The best freelancers
29
System administration · Software and server configuration
Sumy, Ukraine
Professional system administration. Linux/Unix.
9361
435 0
My Skills and Experience I specialize in and work with various operating systems: Debian Ubuntu RHEL CentOS FreeBSD Windows I work with server hardware: IBM HP ProLiant Dell PowerEdge Supermicro I know how the following software should work: Web: Apache, Nginx, Lighttpd, OpenLiteSpeed Mail: Exim, Postfix, Dovecot FTP: ProFTPd, vsftpd, PureFTPd DNS: BIND, PowerDNS DHCP Gateway: NAT, traffic shaping Proxy: Squid Directory: LDAP AAA: FreeRADIUS VPN: IPsec-based, OpenVPN, PPTP, L2TP TFTP NTP Syslog TLS/SSL SNMP Virtualization: KVM, Xen, VMware ESX, OpenVZ, Proxmox Backup and Restore: RSYNC Revision Control Systems: CVS, SVN, Git File Sharing: NFS, SMB Software-Defined/Network-Based Storages: DRBD, Ceph, iSCSI, AoE Printing Systems: CUPS I am familiar with databases: PostgreSQL MySQL I have experience with monitoring systems: Zabbix Cacti Munin I also work with: Telephony: Asterisk (FreePBX, Elastix, MikoPBX) Routers: Mikrotik, All (Firmware OpenWRT, DD-WRT), hardware repair Billing systems for Internet Service Providers: Abills, Ubilling (building networks from scratch) Billing systems for hosting providers: BillManager, RootPanel, WHMCS Hosting panels: ISPManager, CPANEL, BrainyCP, VestaCP, ISPConfig, aaPanel, HestiaCP PON equipment (ONU, OLT): BDCOM Switches: Mikrotik, D-Link, TP-LINK, Cisco I have extensive experience in these areas. Feel free to reach out to me, I'll answer all your questions!
Please note: I do not engage in website development.
2550
38 0
Sergii Yanov
System Administrator, Programmer
Skills
Automation of accounting and finance.
Business process development.
Analysis and resolution of software issues, including 1C.
Project development and technical documentation.
Development and implementation of data analysis systems.
Integration of software systems.
Planning and deployment of network and technical infrastructure.
Maintenance and repair of computer and server hardware.
Deployment of monitoring and backup systems.
Development, optimization, and implementation of network infrastructure.
Configuration and maintenance of networking devices (including Microtik and Cisco).
Virtualization system setup.
Selection and optimization of hardware.
Software development and customization.
Work History
Jun 2017 - Oct 2023 Freelancer
Private Entrepreneur Yanov S.V., Dnipro
My professional activities encompass a variety of projects related to equipping, optimizing, supporting, and implementing the information infrastructure of enterprises. I am also involved in servicing and repairing computer equipment, as well as server infrastructure based on Windows and Linux platforms.
My work includes deploying monitoring systems and creating data backups to ensure the reliability and security of information. I design, implement, and integrate the network infrastructure of enterprises, as well as configure and maintain network equipment.
In my toolkit, there is also the configuration and maintenance of virtualization systems, virtual servers, and workstations. I engage in selecting and optimizing hardware for various projects, such as accounting systems, CRM, and web products. Additionally, I develop and customize software, including CRM systems, web applications, and accounting systems.
My professional scope also encompasses configuring network equipment, including devices from Microtik, Cisco, and other manufacturers. I have experience working with various models and brands of network equipment, ensuring its proper functioning and alignment with the infrastructure needs of enterprises.
Mar 2016 - Jun 2017 Analyst-Programmer of Information Systems
Biosphere Corporation, Dnipro
In my previous role at Biosphere Corporation, I undertook a diverse array of pivotal responsibilities geared towards enhancing operational efficiency and the agility of corporate procedures:
My contributions significantly bolstered operational efficiency, curtailed risks, and elevated corporate resource management. I was an integral part of a team fervently dedicated to the continual enhancement and innovation within the realm of information technology and corporate process governance.
Furthermore, my responsibilities extended to strategic planning and the deployment of network and technical infrastructure meticulously tailored to the specific requirements of my projects. This task demanded not only the formulation of an optimal infrastructure to underpin business processes but also the assurance that each project boasted a dependable and high-performance technical foundation.
Aug 2013 - Mar 2016 IT Director
Exim Textile LLC, Dnipro
My experience includes deploying server and network infrastructure, implementing, supporting, and enhancing the 1C ERP system, as well as automating warehouse operations. My responsibilities encompassed the following key aspects:
All these tasks required a wide range of knowledge and skills in the fields of information technology, accounting, and business process automation. My work contributed to enhancing the company's efficiency and competitiveness by ensuring the reliability and accuracy of information systems, as well as optimizing resource and process management."
Please note that this translation is provided for reference, and you may want to review it for any specific terminology or context adjustments depending on your needs.
Mar 2003 - Jul 2013 Director
Private Entrepreneurship (PE) SV-Service, Dnipro
Technical IT Maintenance and Repair:
Diagnostics and repair of computers, laptops, and tablets of various brands and models.
Installation and configuration of operating systems (Windows, Linux, macOS) and application software.
Replacement and maintenance of hard drives, RAM, motherboards, graphics cards, and other components.
Collaborating with clients to identify and resolve technical issues, providing technical support and guidance.
Installation and updating of antivirus programs and ensuring data security.
Technical Maintenance of Office Networks:
Regular technical maintenance of office computers and networks.
Troubleshooting hardware and software issues to minimize downtime for employees.
Managing computer equipment inventory and upgrading components as needed.
Assisting users with computer and software setup and usage.
Working with 1C Products:
Selection and consultation of clients on suitable 1C products based on their needs and business processes.
Active participation in sales, including product presentations, creating commercial proposals, and contract negotiations.
Implementation and configuration of 1C products for clients, including user training and initial support.
Project management for the implementation of 1C solutions, from requirements gathering to successful deployment.
Website Development and Integrations:
Website development using modern technologies and platforms.
Customizing accounting systems to meet client-specific requirements.
Developing integrations to optimize business processes and data exchange between various systems.
Aug 2001 - Feb 2002 Systems Administrator
State Enterprise "UkroptGroceries", Dnipro
My professional activity focuses on ensuring the reliable and uninterrupted operation of the enterprise's information infrastructure, as well as on the development and improvement of software for financial and production management. My role includes the following key responsibilities:
Windows Server Management and Administration:
Optimization and support of Windows-based computers and servers to ensure high performance and reliability.
Deployment and configuration of new servers, as well as data migration when necessary.
Management and monitoring of server resources to prevent overloads and failures.
Network Infrastructure and Security:
Configuration and support of network devices, including routers, switches, and firewalls, to ensure reliable connectivity and security.
Configuration and updating of software, including patch installation and security updates, to minimize vulnerabilities and risks.
Data Management and Backup:
Implementation of a data monitoring and automatic backup system to ensure data integrity and rapid recovery in case of failures.
Development and implementation of data storage strategies for efficient resource management and data availability.
Data Security and Network Security:
Configuration and maintenance of firewalls and antivirus systems to ensure a high level of data and network security.
Development and implementation of security policies, as well as monitoring and response to potential threats.
User Support and Accounting:
Providing technical support to employees, including troubleshooting technical issues and IT consulting.
Installation, support, and customization of software for financial and production management to optimize business processes and improve efficiency.
This comprehensive approach allows me to effectively manage and maintain the IT infrastructure, ensuring its stability, security, and alignment with the organization's goals
Education
Sep 1998 - Jun 2003 Specialist's Degree: Transport Process Management
Dnipro National University of Railway Transport - Dnipro, Ukraine
Sep 1987 - May 1998 High School
School #139 - Dnipro, Ukraine
Car repair and various electrical equipment repair
Languages
Russian: Native language.
Ukrainian: Native language.
English: Intermediate, actively learning.
Installing, configuring and maintaining servers.
Frequently serviced services: Apache, Nginx, PHP, MySQL, FTP (vsftpd, proftpd), Mail server (Dovecot+Postfix+Roundcube), SVN/GIT, Asterisk (VoIP/Vicidial), SMS Server for GoIPx gateways, Samba, Internet-Gateway , Squid/Dansguardian, VPN/OpenVPN for accessing internal company resources from outside.
Setting up and working with Elgato SIM bank, Elgato GSM gateways and GoIPx GSM gateways, setting up and maintaining computer client systems and workstations, setting up and maintaining small local networks.
Router settings: Mikrotik, EdgeRouter, Keenetik, Ubiquiti Wi-Fi hotspots
Setting up DVRs and IP cameras: Dahua, Hikvision
741
4 0
663
1 0
Hi! My name is Denis. I am from Ukraine!
I am a Front-end developer with experience of more than 1 year. I am a new freelancer with experience in developing and maintaining web applications and with each order I progress in this to fulfill all your desires. I am a quick learner and have good communication skills. Email me and we can realize all your ideas.
My technical skills include:
- HTML5
- CSS3, responsive WEB, CSS Flexbox, SASS, Tailwind
- JavaScript
- React (Redux and React-Router)
- Node.js
- npm and Webpack
- Git
- PhotoShop, Zeplin, Figma
- CMS WordPress + Elementor.
I'll always be happy to help and suggest some details. Feel free to contact me and have a nice day!
With best wishes! Denis.
Web programming · Website development
Ukraine
With great power comes great electricity bill
486
Here you can see my CV
328
4 0
JavaScript developer with 3+ years of experience in software development. Curious,
enthusiastically exploring new technologies, prefers complex tasks and challenges. Has
strong experience working with JavaScript especially in Front-end and Back-end (Node.js).
Open to innovations, quick-learner, able to quickly immerse in new technology in a short
time. Good team player, responsible, purposeful, balanced.
Skills Programming Languages: JavaScript, Typescript Markup: HTML5, CSS3, Sass/SCSS, Styled components, Emotion, Bootstrap Back-end development: NodeJs, Express, Nest.js, TypeORM, Mongo/Postgres/Redis, Socket.IO, JWT, OAuth (Gitlab/Google), Docker. Front-end development: React, NextJs, React Router, MobX/Redux, Socket.IO, Axios, JWT, React-query/SWR, Formik/React-hook-form, yup, MaterialUI, i18next. Testing: Jest, React Testing Library. VCS: Git. Build tools: Webpack. Сode analysis: Eslint, Prettier, Babel. Issue tracking tools: Jira, Trello. Deployment: CI/CD, AWS, Vercel.
DevOps · System administration
Kharkiv, Ukraine
I can manage with anything. If I don't know how to do something, I'll learn and complete it.
318
- I am a System Engineer with more than 20 years of extensive experience in systems design,
administration, support including 5 years working as a DevOps Engineer.
- My expertise encompasses effective planning, design, installation, configuration, maintenance, and optimization of IT systems for achieving high availability and performance.
- I am skilled in working with cloud computing platforms such as Amazon Web Services, creating and configuring the infrastructure using IaC tools, and working with CI/CD process and source control tools.
- Additionally, I have experience as a Chief Technology Officer and Head of IT Department with 6 immediate subordinates and general team of 12 employees. It helped me to develop good planning and organizational skills, so I am confident working independently or as part of a team.
- work as an individual entrepreneur.
CLOUDS
- AWS: EC2, IAM, AMI, S3, VPC, SubNets, SecurityGroup, ACL, Routing, NAT GW, InternetGW, BastionHost, VPN, Route53, Lamda, ALB, ELB, Auto Scaling Group, Parameter Store, SNS, SQS, WAF, CloudFront, CodeCommit, Beanstalk, EKS, Kinesis, Redis
OS
FreeBSD, Linux (Ubuntu, CentOS, AWS Linux)
VIRTUALIZATION
Docker, Docker-Compose, Kubernetes ( K8s ), KVM, VMware ESXi
MONITORING
Nagios, Zabbix, Prometheus
MySQL
optimization, clustering (replication setup, configuration, recovering)
IaC, Config control
Terraform, SaltStack, Ansible
Dev auto tools : Jenkins (groovy scripting), GitLab (CI/CD, configuring gitlab-ci.yml)
Version control : Git
Scripting : Bash, Python
NETWORKING
- NET : TCP / IP stack. CARP
- Routing : OSPF, BGP
- CISCO : vlan, trunk, ports aggregation LACP, static routes configuring, acl.
FAILOVER
RAID, link aggregation; redundant channels and STP, net interfaces aggregation, load balancing and traffic distribution at various levels of the OSI model (CARP, BGP, OSPF, Nginx, HProxyServer, CDN GeoDNS)
TELEPHONY
VoIP server Asterisk integrated with PBX (with PRI) PBX - Samsung iDCS 500 (PCMMC OfficeServManager 3.75) programming, cross patching and laying of SCS. Mitel 3300, wifi Mitel phones
SATELLITE & GSM
Seatel ACU, iDirect modem, FB250, Iridium, Internet/telephony/TV via satellite systems and a GSM operator.
Misc
ELK Stack (Kibana), Jira, FireWall (ipfw, pf, iptables), VPN (OpenVPN, mpd5, netgraph), Samba, Postfix, Exim, Apache, Nginx, php-fpm, FTP
302
300
Motivated and hardworking Front-End Developer with experience of developing fully responsive single- and multi-page websites of different structure and complexity using Mobile-first approach.The main technology stack used in development - HTML, CSS, JavaScript, React.js and Next.js, as well as BEM, Bootstrap, SCSS, React Router and Redux Toolkit. Focused on continuous learning and self-improvement. Special attention to details and meeting deadlines as well as delivering quality output by writing readable and clean code.
I can work self-independently or on a part of bigger project.