products (from 0 → launch) - Improve existing products — find friction, simplify flows, increase conversion - Move fast with AI tools — I actively use Cursor and AI-assisted workflows to ship faster without sacrificing quality - Work like a product partner, not just a contractor What I build: - Web apps & SaaS — React / Next.js · TypeScript · Tailwind CSS (Vercel-ready) - Subscription products — Supabase · Stripe billing · full payment flows - Admin panels, CMS, CRM — tailored to your workflow - iOS apps — design + development, App Store ready - AI agents & automation — OpenClaw · Make · n8n · GPT integrations AI & self-hosted models: - I deploy and integrate Ollama and local LLM pipelines — useful for privacy-first or offline AI workflows - I build and configure AI agents with OpenClaw / Claude API for workflow automation Who I work with: - Founders building MVPs - Startups improving product & conversion - Teams that need someone who can both design and deliver Selected clients: Ozon · Avito · Yandex · Walmart · Kroger · CoverGirl · Energizer Studio: addicted.design

I have 18 years experience as a .Net developer. I have used a number of Microsoft technologies including C#, Xamarin, Maui, WinForms, WPF, Silverlight, WCF, ASP.Net, and SQL Server. Since April 2012, I've been working heavily with Xamarin, and started migrating to Maui in 2023. I've spent that time working on a team writing an enterprise application for existing customers to assist in their day-to-day operations. I've also written, been on a team, or took over 20+ applications in my personal time using both Xamarin.iOS, Xamarin.Android, Xamarin.Forms, or Maui. My professional job is a telecommuting employee. I've been working as a telecommuting employee since January 2012. This requires the ability to work without supervision and to be a "go getter".

As a full stack game developer with 7 years of experience, I am skilled in creating dynamic and creative mobile games that are played by hundreds of thousands of users. I am well-versed in creating complex games with server authoritative architectures and integrating extensive analytics to make data-driven decisions for improving game features, retention, monetization, and playtime. In my past roles, I have developed and managed live-service games with weekly events, holiday events, and cloud feature updates. I have also created systems and processes for managing the post-release life cycle of games, as well as complex data driven systems for game monetization, AB testing for various user acquisition and retention strategies. Technical skills: * Unity, C#, Node JS * Firebase, Google Cloud Services, AWS, Azure, and other cloud technologies for backend development with server authoritative architecture * Playfab, CRM * Player authentication, social features, multiplayer games * Real-time events and tournaments * Game ads monetization, in-app purchases, analytics * I am able to assist with a variety of projects, including Android, iOS, and web game development and have experience with creating and maintaining complex server and backend services using cloud hosting platforms like AWS, Firebase, and Azure. Additionally, I have expertise in Vuforia, Gamesparks, and Unity VR. Thank you for considering me. I am available for further discussions and happy to answer any questions you may have.

Every hour of downtime costs your enterprise an average of $540,000. That's not a DevOps metric - that's a board-level problem. I design and operate infrastructure that stays up. My specialty is the full observability and reliability stack: detecting failures before users do, recovering in minutes, not hours, and building the self-healing systems that let your engineering team sleep at night. With $400K+ earned on Upwork, 100% Job Success Score, and 10+ years in DevOps and Site Reliability Engineering, I bring the broadest monitoring stack you'll find in one engineer: Prometheus · Grafana · Datadog · ELK Stack · Zabbix · Sumo Logic - combined with deep Kubernetes and cloud expertise. Typical Problems I Solve → Production incidents are frequent, and MTTR is too high → No observability - issues discovered by users, not monitoring → Need DevOps engineer for high availability infrastructure setup → Kubernetes clusters experiencing performance or reliability issues → Disaster recovery plan missing or untested → AI workloads need reliable, observable infrastructure Proven Client Results ▪️ iLost Platform (Netherlands) → Challenge: EKS performance degrading, CI/CD unstable across Dev/Staging/Production, and OpenSearch causing timeouts. → Solution: EKS rightsizing, CI/CD pipeline optimization, IAM hardening, OpenSearch performance tuning. → Business Impact: Reduced bottlenecks, improved release predictability, and optimized infrastructure costs. ▪️ Qopla Infrastructure → Challenge: Long-term SRE engagement - ongoing reliability, monitoring, and performance needs. → Solution: Continuous SRE operations, incident management, and infrastructure optimization. → Business Impact: 657-hour engagement demonstrating sustained impact. Rate progressed $40/hr → $52/hr based on results. ▪️ GetChecked (Blockchain / Multi-cloud) → Challenge: Multi-cloud infrastructure (AWS + DigitalOcean + bare-metal) with Hyperledger Fabric in a regulated environment. → Solution: Upgraded Hyperledger Fabric, implemented monitoring, backup, DR/BCP, optimized CI/CD pipelines. → Business Impact: Increased system reliability and security in a strict regulatory context. Core SRE Capabilities → DORA metrics: Deployment Frequency, Lead Time, MTTR, Change Failure Rate - measured and improved → Incident Management & On-Call: Runbooks, escalation paths, post-mortems → Disaster Recovery & Business Continuity planning and testing → Zero Trust Security: IAM, RBAC, SELinux, network hardening → High Availability: Multi-AZ, failover, load balancing, autoscaling → AI workload reliability: observability for ML pipelines and LLM infrastructure Stack: AWS · GCP · Kubernetes · Terraform · Ansible · Prometheus · Grafana · ELK Stack · Datadog · Zabbix · Docker · Linux · GitHub Actions · GitLab CI · Incident Response Plan · Disaster Recovery Available during US business hours (EST/PST overlap). Downtime is a solved problem - if you have the right observability. Send an invite and let's audit your reliability posture.