
Gero Nikolov
Verified Expert in Engineering
Full-stack WordPress Developer
Sofia, Bulgaria
Toptal member since August 20, 2020
Gero is a full-stack developer, solutions architect, and AI integration specialist focused on scalable digital products and efficient workflows. Since 2016, he has delivered platforms across WordPress, eCommerce, media, iGaming, and fintech. Gero specializes in AI integrations, automation, and AI-assisted systems that help teams move faster, reduce manual work, and turn complex business needs into reliable, production-ready solutions.
Portfolio
Experience
- WordPress - 10 years
- PHP - 9 years
- JavaScript - 9 years
- Full-stack - 6 years
- MySQL - 6 years
- WordPress Plugins - 6 years
- REST - 6 years
- WordPress Optimization - 6 years
Preferred Environment
MySQL, JavaScript, PHP, WordPress, REST APIs, Laravel, AI Agents, AI Integration, OpenAI, Automation
The most amazing...
...part of my career has been leading AI adoption through practical integrations, automation, and high-efficiency digital workflows.
Work Experience
PHP WordPress Plugin Developer
Causemetric LLC
- Integrated multiple WordPress plugins into a single, streamlined core using the existing system and a custom autoloader.
- Provided comprehensive support across various web needs, including WordPress, ensuring all requirements were met.
- Created a cutting-edge v3 consolidation core that seamlessly combines products into a well-organized modular system, easily managed as a WordPress plugin.
- Pioneered AI-assisted development workflows that accelerated code discovery, debugging, and delivery across PureCharity.
- Used AI to audit complex shortcode, sponsorship, and fundraising flows, reducing manual investigation time.
- Integrated AI into day-to-day engineering execution to improve speed, traceability, and decision quality across PureCharity.
CEO | CTO
ExMoment Ltd
- Led the design and execution of Exo’s AI-first architecture, integrating Codex and Operator AI into production systems for US and EU private companies, resulting in measurable efficiency gains and faster deployment cycles.
- Delivered a keynote speech on AI adoption and workflow automation in 2025, showcasing Exo’s applied use of large language models to a global audience and strengthening the company’s positioning as a thought leader.
- Directed successful partnerships with private US firms, deploying AI-driven solutions that cut operational bottlenecks and increased client revenue performance, securing repeat contracts and long-term retention.
- Scaled Exo’s proprietary AI tooling across internal and client projects, enabling 10x faster code generation, documentation, and deployment while maintaining PSR-4/WordPress coding standards and strict security compliance.
- Invented the Codex Directive, a structured AI execution framework that enforced scope clarity, reduced hallucinations, and improved quality control across development, documentation, and content operations.
- Built ExMoment Author as an AI-powered publishing system, pioneering structured content workflows that combined WordPress, prompt logic, and automation to accelerate SEO content production at scale.
Front-end SEO Developer
CPAR Media
- Resolved critical server issues, eliminating frequent errors and unexpected 500 server crashes, improving website reliability and customer satisfaction.
- Boosted website performance by significantly improving Google's Core Web Vitals scores from 70 to 90+, greatly enhancing site speed, user experience, and SEO rankings.
- Implemented tailored optimizations across multiple brands, enhancing overall site performance, user experience, and search engine visibility.
- Led AI-assisted SEO and engineering optimization for ShipTheDeal, using AI to diagnose indexing and duplicate-content issues, speed up Laravel debugging, improve sitemaps and internal linking, and scale upgrades across 30,000+ store pages.
PHP Developer
U.S. Digital Sciences Corporation
- Delivered a Shopify to WordPress (WooCommerce) migration and sync connector with SEO-safe URL mapping and inventory and price updates. Enabled near-real-time product sync and zero-downtime cutover.
- Built a Magento companion application (brands, collections, filters, and fitment) that simplified catalog discovery and improved conversion while preserving crawlable, schema-rich pages.
- Integrated Codex AI into engineering—auto-ticketing, scaffolding, and docs—shrinking cycle time, improving PR quality, and standardizing SEO documentation for faster knowledge reuse.
- Refactored legacy WordPress and Joomla into PSR-4 modules with strict security and a single-queue cron utility. Eliminated stuck jobs, stabilized releases, and improved Core Web Vitals.
WordPress Developer
Flirt Marketing Inc
- Provided thorough reviews, analysis, and recommended tailored solutions and future enhancements for the client's system.
- Ensured seamless communication and coordination with our Support team, ensuring prompt access to vital information when needed.
- Achieved all objectives within 80% of the planned time, saving costs by an extra 20%.
WordPress Developer
Lightricks US Inc
- Led PopularPays' rebranding, boosting their market presence through strategic collaboration and team leadership.
- Created a tailored WordPress page builder for PopularPays, enhancing their digital platform for improved customer engagement.
- Supported PopularPays' shift to Webflow on the client's decision, optimizing web processes and compiling a knowledge drive for continued excellence.
WordPress Developer (via Toptal)
YesChef Ltd
- Designed a seamless migration process for transferring legacy subscriptions to their new setup, demonstrating my dedication to delivering efficient solutions.
- Incorporated robotic process automation (RPA) scripts into their advanced WordPress setup, improving data collection and streamlining testing processes to boost efficiency.
- Integrated Elementor Core modules into their fast WordPress setup, enhancing website performance and user experience to drive better results.
WordPress Expert
Institute of Advanced Research in Artificial Intelligence (IARAI)
- Oversaw a successful launch, resulting in over 100 active data submissions within the challenge period, showcasing my strong leadership during key project stages.
- Improved the legacy back-end architecture continuously in real-time, ensuring optimal performance with each enhancement.
- Supported the team throughout their challenge season, showing dedication to our collective success through collaborative problem-solving.
Web Development Team Lead
Credissimo
- Spearheaded numerous deployments during the winter, the busiest season, ensuring our company's continuous success and efficiency.
- Developed and launched over 50 projects in the final quarter of the year, driving significant growth and innovation.
- Guided a diverse team of five full-stack developers, each at different stages in their careers, fostering a rich collaborative environment.
- Advanced two mid-level developers to senior roles, recognizing their growth and contributions.
Modern WordPress Developer
JS Operating Company LP
- Integrated the Jazz HR Recruitment API, enhancing the recruitment process.
- Collaborated closely with the client's development team to identify and solve challenges within their existing project.
- Maintained close ties with the team, organizing meetings and leading the Recruitment project throughout the development.
Senior Full-stack Developer
Credissimo
- Created fintech products, such as quick loan websites, which significantly boosted loan requests to the company, surpassing 800,000.
- Directed multiple product launches and led creative brainstorming sessions for upgrades with our team of front-end developers and designers.
- Acted as the team leader and senior full-stack web developer and guaranteed efficient project management for fast-processing lending websites.
Senior Full-stack WordPress Developer | R&D Manager
Polarica
- Crafted the back-end and front-end architecture, designed unique gamification features, and developed BI tools for four online casino brands, achieving a user satisfaction rating of 9.5/10 for each.
- Developed bespoke business intelligence tools to monitor player stats and satisfaction, enhancing client communication and managing promotions effectively.
- Collaborated with C-level executives to reality-check and adjust the company's vision, business goals, and growth decisions.
- Led a team of ten, including five remote members in Israel, fostering collaboration and productivity across borders.
- Oversaw interviews and hiring processes for five developers, enriching our team with talented individuals.
Senior WordPress Developer
DevriX
- Developed WordPress eCommerce sites for three clients, with one site quickly attracting over 85,000 active product users post-launch.
- Tracked and resolved project issues, utilizing Asana for seamless task management.
- Led a remote team of developers and marketers to achieve outstanding solutions and results for our clients.
- Created responsive, full-stack websites for four clients, including a web summit and a museum in the United States.
Experience
WordPress Plugin | Instant Breaking News
https://wordpress.org/plugins/instant-breaking-news/WordPress Plugin | Infinite Scroll Random Post
https://wordpress.org/plugins/infinite-scroll-random-post/WordPress Plugin | Chrissy
https://wordpress.org/plugins/chrissy/WordPress Plugin | WP Base Translate
https://wordpress.org/plugins/wp-base-translate/WordPress Plugin | Promotator
https://wordpress.org/plugins/promotator/WordPress Plugin | Checkin
https://wordpress.org/plugins/checkin/WordPress Plugin | AINOW
https://wordpress.org/plugins/ainow/You are writing amazing stories on different themes from the everyday world. But, after a while, there are so many stories that your readers have lost their way to find stories that interest them. Some of them even messaged you about your storyline getting harder and harder to read. In comes the power of the AINOW plugin and machine learning, suggesting the posts that are most relevant to their interests.
WordPress Plugin | BLuR
https://wordpress.org/plugins/blur/WordPress Plugin | Fancy User List
https://wordpress.org/plugins/fancy-user-listing/WordPress Plugin | List Media
https://wordpress.org/plugins/list-media/WordPress Plugin | CPT Lister
https://wordpress.org/plugins/custom-post-type-lister-cpt-lister/WordCamp Utrecht | Speaker
Lightning Pizza | Telegram Bot eCommerce Solution with Bitcoin
I led the back-end development using a fully asynchronous WordPress architecture (Andromeda style), ensuring performance and scalability. The bot integrates tightly with Telegram’s Bot API and connects to a custom WooCommerce set up via PHP, JavaScript, and MySQL. My focus was to deliver a frictionless UX, enable real-time order processing, and handle crypto payment logic securely. This project demonstrates advanced custom plugin development, non-blocking async job queues, and a headless front-end approach for ultra-fast interactions–all wrapped in a playful, viral-friendly product used in crypto communities.
Education
Bachelor's Degree in Computer Science and System Programming
Technological School Electronic Systems (TUES) - Sofia, Bulgaria
Skills
Libraries/APIs
WordPress API, jQuery, jQuery UI, REST APIs, API Development, WooCommerce API, Google Maps, Stripe API, Braintree API, React, Vue, Stripe, Telegram Bot API, Shopify API, OpenAI API
Tools
Atom, Advanced Custom Fields (ACF), Git, GitHub, ACF PRO, Figma, ChatGPT, GitLab, Bitbucket, Adobe Experience Design (XD), Adobe Photoshop, Zoom, Braintree SDK, Google Analytics, Jira, Odoo, Codex
Languages
PHP, JavaScript, SCSS, CSS, HTML, Sass, HTML5, CSS3, SQL, ECMAScript (ES6), PHP 7, TypeScript, Python
Frameworks
Bootstrap, React Native, PhalconPHP, Divi, Bootstrap 3, Laravel
Paradigms
Agile, REST, Object-oriented Programming (OOP), B2B, Responsive Web Design (RWD), API Architecture, Search Engine Optimization (SEO), Web UX Design, UI Design, UX Design, Mobile Design, Mobile UI Design, Management, Automation
Platforms
WordPress, MacOS, Web, Visual Studio Code (VS Code), Windows, Linux, WooCommerce, Zeppelin, Salesforce, Telegram Bot Platform, Ethereum, Joomla, Magento, Shopify
Storage
MySQL, Database Architecture, WP Engine, JSON
Industry Expertise
Project Management, Web Design
Other
WordPress Plugins, Software, Software QA, Software Development, Software Development Management, Software Modeling, Ajax, WordPress Themes, Web Development, APIs, Full-stack, Front-end, Back-end, WordPress Optimization, WordPress Design, User Interface (UI), Responsive UI, Bug Fixes, API Integration, Full-stack Development, Landing Pages, Performance Optimization, WordPress SEO, Third-party Integration, Inventory Management, Core Web Vitals, Responsive Design, WordPress Security, Web Scraping, Back-end Development, IT Consulting, Leadership, Plugins, Figma to WordPress, Optimization, AI Tools, Architecture, Security, Large Language Models (LLMs), AI Model Training, Solution Architecture, API Design, API Testing, Vibe Coding, Artificial Intelligence (AI), Agentic AI, Integration, UI Development, Brand Development, Brand Design, Team Leadership, Remote Team Leadership, Cross-functional Team Leadership, Business Psychology, Stripe Payments, BrainTree, Publishing, Technical Leadership, Google Tag Manager, Site Speed Optimization, Affiliate Programs, Affiliate Marketing, Subscriptions, Elementor, User Experience (UX), Yoast SEO, Membership Sites, SEO Tools, ADA Compliance, Google Analytics 4 (GA4), Data Scraping, Website Data Scraping, AI Adoption, CTO, AI Agents, AI Assistants, AI Chatbots, Payment Gateways, Chrome Extensions, UI Engineering, UI Animation, Digital Marketing, Growth Strategy, Marketing Analytics, Fintech, Finance, Bootstrap 4, Team Management, Telegram Bots, Bitcoin, AI Integration, Content Management Systems (CMS), OpenAI, eCommerce
How to Work with Toptal
Toptal matches you directly with global industry experts from our network in hours—not weeks or months.
Share your needs
Choose your talent
Start your risk-free talent trial
Top talent is in high demand.
Start hiring