s
sergkh

Sergey K

@sergkh

FullStack Software Engineer

Armenia
Armenian, English, Russian
About me
Hi, I’m Sergey, a Full-Stack Software Engineer with 9+ years of experience building SaaS platforms, business systems, websites, APIs, automation tools, and custom web applications. I work with PHP, Laravel, WordPress, backend logic, REST API integrations, VPS/server setup, and performance optimization. I help clients fix bugs, improve existing systems, and build reliable solutions with clean code, clear communication, and fast delivery.... Read more

Skills

s
sergkh
Sergey K
Offline • 
Average response time: 1 hour

See my services

Bug Fixes
I will fix urgent laravel bugs and backend issues
From$25 / projectMore details
AI Chatbot Development
I will develop custom telegram bots and automation tools
From$50 / projectMore details

Portfolio

Work experience

Upwork

Full-Stack Web Developer

Upwork • Freelance

Apr 2021 - Present • 5 yrs 1 mo

Worked as a Full-Stack Web Developer on SaaS platforms, custom web applications, automation systems, admin panels, APIs, and scalable backend solutions for clients across different industries. Handled full-cycle development including backend architecture, database design, REST API integrations, payment systems, business logic, performance optimization, bug fixing, server configuration, and long-term project support. Worked with PHP, Laravel, Node.js, MySQL, Redis, Linux, Nginx, WordPress, OpenCart, JavaScript, jQuery, REST APIs, and third-party services. Focused on building reliable, maintainable, and high-performance systems with clean architecture, optimized database queries, secure integrations, and clear communication with clients.

Self_Employed

Self Employed

Part-time • 8 yrs

Full-Stack Web Developer

Mar 2021 - Nov 2024 • 3 yrs 8 mos

Worked with Lead Web Studio as a Full-Stack Web Developer on custom business platforms, web applications, admin panels, automation systems, and client-focused web solutions. Handled backend development, database structure, business logic, API integrations, dashboards, CRM/ERP modules, payment-related features, bug fixing, performance improvements, and support for existing projects. Worked with PHP, Laravel, RedBeanPHP, MySQL, JavaScript, WordPress, OpenCart, REST APIs, third-party services, and server-side logic. Focused on building reliable, maintainable, and practical web solutions for small and medium-sized businesses across different industries.

PHP / Full-Stack Web Developer

Dec 2016 - Apr 2021 • 4 yrs 4 mos

Worked as a freelance Full-Stack Web Developer on a wide range of commercial web development projects for clients across different industries. Delivered custom websites, landing pages, e-commerce projects, admin panels, CRM/ERP modules, automation tools, and PHP-based business systems. My work included both building new solutions from scratch and improving existing projects. Handled backend development, database structure, business logic, bug fixing, API integrations, payment integrations, form processing, user dashboards, content management features, and performance improvements. Worked with PHP, RedBeanPHP, MySQL, WordPress, JavaScript, HTML, CSS, Bootstrap, jQuery, API integrations, and server-side logic. I also helped clients fix broken features, improve website speed, optimize database queries, and make their projects more stable and easier to manage. This period gave me strong hands-on experience with real client requirements, fast delivery, clear communication, debugging existing codebases, and building practical web solutions for small and medium-sized businesses.