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I have more than 5 years experience working with library and scholarly publishing solutions such as Koha ILMS, DSpace repository system, OJS - Open Journals System and custom software development using a number of technologies. My skill-set includes; 1. Linux server administration 2. Angular 12+ 3. Python with Django web framework 4. Frappe Framework and ERPNext 5. Typescript and JavaScript with jQuery library I have previously worked with numerous organizations and individuals to; 1. Develop systems - install and customize software as per client requirements 2. Offer maintenance of existing systems to ensure continuity by troubleshooting and fixing issues 3. Offer cloud hosting (Amazon AWS, Linode, digitalocean) and cPanel 4. Develop custom web-based software as per clients' needs

Cloud Computing and Linux Systems Engineer I have 5+ years experience deploying and managing mission-critical and complex Linux/Unix Infrastructures. This revolves around Cloud, Virtualization and Physical server Environments. I have done a good number of Projects on Linux, Cloud, Windows and Unix Systems Integration, Automation, Security, and Performance Tuning on Different platforms - Cloud, Containers and Bare Metal. My areas of expertise are: Web and Application Servers - Apache, Nginx, Plesk, LVS, HAProxy, Cpanel, WHM, Wordpress multi-site, ISPconfig Database systems - MariaDB, MySQL, PostgreSQL Cloud - OpenStack, Cloudstack, AWS, Google Cloud, Hetzner, Digitalocean, OVH Virtualization - KVM. oVirt. RHEV, VMWare, Proxmox, XEN OS - RHEL, SLES. Ubuntu, CentOS, Fedora, Debian, Microsoft Email - Postfix, Zimbra, Office 365 Storage - NAS, SAN, iSCSI, Samba, NFS, Ceph, GlusterFS, RAID, LVM, BtrFS Programming - Python, Perl, Bash VoIP - Asterisk, FreePBX, Kamailio, Elastix, 3CX, VoipSwitch Monitoring Tools - Cacti, Prometheus, Nagios, Zabbix, Grafana Server Hardening and Security - Firewalld, Iptables, SELinux, AppArmor, IDS, IPS, Ossec, Wazuh, Alienvault, Pfsense, Mikrotiks. Logs Management - Graylog, Elasticsearch, Kibana, Logstash User Management - LDAP, FreeIPA I like hacking Tech stuff and troubleshooting any kind of server problem with 100% efficiency and within the shortest time possible. I'm looking forward to working with you. Then let's read what my previous Upwork clients had said about me: "Kelvin was awesome. Extremely patient, great communication and really knows his stuff. Will be working together again for sure :)" "With Kelvin all work is done with no supervision !! Great professional !" "Best freelancer on Upwork, hands down. Very very skilled, always available, great at communicating and very friendly.

🔧 Backend Developer | Scalable APIs, C++/Crow, PostgreSQL, Node.js | Real-Time Systems Need a fast, modular backend or a high-performance API? I'm a backend systems developer specializing in: ✅ C++ with Crow (lightweight, high-speed web framework) ✅ PostgreSQL – optimized, secure schemas and queries ✅ Node.js & Express – for API-first apps and integrations ✅ ZMQ – real-time messaging and internal systems ✅ JWT/OAuth2/Auth systems – including my custom "Paswad" auth engine ✅ JSON APIs and efficient system design for startups Whether you're building a financial dashboard, logistics platform, booking system, or internal tools, I can help you ship clean, secure, and scalable code—fast. I’ve helped fast-moving startups and lean dev teams: - Build backend MVPs in days, not weeks - Optimize slow systems and DBs - Create custom APIs with clean architecture - Integrate auth, payments, messaging, and admin panels 🛠️ Tools & Tech: C++, Crow, PostgreSQL, ZMQ, Node.js, Vanilla JS, HTML/CSS, JWT, OAuth2 🌍 Available for: urgent work, full systems, long-term backend partnerships 🕐 Timezone: Flexible | Fluent in async, calls, or Slack-based workflows 💡 Let’s build your next system with speed, clarity, and zero bloat. Ready to talk? Send me a message and I’ll respond within a few hours. Muslih | muslih.tech Backend Systems Developer | Nairobi / Remote