Sara Kozińska
Custom Code. No Templates. No Compromises.
Senior full-stack developer with 18+ years of experience building custom themes, Gutenberg blocks, and scalable web applications for clients across the US, UK, and EU.
- 18+ Years Experience
- 50+ Projects Delivered
- US / UK / EU Timezone Flexibility
- Remote-First Since 2010
Development that delivers long after the project ends.
WordPress website, but actually custom - just for
you.
I build WordPress sites from scratch — no templates, no page builders, no exact
website like this. Custom fully editable themes, Gutenberg blocks, headless setups when it makes sense. If you've been fed up by bloated theme purchases before, you'll appreciate the difference.
E-commerce that works.
WooCommerce/Shopify projects with custom checkout flows, proper payment setups, subscriptions,
multi-language—whatever your store actually needs. I've built everything from simple shops to complex
membership systems.
Web apps when WordPress isn't the answer.
Sometimes you need something WordPress can't do. I build custom applications with Vue.js or React on the
frontend, Firebase or Node.js on the backend. CRMs, dashboards, internal tools — that kind of things.
Fixing any mess.
Got a slow site? Plugins breaking after updates? Security concerns? I take on maintenance and optimization
work, including sites I didn't build.
For Agencies - Looking for a Reliable Outsource Developer?
I partner with agencies worldwide as an extension of their development team. You get senior-level WordPress expertise without the overhead—clean handoffs, clear documentation, and code your team can maintain.
Why agencies work with me:
- Clean and documented code — Your developers won't curse my name later ;-)
- Clear communication — Regular updates, async-friendly, no surprises
- Flexible engagement — Project-based, retainer, or team augmentation
- Timezone coverage — Based in Europe, flexible for US/UK hours
- White-label ready — Your client never knows I exist, if you don't want to
Currently trusted by agencies in: USA, UK, Norway, Germany, Poland.
Some of my previous projects
Performa Code performa-code.com
Tech stack: WordPress (ACF PRO based Gutenberg blocks), PHP, JavaScript, GSAP
Custom WordPress theme with dedicated Gutenberg blocks, performance optimization, and scalable content architecture. Built for a US-based software development firm.
Arkansas Corporate Suites www.arkansascorporatesuites.com
Tech stack: WordPress (ACF PRO based Gutenberg blocks), PHP, JavaScript, GSAP, Tailwind CSS
Built a WordPress theme with dedicated Gutenberg blocks, custom post types and listing templates for property managing company. Enhanced site scalability, performance and easy system to managing properties availability.
Community Trust Index www.trust.communityengagementhub.org
Tech stack: WordPress (ACF PRO based Gutenberg blocks), PHP, JavaScript, GSAP, REST API
Created a custom WordPress theme integrating interactive data visualizations, enabling dynamic updates from Excel sheets to maps and statistics.
Starapple.ai www.starapple.ai
Tech stack: WordPress (ACF PRO based Gutenberg blocks), PHP, JavaScript, GSAP
Developed a fully custom WordPress theme with dedicated Gutenberg blocks for seamless content management. Ensured performance optimization and complete translation readiness.
VILO CRM
Tech stack: Firebase (backend), Vue.js + Bootstrap (frontend), Node.js
Built a CRM web app tailored for a law office. This project included features like inter- office chat, meeting calendar, user profiles, case management (Kanban task board, document management, signature workflows), and more.
The TEFL Academy www.theteflacademy.com
Tech stack: WordPress (ACF PRO based Gutenberg blocks), PHP, JavaScript, REST API
Led the development of a WordPress-based multisite platform featuring custom components, e-commerce integration, and geolocation functionality. Enhanced site scalability, performance and 3rd party API integration.
Education
Warsaw School of Computer Science
Information Technology
October 2007 - June 2011
High School
Class Profile: Math, Physic, Information Technology
October 2004 - June 2007
Career
Ixtrim Sara Kozińska, Freelance Web Developer
Full Stack WebDeveloper
August 2019 - Present • Barcelona, Spain • Remotely, Worldwide
Working as freelance developer full time (remotely) or per project. I was working with companies such as Integrated Mobile Marketing (United States), Mobile5 (UK), The TEFL Academy (UK), and who knows... maybe yours?
netzstrategen GmbH
Full Stack WebDeveloper
October 2017 - July 2018 • Barcelona, Spain
Working as part of the company's web developers team in the Barcelona office.
Ixtrim Sara Kozińska, Freelance Web Developer
Web Developer
January 2007 - September 2017 • Warsaw, Poland
Working as a freelance developer full time. Cooperation with many companies all over the world - directly with end-client or as an outsource for bigger agencies (such as American Eagle, Hypermedia Isobar, Sparrow Design and many more).
FAMA PR Agency
Web Developer
April 2009 - October 2010 • Warsaw, Poland
Full-stack web developer in a marketing agency. I was creating interactive and animated websites using Flash / Action Script, Joomla and WordPress.
Film and Art Festival TWO RIVERSIDES
Web Developer
May 2007 - September 2011 • Kazimierz Dolny, Poland
Creation of festival website and content management. The whole project was based on CMS Joomla and created by me from scratch. Annually, we were changing the whole template and added new functionalities to the website as the festival was growing.
Let's Get In Touch
I'd really love to hear from you! Whether you have a question, quote or just want to chat about code — shoot me a message.