Full Stack Developer with 10+ years of experience building WordPress websites, WooCommerce stores, membership platforms, and custom web applications.
I've worked with businesses from the US, Canada, the UK, and across Europe, helping them build new websites, improve existing ones, fix complex technical issues, and create solutions that support business growth.
My WordPress experience includes custom theme and plugin development, WooCommerce, membership websites, API integrations, performance optimization, custom functionality, and ongoing maintenance. I enjoy working on projects that go beyond basic page builders and require custom solutions.
Alongside WordPress, I also build modern web applications using React, Next.js, TypeScript, Node.js, and PostgreSQL. This allows me to handle everything from front-end development to custom APIs, integrations, dashboards, and backend systems when projects require more than a traditional website.
I'm comfortable working with existing codebases, fixing bugs, improving performance, and turning complex requirements into clean, maintainable solutions.
I focus on practical solutions that work in production, communicate clearly, and deliver work that clients can confidently build on in the future.
WordPress
WordPress Plugin
PHP
Responsive Design
Web Development
HTML5
CSS 3
JavaScript
WooCommerce
MySQL
Theme Development
jQuery
Bootstrap
Git
Mario A.
Zepce, Bosnia and Herzegovina
$30/hr
5.0
36 jobs
Senior Unity developer — 7+ years, 15+ shipped titles, 30 completed Upwork jobs. I specialize in multiplayer networking (Photon Quantum, Photon Fusion 2, Mirror, Unity Netcode for GameObjects) and shipping games all the way to Steam, Google Play and the App Store.
Most Unity devs avoid networking. It's what I do best.
WHAT I DO
- Multiplayer & Netcode — Photon Quantum (deterministic rollback), Photon Fusion 2, PUN2, Mirror, Unity Netcode for GameObjects. Prediction, lag compensation, desync debugging, matchmaking, lobbies, and dedicated server deployment with Edgegap.
- Enemy AI & Boss Combat — behaviour-tree AI, multi-phase boss encounters, ability systems, and networking them so every player sees the same fight.
- Gameplay Systems — character controllers, combat, abilities, state machines, modular architecture that stays maintainable.
- RPG & Progression — inventory, quests, dialogue, turn-based and grid combat, stats, save/load.
- Performance & Stability — profiling-led optimization, Android ANR/crash fixing, memory and frame-rate work.
- Monetization — Unity Ads, AdMob, ironSource LevelPlay, IAP.
- Full-Cycle Delivery — prototype to published build on Steam, Google Play and the App Store.
Across 7 years I've delivered 50+ projects in total — 15+ of those are shipped, commercially released titles; the rest are prototypes, contract systems built inside other studios' games, and R&D work.
SELECTED WORK
- Ardent: Rise (Steam) — 5-player co-op action RPG. Built all enemy AI and every boss encounter, including multi-phase boss fights, phase transitions and boss ability sets, and networked the entire combat layer (Unity Netcode for GameObjects).
- Soul Fighters — rollback-safe online combat for a competitive 2D fighting game on Photon Quantum 2.
- SurfPunk — enemy AI for an IGN-featured online action RPG (Photon Quantum 2).
- Plush Fight League — PvP brawler netcode on Photon Quantum.
- Riviera: The Promised Land — shipped to Steam and Nintendo Switch.
- Blood of Yamin (Steam) — gameplay, NPC AI, dialogue and quest systems for an action-RPG metroidvania.
- Who Needs a Hero (Google Play) — enemy AI, inventory and core gameplay. 100k+ downloads.
- Lost in Pace — solo-developed physics-based multiplayer racing game (Photon PUN2).
- Snek Tournament — multiplayer arcade game with online tournaments, leaderboards and a server-backed economy.
HOW I WORK
Clear milestones, playable builds you can test at each step, and honest timelines. If something won't work, I'll tell you before you spend money on it — not after.
Tell me what you're building and what's blocking you. I'll come back with a realistic approach, scope and timeline.
C#
C++
Game Development
Casual Game
Unity
Photon Unity Networking
Steam API
Steam
Performance Optimization
Game Development Bug Fix
Web Design
Game Engine
.NET Framework
RPG Development
Game Design
Online Multiplayer
Multiplayer
Mobile Game Development
Quantum Physics
Senka I.
Sarajevo, Bosnia and Herzegovina
$115/hr
5.0
54 jobs
I'm an analytics, CRO, and AI-powered growth systems strategist with 12 years of experience turning websites and marketing stacks into fast, compliant, data-driven platforms. Over the past 8 years I've partnered with agencies and enterprise clients to lead CRO programs, A/B testing roadmaps, analytics infrastructure, technical SEO, and AI-driven automation, including recovering 70%+ of GA4 event data lost to a broken consent configuration, auditing 800+ pages for legal compliance under an active WAF, and building the schema and structured-data foundations that get brands cited by AI answer engines like ChatGPT, Claude, and Google AI Overviews.
CRO & A/B Testing Strategy
- Website audits & reports, CRO process implementation and optimization, CRO SOPs
- Platforms: VWO, Optimizely, Convert, Google Optimize
- Hypothesis-driven testing & test prioritization
- Landing page and funnel optimization
- Scrollmaps, clickmaps, session replays (e.g. Hotjar, Clarity)
- Statistical confidence reporting & experiment insights
Analytics & Tagging Infrastructure
- GA4 advanced configurations & eCommerce tracking
- Google Tag Manager (GTM) custom events, data layers, variables
- Consent management: Google Consent Mode v2, OneTrust/CMP integration, GDPR/CCPA-compliant tagging
- Cross-domain tracking & event-based goal setup
- Funnel and journey mapping for B2B and D2C
- Reporting dashboards in Looker Studio or GA4 Explorations, plus custom dashboard applications built for specific corporate/agency clients (e.g., multi-tenant reporting tools pulling live data from Meta, Google, and LinkedIn APIs)
Technical SEO & AI Search Visibility (GEO)
- Full-site crawls and audits at scale (Screaming Frog, log file analysis)
- Schema markup & structured data for traditional SEO and for AI answer engines — helping brands get cited by ChatGPT, Claude, and Google AI Overviews
- Site migrations, thin-content and duplicate-content remediation
- Legal/regulatory content audits across large page sets
AI, Automation & CRM Integrations
- n8n & Zapier: custom multi-step workflow automation across marketing, CRM, and hosting/infra tools
- AI-powered workflows: integrating LLM APIs (Claude, OpenAI) into automations for content generation, data tagging, and reporting
- Building AI agent and RAG systems (FastAPI, vector and graph databases) for structured data retrieval
- Zoho CRM: form mapping, lead tagging, attribution
- HubSpot: behavior-based segmentation, automated workflows
- CallTrackingMetrics: UTM + session data → call source attribution
- GoHighLevel: SMS campaigns, pipeline tracking, lead nurturing
Custom WordPress Development
- Gutenberg + ACF custom blocks
- Themes & plugin architecture, including custom MU-plugins
- WooCommerce performance & checkout optimization
- Accessibility, Core Web Vitals, and security best practices
I engineer systems that convert and hold up under scrutiny - from AI-powered automation and airtight analytics to compliance-ready technical SEO and AI search visibility. My work bridges marketing goals, technical execution, and now AI visibility, whether that means launching a multi-variant test, automating a process that used to eat hours every week, or making sure a brand gets cited by the AI engines shaping how people find businesses today.
WordPress is one of the platforms I know inside and out after 12 years, but the systems I build now go well beyond it.
WordPress
Google Analytics 4
A/B Testing
Front-End Development
Conversion Rate Optimization
JavaScript
AI Bot
AI Chatbot
Automated Workflow
Google Tag Manager
n8n
Generative AI
LLM Prompt Engineering
AI Agent Development
Compliance
GDPR Compliance Review
Compliance Testing
IT Compliance Audit
Governance, Risk Management & Compliance
React
Ervin H.
Srebrenik, Bosnia and Herzegovina
$25/hr
4.1
18 jobs
I'm a Full Stack Developer with 4 years of experience in building high-performance web applications. My work spans React, Angular, .NET, and Node.js, focusing on creating scalable, user-friendly solutions. My Upwork projects and past roles confirm my dedication to clean code, performance optimization, and seamless user experiences.
My services include:
👉 Custom Web Development – Crafting fast, scalable, and secure applications tailored to client needs.
👉 Frontend Excellence – Designing intuitive, responsive UIs with React and Angular.
👉 Backend Development – Building robust APIs and scalable architectures with .NET, Node.js, and MongoDB.
👉 Code Optimization & Refactoring – Improving performance and maintainability in existing applications.
What sets me apart is my commitment to efficient solutions and proactive communication. I ensure clean, maintainable code and always stay up-to-date with industry best practices.
What you'll get:
✅ Scalable & Maintainable Code 🏗️
✅ SEO-Optimized, Responsive Designs 🚀
✅ Performance-Driven Architecture ⚡
✅ Cross-Browser Compatibility 🌍
✅ Ongoing Support & Maintenance 🔧
My Core Expertise:
WordPress, React.js, Angular, .NET, Node.js, MongoDB, SQL, Firebase, AWS, Azure
📌 Check out my work: github.com/ervin-machine
If you're looking for a developer who delivers high-quality solutions with a focus on scalability and user experience, let’s connect and bring your ideas to life!
WordPress
SQL
HTML
.NET Framework
Front-End Development
Angular
CSS
JavaScript
Node.js
React
PostgreSQL
Oracle
C#
Aid D.
Sarajevo, Bosnia and Herzegovina
$15/hr
5.0
26 jobs
WordPress Developer & assistant with 5+ years of experience helping agencies and businesses build, maintain, and improve WordPress websites.
I specialize in custom WordPress development, page builder implementations, website maintenance, Woocommerce and ongoing technical support. I work with agencies that need a reliable WordPress partner who can handle new builds, client updates, troubleshooting, and long-term website management.
My experience includes building production-ready WordPress websites from Figma designs, developing custom themes, working with Elementor and other page builders, and improving existing websites without disrupting their structure.
I can help with:
✅ WordPress website development from scratch
✅ Custom WordPress theme development
✅ Elementor, Bricks Builder and Gutenberg implementations
✅ Figma / Adobe XD to WordPress conversion
✅ Website maintenance and ongoing support
✅ Bug fixing and troubleshooting
✅ Content updates and landing page creation
✅ Theme and plugin customization
✅ WooCommerce setup and customization
✅ Performance optimization and Core Web Vitals improvements
✅ Website migrations, hosting setup and deployment
✅ ACF-based dynamic content solutions
For custom theme projects, I focus on clean architecture, reusable components, and flexible content management. Using tools like ACF, I create websites where clients can easily manage content while keeping the design structure stable and consistent.
I am also comfortable taking over existing WordPress projects, understanding unfamiliar codebases, fixing issues, improving performance, and helping agencies deliver projects faster.
Why work with me:
• 6+ years of WordPress development experience
• Strong understanding of both custom development and page builder workflows
• Fast and reliable execution for ongoing agency needs
• Experience working with existing websites and legacy setups
• Clear communication and long-term collaboration mindset
If you need a dependable WordPress developer for website builds, maintenance, support, or ongoing client work, I can help.
WordPress
Website Customization
Landing Page
Elementor
WordPress Website
WordPress e-Commerce
PHP
JavaScript
CSS
HTML
React
Node.js
ExpressJS
Divi
CMS Development
Stefan U.
Banja Luka, Bosnia and Herzegovina
$30/hr
5.0
7 jobs
Are you looking for a reliable and skilled WordPress developer to bring your vision to life? Look no further! With over 7 years of experience, I specialize in creating custom WordPress websites that are not only visually stunning but also highly functional.
From the moment we start working together, my goal is to understand your unique needs and deliver a website that truly reflects your brand. My expertise in PHP, HTML, CSS, JavaScript, and MySQL enables me to build robust and scalable solutions tailored specifically for you.
Here’s what you can expect when you work with me:
◉ Efficient Development: I work quickly and efficiently to ensure your project is completed on time and within budget, without compromising on quality.
◉ Exceptional Communication: I believe that great communication is the key to a successful project. I’m always available to provide updates, answer questions, and make sure we’re on the same page.
◉ Custom Solutions: No two projects are the same. I take the time to understand your specific needs and develop custom solutions that are perfect for your business.
◉ Elementor Proficiency: As an Elementor expert, I can create professional-grade websites with drag-and-drop simplicity, making it easy for you to manage and update your content.
◉ Ongoing Support: My commitment to your success doesn’t end when the project is completed. I offer ongoing support to ensure your website continues to run smoothly and effectively.
Let’s work together to create a website that not only meets your expectations but exceeds them. I’m dedicated to delivering exceptional results and helping your business grow.
WordPress
PSD to WordPress
Bootstrap
HTML5
CSS
HTML
Elementor
Tailwind CSS
Laravel
JavaScript
SEO Audit
PHP
Figma
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