Hire the Best Koa Developers
in Ukraine

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Volodymyr S.

Lviv, Ukraine

$20/hr
5.0
27 jobs

JOOMLA, Laravel, php, Wordpress, MySql, Ajax, JQuery - more then 10 years experience. I'm working as Joomla developer since 2008. Throughout this long journey I became expert in developing all Joomla extension types that are efficient, complying with Joomla MVC standards, exactly meeting client and business requirements. My experience enables me to help customers to find the best solution for their problems, also I'm helping them to enhance/modify their requirements and the solution based on existing Joomla features they don't know about yet. Due to the large number of Joomla extensions I have developed, I know exactly how to customize any Joomla extension such that it keeps being update-able ,as much as possible, in case the original developer releases any update in the future, for example I customized joomshopping, Virtuemart, Jomsocial, etc.. Working as a freelancer, I learnt how to guarantee customer satisfaction to build long-term relationships, starting from discussing the project details to meet all the client needs, up-to providing a perfect price along with high quality and prompt support. If you want to achieve your goals and complete your Joomla projects exactly like you wish, you can depend on me.

  • jQuery
  • Web Development
  • HTML
  • PHP
  • JavaScript
  • CSS
  • Joomla
  • MySQL
  • WordPress
  • Laravel
  • GDPR
  • GDPR Compliance Review
  • CMS Development
Andriy K.

Lviv, Ukraine

$35/hr
5.0
73 jobs

Full Stack Developer and technical partner with 10+ years of experience building SaaS platforms, cloud applications, and complex digital products from idea to production. โญ 5.0 client feedback ๐Ÿ† 100+ successful client partnerships ๐Ÿค– AI-enhanced engineering with Claude and modern AI tools ๐Ÿš€ Founder & CEO of Softonix I work with startups, scale-ups, and established businesses that need more than a developer who simply completes tickets. Need one senior technical partner? I can work hands-on. Need more firepower? I can bring in the right engineers from my team while staying directly involved in your project. I help take products from an idea, prototype, or legacy system to a production-ready solution, covering technical planning, architecture, frontend, backend, cloud, integrations, QA, deployment, and ongoing development. โšก WHAT SETS ME APART โ†’ From idea to production I look beyond individual tickets and focus on the product, users, workflows, and business goals behind the code. Before development starts, I help clarify the technical approach, key workflows, risks, and feature priorities so engineering time goes where it creates the most value. โ†’ AI-enhanced development I actively use Claude and modern AI engineering tools to accelerate code analysis, implementation, rapid prototyping, and repetitive development work. The result is faster execution combined with senior technical judgment around architecture, code quality, security, and long-term maintainability. โ†’ End-to-end technical ownership Discovery โ†’ Architecture โ†’ Frontend โ†’ Backend โ†’ APIs โ†’ Cloud โ†’ QA โ†’ Deployment โ†’ Maintenance Whether we're launching a new SaaS product or modernizing an existing platform, I focus on building software that is ready for real users and future growth. ๐Ÿ›  CORE EXPERTISE Frontend: React.js, Next.js, Vue.js, Nuxt, Angular, TypeScript, JavaScript, Tailwind CSS Backend: Node.js, .NET, ASP.NET Core, REST APIs, microservices Cloud & architecture: AWS, Azure, cloud-native applications, SaaS architecture, scalable systems, third-party integrations Mobile: Flutter, React Native, cross-platform mobile applications AI engineering: Claude, LLM integrations, AI APIs, AI-assisted development workflows, AI-enabled SaaS products My hands-on and team experience spans SaaS, analytics, HRTech, marketplaces, AdTech, automotive software, FinTech, e-commerce, and mobile products. ๐Ÿค SOLO WHEN IT FITS. TEAM WHEN IT SCALES. As the Founder & CEO of Softonix, I've helped 100+ clients navigate complex technical challenges while balancing delivery speed, product quality, and development costs. Depending on the project, I can work hands-on or bring in the right engineers from my team while staying directly involved in the technical direction and delivery. You get direct communication and senior technical involvement, with access to experienced frontend, backend, Flutter, React Native, QA, and cloud engineers when the project needs more capacity or specialized expertise. Softonix is your engineering team when you don't have one, and your extra firepower when you do โšก Send me an invite and letโ€™s get started!

  • JavaScript
  • React
  • Node.js
  • Vue.js
  • Python
  • HTML
  • MySQL
  • Tailwind CSS
  • Full-Stack Development
  • Software Development
  • Web Application
  • AI-Generated Code
  • AI Development
  • TypeScript
  • Claude
  • Front-End Development
  • Back-End Development
Vadym C.

Vyshneve, Ukraine

$35/hr
5.0
28 jobs

โšก Available now. Need a Full Stack Developer who actually ships? 11 years, 50+ projects, 100K+ users. Full Stack AI SaaS Developer | Node.js React. I build your product end-to-end and take real ownership. ๐Ÿ† WHAT YOU GET โœ”๏ธ As a full stack developer and node.js developer I have shipped 50+ products with Node.js, React, Next.js, NestJS and TypeScript - from early-stage MVP to scalable SaaS platform with proven track record. โœ”๏ธ As a full stack ai saas developer I build AI-powered products with OpenAI, LangChain, n8n and RAG - AI agents, automation, semantic search. Full stack saasdeveloper ai agents and react ai features. 15+ hours/week saved through practical automation. โœ”๏ธ As a react developer, next.js developer and saas developer I deliver 30+ SPAs and SSR apps with react nextjs, react typescript and react supabase stack. MVP in 4-6 weeks. Full stack developer mern and mern stack experience included. ๐Ÿ”ฅ CLIENT WINS โœ”๏ธ 100K+ users on AI website builder - as a full stack developer ai I built real-time AI content generation, sites created in under 90 seconds. React, Next.js, Node.js, Stripe, AWS. โœ”๏ธ 80K+ users on AI agents platform - as a full stack ai saas developer I shipped multi-channel AI agents with 10+ integrations, saving clients up to 4K per month per agent. โœ”๏ธ 60% faster consulting prep - as a saas developer I built enterprise SaaS with AI-powered process mapping, multi-tenant architecture, RBAC, SSO and 200+ workflows mapped. โœ”๏ธ 70% cut in manual data processing - as a node.js developer I built logistics control tower with 8 API integrations and real-time tracking across 4 providers. โœ”๏ธ 300 req/s during peak traffic, zero downtime - as a back end developer node.js I scaled e-commerce backend and reduced response time from 1.2s to 180ms on 184M+ records database. โœ”๏ธ 38% better campaign performance - as a full stack developer crm I automated lead routing, data sync and CRM workflows with n8n saving 15+ hours/week. โœ”๏ธ 7x faster workflows for clients. 70% continue long-term collaboration. Response under 2 hours. Clear communication, work independently, async remote-first workflows. ๐Ÿš€ WHERE I DELIVER ๐Ÿ“Œ As a saas developer and full stack developer saas I build multi-tenant platforms with RLS, RBAC, role-based access control, SSO, Stripe Connect and payment gateways. Admin dashboards, operations portals and reporting tools. As a full stack developer fintech and full stack developer healthcare I deliver scalable architecture for ongoing and complex project needs that clients build and maintain long-term. ๐Ÿ“Œ As a full stack developer marketplace and full stack developer ecommerce I build vendor management, inventory, commissions, Stripe payments, lead management and CRM integrations. As a full stack developer crm and b2b saas booking system developer I connect systems end-to-end working with existing platform or building from scratch. Gambling platforms, trading systems and custom dashboards with proven track record. ๐Ÿ“Œ As a react developer, next.js developer and front end developer I build with React, Next.js, TypeScript, Tailwind CSS and Firebase. Real-time features with react supabase and next.js supabase, react pwa for performance, react ai capabilities. From figma to react to react developer firebase integrations - nextjs frontend, full stack developer nextjs and web app developer react solutions. ๐Ÿ“Œ As a node.js developer and backend developer I build with Node.js, NestJS, Express.js, PostgreSQL, MongoDB, Redis, Supabase, Firebase and AWS. REST APIs, webhooks, WebSockets. Full stack node.js react architecture, react node integrations and node microservices. Discussing architecture decisions on every project. ๐Ÿ“Œ As a react native developer, react native app developer and mobile app developer I build cross-platform iOS and Android apps from MVP to production. ๐Ÿ“Œ As a web developer, javascript developer, software developer and full stack app developer I work with existing codebase daily. Take ownership, work independently, build and maintain production-ready architecture. Get up to speed quickly. Experience with full stack developer laravel, full stack laravel and wordpress developer for backend integrations and CMS projects when needed. ๐Ÿ”ง React, Next.js, JavaScript, TypeScript, Tailwind CSS, Firebase | Node.js, NestJS, Express.js, REST APIs, WebSockets | PostgreSQL, MySQL, MongoDB, Redis, Supabase, Stripe | React Native | n8n, OpenAI, LangChain | Docker, AWS, Vercel ๐Ÿ“Š RESULTS โœ… 100K+ users on a single platform โœ… 184M+ records, 300 req/s, zero downtime โœ… Response time: 1.2s to 180ms โœ… 15+ hours/week saved through automation โœ… MVPs in 4-6 weeks, 7x faster workflows โœ… 70% long-term clients, response under 2 hours ๐Ÿš€ Looking for a full stack developer or full stack ai saas developer who takes real ownership? ๐Ÿ“ž Share your context - I will come back with structure and next steps

  • Laravel
  • MySQL
  • API
  • API Integration
  • Git
  • Node.js
  • JavaScript
  • React
  • Next.js
  • NestJS
  • HTML
  • CSS
  • Vue.js
  • HTML5
  • Web Application
  • Software Development
  • Full-Stack Development
  • Tailwind CSS
  • Web Design
  • Agile Software Development
Ihor Z.

Vinnitsa, Ukraine

$30/hr
4.7
18 jobs

Greetings! My name is Ihor, and I am a Full-Stack Developer with over 10 years of successful experience in the IT industry. Throughout my career, I have worked on complex web projects, SaaS solutions, and scalable systems for clients worldwide. Bringing together a talented team of equally experienced developers and engineers, I founded WAF Agency. Our mission is to provide high-quality IT solutions that help businesses achieve their goals and improve efficiency. ๐Ÿš€ Technologies We Use: ๐Ÿ”น Frontend: JavaScript โšก HTML5 ๐ŸŽจ CSS3 ๐ŸŽญ React.js ๐Ÿ“ฑ React Native โšก Next.js ๐Ÿ”น Backend: Node.js ๐Ÿ—๏ธ Express.js โš™๏ธ Koa.js ๐Ÿ› ๏ธ Nest.js ๐Ÿ–ฅ๏ธ TypeScript ๐Ÿ”น Databases: MySQL ๐Ÿ’พ PostgreSQL ๐Ÿ›ข๏ธ MongoDB ๐Ÿƒ Firebase ๐Ÿ”ฅ ๐Ÿ”น Cloud & DevOps: AWS โ˜๏ธ Google Cloud ๐ŸŒŽ Azure ๐Ÿ”„ Docker ๐Ÿณ Kubernetes โš™๏ธ CI/CD โšก ๐Ÿ’ก How We Can Help: โœ… Web Applications ๐Ÿ–ฅ๏ธ โ€” Development of complex web projects and corporate portals. โœ… Mobile Applications ๐Ÿ“ฑ โ€” Cross-platform development for iOS and Android using React Native. โœ… SaaS Solutions ๐ŸŒ โ€” Creation of scalable and secure business platforms. โœ… API Integrations ๐Ÿ”— โ€” Development of custom APIs and third-party integrations. โœ… Landing Pages ๐Ÿš€ โ€” High-conversion pages to boost your business growth. โœ… DevOps & Cloud Solutions โ˜๏ธ โ€” Process optimization, CI/CD setup, and cloud system management. โœ… Databases ๐Ÿ’พ โ€” Setup, management, and optimization of all types of databases. โœ… Support & Optimization ๐Ÿ” โ€” Review and improvement of existing solutions. At WAF Agency, we pride ourselves on professionalism and a commitment to delivering outstanding results. Our team of 20+ experts is ready to tackle even the most challenging projects. We value our clients and ensure seamless collaboration, regardless of time zones and language barriers. ๐Ÿ’ก Why clients choose us: - Strong leadership & PMO approach โ€” I personally oversee quality and timelines - Agile & transparent process โ€” weekly demos, clear documentation - Fixed-price or flexible models โ€” whatever fits your project - Fluent English & smooth collaboration - We care about your product like itโ€™s our own ๐Ÿ’ฌ Letโ€™s talk! Contact us to discuss your project, and weโ€™ll help turn your ideas into reality

  • Koa
  • Node.js
  • API Integration
  • PostgreSQL
  • React Bootstrap
  • MeteorJS
  • CSS
  • JavaScript
  • HTML
  • React
  • MongoDB
  • DevOps
  • Next.js
  • NestJS
  • TypeScript
Ihor P.

Kropyvnytskyy, Ukraine

$45/hr
5.0
10 jobs

๐Ÿš€ The Top 3% of Node.js, AI & Backend Engineering Talent on Upwork ๐Ÿค– AI-Native Backend Development for Modern SaaS & Enterprise Products โšก 10+ Years of Professional Experience โšก AI Agents, Chatbots & LLM Integrations Delivered โšก Modern AI Stack: Cursor, Claude Code, GPT-4, Claude Sonnet & Copilot โšก 30โ€“40% Faster Delivery Through AI-Assisted Engineering โšก Trusted by Startups, SaaS Companies & Enterprise Clients Welcome! ๐Ÿ‘‹ I'm a Senior Node.js Developer, Node.js Backend Developer specializing in scalable, secure, and high-performance backend systems. For 10+ years, I've helped companies architect, build, optimize, and modernize SaaS platforms, enterprise applications, fintech products, healthcare solutions, CRM/ERP systems, and marketplace platforms. From Startup MVPs to enterprise ecosystems, I deliver software designed to scale with business growth. ๐Ÿ”ฅ WHAT YOU GET โœ” High-Performance Backend systems engineered to process millions of requests with 99.99% uptime. โœ” Production-ready features delivered 30โ€“40% faster using AI-assisted development and AI-generated code workflows. โœ” End-to-End Developmentโ€”from MVP Development and Product Development to long-term Backend Support and Application Maintenance. โœ” A Dedicated Developer and Technical Lead focused on measurable business outcomes. ๐Ÿ† RESULTS & IMPACT โœ” Delivered SaaS Development initiatives, ecommerce solutions, enterprise applications, and real-time systems serving thousands of users worldwide. โœ” Improved API performance by up to 50% through Backend Optimization, Redis caching, and Database Architecture improvements. โœ” Accelerated release cycles by 30โ€“40% using AI-native engineering practices without sacrificing maintainability. โœ” Built Scalable Backend infrastructures capable of supporting millions of transactions and sustained business growth. ๐Ÿšš WHERE I DELIVER As a Senior Node.js Developer and Backend Engineer, I build REST API and GraphQL API ecosystems using Node.js, Express.js, NestJS, Fastify, Koa.js, JavaScript, TypeScript, WebSocket, Socket, Microservices, and Event-Driven Architecture. As an API Developer and REST API Developer, I deliver API Development, API Integration, Third-Party API Integration, Authentication, Authorization, JWT, OAuth, SSO, Swagger, OpenAPI, and API Documentation for secure enterprise environments. As a Full Stack Developer, I create Web Applications, Ecommerce Websites, Website Redesign projects, Browser Extensions, Google Chrome Extensions, Desktop Applications, Platform Plugins, Headless CMS, CMS Integration, Odoo Development solutions, and End-to-End Development initiatives. As an AI engineering partner, I help companies implement AI Development through AI Agent Development, AI App Development, AI Bots, Chatbots, ChatGPT Integration, OpenAI API integrations, OpenAI Codex Prompt workflows, AI Model Integration, and AI-generated code strategies that improve team productivity by 30โ€“40%. ๐Ÿ’ณ INTEGRATIONS & AUTOMATION โœ” 10+ years integrating Stripe Integration, PayPal Integration, Twilio Integration, SendGrid, shipping providers, Payment Integration services, Webhooks, and System Integration workflows. โœ” Built asynchronous architectures using RabbitMQ, Kafka, BullMQ, Queue Management, and Message Queues to improve throughput and reliability. โœ” Automated Data Processing and ETL pipelines that reduce manual effort and support real-time decision-making. โš’๏ธ TECHNOLOGY ECOSYSTEM โœ” 10+ years of Backend Development using Node.js, Express.js, NestJS, Fastify, JavaScript, TypeScript, Python, PHP, Java, Kotlin, Scala, Ruby, C#, ASP.NET, Django, and modern Software Architecture practices. โœ” 8+ years delivering Full-Stack Development with React, Angular, AngularJS, Vue.js, HTML5, CSS3, Bootstrap, jQuery, Google Analytics, Adobe Photoshop, and Website Optimization strategies. โœ” 10+ years designing Database Development and Database Architecture solutions using MongoDB, PostgreSQL, MySQL, Redis, DynamoDB, Firebase, Supabase, Prisma, TypeORM, Sequelize, Mongoose, Microsoft SQL Server, MariaDB, Oracle, Neo4j, and Azure Cosmos DB. โœ” 7+ years deploying cloud-native applications with Amazon Web Services (AWS), Lambda, EC2, S3, Azure, Google Cloud Platform, Docker, Kubernetes, DevOps, Serverless Architecture, GitHub Actions, Jenkins, Git, and CI/CD pipelines. ๐Ÿค– AI-ASSISTED ENGINEERING STACK โœ” 5+ years leveraging Cursor, GitHub Copilot, Claude Code, OpenAI ChatGPT, GPT-4, and GPT-4o to accelerate prototyping, debugging, testing, and implementation by 30โ€“40%. โœ” While AI accelerates delivery, critical architecture decisions, scalability planning, and Technical Lead responsibilities remain grounded in 10+ years of engineering experience. ๐Ÿค LET'S BUILD SOMETHING GREAT Whether you need a Node.js Developer, Node.js Backend Developer, Backend Engineer, Full-Stack Developer, API specialist, AI integration partner or Technical Lead I'd be happy to discuss your architecture, roadmap, and next steps.

  • Back-End Development
  • TypeScript
  • MongoDB
  • PostgreSQL
  • Elasticsearch
  • Node.js
  • Google Search API
  • Next.js
  • JavaScript
  • App Development
  • NodeJS Framework
  • Web Application
  • Web Development
  • Full-Stack Development
  • Google Cloud Platform
  • ExpressJS
  • Cloud Architecture
  • Solution Architecture
  • AWS Development
  • Websockets
Taras M.

Ivano-Frankivsk, Ukraine

$41/hr
5.0
126 jobs

โค๏ธCLIENT-oriented React Developer available for LONG-TERM projects | ๐Ÿ”ฅ 116 jobs on Upwork and 0 negative feedback | ๐Ÿ’ธ Remote full stack developer with full integration in your team that makes a profit | ๐Ÿšซ No small fixes โ—๏ธ No small fixed price work | To hear me and more about my soft skills, take a look at my video introduction and the video testimonials from my previous clients (attached to the portfolio) ABOUT ME I have more than 8 years of experience building highโ€‘traffic react nextjs applications. I help teams turn complex ideas into profitable React Node.web and React Narive mobile apps, shipping MVPs up to 3x faster using AI. With excellent communication skills and a flexible working attitude, I have successfully collaborated with clients from 23 countries, consistently implementing a โ€œcan-doโ€ approach MY KEY ACHIEVEMENTS โœ” As a React Frontend Developer I developed a React SaaS product that simplified construction estimations, reaching 98% accuracy and reducing project estimation timelines from weeks to minutes. โœ” As a Senior React Developer I led Frontend React Nextjs Project of a global $100M+ enterprise, leveraging React Nextjs frontend Typescript , and Redux โœ” As a Frontend React Developer I worked together with Python Developer to build a high-performance marketplace, handling 500K+ monthly users. I also ensured seamless API integrations, real-time updates, and secure transactions โœ” As a React Developer I worked on Frontend react nextjs of the real-time analytics dashboard also using Redux and D3.js, allowing businesses to track KPIs in real-time and increase operational efficiency by 35% โœ” While working as a React native app developer , I also created a React Native mobile app for real-time event invitations, handling 100K+ active users with 99.8% uptime โœ” Working in the HealthTech industry as a Senior Frontend React Developer JS , I delivered a HIPAA-compliant patient portal on React that cut virtual-visit check-in times from 25 minutes to 8 minutes, serving 40 K weekly sessions โœ” As a React Nextjs Frontend Developer I created a booking system for a company in the hospitality industry, integrating Stripe, Twilio SMS, and calendar syncing, resulting in 95% fewer missed appointments โœ” While working on a LogisticsTech SaaS , I contributed to a Frontend React Development of live shipment tracking system using WebSockets (it works across 4 continents) โœ” In the EdTech sector as a React Nextjs Frontend Developer I developed an interactive React-based learning platform with gamified features, increasing course completion rates by 38% and supporting over 200K concurrent learners โœ” As a Full Stack Developer React Node for a Travel platform, I implemented a dynamic search and booking flow that decreased booking abandonment by 42% and processed $15M+ in monthly reservations โœ” In the Real Estate sector, I developed an interactive 3D model viewer in React, allowing users to explore spaces and products in real time, increasing engagement and conversion rates by 40% โœ” As a Frontend React Developer for a PropTech startup project, I built a property management dashboard that automated 85% of tenant requests, cutting operational costs by $500K annually โœ” In a Media & Entertainment project I worked as Full Stack Developer AI and built and deployed a real-time recommendation engine using deep learning, personalizing video content for 250K+ daily users โœ” For a RetailTech platform, as a full stack developer react node , I developed a customer rewards portal that drove a 60% increase in repeat purchases โœ” Working in InsurTech, python full stack developer and I engineered a policy comparison tool with real-time data feeds, reducing policy selection time from 40 minutes to under 5 minutes for 100K+ users monthly โœ” In the AgriTech industry I worked as Full Stack Developer react node and created a react nextjs frontend dashboard for IoT sensor data, enabling farmers to optimize irrigation schedules and reduce water consumption by 25% across more than 1,500 farms As a Senior React Developer firebase , I not only have extensive experience with various JavaScript frameworks ( I have over 8 years of experience in frontend react development and back-end development, and 5 years in mobile app development ) but also hold Bachelor's degree in Engineering Software. I have built and optimized scalable, high-performance web apps using React.js and have developed React Native mobile applications with lightning-fast performance Need to launch fast? As a Full Stack Developer AI , I can take your MVP from zero to live in 4 weeks, leveraging AI to streamline workflows, cut engineering overhead by 30%, and accelerate your path to seed funding as I have already done it before With me, your next release ships on schedule, scales to hundreds of thousands of users, and lets you focus on growth Let's begin the collaboration with TOP RATED PLUS Full stack Developer React by clicking "Invite" or "Hire" on the top right โ†—๏ธ 07.04.26

  • HTML
  • Node.js
  • React
  • CSS
  • JavaScript
  • CSS 3
  • React Native
  • Angular
  • TypeScript
  • Web Design
  • Redux
  • Front-End Development
  • Vue.js
  • Responsive Design
  • React Bootstrap

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