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I run production infrastructure and private AI systems on servers you own — Proxmox, Docker, Kubernetes, and self-hosted LLMs that keep your data out of the cloud. If your server is down or your platform needs deploying, I've got you. Day to day I run real production environments — not lab setups: Proxmox clusters, 15+ virtual machines, a K3s/Rancher Kubernetes cluster, Docker deployments, and CI/CD pipelines across multiple products. I work comfortably from the hypervisor up to the reverse proxy. What I do: - Server troubleshooting & recovery — Proxmox, Linux, VPS. Down server back online, root cause found, not just patched. - Docker deployment — Docker Compose, Nginx/Traefik, SSL, CI/CD with GitHub Actions. - Kubernetes — K3s + Rancher in production: Traefik ingress, cert-manager, persistent storage, tested backups. - Migrations — provider-to-provider, VPS consolidation, VMware → Proxmox. - VPN & networking — WireGuard, NetBird, OpenVPN, site-to-site setups. - Self-hosted apps — Nextcloud, n8n, Odoo and more, deployed securely and built to last. - Monitoring — Prometheus + Grafana + Alertmanager for production visibility. - AI/LLM infrastructure — Ollama, self-hosted models, GPU setup, n8n AI agents and workflow automation. - Windows Server & Microsoft 365 — Active Directory, Entra ID, tenant administration. Recent client work: full production stack for a Luxembourg medical practice (Nextcloud, n8n, DocuSeal, self-hosted LLM — patient data never leaves their server), and a two-site Proxmox + Proxmox Backup Server deployment for a US client. How I work: I treat your server like production — because it is. I verify the traffic path and check logs before changing anything, I document what I do so you understand it, and I never make silent changes that could break access. You get a fix that holds, plus a clear explanation of what happened and why. For clients who want peace of mind, I offer monthly server management — proactive monitoring, security updates, backups, and priority response, so problems get caught before they become outages. Tools: Proxmox VE, Proxmox Backup Server, Docker, Docker Compose, K3s, Rancher, Nginx, Traefik, GitHub Actions, Linux (Ubuntu/Debian), WireGuard, NetBird, PostgreSQL, MySQL, Redis, Prometheus, Grafana, n8n, Ollama, Let's Encrypt, fail2ban, systemd. → Tell me what's broken or what you're building — I'll tell you exactly how I'd handle it.

I help startups, agencies, and businesses build secure, scalable, and high-performance web applications using modern technologies and AI-assisted development workflows. With strong experience in backend engineering, API development, cloud infrastructure, and frontend frameworks, I deliver clean, maintainable solutions that are fast, reliable, and production-ready. What I Can Help You With ✅ Custom Web Application Development ✅ REST API & GraphQL Development ✅ SaaS Platforms & Business Systems ✅ AI-Assisted Development & Automation ✅ Third-Party API Integrations ✅ Performance Optimization & Security Hardening ✅ Legacy System Upgrade & Modernization ✅ Cloud Deployment & DevOps Setup Backend & Web Technologies • Laravel, Django, Spring Boot, Yii2 • Express.js, NestJS • WordPress, Drupal, Magento • PHP, Python, Java, JavaScript, TypeScript • MySQL, PostgreSQL, MongoDB, Redis Frontend Development • React.js, Vue.js • Tailwind CSS, Bootstrap • Alpine.js, Livewire, HTMX Cloud & DevOps • AWS, GCP • Docker, Kubernetes • CI/CD Pipelines • Linux, Nginx, Apache API & Integrations • Stripe, PayPal • Twilio, Firebase • Slack, Zapier, Xero • REST APIs & GraphQL AI Development Workflow I actively use modern AI development tools to improve delivery speed, code quality, debugging, and architecture planning: • Cursor • Claude • ChatGPT • GitHub Copilot Why Clients Work With Me ✔ Clean, maintainable, scalable code ✔ Fast communication & reliable delivery ✔ Strong debugging and problem-solving skills ✔ Production-ready deployment experience ✔ Security-focused development approach ✔ Ability to work independently and take ownership Whether you need a custom platform, backend API, cloud deployment, or ongoing development support, I can help turn your ideas into reliable software solutions. Let’s build something great together.

Are fragile deployment pipelines, runaway cloud bills, or scaling bottlenecks slowing down your engineering team? When releases feel risky and infrastructure friction hinders growth, you need systems engineered for speed, security, and cost efficiency. I am a Senior DevOps Engineer with over 5 years of experience architecting high-availability cloud infrastructure, modernizing CI/CD pipelines, and driving down operational overhead. Whether you need to scale production Kubernetes clusters, migrate away from costly SaaS tools, or implement zero-downtime release strategies, I build resilient systems that scale. What I Bring to Your Infrastructure ☸️ Kubernetes & GitOps Orchestration Multi-Cloud K8s Management: Proven experience managing production environments across AWS (EKS) and Azure (AKS), handling everything from declarative operator installation to major cluster version upgrades (e.g., upgrading live clusters smoothly from v1.21 to v1.30). Progressive Delivery & Security: Implementation of GitOps workflows with ArgoCD and FluxCD, utilizing Argo Rollouts for blue-green releases and hardening clusters with Kyverno, Cilium, Network Policies, and External Secrets Operator. Stateful Workloads: Operational administration of Kafka, Flink, RabbitMQ, and Redis on Kubernetes using custom operators and Vertical Pod Autoscalers (VPA). 🚀 Infrastructure as Code & Pipeline Automation Modular Terraform Architecture: Refactoring legacy state files into reusable, DRY Terraform modules with strict environment isolation and automated PR/MR plan guardrails. Centralized CI/CD Modernization: Designing scalable GitLab CI/CD frameworks using custom Factory Design Patterns, as well as optimizing Jenkins on Kubernetes (JCasC) to reduce Docker build sizes by up to 50% and drastically decrease build times. 💰 FinOps & Operational Cost Reduction Cloud Cost Optimization: Reduced Azure infrastructure costs by 30% using rightsizing, reserved instances, dynamic autoscaling, and serverless monitoring. SaaS Replacement: Specialized in replacing expensive third-party SaaS solutions with self-hosted, production-grade open-source stacks (Prometheus, Grafana, ELK, Loki, Harbor) without compromising performance. 🤖 AI Integration & Advanced Tooling AI Agent Delivery Workflows: Hands-on experience developing AI agent workflows, designing custom skills, and building production pipelines for AI workloads. Zero-Downtime Data Migrations: Executed seamless, zero-downtime data migrations for PostgreSQL, Redis, and multi-cloud databases. Key Work Experience Highlights Foothill Technology Solutions (Restaurant365): Architected multi-cloud Kubernetes infrastructure via GitOps (ArgoCD), built custom GitLab CI/CD Factory Component frameworks, and designed AI agent skill workflows. Homyt: Replaced Azure DevOps with Jenkins on Kubernetes, cut Azure spending by 30%, and implemented External Secrets, Harbor proxy-caching, and automated cluster security scanning. Quizplus: Refactored legacy infrastructure into modular Terraform, built enterprise AWS SES marketing campaign pipelines with reputation metric monitoring, and managed zero-downtime K8s upgrades. What Clients Usually Need Help With Stabilizing & Accelerating CI/CD: Modernizing fragile pipelines using GitLab CI/CD, Jenkins, and ArgoCD. Kubernetes Security & Reliability: Hardening clusters with RBAC, runtime protection, secret operators, and Istio/Cilium service meshes. Cloud Cost Optimization: Identifying resource waste, rightsizing infrastructure, and moving away from expensive SaaS lock-in. Infrastructure Automation: Building clean, maintainable Terraform modules for AWS and Azure setups. Complete Observability: Setting up dynamic alerting and monitoring with Prometheus, Grafana, OpenTelemetry, and ELK. Tech Stack Cloud Providers: AWS, Azure Containerization & Orchestration: Kubernetes, Docker, Helm, ArgoCD, FluxCD, Istio, Cilium, Kyverno Infrastructure as Code: Terraform, Ansible CI/CD & Automation: GitLab CI/CD, Jenkins (JCasC), Argo Rollouts, Git, Python, Bash, Java Observability & Logging: Prometheus, Grafana, ELK Stack (Elasticsearch, Logstash, Kibana), OpenSearch, OpenTelemetry, Loki, Tempo, AWS CloudWatch Data & Messaging: Kafka, Flink, RabbitMQ, Redis, PostgreSQL, AWS SES Certified Expertise ✅ 5x Certified Kubernetes Specialist: CKA, CKS, CKAD, KCNA, KCSA ✅ 2x AWS Certified: AWS Solutions Architect Associate (SAA), AWS SysOps Administrator ✅ Linux Foundation Certified: Linux Foundation Certified System Administrator (LFCS) ✅ Multi-Domain Certified: Terraform, CGOA, PCA, CAPA, ICA, OTCA, CCA, CBA, KCA If your infrastructure needs structure, your pipelines need speed, or your cloud budget is growing out of control, click the "Send Message" button below to share a brief overview of your current bottleneck. Let's get it solved.

Hello, I am Oleksandr! 🔥I build AI-integrated SaaS and mobile apps for fintech, travel & hospitality, real estate and healthcare startups and established businesses. Using React Native, Python, and React, I deliver secure MVPs from concept to launch. Backed by a 65+ dev team, I ensure scalable, compliant solutions with predictable delivery and rapid iteration.🔥 🚀 I also lead a web development team, Join.To.IT from Kyiv, Ukraine, as co-founder and CEO. We have multiple Laravel developers (Senior PHP and Custom PHP MySQL), Python (Django), and JavaScript (React, Vue, React Native) developers. If your project needs a dedicated mobile app developer, we can staff that role quickly, while I stay involved as a full stack developer to keep architecture, delivery, and communication aligned. When the UI scope grows, a senior web developer can join the project while I remain the full stack developer responsible for end-to-end quality.🚀 I’m an experienced Laravel engineer, React engineer, Vue engineer, and React Native engineer with 14 years of production experience. As a full stack developer I can build backend APIs, admin panels, dashboards, and customer-facing apps, and as a web developer I pay attention to UI details that improve conversion and retention. I’ve completed a wide range of successful projects, from MVPs to large systems with long-term maintenance and continuous improvements. My skills: React React Native Software Architecture & Design Laravel Python Full-Stack Development API Development JavaScript PHP Web Application Development Node.js AWS Development MySQL Mobile App Development Django WordPress HTML5 Tailwind CSS Web Design API Integration Stack of technologies we use: ✅ HTML/CSS, Bootstrap, Tailwind ✅ JavaScript (React, Vue, Node.js, Express, AdonisJS, Nuxt) ✅ React Native for cross-platform mobile delivery ✅ API integrations (Stripe, PayPal, Twilio, TextMagic, Xero, DocuSign, Google Maps, Meta APIs, and more) ✅ API development (Laravel, Node/Express, Firebase, Python/Django, Go, REST, GraphQL) ✅ PWA (Progressive Web App) ✅ Databases: MySQL, PostgreSQL, MongoDB, DynamoDB, Elasticsearch ✅ Infrastructure: AWS, DigitalOcean, Firebase, Supabase ✅ DevOps and administration: LAMP, CentOS, Ubuntu As a full stack developer, I connect the front end, back end, and infrastructure so releases are smooth. When the scope includes native-like UX, I can collaborate with a mobile app developer without slowing down the API roadmap, and a web developer can refine UI flows while we keep the backend stable. You can hire me as a full stack developer for full ownership, or extend the team and keep me as the full stack developer leading architecture and delivery. If timelines are tight, add a mobile app developer to parallelize mobile features, and add a web developer to accelerate dashboards and front-end work. Our team has already worked in such industries as: ✅ Marketplace ✅ E-commerce ✅ Travel and Hospitality ✅ Custom ERP (Enterprise Resource Planning) ✅ ChatGPT integration (LLM model in your website front end) ✅ Automotive (car inspection, automotive ERP, car sharing, rental, selling) ✅ Social media (Tinder-like networks, short video platforms, communities) ✅ Sales (CRM systems for sales teams, retail, hospitals, sales departments) ✅ Sport (gym management systems, trainer platforms, fitness apps, club portals) ✅ Legal (document automation, AI-assisted legal processing) ✅ Healthcare (clinic management, booking, mental health software) ✅ Education (LMS, automated training, coaching marketplaces) ✅ Finance (fintech platforms, investment platforms, bank API integrations, calculators) ✅ Manufacturing (shop floor management and automation) ✅ Human resources (HRM systems) ✅ Digital marketing (Meta, Facebook/Instagram, TikTok, Google APIs, analytics) In our work history you’ll find successful products built with Laravel, PHP, JavaScript, MySQL, React, Vue, WordPress development, Web Development, Full Stack development and React Native, plus multiple systems built with Python (Django, Flask, FastAPI). I also use LLM capabilities and AI APIs (including OpenAI integrations) when they genuinely improve the product experience. We have 65 senior developers across PHP, JavaScript, MySQL, Python, Go, and Node.js. As a full stack developer, I can jump into an existing codebase, stabilize releases, fix bottlenecks, and plan the next iterations. Don't hesitate to get in touch with me for further details and fruitful work. Best regards, Oleksandr CEO, JoinToIT

Hello! I am expert Backend Developer with almost 20 years of experience in backend, Android mobile, desktop apps, apps for embedded devices, ERP apps and web development. Proficient in developing applications in wide range of areas, including business applications and database management. Have high attitude expertise in Linux OS management, including building automated servers with set of services/tools for different purposes, virtualization tehcnologies like KVM/libvirt, containerization technologies like LXC, Docker, Kubernetes. What I can do: - Planning and implementing the app’s architecture and features. - Writing apps from the very scratch and further support. - Code Review, Fixing and supporting the apps written by others. - Working with a team of developers or solo. Technical Skills: * Languages and Frameworks: Java (Spring, Quarkus, Dropwizard....), Kotlin, C, C++, Qt, Rust, Go, Python (Django), JavaScript, PHP * Platforms: Backend, Android, Linux (Fedora, RedHat, CentOS, Ubuntu) * Technologies: Docker, Kubernetes, CI/CD, Mobile Development, Docker, KVM, libvirt, IT infrastructure monitoring tools, AWS services, GCP * Database Management: PostgreSQL, SQLite, MySQL.... - I'm open to working with big and small companies and individual clients. - I'm comfortable signing an NDA. - Prefer long-term collaboration. - Ready to work 30-60 hours per week I'm open to various projects and would love to show you my creative side too. My commitment to continuous learning keeps me updated with the latest trends and technologies, allowing me to bring cutting-edge solutions to your projects and better expreince. I am giving high attention to details, ready to resolve complicated and complex challenges, always tend to offer most efficient solution. Thanks for your time Regards Rafael S.

Available to start immediately. I build and fix real .NET & C# software. Click on Invite button to start conversation I’m a .NET Developer and C# Developer with 13+ years of experience working on production systems built in C#/.NET. Most of my work is focused on helping teams make their existing software more stable, scalable, and easier to evolve without risky rewrites. I’ve worked in long-term roles as a C#/.NET developer, often joining projects where the codebase already exists and needs structure, performance improvements, or careful modernization. 🧠 How clients usually come to me Very often, teams reach out to me as a .NET developer when they already have a product written in C#/.NET, but something isn’t working as it should. Changes are slow, bugs appear in unexpected places, or the architecture feels fragile. In those cases, I step in as a C# .NET Developer who understands how real systems grow over time and how to improve them without breaking production. Depending on the scope, I work either as a backend developer focused on logic and performance, or as a .NET Full Stack Developer when both backend and UI decisions need to be handled together. ⚙️ What I do in real projects Day to day, my work as a .NET Developer is very practical. I write and refactor C#/.NET, clean up .NET architecture, improve async flows, and make sure the application behaves predictably in production. In many projects, this naturally turns into .NET full stack work handling backend services, APIs, and UI integration where I step in as a .NET Full Stack Developer. When teams want a modern .NET Full Stack direction without splitting the codebase, I build new features or full applications using .NET MAUI/WPF/WinForms. I’ve worked with .NET apps both for new products and for migrations from older stacks like, where stability matters more than speed. 🧩 Types of systems I’ve worked on Over the years, I’ve worked as a .NET Developer, across different environments: 💻 Desktop software written in C#/.NET 🌐 Web platforms where I worked as a full stack developer on .NET backends 📱 Cross-platform apps built with .NET MAUI (Windows & Android only) 🧱 Larger products that required a true full stack developer approach 🔗 Mixed systems where .NET AI integration was part of the stack 🎮 Internal tools and simulators developed with C# 🤖 Careful use of .NET AI where it actually added value In several projects, I worked in React .NET setups, connecting React frontends to .NET backends while keeping responsibilities clean and clear. 🛠️ How I work with teams and data I’m comfortable joining existing teams and reading unfamiliar C#/.NET codebases. I focus first on understanding why decisions were made, then improving things step by step. I regularly work with SQL server, collaborate with Azure Data Engineer roles, and support data-heavy systems where performance & reliability are critical. This mix of responsibilities often places me in a .NET Full Stack Developer role even when the original task starts as pure backend work. 🛠️ Tech Stack .NET Framework, .NET 6 / 8 / 9 / 10 App Development - WPF, WinForms, WinUI, Blazor, .NET MAUI, MVVM Concurrency & Performance - Multithreading, async/await, Task Parallel Library Hardware & Protocols - Serial, Bluetooth LE, TCP/IP, UDP, RS232, RS422 Architecture & Quality - Clean Architecture, OOP, refactoring, performance tuning Security & Testing - Unit testing, Polaris, Coverity, SAST, DAST, threat modeling Data & Cloud - SQL Server, Azure Tooling - Visual Studio, VS Code, GitHub, GitHub Actions, Docker ✅ Why clients choose to work with me ✨ I think like a long-term .NET Developer, not a short-term task runner ✨ I write C# code that other C# developers can actually maintain ✨ I’m comfortable owning systems as a .NET Full Stack Developer ✨ I communicate clearly and avoid surprises ✨ I leave .NET full stack codebases cleaner and more stable than I found them 📌 Availability ✅ Available now 🌍 Remote-only ⏱️ Open to long-term collaboration If you’re looking for a .NET Developer, who can step into an existing system and improve it safely let’s chat. 👉 Send a message and we’ll review your setup together.