Talent badge filter
$30/hr
100% Job Success
$40K+ earned
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Hello and welcome! 👋 I’m a Senior Backend Engineer with over 5 years of experience architecting and developing high-performance, secure, and scalable backend systems. My expertise lies in building modern server-side solutions that power real-world applications - from small startups to enterprise-grade SaaS platforms. 🧠 Tech Stack & Tools 👉 Languages & Frameworks: JavaScript | TypeScript | Node.js | Express.js | Nest.js 👉 Databases: PostgreSQL | MongoDB | Firebase 👉 ORMs: Sequelize | TypeORM 👉 APIs & Communication: REST | GraphQL | WebSockets | RabbitMQ 👉 Cloud & DevOps: AWS (S3, EC2, CloudWatch, IAM) | Docker | CI/CD 👉 Auth & Security: JWT | Auth0 👉 Testing Frameworks: Mocha | Jest 👉 Version Control: GitHub | GitLab | Bitbucket 👉 Task Management: Jira | Trello | ClickUp | Linear Also, I am a part of Incode Group - a global JavaScript and TypeScript development company with over 8 years of experience. So, beyond my backend expertise, I can bring in highly skilled frontend specialists from Incode Group to deliver complete solutions tailored to your project. 🧠 Our frontend expertise: 👉 Languages & Frameworks: JavaScript, TypeScript, ECMAScript 6, React.js, Next.js, React Query, React Storybook, Redux.js, Redux Toolkit, Redux Thunk 👉 UI & Styling: Material UI, TailwindCSS, ShadCN UI, styled-components, SCSS, Sass, Less, HTML5, CSS3 👉 State Management & Forms: Redux Toolkit, Zustand, React Hook Form, custom React hooks 👉 API & Data Handling: Axios, Apollo GraphQL, REST API integration 👉 Data Visualization & Charts: Charts.js, ApexCharts, Highcharts, Recharts, Echarts 👉 Authentication & Backend Integration: Firebase, Auth0, Supabase Together, we can: ✔️ Build fully integrated, end-to-end applications with seamless backend/frontend communication ✔️ Ensure pixel-perfect, responsive UIs that match your designs ✔️ Implement efficient, scalable architectures that allow your product to grow without friction ✔️ Optimize development workflows, combining automation, CI/CD, and testing best practices By working with us, you gain a dedicated, full-stack team capable of handling your project from concept to deployment - delivering quality, speed, and reliability all in one package. 📩 If you’re looking for a backend expert who can deliver robust systems, a frontend developer to create visually appealing user interfaces, or a full-stack team to build your product end-to-end, let’s connect and discuss how we can make your vision a reality - just drop me a message with the project details!
Pavlo V. has worked .
Illya P.
$35/hr
$60K+ earned
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👋 I'm a Senior Full Stack Java Developer with 20+ years of experience building enterprise software, healthcare platforms, fintech solutions, SaaS products, and mobile applications. As a Java Developer I've built high-load backend systems, REST AP payment solutions document processing platforms, and business applications used by thousands of users. As a Full Stack Developer and React Native Developer I've helped startups and growing companies launch scalable products while maintaining security, performance, and compliance. Throughout my career, I've worked with startups, established businesses, and enterprise clients, helping them transform ideas into reliable software products. My experience covers the entire development lifecycle, from architecture planning and technical discovery to development, deployment, optimization, and long-term support. My expertise includes Java Developer Spring Boot React Native AWS PostgreSQL Docker Kubernetes microservices cloud infrastructure and secure software architecture 💪 Full Stack Java Developer Expertise ✔️ 20+ years of Java development 100 successful projects using Java, Spring Boot, Spring Security, Hibernate, and enterprise architectures ✔️ Full Stack Development covering backend architecture database design frontend implementation and React Native mobile applications ✔️ Spring Boot Development, REST API microservices cloud-native applications and high-performance backend systems ✔️ Backend Architecture, distributed systems, 50 third-party integrations, authentication systems, and secure API development ✔️ PostgreSQL MySQL Redis AWS Docker Kubernetes CI/CD performance optimization and legacy system modernization ✔️ Extensive experience designing business-critical applications where scalability, maintainability, security, and long-term growth are key requirements ✔️ Experience integrating payment gateways, healthcare systems, cloud services, identity providers, and external enterprise platforms ✔️ Strong understanding of software architecture, design patterns, clean code principles, and modern development practices ✔️ Experience leading technical initiatives, collaborating with distributed teams, participating in code reviews, and helping businesses make technology decisions 🏥 Healthcare Software Development Expertise As a Senior Java Developer and Full Stack Developer, I've built secure and HIPAA-compliant healthcare software for startups, clinics, and digital health companies. ✔️ 100+ healthcare applications including EHR/EMR systems, telemedicine platforms, patient portals, and engagement solutions ✔️ 80+ FHIR & HL7 integrations for healthcare interoperability and secure data exchange ✔️ 150 React Native healthcare apps with Apple HealthKit, Google Fit, BLE, and real-time health monitoring ✔️ 100+ healthcare features delivered, improving patient engagement and clinical workflows ✔️ 50+ HIPAA-compliant architectures with encrypted storage, audit logging, RBAC, and secure APIs ✔️ 100 Java Spring Boot backend systems with up to 99.9% uptime ✔️150+ healthcare workflow automations, provider portals, appointment management, and patient communication platforms 💳 Fintech Software Development Expertise As a Full Stack Java Developer I've built PCI DSS-compliant fintech platforms focused on payments, identity verification, and transaction security. ✔️ 30+ Stripe, Apple Pay, Google Pay, and 3D Secure (3DS) integrations ✔️ 20+ KYC & AML workflows for onboarding and compliance automation ✔️ 100+ payment features delivered, reducing friction and improving transaction success ✔️ 25+ payment platforms, transaction systems, and financial API integrations ✔️ 15+ PCI DSS architectures with encryption, tokenization, audit logging, and secure authentication ✔️ 50+ financial reporting, payment workflows, transaction monitoring, and compliance solution 🏆 Key Results ✔️ 20+ years of commercial experience as a Full Stack Java Developer ✔️ 100+ enterprise projects across Healthcare, FinTech, SaaS, and AI ✔️ 55+ AI-powered products using OpenAI, Claude API, FastAPI, AI Agents & RAG ✔️ Up to 100% uptime for mission-critical healthcare and fintech systems ✔️ Up to 40% higher patient engagement through digital health solutions ✔️ Up to 25% lower payment decline rates with optimized payment workflows ✔️ Up to 35% faster application performance and scalability improvements ✔️ Up to 90% fewer security vulnerabilities with secure architectures 📌 Core Technologies Java Developer • Spring Boot • Spring Security • React Native • TypeScript • PostgreSQL • MySQL • Redis • Kafka • AWS • Docker • Kubernetes • REST API • Microservices • HIPAA • Stripe 📩 Looking for a technical partner who understands both technology and business goals? I help companies build, scale, and modernize Healthcare Fintech SaaS and Enterprise products using Java Spring Boot Full Stack technologies and React Native If you're looking for more than just code, let's discuss your project and how I can help.
IntelliCeed Inc.
Associated with
IntelliCeed Inc.
$32/hr
$700+ earned
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You’ve probably seen a lot of profiles that start like this: "A full-stack engineer and product-focused problem solver with 7+ years of experience in building reliable, scalable software across industries…” 🥱 💯 Well, that’s true about me! I am proficient in back-end and front-end software development, as well as in UI/UX design, providing the following high-quality services: ✅ Web Application Development: Crafting dynamic, user-centric web applications that captivate and convert. ✅ Custom Software Development: Building intelligent bots, robust desktop apps, and tailor-made solutions. ✅ API Design & Implementation: Creating efficient, scalable APIs that empower seamless data exchange. ✅ Testing & QA: Ensuring software reliability and performance through rigorous quality assurance. ✅ DevOps and Deployment: Streamlining the deployment pipeline for rapid and hassle-free releases. 🥇 But what sets me apart is ID AL. Solutions - a company I co-founded, lead, and am genuinely proud of. 🎯 Why? Because ID AL. Solutions is more than a dev team. We’re partners to individuals, startups, and enterprises, bringing bold ideas to life, from MVPs to complex backends, chatbots, web apps, and AI-integrated systems. We’re obsessed with clean code, a strong ownership mindset, and delivering software that works in the real world. 🦾 We’re your trusted partners. Your tech friends. And since I’m part of it, you can count on me too.
Sviatoslav M.
$25/hr
$0 earned
Available now
Offers consultations
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1️⃣ Full stack developer with 5+ years of experience 2️⃣ Tech lead experience managing developers and product delivery 3️⃣ Website, web app, and platform optimization with up to x100 performance improvements As a full stack developer — and honestly, as a Formula 1 fan too — I naturally care about speed, precision, clean teamwork, fast iteration, and performance under pressure. I approach software development the same way top racing teams approach performance: build a strong system, optimize relentlessly, avoid unnecessary complexity, and make sure everything works reliably when it actually matters. I’m a full stack developer, web developer, and app developer with hands-on experience building web applications, dashboards, AI tools, internal systems, mobile apps, websites, business platforms, and scalable digital products for startups, agencies, and growing companies. My main strength as a full stack developer is taking a product from idea or messy MVP to a stable, production-ready platform using React, Node.js, NestJS, Next.js, and modern development workflows. My expertise as a full stack developer includes: ✅ Turning UI/UX designs from Figma or Adobe XD into responsive, production-ready applications ✅ Building scalable web applications using React, Node.js, NestJS, and Next.js ✅ Creating clean, maintainable interfaces as a React developer focused on usability, speed, and product quality ✅ Working as a web developer to build websites, landing pages, admin panels, dashboards, and business platforms ✅ Developing secure APIs, backend services, databases, and third-party integrations with Node.js and NestJS ✅ Integrating REST and GraphQL endpoints using React, Node.js, Next.js, and NestJS ✅ Building reliable frontend-backend communication as a full stack developer, so products feel smooth and responsive ✅ Optimizing websites, web applications, and mobile apps, including performance improvements up to x100 ✅ Supporting startups and agencies as a full stack developer, web developer, and app developer from planning to launch ✅ Managing developers and product delivery as a tech lead with a practical, product-focused mindset As a full stack developer, I care about the full system, not just one isolated task. I think through architecture, user roles, permissions, dashboards, API structure, data flow, security, performance, deployment, and future scalability. A good web application should not only work today — it should be ready to grow tomorrow without turning into spaghetti with a login screen. 🔧 Tech Stack & Skills: Front-End Development: React, Next.js, Angular Mobile Development: React Native, Expo No-Code / Low-Code Development: Bubble WordPress Development: custom WordPress websites, landing pages, performance optimization, plugin setup Back-End Development: Node.js, NestJS, .NET, Python Full Stack Development: React/Node.js, Next.js/NestJS, Angular/.NET Big Data: MongoDB, ElasticSearch Cloud Computing: Azure, AWS, GCP Deployment & Infrastructure: Docker, CI/CD workflows Recent projects I’ve completed as a full stack developer: 1️⃣ Real Estate Escrows Management SaaS • Sped up the process of closing deals by 7x • Improved brokerage agent productivity by 38% • Increased the number of clients by 73% 2️⃣ Lead Data Management Tool • Made data uploading 50x faster • Helped extract 184M+ data records • Increased marketing campaign performance by 38% 3️⃣ AI-Powered Investment Mobile App • Reduced time spent managing investments by 70% • Reached 3x growth in successful investments compared to manual decision-making 4️⃣ Real Estate AI Mobile App Chatbot • Made property shortlisting 69% faster • Boosted user engagement by 184% As a full stack developer, web developer, and app developer, I can help with MVP development, web application development, platform development, AI tool development, mobile app development, WordPress websites, React applications, Node.js backends, NestJS APIs, API integrations, performance optimization, and long-term technical support. I’m comfortable joining a project early, cleaning up an existing platform, improving performance, or helping a team move from prototype to a stable product. Send me a message, and let's talk! ________________________________________________________________________ As a React developer, I build responsive, maintainable interfaces for SaaS platforms, dashboards, and custom web applications. As a web developer, I focus on performance, usability, and scalable implementation. As a mobile app developer, I create mobile-first products and cross-platform apps with React Native. And as a WordPress developer, I can support various websites, custom front-end implementation, and platform improvements where WordPress is part of the stack.
CodeGeeks Solutions
Associated with
CodeGeeks Solutions
$80K+
earned
$24/hr
100% Job Success
$10K+ earned
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⚡️ Full Stack Development ⚡️ Desktop Software Development 💻 Back-End Development 📜 .NET and C#: 🔹 ASP.NET Core 🔹 Entity Framework Core 🔹 FluentValidation 🔹 MediatR 🔹 Automapper 🔹 FastExpressions 🔹 Serilog 🔹 SignalR 🔹 Identity Framework Core 🔹 BenchmarkDotNet 🔹 xUnit, nUnit, FluentAssertions, NSubstitude, Bogus 🔹 Polly 🔹 Azure DevOps 🔹 Azure services (Virtual Machines, App Services, AKS, Azure SQL, Azure AD, Storage, Networking) 🔹 CI/CD tools and practices (Azure DevOps, GitHub Actions) 🔹 Networking concepts (VNet, NSG, VPN, ExpressRoute) 🔹 Scripting and automation (PowerShell, Azure CLI, Python) 📜 Databases: 🔹 MS SQL 🔹 MySQL 🔹 Postgres 🔹 MongoDB 🔹 Oracle 📜 Architecture: 🔹 DDD 🔹 Event Driven Design 🔹 Clear Architecture 💻 Front-End Development 🚀 Expertise in: 📱 React & React Native (Expo): Building dynamic web and mobile applications 🌐 Modern Frontend Frameworks: Proficient in React, Angular 2+, Vue.js, and Next.js for responsive, scalable web development 🔧 Backend Knowledge: Familiar with PHP (Laravel, Slim, Lumen) and Node.js for basic backend integration 🛒 CMS & E-Commerce: Expertise in WordPress, WooCommerce, Plentymarkets, Magento theme/plugin development, and custom integrations ✨ Clean, Efficient Code: Passionate about writing maintainable and scalable solutions for a smooth user experience 🔗 API Integration: Skilled in SOAP/RESTful API development and integration for seamless client connectivity 💪🏻 The following stack that successfully used: 🔹 SCSS 🔹 CSS 🔹 HTML 🔹 TypeScript 🔹 RXJS 🔹 NGRX 🔹 NextJS 🔹 ReactJS 🔹 REDUX 🔹 SAGA 🔹 Promises 🔹 Server Side Rendering based on NextJS 🔹 NestJS 🔹 MySQL 🔹 ExpressJS 🔹 Plentymarkets ⚡️ PM: 🔹 20+ years of system analysis, application development and programming experience 🔹 Oracle | PL/SQL development, and Project Management experience 🔹 Leading team up to 10 persons 🔹 Ability to meet deadlines 🔹 Strong problem-solving and communication skills 🔹 Strong experience in contact with exacting project stakeholders 🔹 Experience in project estimation, timely realization control, requirements definition, design, architecture, testing and support 🔹 Clear understanding of all stages in software development 🔹 Strong leadership abilities, good communication skills 🔹 Well skilled in Oracle development 🔹 Understanding of people management 🔹 Technology evaluation and business requirements analysis skills 🧠 AI: 🔹 Machine Learning 🔹 Large Language Models (LLM) 🔹 Prompt Engineering 🔹 LangChain 🔹 OpenAI 🔹 Anthropic 🔹 Google GenAI 🔹 FAISS 🔹 Retrieval Augmented Generation (RAG) ⚡️ Database Administration ⚡️ Database Development ⚡️ Solution Architecture 𝙎𝙚𝙖𝙧𝙘𝙝 𝙛𝙤𝙧 𝙢𝙚 𝙪𝙨𝙞𝙣𝙜 𝙩𝙝𝙚𝙨𝙚 𝙠𝙚𝙮𝙬𝙤𝙧𝙙𝙨: C#, ASP.NET Core, .NET Framework, Entity Framework, SQL Server, PostgreSQL, MySQL, REST APIs, JSON, XML, GraphQL, Razor, Blazor, Php, Python, Angular, React, Vue.js, JavaScript, TypeScript, HTML5, CSS3, SCSS, Bootstrap, Tailwind, Azure (App Services, Functions, DevOps, Blob Storage), AWS, Docker, Kubernetes, Microservices, CI/CD, Git, GitHub, GitLab, TDD, xUnit, NUnit, Dapper, Swagger, OAuth, JWT, WebSockets, RabbitMQ, Redis, SignalR, Sitecore, Umbraco, Kentico, DNN, Orchard Core, Contentful, Strapi, ADO.NET, ASP.NET MVC, AngularJS, AJAX, Adobe Photoshop, ASP.NET Web API, Google Analytics, Google Chrome Extension, Ecommerce Website, Browser Extension, Web Application, Website Redesign, API, API Integration, Desktop Application, Website Optimization, Software Debugging, Web Development, Database Development, AI Agent Development, WildFly, Apache HTTP Server, Eclipse Jetty, Microsoft IIS, IBM WebSphere, SQLite, Mimer SQL, Azure Cosmos DB, MongoDB, EC2, ECS, Lambda, S3, RDS, CloudFormation, AWS Backup, IAM, CloudFront, CloudWatch, Laravel, Larvel, Larval, Lavarel, Plentymarkets, iOS, Android, Oracle, PLSQL, PL/SQL, plsql, Anuglar, Angural, Agnural, Angurla, Reatc
Denys P. has worked .
KMteam
Associated with
KMteam
$600K+
earned
Vlad B.
$40/hr
100% Job Success
$70K+ earned
Available now
Offers consultations
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Web developer with over ten years of hands-on experience in delivery, architecture design, and team leadership. Throughout my career, I have implemented solutions for Education, Logistics, Healthcare, e-commerce, and much more, driving business to success. I take ownership of every project I participate in to deliver more value to the end-user. I create custom web applications with: - JavaScript&TypeScript - Node.js, Nw.js, Next.js, Nest.js - Webflow, React.js, Vue.js, AngularJS, Express.js, HTML, CSS, Bootstrap - SQL&NoSQL: Postgres, MongoDB, and SQLite - AWS, Kubernetes, Heroku English - Fluent (IELTS:7.5) I can help you with: - Making educated technical decisions - Streamlining your CI/CD pipeline - Launching your MVP or developing Proof of Concept - Translating your business requirements into code
Vlad B. has worked .
Freshcode
Associated with
Freshcode
$8M+
earned
Yaroslav N.
$40/hr
100% Job Success
$20K+ earned
Available now
Offers consultations
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Launching and growing an elite Shopify brand requires more than just basic setups—it demands a strategic development partner who understands your business goals. While many stores lose revenue to slow speeds and poor UX, I help brands build new custom Shopify stores and continuously optimize existing ones for maximum growth. Let’s partner up to combine data-driven UX strategy, premium design, and high-performance development tailored to your exact business logic. I help global brands stop guessing and start converting. As a professional Full-Cycle Shopify Plus Developer, I work at the intersection of conversion rate optimization (CRO), premium visual design, and clean front-end engineering. I don't just write code—I transform storefronts into scalable, lightning-fast e-commerce assets that turn traffic into profit. 🛠️ FULL-CYCLE E-COMMERCE SERVICES: ➤ The Blueprint (Shopify CRO & Technical Audit) – A deep-dive analysis of your store’s data, mobile responsiveness, and checkout friction points to pinpoint exact revenue leaks and speed drops. ➤ Custom Shopify & Shopify Plus Development: Tailored storefront architecture from scratch, Liquid/JSON coding, Online Store 2.0 migrations, and complex third-party API alignments. Core Web Vitals and Shopify Speed optimization are native to my workflow. ➤ Conversion-Driven UI/UX Design: User-centric, responsive layouts crafted in Figma, entirely focused on intuitive product discovery, lower cart abandonment, and maximizing Average Order Value (AOV). ➤ Full-Stack App Engineering: Building dynamic components and robust custom Shopify applications utilizing React, Vue, Node.js, PHP, and Laravel for advanced server-side logic. ➤ Technical SEO & CRO Performance: Structured data (schema markup), clean semantic code, and mobile-first engineering to ensure your store ranks high on Google and converts organic traffic from day one. ➤ Marketing & Data Automation: Flawless server-side tracking setup, including Facebook Conversions API (CAPI), Google Ads tracking, and automated inventory synchronization pipelines. ➤ Seamless Platform Migrations: Secure, zero-downtime transition of enterprise stores from WooCommerce, WordPress, or Magento to Shopify, preserving 100% of your SEO value. ⚙️ TECH STACK & TOOLKIT: ✔ Design & Strategy: Figma, Adobe XD, Conversion Rate Optimization (CRO), UX Research ✔ E-commerce & Development: Shopify Liquid, JavaScript, TypeScript, React, Next.js, Node.js, PHP, Laravel, Python ✔ Marketing Tech: Klaviyo, Google Search Console, Advanced Tracking APIs 🏆 WHY WORK WITH A DEDICATED FULL-CYCLE EXPERT? 100% Tailored E-commerce: Whether heavily modifying your current Shopify theme or building a bespoke storefront from scratch, every layout, workflow, and custom feature is engineered to eliminate friction, boost user discovery, and maximize conversion rates. Unified Storefront & Backend Architecture: Senior-level UI/UX design and frontend precision seamlessly integrated with robust backend logic. You get a fast, high-converting sales engine built by a single expert, eliminating fragmented agency communication and alignment issues. 👉 Ready to build a premium, high-converting digital asset? Hit the "Invite to Job" button, and let’s maps out your e-commerce strategy on a brief discovery call!
SPLIT Development
Associated with
SPLIT Development
$700K+
earned
$39/hr
100% Job Success
$200K+ earned
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Mobile App Developer with 8+ years building cross-platform apps for iOS and Android. React Native and Flutter are my core - one codebase, two platforms, native-like performance. As a Mobile App Developer I own the whole build: architecture, native integrations and App Store and Google Play launch. ⭐️ 100% Job Success · Top Rated · 6,000+ Upwork hours · React Native Developer · Flutter Developer ⭐️ I've spent 8+ years in Mobile App Development and shipped 50+ commercial apps - SaaS, fintech, AI, Web3, logistics and enterprise. The constant: clients get a working app live in the stores, not a list of reasons it's late. I don't have a favourite framework; I have a favourite outcome - apps that ship and scale. ◆ REACT NATIVE DEVELOPMENT - MY CORE React Native Development is where I'm strongest. I build cross-platform mobile apps with React Native, TypeScript and JavaScript - clean architecture (Redux, Redux Toolkit, Zustand), native modules for iOS and Android, push notifications (FCM, APNs), deep linking, offline-first and real-time features. React Native code that performs like native. ◆ FLUTTER DEVELOPMENT As a Flutter Developer I ship fast, polished cross-platform apps with Flutter and Dart - Bloc, Riverpod, Provider, GetX, clean architecture and MVVM. Flutter development for teams that want one codebase across iOS and Android. ◆ MOBILE APP DEVELOPMENT - FULL CYCLE Mobile App Development from idea to launch - UX, architecture, build, testing and store submission. Native integrations: camera, GPS, Bluetooth, biometrics, OCR, QR scanning, geolocation. Backend and APIs: REST, GraphQL, Firebase (Auth, Firestore, Cloud Functions), WebSocket, Stripe/PayPal/Twilio, plus Node.js, Python and Django services when a project needs them. ◆ AI MOBILE APPS When a project calls for it, I add AI features to mobile apps - ChatGPT/OpenAI and Claude integration, chatbots and AI assistants on iOS and Android. ◆ WHAT I BUILD - Cross-platform mobile apps: React Native and Flutter for iOS and Android, single codebase - SaaS and fintech apps: payments, auth, real-time features, offline-first - AI-powered mobile apps: ChatGPT/OpenAI integration, chat assistants - Logistics, e-commerce and marketplace apps: maps, tracking, real-time data - App modernization and migration: refactoring, performance optimization, native to cross-platform ◆ INDUSTRIES Mobile app development across fintech and payments, healthcare, EdTech, Web3, SaaS, real estate, e-commerce and logistics. ◆ HOW I WORK I communicate early and directly. Roadmap and estimate up front, weekly demos, fast feedback, no surprises. On-time delivery, clean code your next developer won't hate, and support through store launch. ◆ RELATED EXPERTISE Mobile App Developer · mobile app development · React Native Developer · React Native development · Flutter Developer · Flutter development · iOS Developer · Android Developer · cross-platform app development · app developer 📩 Ready to start. Send a few lines about your app and I'll reply as soon as possible with honest thoughts on feasibility, timeline and next steps.
Serhii K.
$34.99/hr
100% Job Success
$400K+ earned
Available now
Offers consultations
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🟢 AVAILABLE TO CHAT Have a complex product idea? I launch high-performing web applications and scalable SaaS platforms without missing deadlines. I am an expert full stack developer building production-grade AI SaaS products now. As an AI developer, I design high-load node.js developer backend infrastructure solutions. With over 12 years of hands-on engineering experience, I focus on moving fast. I have helped clients launch scalable digital web platforms that generated over $10M. My development process follows strict engineering standards. This ensures your software infrastructure scales easily without needing costly architectural rewrites. My engineering stack is deeply focused on robust, production-ready modern web technologies. I act as a nestjs developer to architect scalable modular monoliths and systems. As a next.js developer, I deliver secure frontend applications and TypeScript logic. I am a react developer building responsive user interfaces with strict auth layers. I manage heavy data loads using PostgreSQL, MySQL, AWS cloud, and Redis caching layers. Every application is built with strict client-side and server-side traffic security boundaries. Artificial Intelligence integration is a core part of my current development stack. I am a langchain developer building autonomous agents and context-aware AI applications. As an openai developer, I deploy production-ready rag pipeline developer solutions for clients. My experience covers deep API flows with OpenAI models and Anthropic Claude assistants. I connect complex frontend flows to backend processing via a clean state layer. I handle real-time frame analysis, video pipelines, and voice integrations with Twilio. I operate as a saas developer to resolve heavy backend business logic problems. I implement secure multi-provider payment orchestration, Stripe subscriptions, and tokenized billing flows. My code reliably handles multi-provider routing, external decline codes mapping, and idempotent retries. I ensure stable webhook handling and real-time frontend synchronization under heavy production traffic. You get direct developer-to-client communication without slow, unnecessary project management layers. Why should you hire me as a Full Stack Developer? * I offer 12+ years of expertise as a senior full stack developer. * Shipped a custom ai saas react application from scratch in 6 weeks. * Built 10+ secure next.js developer interfaces tied to robust nestjs backend architectures. * Handled 500K+ enterprise documents inside an optimized pgvector and langchain RAG pipeline. * Reduced onboarding time by 70% while improving infrastructure system performance metrics. * Decreased backend API infrastructure costs by 40% using smart model routing layers. * Completed a 100% seamless payment migration for active customer subscription processing flows. * Managed a technical engineering team of 6 developers during a complex architecture refactoring. * Deployed 20+ production modules including checkout systems and real-time data sync tools. * Successfully delivered 25+ completed software development contracts with a 100% JSS rating. * Created 10+ scalable web application architectures generating maximum business growth for clients. * My technical portfolio contains deep api integration examples. Let's build your scalable MVP or perform a thorough security and performance pass. Send a message or hit Invite to schedule a quick introduction chat.
Serhii K. has worked .
Rezet
Associated with
Rezet
$400K+
earned
$20/hr
90% Job Success
$10K+ earned
Available now
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𝗪𝗢𝗥𝗗𝗣𝗥𝗥𝗘𝗦𝗦 𝗗𝗘𝗩𝗘𝗟𝗢𝗣𝗠𝗘𝗡𝗧 ✅ Setting up the staging development on the dev server or in the client-server ✅ WordPress installation, setup/configuration ✅ Customizing WordPress themes and creating custom functionality according to client's needs and specifications. ✅ PSD, Figma to WordPress conversion (Slice PSDs and convert it into a WordPress website) ✅ Website Design ✅ Manage Website Content ✅ Install new plugins, configure plugins ✅ WordPress updates (themes, plugins, WordPress) ✅ Optimize WordPress speed for faster site load ✅ WordPress integrations ✅ Browser compatibility testing and using bug tracking, project tracking, and SVN software. ✅ Deployment in the production server upon clients' approval of the staging site. ✅ Ensuring high performance and availability, and managing all technical aspects of the CMS 𝗪𝗘𝗕𝗦𝗜𝗧𝗘 𝗠𝗜𝗚𝗥𝗔𝗧𝗜𝗢𝗡 / 𝗗𝗢𝗠𝗔𝗜𝗡 𝗠𝗜𝗚𝗥𝗔𝗧𝗜𝗢𝗡 🔁 Transfer site to WordPress 🔁 WIX to WordPress 🔁 Squarespace to WordPress 🔄 Joomla to WordPress 🔁 Magento to WooCommerce 🔁 Domain and Nameserver admin 🔄 Domain transfers, new domain setup 🛍️ Shopify to WooCommerce 💾 Website Backup 📦 Website Cloning 𝗦𝗘𝗢 🎯 Optimize website for SEO using Yoast SEO or All-in-One SEO 📊 Google Analytics, AdRoll, Conversion tracking, tag manager 🔍 Setup Google Search Console 🔖 Google Tag Manager 𝗪𝗘𝗕𝗦𝗜𝗧𝗘 𝗦𝗘𝗖𝗨𝗥𝗜𝗧𝗬 🔧 Repair WordPress issues 🛡️ Hacked/Malware removal 💻 PHP issues 🔨 Broken WordPress installs 🔒 Setup SSL Certificate 🔥 Advance Security Setup Firewall 𝗪𝗼𝗿𝗱𝗣𝗿𝗲𝘀𝘀 𝗧𝗵𝗲𝗺𝗲𝘀 𝘁𝗵𝗮𝘁 𝗜 𝗵𝗮𝘃𝗲 𝘄𝗼𝗿𝗸𝗲𝗱 𝗼𝗻 𝗽𝗿𝗲𝘃𝗶𝗼𝘂𝘀 𝗮𝗻𝗱 𝗰𝘂𝗿𝗿𝗲𝗻𝘁 𝗽𝗿𝗼𝗷𝗲𝗰𝘁𝘀 ✅ Astra, Divi, Hello, Genesis, Avada, Enfold, Valenti, Bridge, Salient, Thrive Themes 𝗜 𝗵𝗮𝘃𝗲 𝗲𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲 𝗮𝗻𝗱 𝘀𝗸𝗶𝗹𝗹𝗲𝗱 𝘄𝗶𝘁𝗵 𝘁𝗵𝗲 𝗳𝗼𝗹𝗹𝗼𝘄𝗶𝗻𝗴 𝗯𝘂𝗻𝗱𝗹𝗲𝗱 𝗧𝗵𝗲𝗺𝗲 𝗣𝗮𝗴𝗲 𝗕𝘂𝗶𝗹𝗱𝗲𝗿𝘀 𝗹𝗶𝘀𝘁𝗲𝗱 ✅ Elementor Pro, Beaver Builder, Divi, Thrive, Architect, VC - Visual Composer/WPBakery 𝗣𝗼𝗽𝘂𝗹𝗮𝗿 𝗣𝗹𝘂𝗴𝗶𝗻𝘀 𝘁𝗵𝗮𝘁 𝗜 𝗵𝗮𝘃𝗲 𝘂𝘀𝗲𝗱 𝗼𝗻 𝗽𝗿𝗲𝘃𝗶𝗼𝘂𝘀 𝗮𝗻𝗱 𝗰𝘂𝗿𝗿𝗲𝗻𝘁 𝗽𝗿𝗼𝗷𝗲𝗰𝘁𝘀 ✅ LearnDash, Infusionsoft, Memberium, ACF - Advanced Custom Fields Pro, Gauteng blocks, Slider Revolution, Woocommerce, Contact Form 7, MailChimp for WordPress ✅ W3 Total Cache, LiteSpeed, WP Super Cache, WP Fastest Cache, WP Rocket ✅ Gravity Forms, Ninja Forms ✅ Yoast, RankMath, All in One SEO, AMP ✅ WooCommerce, Stripe ✅ All-in-One WP Migration ✅ Mailchimp, WP Mail SMTP, ✅ Sucuri, Limit Login Attempts
Roman S. has worked .
Webtune
Associated with
Webtune
$9K+
earned