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At Roobykon Software, I specialize in automating, scaling, and optimizing infrastructure and development workflows to help our clients achieve efficient, reliable software delivery. With over 10 years of hands-on experience as a Senior DevOps Specialist, I ensure robust integration and scalable operational environments for every project. Our team is dedicated to empowering companies to build and grow their marketplace businesses with cutting-edge DevOps solutions. 🏆 Area of expertise: • E-commerce (including multi-vendor marketplaces and product/service platforms) • FinTech (payment gateways, escrow systems, and custom financial solutions) • CRM Systems (tailored customer relationship management platforms) • Logistics (marketplaces for delivery, warehousing, and transportation) • Marketplace Development (B2B, B2C, peer-to-peer, product, service, and rental-based platforms using Sharetribe and custom-built solutions) • Travel and Tourism (booking platforms for accommodations, experiences, and tours) • Car Rent and Rental Websites (multi-vendor vehicle rental platforms) • Retail (multi-vendor e-commerce platforms, digital storefronts) • Construction and Real Estate (property listing marketplaces, contractor bidding platforms) • Aviation (charter services, private jet booking platforms) and boat rental (yacht, boats, jet ski) • Entertainment and Social Networking (event booking, ticketing, and social interaction platforms) • Marketing and Advertising (customized marketplaces for ad placements, influencer marketing platforms) • Insurance (platforms for comparing and purchasing insurance policies) • Industrial (B2B marketplaces for industrial goods and services) • Marketplaces for hospitality services, catering, and restaurant supplies • Mental Health and Healthcare (platforms for telemedicine, therapy services, healthcare provider listings) • Management (resource management platforms for HR, procurement, and project collaboration) Got an idea but unsure how to make it happen? We’ll provide tailored solutions to fit any budget and ensure everything is ready to go. With every project, we work as if it’s our own, always prioritizing your success. Buzzwords: Automation Continuous Integration Continuous Deployment (CI/CD) Infrastructure as Code (IaC) Microservices Orchestration Docker Kubernetes Monitoring Logging Containerization Scalability Load Balancing High Availability Disaster Recovery Fault Tolerance Infrastructure Automation Blue-Green Deployment Canary Deployment DevSecOps Secrets Management Immutable Infrastructure Jenkins Ansible Terraform GitOps Incident Management Rollback Auto-scaling EC2 S3 Lambda RDS Elastic Beanstalk CloudFormation ECS Fargate EKS Route 53 CloudWatch IAM SQS SNS CloudFront VPC Elastic Load Balancer (ELB) Redshift DynamoDB AWS Backup AWS CLI CloudTrail Security Groups DNS Management SSL Certificates Hosting Control Panel Domain Management Website Security cPanel Website Backup GoDaddy API Dynos Heroku Pipelines Add-ons Heroku Postgres Heroku Redis Heroku CLI Automated Deployments Buildpacks Git-based Deployments Jenkins CircleCI GitLab CI GitHub Actions Travis CI Pipeline Automation Continuous Testing Continuous Delivery Code Coverage Artifacts Rollbacks Webhooks Build Automation Docker Integration Deployment Automation Serverless Architecture Cloud Infrastructure Virtual Machines (VMs) Networking Configuration Load Balancers Storage Solutions Infrastructure Scaling VPC (Virtual Private Cloud) Network Security Monitoring Infrastructure as Code (IaC) Infrastructure Optimization Marketplace Development Multi-vendor Marketplace Sharetribe Go Sharetribe Flex Custom Marketplace Development Payment Gateway Integration Marketplace Scalability Sharetribe API Marketplace UX/UI Sharetribe Deployment MVC Architecture ActiveRecord Gem Bundler Action Cable RESTful APIs Convention over Configuration Rails Engines Active Job WebSocket Support Background Jobs TDD (Test-driven Development) Sharetribe Customization Sharetribe Expert Sharetribe Flex Sharetribe Go Sharetribe Expert Sharetribe Flex Developer Sharetribe Go Developer New Sharetribe

Hi, my name is Arsen. I’m a Senior C++ and Python developer with 5+ years of experience building software for Linux, Windows, and embedded systems. I focus on clean, efficient, and reliable solutions for low level, backend, and performance critical tasks. What I bring to projects: • C/C++ development: STL, Boost, Boost ASIO, Qt, WinAPI, OCCI, V8, POSIX, multithreading • Python development: automation tools, data pipelines, backend logic, Django • Database engineering: Oracle, SQLite, MongoDB, data export tools, batch processing, custom type conversion • Linux systems programming: networking utilities, driver level interaction, Linux kernel headers, OpenWRT, desktop and CLI tools • Wireless and low level networking: Generic Netlink, nl80211, libnl/libmnl, Wi Fi scanning tools, protocol and frame parsing • Reliability and performance: profiling, transactional workflows, data integrity focused design, Dockerized builds, CI/CD with TeamCity • Cross platform delivery: Linux and Windows applications, Make, CMake, Conan, Git/SVN, GDB, Valgrind, Doxygen, Bash I have built tools ranging from high performance Wi Fi scanners in C that interact directly with the Linux wireless stack, to cross platform C++ command line utilities that export Oracle data into SQLite with transactional safety and performance profiling. I am comfortable working close to the system, optimizing throughput, handling large datasets, and designing software that is maintainable and stable in production. Clients usually trust me with complex backend, systems, and infrastructure related tasks where performance, correctness, and long term reliability matter. If you are looking for a developer who can work on C++, Python, Linux internals, networking, or data heavy applications, let’s talk. 🙂

I have more then 7 years experience in networking (routing,VPN, link reservation(failover), trafic priority etc. ), and more then 15 years of design and develop ERP systems for milk, beer, agro and other production industry. 2017-04-01 MikroTik MTCNA 1704NA7632 2017-04-14 MikroTik MTCWE 1704WE8685 2017-04-28 MikroTik MTCRE 1704RE10039 I love my job and hope you need my skills. I would be happy to communicate with interesting people.

I'm UNIX/Linux System Administrator and DevOps engineer with 20 years experience. I have in setting up and managing servers, optimizing them for best performance and security aspects. I have expertise with setting up baremetal servers of various brands via IP KVM, IPMI, DELL DRAC, HP ILO. I'm working with virtualization platforms such as - VMWare, XEN, KVM, Microsoft Hyper-V, VirtualBOX. I'm working with cloud solutions as Amazon AWS, Google Cloud, Microsoft Azure I have set up and manage web servers using Apache/NGINX, configure HA clusters by using NGINX, Haproxy. The database servers administration MySQL, MariaDB, Percona, Oracle. Also, I have strong knowledge and experience with Windows Server various editions and Windows Dekstop platforms (Windows 10/11) I have great knowledge and strong experience with VPN technologies OpenVPN, PPTP, L2TP, IPSec, Wireguard. Very good knowledge and experience in troubleshooting.

We build high-performance, low-latency applications using C++20/23/26, taking complex systems from architecture to production and scaling them to enterprise-grade products. 🥇100% Job Success Score | 1,000+ projects | 32+ years in Software Engineering. Our team of engineers and data scientists specializes in systems programming, embedded firmware, and real-time data processing. We help you turn complex concepts into market-ready platforms, bridge the gap between scientific methods and robust software development to deliver hardware-optimized solutions that drive ROI. Besides development from scratch, we specialize in Legacy Modernization, refactoring outdated C/C++ codebases into modern, memory-safe architectures, and optimizing existing systems to reduce technical debt and improve stability. ✅ Core Services: 🔹Full-cycle Systems Development: PoC, high-load architecture, and first-release deployment. 🔹Staff Augmentation & Dedicated Teams: Seamlessly extending in-house capabilities with C++ experts. 🔹Low Latency & HFT: Optimizing mission-critical trading platforms and real-time data engines. 🔹Embedded & Firmware: Custom driver development and firmware for ARM64, STM32, and IoT devices. 🔹Performance Refactoring: Enhancing existing systems by moving bottlenecks from high-level languages to optimized C++. 🔹Ongoing Support: Continuous optimization ensuring your system adapts to new hardware and market demands. 📊 Notable Project Outcomes: 🔹High-Frequency Trading: Optimized a core engine using C++23, reducing task overhead by 50-100ms and improving parallel processing. 🔹IoT & Automotive: Developed a real-time monitoring system for temperature and location tracking, reducing cargo spoilage by 15%. 🔹Healthcare & AR: Created a Telehealth app with AR-based orthopedic monitoring and high-speed image processing. 🔹AdTech SaaS: Built a cross-screen advertising platform managing rich media delivery across millions of digital screens. 🔹Education & Simulation: Optimized a 3D anatomy platform, reducing data load by 40% through custom C++ rendering logic. 🔑 Technical Capabilities: 🔹Languages & Standards: C++23 (latest MSVC/Clang/GCC), C++26 (draft features), Modern C# 13, Python Integration. 🔹Libraries & Frameworks: Qt 6.x, Boost, STL, gRPC, Protocol Buffers, OpenCV, POCO. 🔹Hardware & OS: Windows (WinUI 3), Linux (Kernel/Drivers), ARM, STM32, AVR, PIC. 🔹Build Systems & Tools: CMake (de-facto standard), Ninja, Conan, vcpkg, Docker, GDB/Valgrind profiling. We utilize AI where it adds measurable value, reducing operational time by up to 50% without compromising architecture decisions, cybersecurity, or code quality. ✅ Why Clients Choose NIX: 🏆 32+ years in Enterpise Development | 3,500 projects | 100% Job Success. 🛠 Full-Cycle Expertise: From bold idea to enterprise-level application. ⚡ Fast & clear communication: Always aligned & transparent. 📅 Available to start immediately. Ready to optimize your system for maximum performance? Let’s schedule a 30-minute technical discovery call. We’ll perform a high-level feasibility check on your architecture, discuss the most effective optimization strategy, and outline a clear roadmap to production.

I focus on building reliable systems and enjoy digging into complex issues — performance tuning, disaster recovery, finding root causes, and solving problems that aren't always straightforward. With 20+ years in system administration and infrastructure engineering, I work with both legacy systems and modern environments — from bare metal servers to virtualized and containerized setups. 🚀 Key areas I work with: • Infrastructure setup and migrations (bare metal ↔ VM ↔ cloud) • Troubleshooting and performance tuning (high CPU/load, slow systems, bottlenecks) • Email deliverability (SPF, DKIM, DMARC, spam issues, warmup, mail server reputation restoration) • Virtualization and containerization (VMware, Proxmox, KVM, Docker) • Networking and VPN solutions • Disaster recovery, backup strategies, malware cleaning, and finding the point of intrusion. • Long-term systems support and maintenance 🛠 Legacy Systems & Industrial Equipment Support • Migration and virtualization of legacy systems (DOS, Windows 3.x/9x/NT/2000) • Running outdated software on modern hardware via virtualization • Recovery systems from old working HDD to VM, if native hardware fails. Including industrial PCs. 🔧 Core Expertise • OS: FreeBSD, Linux (CentOS, AlmaLinux, Rocky, RHEL, Ubuntu, Debian, Gentoo), Windows, Windows Server • Virtualization: VMware vSphere, ESXi, Proxmox, KVM, oVirt, VMware Workstation, Virtualbox • Containers & Automation: Docker, Docker Compose, Jenkins, Ansible • Web: Nginx, Apache, LiteSpeed, Tomcat, Lighttpd, Caddy • Databases: MySQL, MariaDB, PostgreSQL, MongoDB • Mail systems: Postfix, Dovecot, Courier Cyrus, Rspamd, Postgrey, PostfixAdmin, SquirrelMail, Roundcube, SPF, DKIM, DMARC, MTA-STS, AWS SES, Mailgun, Sendy • Control panels: WHM/cPanel, VestaCP, Virtualmin, Cyberpanel, and so on 🔐 Networking & VPN • WireGuard, AmneziaWG, OpenVPN, StrongSwan, tinc, mpd5, IPSec, L2TP, IKEv2 • BGP (quagga), Squid (including LDAP and Kerberos auth), DNS (BIND), DHCP, TFTP • Fail2ban, iptables, ipfw, pf, csf 💾 Storage & Backup • TrueNAS Core/Scale, FreeNAS, SAN (iSCSI), ZFS, AWS S3, Backblaze, Wasabi • Veeam Backup & Replication, XSI Backup, rsync, rsnapshot, rclone ⚙️ Other • Samba3 + LDAP, Samba4 (NT4 and AD domains analog, LDAP, domains up to 500 users, GPO, roaming profiles) • Monitoring: Zabbix, Prometheus, Grafana • Services: Memcache, Redis, OpenLDAP, NFS, SVN, Git, GitLab (self-hosted), FTP, SFTP • Platforms: Moodle, Nextcloud, OnlyOffice, BigBlueButton, DAViCal, WordPress, Magento • Remote management: AnyDesk, TeamViewer, Radmin, Ammyy Admin, RustDesk, MeshCentral • Hardware: Dell, HP, Supermicro servers, Dell PowerVault storages • Networking equipment: HP, Dell, 3Com switches • Embedded/firmware: DD-WRT (including software cross-compiling for ARM) • Scripting: Shell scripting, Python, PHP Have an interesting or unusual problem? That's exactly what I enjoy — feel free to reach out. I value long-term collaboration and quality over quick fixes.