A white-label development partner for agencies: custom websites from design to launch, then kept up to date. I also work directly with businesses.
Based in Valencia, Spain (CET)
Track record
2012 – now
Services
Built from a Figma design on the platform that fits the project: WordPress with custom themes (no page builders), Webflow, Shopify or Next.js. If only some pages are designed, I can extend the design in its existing style.
Updates, fixes and new sections on live sites. You send a task, I estimate it and deliver it.
Moves to a new platform, redesigns built from your new design, and technical fixes: loading speed, Core Web Vitals and technical SEO.
Also: e-commerce on Shopify and WooCommerce, web apps on Next.js / React / TypeScript, API integrations, scroll and SVG animations.
Work
Harbinger is a full-service marketing agency: branding, advertising, content, SEO and websites. I work on the website side. Since 2020 I have built or maintained 40+ client sites, mostly on WordPress and Webflow: new builds from Figma, new sections, fixes and regular updates.
The work is white-label, so I don't publish it. Ask, and I'll share selected examples privately.
Palisades manages several mining and investment companies. Since 2017 I have built 10+ websites for the group, and I keep its live sites supported and up to date.
Process
Async by default. Most work runs by email or your project tool. Calls are welcome, but not required.
AI-assisted workflow. AI tools take care of routine work, so tasks move faster. Planning, technical decisions and quality control stay with me.
Testimonials
“I hired Sergey Terekhov to help with our studio's Wordpress tasks. Sergey seamlessly performs the tasks of the development of complex animation and cross-browser layout for our Wordpress websites. He is tactful in communication and complies with the agreed deadlines. Highly recommend!”
“HIRE Sergey! He's the best!! When it comes to creating professional, attractive, and effective websites, there is no one that can surpass Sergey. He's quick to respond, happy to meet your needs, and an all-around fantastic developer and designer. He is detailed, organized, creative, and just truly a pleasure to work with.”
“Sergey was extremely fast in fixing my issue and in fact was the only freelancer who was proactive in guiding me with a solution right at the start. Confident teacher and very helpful and expert in diagnosing my problem and coming up with the perfect solution. Would hire again for sure!”
“One of the best freelancers I have worked with. Competent, professional, and a pleasure to talk to. Looking forward to the next project to work with Sergey!”
About
I'm Sergey, a web developer. I started in front-end in 2012 and have worked independently since 2016. I'm from Ukraine and live in Valencia, Spain. Russian and Ukrainian are my native languages, I work in English, and my Spanish is basic. I especially enjoy visually rich sites with scroll effects and SVG or CSS animations.
Contract developerHarbinger Marketing, US marketing agency2020 – now
Contract developerA web agency in Kyiv2020 – 2024
Developer, direct clientPalisades group, Canada2017 – now
Freelance web developerIndependent2016 – now
Front-end / UI developerDevelUp, Odessa2015 – 2016
Front-end developerAttract Group2012 – 2015
Stack: Next.js, React, TypeScript, WordPress (custom themes, PHP), Webflow, Shopify, WooCommerce, API integrations, GSAP, SVG and CSS animations.
Contact
A few lines about the project or task are enough. I reply by email.
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