Hire the Best Serverless Developers
in Ukraine

🏆 TOP-RATED PLUS (TOP 3% on Upwork) | 💭 Looking for a tech partner to bring your vision to life? Whether you're launching a startup, scaling an existing business, or pivoting your current venture - I help companies succeed as an Full Stack Developer with strong full-stack and cloud architecture expertise. I help turn prototypes built with Lovable, Base44, or Bolt.new into properly designed, production-ready products and MVPs - scalable, maintainable, and cost-effective. As an Full Stack Developer, I specialize in designing, building, and scaling reliable systems on AWS that power modern web and AI-driven applications. 🔍 What I Can Help You With: 🚀 MVP Development: As an Full Stack Developer, I build MVPs fast using scalable AWS services so you can validate ideas and monetize quickly. 🚀 Full-Stack & AWS Backend Development: End-to-end solutions led by an Full Stack Developer, combining robust back-end systems with modern front ends. 🚀 Custom Cloud Solutions: Thoughtfully designed AWS architectures crafted by an AWS Backend Developer to be cost-effective from day one and scale seamlessly with growth. 🚀 AI-Powered Tools: I integrate AI solutions into AWS-native back ends, leveraging my experience as an AWS Backend Developer. 🚀 Reliable Data Pipelines: Event-driven, serverless pipelines designed by an AWS Backend Developer for real-time, high-volume data processing. 🚀 Technical Leadership: As a senior AWS Backend Developer, I provide end-to-end guidance from architecture design to stable production operations. 👨‍💻 Tech I Work With: 💻 Backend / Frontend / Full-Stack Development (AWS-focused): ✔️ Python (Django / Flask / FastAPI) / Node.js / NestJS / Express.js ✔️ PostgreSQL / MongoDB ✔️ React / Next.js / JavaScript / TypeScript ✔️ HTML / CSS / Tailwind / MUI / Ant Design / shadcn/ui 🧠 AI & Machine Learning: ✔️ AWS Bedrock / LangChain / LangGraph / CrewAI / Hugging Face ✔️ Chatbot / AI Assistant / Agentic Applications / CopilotKit / AG-UI ✔️ Amazon Transcribe / Polly / Comprehend ✔️ RAG, Ragie.ai, Vector databases (Pinecone, Weaviate, Chroma, AWS OpenSearch, Supabase Vector Store) ✔️ OpenAI (GPT-5, GPT-4o, GPT-4o-mini, GPT-3, Realtime API, Whisper, TTS, DALL·E, Embeddings) ✔️ Anthropic Claude / Google Gemini / DeepSeek 🕸️ Web Scraping ✔️ Puppeteer / Selenium / Playwright ✔️ Crawlee / Apify / BrightData / Decodo / Oxylabs / SerpApi / ZenRows ☁️ AWS Cloud (Core Expertise of an AWS Backend Developer): ✔️ Serverless architectures, Lambda, Step Functions, API Gateway, S3, DynamoDB, SNS, SQS, and more 🚀 Infrastructure as Code & CI/CD: ✔️ AWS CDK / Terraform / Pulumi / Serverless Framework ✔️ GitHub Actions / GitLab CI/CD 🚀 Let’s Build Your Next Big Thing! 📊 As an Full Stack Developer with a decade of experience in software architecture and technical leadership, I design systems that are scalable, secure, and cost-efficient. If you’re looking for an Full Stack Developer who can own your infrastructure and backend end-to-end, you’re in the right place. 💼 Ready to partner? Message me today, and let’s get started!

🏆 Top Rated Plus mobile and AI app developer with 15+ years building iOS, Android, Flutter, and React Native apps. I specialize in AI integrations, LLM agents, and automation, with CTO-level experience leading mobile and SaaS product builds. Hi, I'm Aleksandr Vdovichenko, a senior mobile app developer and AI engineer who helps startups, scale-ups, and product teams ship reliable iOS and Android apps and AI-powered SaaS products. I work across native iOS development with Swift and SwiftUI, native Android development with Kotlin, and cross-platform mobile development with Flutter and React Native, and I integrate AI deeply into the products I build. 📱 Mobile App Development I build native iOS apps with Swift and SwiftUI for iPhone, iPad, and Mac, and native Android apps with Kotlin for phones and tablets, as well as cross-platform Flutter and React Native apps that run on both. I take MVPs from idea to App Store and Google Play release, and I handle app refactors, performance optimization, and stability reviews on existing products. My builds routinely include push notifications, deep links, in-app purchases, subscriptions and payments, along with Bluetooth, Apple HealthKit, Google Fit, camera, AR, and offline-first features. On the backend side I handle API integration with GraphQL and REST, Firebase, Supabase, and custom backends. 🤖 AI & Automation I build LLM-powered apps on the OpenAI, Claude, and Anthropic APIs, and I develop autonomous AI agents with multi-step reasoning workflows rather than simple chatbots. I use Claude Code for production AI logic and backend orchestration, and I integrate AI into existing iOS, Android, and SaaS products. My work here includes Whisper-based voice features, OCR, computer vision, and pose estimation, AI automation pipelines with n8n, Make, and custom serverless workflows, and retrieval-augmented generation with embeddings, vector databases, and intelligent search across fitness, health, fintech, and social apps. ⚡️ No-Code & Low-Code Speed For founders who need to validate fast, I combine native skills with modern no-code and low-code stacks. I build full SaaS platforms in Bubble, cross-platform mobile MVPs in FlutterFlow, and rapid prototypes with Lovable, Replit, Bolt.new, and v0. I use Webflow for marketing sites and scalable web apps, Adalo, Glide, and Airtable for lightweight no-code products, Capacitor and Expo for hybrid deployment, and Supabase, Firebase, and Vercel for backend and hosting. 🎯 Industries I work across SaaS platforms, fintech and trading apps, health and fitness apps, mental wellness, telemedicine, social and dating apps, e-commerce and marketplaces, food delivery, education, and AI-first products. 🤝 How I Work I give clear architecture and tech stack recommendations from day one, deliver predictably with regular demos and progress reports, and write clean, maintainable code your future team can pick up. I focus on App Store and Google Play compliance, performance, and stability, and I stay on for long-term maintenance and scaling support. If you're planning a new mobile app, an AI-powered SaaS, an MVP, or scaling an existing product, let's discuss your goals and define the right approach. 💌 Send a message and let's build something that ships and scales.

Full Stack Developer and technical partner with 10+ years of experience building SaaS platforms, cloud applications, and complex digital products from idea to production. ⭐ 5.0 client feedback 🏆 100+ successful client partnerships 🤖 AI-enhanced engineering with Claude and modern AI tools 🚀 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. ⚡ WHAT SETS ME APART → 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. → 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. → End-to-end technical ownership Discovery → Architecture → Frontend → Backend → APIs → Cloud → QA → Deployment → 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. 🛠 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. 🤝 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 ⚡ Send me an invite and let’s get started!

⭐⭐⭐⭐⭐ Top Rated Plus on Upwork 100% Job Success Score I'm a Java developer with 8+ years delivering production-grade systems from serverless AWS architectures to distributed microservices serving healthcare and fintech clients. 𝗪𝗵𝗮𝘁 𝗜'𝘃𝗲 𝗕𝘂𝗶𝗹𝘁 ➡ As lead Java developer at my current company, managed a team of 8 engineers over 7 years — delivering 4 production systems across healthcare, fintech, and AI verticals. ➡ Designed serverless AWS infrastructure for a US longevity and healthcare platform as an AWS developer — Lambda, AppSync, DynamoDB, Cognito, SNS/SQS, Stripe, HubSpot currently in production. ➡ Led migration from monolithic Spring apps to distributed microservices — reducing deployment complexity and enabling independent scaling per service. ➡ Built a PDF/UA accessibility compliance platform as backend developer using Java 21, iText 7, PDFBox, veraPDF processing and remediating documents of hundreds of pages against international accessibility standards. ➡ Delivered an AI-powered workflow automation platform as an AI developer integrating Spring AI, Azure cloud, and automated Stripe subscription workflows. ➡ Shipped a medical practitioner dashboard integrating 3rd-party hardware APIs and clinical toolkits as backend developer and tech lead serving real patients and practitioners in production. Core experience as a Java developer and Backend developer As a Java developer with 8+ years in production systems, my core is Java 8 through Java 21 with the full Spring ecosystem Boot, Cloud, Security, WebFlux, Batch, and Spring AI for AI-integrated backends. I work across both relational (PostgreSQL, MySQL) and NoSQL (MongoDB, DynamoDB, Redis) databases, selecting the right store based on access patterns not habit. As a backend developer I've optimised slow MongoDB queries to cut response times, redesigned DynamoDB access patterns for a high-throughput healthcare API, and built Redis caching layers that kept latency flat under load. As an AWS developer, my hands-on stack covers Lambda, AppSync, DynamoDB, Cognito, SQS, SNS, SES, S3, API Gateway, Route 53, and CloudFormation built and maintained in a live US healthcare platform. I design serverless pipelines end-to-end, not just deploy to them. For async workloads I wire event-driven systems using Kafka, RabbitMQ, or AWS SNS/SQS depending on durability and throughput requirements. On the container side: Docker, Kubernetes, Helm, OpenShift, Terraform, and Jenkins full IaC from infrastructure definition to CI/CD pipeline. As an AI developer, I've shipped Spring AI integrations for workflow automation backends, built document intelligence services capable of processing and remediating hundreds-of-pages PDFs against accessibility standards, and connected GraphQL APIs via AWS AppSync for mobile and web AI-driven applications. I also have production experience integrating medical hardware APIs, Stripe subscription billing, and HubSpot CRM sync into Java backends the kind of third-party integration work every backend developer eventually owns in a real product. AWS Developer & 𝗖𝗹𝗼𝘂𝗱 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴 ✅ Currently operating as AWS developer on a live healthcare platform Lambda, AppSync, DynamoDB, Cognito, SQS/SNS/SES, S3, API Gateway, Route 53, CloudFormation ✅ Experience as AWS developer across serverless, containerized (ECS/K8s), and IaC (Terraform, CloudFormation) environments ✅ Also experienced across Azure (AKS, Azure DevOps) and GCP as multi-cloud backend developer ✅ Kubernetes, Helm, Docker, OpenShift, Jenkins, Terraform the full DevOps chain every AWS developer deploys through AI developer 𝗖𝗮𝗽𝗮𝗯𝗶𝗹𝗶𝘁𝗶𝗲𝘀 ✅ Delivered AI-powered backend services as AI developer using Spring AI automated content generation and workflow orchestration at scale ✅ AWS AppSync + DynamoDB + Cognito pipeline for a live healthcare platform: the architecture an AI developer builds when latency and data integrity are non-negotiable ✅ Experienced AI developer integrating third-party AI tooling with enterprise Java backends designing event-driven pipelines that handle async AI workloads via Kafka and SQS ✅ As AI developer, built document intelligence features automated PDF tagging, structure remediation, and accessibility validation across large document corpora 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝗶𝗲𝘀 Healthcare · Fintech · SaaS · E-commerce · Logistics · Telecom · IoT · Blockchain · Automotive · Media 𝗦𝗽𝗲𝗰𝗶𝗮𝗹𝗶𝘇𝗮𝘁𝗶𝗼𝗻𝘀 & 𝗥𝗼𝗹𝗲𝘀 ✔ Senior Java Developer · Java Spring Boot Developer · Java Backend Developer ✔ AWS Cloud Engineer · AWS DevOps Engineer ✔ Azure Cloud Engineer · Google Cloud Engineer ✔ AI Backend Developer · Full-Stack Developer (Spring Boot + React) ✔ AI Backend Developer · Full-Stack Developer (Spring Boot + React) Need a Java developer, backend developer, AWS developer, or AI developer who ships production systems — not prototypes? Drop me a message. 04/06/2026

✔️ 𝐅𝐮𝐥𝐥 𝐒𝐭𝐚𝐜𝐤 𝐌𝐕𝐏 & 𝐒𝐚𝐚𝐒 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 ✔️ 𝟕+ 𝐘𝐞𝐚𝐫𝐬 𝐄𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞 | 𝟏𝟎𝟎% 𝐂𝐥𝐢𝐞𝐧𝐭 𝐒𝐚𝐭𝐢𝐬𝐟𝐚𝐜𝐭𝐢𝐨𝐧 ✔️ 𝐑𝐞𝐚𝐜𝐭, 𝐑𝐞𝐚𝐜𝐭 𝐍𝐚𝐭𝐢𝐯𝐞, 𝐍𝐞𝐱𝐭.𝐣𝐬, 𝐍𝐨𝐝𝐞.𝐣𝐬, 𝐓𝐲𝐩𝐞𝐒𝐜𝐫𝐢𝐩𝐭, 𝐒𝐮𝐩𝐚𝐛𝐚𝐬𝐞, 𝐅𝐢𝐫𝐞𝐛𝐚𝐬𝐞, 𝐓𝐚𝐢𝐥𝐰𝐢𝐧𝐝 𝐂𝐒𝐒, 𝐀𝐈 𝐅𝐞𝐚𝐭𝐮𝐫𝐞𝐬 ✔️ 𝐑𝐞𝐬𝐩𝐨𝐧𝐬𝐢𝐯𝐞 𝐔𝐈𝐬, 𝐒𝐜𝐚𝐥𝐚𝐛𝐥𝐞 𝐀𝐩𝐩𝐬 I am a highly experienced JavaScript, TypeScript Developer with expertise in ReactJS, Next.js, Node.js, TypeScript, Supabase, and Tailwind CSS. I have successfully built and deployed modern, responsive, and feature-rich web applications for startups, enterprises, and SaaS businesses. I’m available for challenging, forward-thinking web projects—whether you're launching a startup MVP, scaling an existing platform, or need expert consulting. 🛠𝐌𝐲 𝐬𝐤𝐢𝐥𝐥 𝐬𝐞𝐭: ✔ Frontend: React, Next.js, React Native, TanStack Query, Zustand, Tailwind CSS, Shadcn/ui, Framer Motion, Three.js, Mapbox ✔ Backend: Node.js, NestJS, Python, tRPC, GraphQL, Hono, FastAPI ✔ Headless CMS: Strapi, Sanity ✔ Object-Relational Mapping (ORM) library: Prisma ORM, TypeORM and data modeling ✔ Databases & Backend-as-a-Service: Supabase, Firebase (Firestore, Realtime Database, Auth, Functions), PostgreSQL (Drizzle ORM), MongoDB, Redis, Pinecone ✔ Payments: Stripe, RevenueCat (Senior Level) ✔ Cloud & DevOps: Vercel, AWS (Lambda, S3, RDS), GCP, Netlify, Docker, Kubernetes, GitHub Actions, Cloudflare Workers ✔ AI & Automation: OpenAI APIs, LLM integration, Python scripting for data workflows, n8n 💯𝐌𝐲 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞: - Top 1% in modern stacks: React.js, React Native, Next.js, Node.js, TypeScript, GraphQL, Tailwind. - Skilled in backend and serverless platforms like Supabase, Firebase, Express.js. - Expert in Next.js 15, App Router, Server Actions, and performance optimization. - Integrated Headless CMS like Strapi, Sanity. - Proficient in MongoDB, PostgreSQL, Prisma ORM, and data modeling. - Experienced with Vercel, AWS, Netlify, Docker, and modern CI/CD pipelines. - Collaborated with 6+ companies globally, managing frontend and backend architecture. - Certified developer with a 100% client satisfaction rate and long-term project success. 🌍𝐈𝐧𝐝𝐮𝐬𝐭𝐫𝐢𝐞𝐬 𝐈 𝐒𝐞𝐫𝐯𝐞: ✔ SaaS Platforms ✔ Sports & Fitness ✔ Fintech & Banking Solutions ✔ E-commerce & Marketplaces ✔ Healthcare Applications ✔ Real Estate & CRM Solutions ✔ AI & Automation Tools 🚀𝐈'𝐥𝐥 𝐏𝐫𝐨𝐯𝐢𝐝𝐞 𝐘𝐨𝐮 𝐖𝐢𝐭𝐡 𝐒𝐨𝐥𝐮𝐭𝐢𝐨𝐧𝐬 𝐓𝐡𝐚𝐭 𝐀𝐫𝐞: - Pixel Perfect Development - Clean Code - High-Quality - Scalable - Reliable 🅰️𝐀𝐯𝐚𝐢𝐥𝐚𝐛𝐢𝐥𝐢𝐭𝐲: - 40+ hours/week availability for full-time & long-term projects - Daily updates & transparent communication - Bug-free, scalable solutions with best coding practices 📩 Message me anytime. Let's create something exceptional together.

I build SaaS products and Chrome extensions using Next.js, Supabase, TypeScript, and React. Most of the products I work on start as MVPs but are expected to grow, so I think about authentication, billing, permissions, and maintainability from the beginning. I usually work with founders who already have a product idea and need someone who can take ownership of the technical side of implementation. That might mean building a system from scratch, improving an existing codebase, or cleaning up a prototype that has become difficult to maintain. Some of the work I’ve done recently: - Building full-stack SaaS applications with authentication, file uploads, Stripe billing, dashboards, and AI-powered functionality - Developing Chrome extensions connected to SaaS backends through secure authentication, background processing, and data synchronization - Refactoring large Next.js applications to improve SEO, SSR, caching strategies, and long-term maintainability - Designing Supabase systems involving Auth, PostgreSQL, Row Level Security (RLS), Storage, and server-side logic - Improving search and filtering performance through query optimization and server-side rendering - Integrating third-party services such as Stripe, OpenAI, and Podio into existing products Technologies I work with regularly include Next.js, React, TypeScript, Supabase, PostgreSQL, Stripe, Vercel, OpenAI API, Chrome Extensions (Manifest V3), REST APIs, serverless functions, SSR, caching strategies, and role-based access systems. If you're ready to hand off the technical heavy lifting and focus on growth, drop me a message and let's map out your roadmap.