🚀 AI Solutions for Scalable Impact — LLMs, RAG, LangChain, and Full-Stack Development 👋 Hi, I’m Serhii - representing Springs, a Canada, Portugal & Ukraine-based AI & ML development agency with 15+ years of experience delivering enterprise-grade AI systems that turn complex ideas into scalable, secure products. We combine Generative AI, Large Language Models (LLMs), Retrieval-Augmented Generation (RAG), and custom software engineering to help businesses innovate faster and smarter. Services: 🧠 AI/ML Solutions — GPT-4, LLaMA, Mistral, Claude, Gemini 🔍 Discovery & Technical Consultancy 💻 Web & Mobile Development with AI integration ⚙️ DevOps & Cloud Scaling 🔒 Security-First Development & QA 🛠 Ongoing Support & Maintenance 🏢 Industries: Artificial Intelligence | Computer Vision | FinTech | Education | Logistics & Transportation | Retail | Real Estate | Sales & Marketing 🛠 Tech Stack: Python (Django, FastAPI, Pandas), PyTorch, TensorFlow, Keras, LangChain, Pinecone, ChromaDB, Vector Databases, OpenAI API, GPT-4o, n8n, MERN/MEAN, React, Vue, Angular, AWS, Docker, Kubernetes, PostgreSQL, MongoDB 💡 Why Springs? 🔷 Transparent partnerships — honesty first 📋 Deep Discovery Phase to ensure clarity 🛡 Standardized security best practices ✅ Proven enterprise delivery track record

I help premium brands rebuild and scale their websites without losing SEO or performance. With over 10 years of experience as a CTO leading distributed teams in Ukraine and Poland, I deliver pixel‑perfect WordPress, Next.js, and AI‑accelerated solutions that combine design precision with technical depth. My builds consistently achieve 90+ PageSpeed scores, preserve 100% of existing SEO rankings, and integrate advanced workflows powered by AI tools like Cursor and Claude Design. Whether it’s a luxury brand redesign, a headless WordPress migration, or a performance‑oriented Shopify alternative, I ensure your site remains fast, secure, and future‑proof. What I deliver: • SEO‑safe redesigns with clean 301 redirects, schema markup, and Core Web Vitals compliance • Lightning‑fast, scalable architectures using WordPress + Next.js • Pixel‑perfect UI/UX implementation with multilingual support • Secure payment integrations (Stripe, PayPal, Apple Pay, Google Pay) • Server optimization across AWS, Hetzner, and DigitalOcean If you’re looking for a partner who combines technical mastery with design sensitivity, and who can guarantee measurable outcomes - let’s build something extraordinary together.

Product & Project Manager at RGB Web Studio with over 10 years of experience in digital projects. My key role is to connect business goals 🎯, users, and the team so that the website, online store, or product is launched on time, without chaos, and with predictable results. I am responsible for process management, project structure, requirements, communication, and quality control at all stages ✅. I work with both new projects and existing products that need redesign, development, or scaling. RGB Web Studio consistently receives 5⭐ reviews on Clutch and Google, which confirms the quality of our work and our long-term relationships with clients. ┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄ Services: from concept to comprehensive implementation Full cycle of work: from concept and analytics to design, development, launch, and further project development. 🏢 Creation of clear corporate websites We help reveal the brand, competently present services, and build trust through a well-thought-out structure, UX, and modern design. 🛒 Development of online stores (eCommerce) We create turnkey online stores: catalog, product cards, shopping cart, order placement, payment, integrations, and a convenient user journey. 🚀 Development of modern landing pages Effective and visually appealing landing pages for lead generation, advertising campaigns, and promotion of products and services. 💻 Development of web services, SaaS products, and mobile applications We create innovative solutions that optimize and accelerate business processes. 🎨 Redesign of websites, landing pages, and online stores We improve the user experience, structure, and visual perception of existing projects. 📄 Visual and technical specifications We develop detailed technical specifications that reduce risks, define requirements, and simplify the development process. 🔍 Website audit We conduct comprehensive UX, visual-semantic, and technical analysis to improve the usability, conversion, and effectiveness of the website. ┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄ 🏆 Industry: 🔸 Fintech: Interfaces for financial services: transfers, balances, transactions, cards, accounting 🔸 Healthcare: Digital offices, trackers, appointment scheduling, performance analysis 🔸 SportsTech: Platforms for sports analysts, managers, scouts 🔸 EdTech SaaS: Educational platforms where design makes learning convenient and understandable 🔸 Startup: A young, fast-growing company that tests new ideas and creates innovations 🔸 AI: Data-driven products: dashboards, AI features, automated reports 🔸 Crypto & Web3: Wallets, NFT marketplaces, charts, token analytics, DeFi products 🔸 Logistics: Systems for tracking cargo, transport accounting, document management, and driver management ┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄ Our technology stack: 📌 Back-end: PHP (Laravel), Node.js (Nest.js) 📌 DevOps: Docker, Dokploy, Linux, S3 📌 Front-end: React.js, Next.js, Vue.js, Nuxt.js, HTML5, CSS3, Tailwind CSS, shadcn/ui, TanStack Query, zustand 📌 UX/UI: Figma, Adobe Creative Cloud, target audience research, prototyping 📌 Databases: MySQL, PostgreSQL, MongoDB 📌 CMS / eCommerce: WordPress, WooCommerce, Elementor, Strapi 📌 Optimization: technical audit, semantic content analysis, author supervision ┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄ Why choose us: ✅ 10 years of practical experience in website development ✅ Transparent process — from briefing to post-launch support ✅ Intuitive structure, modern UI, and strong UX logic ✅ Reputation confirmed by Clutch 4.9 and Google 5.0 Let's create a clear and modern web project together Contact us in a way that is convenient for you and receive a detailed and clear proposal

Hi! My name is Andrii, I am a skilled Full-Stack Developer with 8 years of experience, ready to transform your digital concepts into reality. With a holistic approach to web development, I'm passionate about creating seamless, user-friendly experiences that make a lasting impact. My toolkit encompasses a wide array of skills: 📌JavaScript/TypeScript 📌Node.js 📌Nest.js 📌React.js 📌 Python 📌Angular I have experience with several popular frameworks, which allows me to choose the best tool for creating a high-quality user interface according to your needs. Moreover, I am good at working in a team and appreciate the exchange of knowledge, but I am also able to independently solve problems and look for new solutions to improve the quality of work. 💪 More about my skills that will help us achieve the best result: ✅ React.js, Angular, Nest.js, Express, TypeORM, Redux (toolkit/hook forms), JSX, MUI, Bootstrap, AntDesign; ✅ SQL; ✅ WebSokets; ✅ NoSQL - MongoDB, Firebase; ✅ HTML, CSS, LESS, Sass; ✅ SQLite, MySQL, PostgreSQL; ✅ AWS, Azure; ✅ Git, GitHub, GitLab ✅ Agile, Scrum, Kanban, Waterfall, Pair Programming, Feature Driven; Teamwork and Communication 🤝 Collaborative Spirit: Believing in the power of effective teamwork. Clear Communication: Open lines of communication are essential for project success. Adaptability 💼 Staying Ahead: In the dynamic world of web development, staying current with the latest trends and technologies. Problem-Solving: Tackling challenges head-on to keep projects on course. I'm dedicated to turning your web development dreams into reality, all while maintaining a friendly and results-driven approach. Let's embark on this exciting web development journey together! If this sounds like a fit for you, I’d love to chat – invite me to interview and grab some time.

I'm a Full-stack Web Developer who’s working with the up-to-date and most effective technologies. I specialize in JavaScript plus frameworks/libraries based on this language. To ensure the highest quality standards, I tend to adhere to best coding practices. My technology stack: - JavaScript/TypeScript - React v18, Next.js - Redux-Toolkit, MobX, Jotai, Zustand - React Query, SWR - Vue 3, Vue-router, Pinia, vee-validate - MUI/React-bootstrap - HTML/CSS/SCSS - Node.js - Express.js - Sequelize - PostgreSQL Text me right away so we can discuss everything and start work immediately.

Top 1% Upwork EXPERT-VETTED Data & Solution Architect. For over 15 years, I've worked with data, focusing the last 7 years as a Data Architect on managing high-load and big-data projects. I oversee systems that serve hundreds of millions of users and manage petabytes of data, along with overseeing infrastructure budgets of over 1.5 million USD each year. In the past 8 years on Upwork, I have completed more than 100 projects with a 100% Job Success Score and a 94%+ client return rate. SERVICES ✅ Data Engineering ✅ AI/ML ✅ AI Adoption & GenAI ✅ Predictive analytics ✅ High-load Data Scraping ✅ Data Integration - seamless connection through APIs ✅ Data Management – ETL pipelines, Data Warehousing, Data Lakes, DataOps ✅ IT Infrastructure & Solution Architecture ✅ DevOps for Performance Optimization and Cost Reduction STACK & TECHNOLOGIES Core stack: Python Data Warehousing: Redshift | BigQuery | Snowflake | Teradata Data Lakes: Hadoop | Amazon S3 | Azure Data Lake Storage | Google Cloud Storage ETL Tools and Data Pipelines: Databricks Workflows | AWS Glue | Google Cloud Dataflow Big Data Processing: Spark | Hadoop | Google Dataflow | Dask | Amazon Kinesis | Kafka Databases: MySQL | PostgreSQL | Google BigQuery | MongoDB | DynamoDB | Redis Data Analysis and Machine Learning: Pandas | NumPy | Dask | SciPy | OpenCV | TensorFlow | PyTorch | Scikit-learn | XGBoost | Keras | spaCy GenAI: OpenAI GPT-3 | GPT-4 | Lama 2 | Llava | Bard | Mistral | Anthropic Visualization Tools and Libraries: Power BI | Looker | Quicksight | Grafana | Plotly | D3.js | Dash | Matplotlib DevOps and DataOps AWS | GCP | Azure | Docker | Kubernetes | Amazon ECS | Jenkins | GitLab CI/CD | GitHub CI/CD | Bitbucket Pipelines | Ansible | Terraform | CloudFormation | Prometheus | Grafana | Datadog | Zabbix | ELK Stack | Elasticsearch | Logstash | Kibana | Graylog Web Development Front-End: React.js | Redux | Redux-Saga Back-End: Python | Django Rest Framework | Flask We use the Agile approach to ensure great products delivery. As our benefits, we provide the guarantee, NDA signing, and post-service for delivered products. Want to work together? I’d love to hear from you!

Are you building a standard web application, or an intelligent business platform? In today's market, "clean code" is the bare minimum. You need a system that is secure, scalable, and capable of leveraging modern AI to automate your business logic. I am not just a coder; I am a Solutions Architect with over 11 years of experience. I bridge the gap between robust, enterprise-grade engineering (PHP/Laravel/Symfony) and the new world of AI integration. While junior developers rely on AI to write their code, I use my deep architectural expertise to build secure AI agents and workflows directly into your application. I specialize in helping founders and SMEs transition from "legacy" web apps to intelligent, automated platforms without rewriting everything from scratch. How I Help You Win: - AI-Powered SaaS Architecture: I build platforms where AI isn't a gimmick. It’s a core feature. From intelligent admin dashboards (FilamentPHP) to custom RAG (Retrieval-Augmented Generation) systems that "talk" to your database. - Enterprise Reliability: I bring a senior engineer’s discipline to development. I write strict types, optimize complex SQL queries for speed, and ensure your data remains secure—things that "no-code" tools cannot do. - MVP Acceleration: Using modern stacks (TALL stack, Filament, Livewire), I can deliver production-ready MVPs in weeks, not months, allowing you to secure funding or revenue faster. Technical Stack & Expertise: - 🚀 AI & Automation Integration - LLM Integration: OpenAI, Anthropic (Claude), and open-source models. - Intelligent Workflows: Building custom agents that automate data entry, categorization, and content generation. - RAG Implementation: Connecting your private business data to AI safely. backend Backend & Architecture (The Core) - Languages: PHP 8.x, SQL (MySQL/MariaDB). - Frameworks: Laravel (Expert), Symfony, Slim. - Admin Panels: FilamentPHP. Rapidly building internal tools and customer portals. - Database: Complex SQL optimization, Schema Design, Migration strategies. frontend Frontend & UX -Modern Stack: Livewire, Alpine.js, Tailwind CSS (The "TALL" Stack). - JS Frameworks: Vue.js, React (for specific reactive components). 🛠 DevOps & Quality Assurance - Infrastructure: Docker, CI/CD Pipelines (GitHub Actions), Heroku. - Testing: PHPUnit, Pest, Static Analysis (PHPStan). I ensure the code works before you ever see it. Why Work With Me? I have been a Founder & CEO, a CTO, and a Lead Developer. I understand that you aren't paying for code; you are paying for a business result. I communicate clearly, I work autonomously, and I treat your budget with the same respect I treat my own. Ready to upgrade your technology? Click the green "Invite to Job" button. Let’s discuss how we can build a system that works as hard as you do.

🚀 Senior fullstack engineer with 5+ years building production web and mobile apps, AI-powered workflows, GTM systems, and operational infrastructure in Next.js, React, and Node — including AI features powered by Claude and OpenAI. I ship clean, fast, well-tested products from zero to deploy and stay on to make them better. ✅ Top Rated · 100% Job Success · 5★ on every completed contract · EU timezone 🛠 What I build: • Web apps in Next.js / React with TypeScript, Tailwind, and ShadCN for SaaS, AI, CRM, and GTM platforms • Mobile apps in React Native + Expo (sharing logic with the web) • APIs and backend services in Node, Nest.js, and Express • CRM integrations, webhook systems, and API orchestration for GTM workflows • HighLevel (GHL) API integrations, automations, custom workflows, and lead-management systems • AI-powered outbound workflows, operational automation, and internal tooling • Data layers in PostgreSQL, GraphQL, Redis, Prisma, and TypeORM • AI features inside production apps, business workflows, and operational automation — Claude, ChatGPT, OpenAI, automation • End-to-end delivery: architecture → implementation → deployment → monitoring on Vercel • Consultation on AI workflows, product architecture, API integrations, and scalable operational systems 🤖 AI & agent engineering: • LLM app development (Claude, OpenAI, Anthropic API) • Prompt design, tool-calling, and GTM automation workflows • AI-powered sales, CRM, onboarding, and support automations • Agent orchestration, outbound automation, and multi-step business workflows • Retrieval-augmented generation (RAG), embeddings, vector search, and memory design • Evaluation pipelines, guardrails, observability, and production safety • AI consulting for startups building AI-native products and automation systems • OpenClaw: agent configuration, skill development in JS/TS, sandbox & tool permission design, multi-channel bot deployment, model/provider configuration 🧱 Recent work: • Built a multi-app Nx monorepo with interconnected web and mobile apps • Designed and shipped tool-calling AI agents on OpenClaw with custom skills, sandboxed tool permissions, and multi-channel deployment • Built API-driven CRM automations and operational workflows for startup teams • Integrated third-party APIs, webhook pipelines, and automation systems across SaaS products • Built an AI blog generator that writes posts and auto-publishes to a CMS • Implemented a RAG pipeline with retrieval, memory, embeddings, and evaluation guardrails for a production AI feature • Built AI-assisted automation workflows and operational systems for startup teams • Fixed a tricky React Native Expo image-flashing bug other devs had stalled on • Shipped an interactive healthcare CRM for managing doctor schedules • Contributed to a complex EU marketplace for buying and selling businesses • Built a reusable admin-page and internal tooling library powering multiple client products • Refactored open-source canvas npm packages to add custom shapes • Cut visual bugs 3× by introducing visual regression testing in CI ⚙️ Stack Frontend: React · Next.js · TypeScript · Tailwind · ShadCN · Vue State: Zustand · Redux · MobX Mobile: React Native · Expo Backend: Node · Nest.js · Express · GraphQL · REST APIs · Webhooks Data: PostgreSQL · Redis · Prisma · TypeORM · Vector Databases AI & Agents: Claude · Claude Code · OpenAI API · ChatGPT · OpenClaw · LLM apps · Tool calling · RAG · Embeddings · Agent orchestration · Evals & guardrails · Automation · AI workflows CRM & GTM: HighLevel (GHL) · CRM Automation · GTM Engineering · Revenue Automation · Sales Automation · Lead Workflows · API Integrations · Operational Systems · Growth Systems · AI Consulting DevOps: Vercel · GitHub Actions · Sentry · Datadog Tooling: Vite · Storybook · Penpot · Neovim · Apache Superset · Conductor · OpenClaw 👤 How I work Detail-oriented, async-friendly, EU timezone, English C1. I write code I'd be happy to maintain a year later, ship on schedule, and reply within hours. I also use modern AI dev tools (Claude Code, ChatGPT) to move faster without cutting corners on quality. 💪 Key strengths • Senior expertise in Next.js, React, Nest.js, API architecture, and scalable GTM systems • Strong experience integrating CRMs, APIs, automation workflows, and operational tooling • Web + mobile from one engineer (React Native + Expo) • Real LLM, AI automation, and agent engineering experience — tool-calling, RAG, evals, sandboxing, multi-channel deployment • Strong consulting mindset focused on scalable systems, automation, and business efficiency 📩 Tell me about your project, API integration, AI workflow, CRM automation, or growth challenges — I'll give you an honest take on scope, trade-offs, and how I'd build it.

𝗖𝗹𝗶𝗲𝗻𝘁-𝗰𝗲𝗻𝘁𝗿𝗶𝗰 𝗙𝘂𝗹𝗹-𝘀𝘁𝗮𝗰𝗸 𝗔𝗜 𝗪𝗲𝗯 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 (JavaScript, TypeScript, Node.JS, Nest.JS, Python, FastAPI, Express, Next.JS, React.JS, Vue.JS, React Native, WebRTC) with 𝟮𝟬 𝘆𝗲𝗮𝗿𝘀 𝗼𝗳 𝗲𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲 in custom software development and AI powered applications Completed 𝗼𝘃𝗲𝗿 𝟵𝟬+ 𝗪𝗲𝗯 application & 𝗮𝗻𝗱 𝗠𝗼𝗯𝗶𝗹𝗲 application including copmplex custom AI Agent for Sales, AI Assistant of various complexity for startups, scaleups and enterprises. Build your software with AgilePulse™ empowered by transparent processes, quality control systems and engineering excellence. 🦾 𝗠𝗬 𝗖𝗢𝗥𝗘 𝗧𝗘𝗖𝗛 𝗘𝗫𝗣𝗘𝗥𝗧𝗜𝗦𝗘 | 𝗦𝗘𝗥𝗩𝗜𝗖𝗘𝗦: ⭐ AI & ML DEVELOPMENT: Recognized as a top machine learning and chatbot development provider by Clutch. I deliver AI solutions such as agentic AI development, generative AI, intelligent automation, AI-powered mobile apps, chatbots, and RPA. AI Agent and AI assistant, AI workflow to optimize Sales, HR Tech, Finance, for Insurance, Healthcare, BPO, Fintech, and Finance From strategy to implementation, I guide businesses in extracting data-driven insights, automating workflows, and strengthening their edge with adaptive, autonomous AI models. ⭐ AI AGENT DEVELOPMENT: AI agent for Sales, AI Chatbot, AI agent for ordering food, AI agent for CV, AI agent for HR, AI Voice Agent, AI Voice Assistant, AI Consultant for HelpDesk, AI HelpDesk assistant, AI Assistant for appointment booking, Speech to text - text to speech. LLMs, ChatGPT, OpenAI, Gemini, Perplexity, Claude ⭐ WEB APPLICATION DEVELOPMENT: I specialize in building modern, scalable web applications using technologies like JavaScript, TypeScript, Node.JS, Nest.JS, React.JS, Vue.JS, Angular, .Net, and Python, FastAPI. My expertise as an AI web software developer ensures high performance, security, and user-friendly interfaces tailored to your business needs. ⭐ MOBILE APP DEVELOPMENT: I create responsive, cross-platform mobile applications for iOS and Android. My toolkit includes React Native, Swift, Kotlin, and Java Android to deliver smooth, feature-rich mobile experiences for your users. ⭐ DESIGN ARCHITECTURE: My design architecture services include defining architecture attributes, crafting architecture descriptions, and developing solution and enterprise architectures. I am proficient in migration, monolithic to microservice transformations, serverless architecture, scalability design, security protocols, and network topology. I visualize complex systems using class and component diagrams, fault tolerance designs, UML, and tools like DrawIO. ⭐ DATABASES: My database expertise spans a variety of relational and NoSQL databases, including MongoDB, PostgreSQL, MSSQL, MySQL, and others, to provide fast, efficient, and secure data storage solutions. ⭐ BROWSER EXTENSION DEVELOPMENT: I develop powerful browser extensions to enhance user experience and productivity. My skills cover JavaScript, browser automation, Chrome Extension development, Chrome plugins, Firefox extensions, and LinkedIn automation, enabling seamless integrations and custom workflows. ACHIVEMENTS 🚀 Helped startups raise over $72M in follow-on funding after launching products built by our teams 🚀 One of the client's MVPs that we developed scaled to 500,000+ users within 14 months 🚀 On average, my clients reduce their time-to-market by 32% compared to traditional dev teams 🚀 80% of my clients return for a second phase within the first 6 months 🚀 Onboard dedicated teams in as little as 7-10 business days 🚀 100% transparency through weekly reports, PM dashboards, and performance metrics. 𝗜𝗡𝗗𝗨𝗦𝗧𝗥𝗜𝗘𝗦 Real-time communication / Chat & messaging software / Video-conferencing / Telecommunication / FinTech / E-commerce tech / AI & Machine Learning / AI Agent development / AI Assistant development / AI Agent development / Agentic Commerce / Browser Extension / IoT / Education / EduTech / E-Learning / Real Estate / Logistics & Transportation / Marketplaces / Retail / HRTech / HealthCare / Finance / Hotels & Hospitality / Fintech / Agentic Commerce 🤝🤝🤝 I'm here to provide you with superior services in building your product. If you need help with Software Architecture design or custom software development, I'll be glad to hear from you 🤝🤝🤝

I represent an award-winning company called LITSLINK. We are a product-oriented development team (which consists of 250+ highly qualified software engineers, UI/UX designers, business analysts, project architects, project managers, and QA engineers) experienced in almost all popular areas: ✅ AI: Machine Learning, Computer Vision, Natural Language Processing, Big Data Analytics ✅No-code, Low-code: Bubble, WebFlow ✅ Blockchain: Solidity, Rust, Solana/Near blockchains, smart contracts ✅ Cross-Platform Mobile development React Native, Flutter ✅ Web development: Front-end (React.JS, Vue.JS, Angular.JS); Back-end (Node.JS, Java, Python) ✅ AR/VR: Untiy3D/C#, Hololens, Hololens 2, GearVR, MS Mixed Reality, Oculus, HTC Vive, iOS/Android (AIRKit, ARCore) We provide smart and fast solutions on time and on budget. By hiring us, you are getting the expertise of our software architect board and the whole team's knowledge. Whether you need a single developer or a whole team, we are here to help.