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⭐⭐⭐⭐⭐ 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

Hello, I am an experienced Full-Stack Developer with over 12 years in the software industry. Throughout my career, I have contributed to projects across a diverse range of industries, including E-commerce, Wellness & Fitness, EdTech, Social Media, Hospitality, Retail, Fintech, Media & Entertainment, and Refineries, among others. Here’s a brief overview of my expertise: 🔹 Backend Development: Java, Spring Boot, JPA, Spring Security, Batch Processing, REST APIs, Microservices Architecture. 🔹 Frontend Development: HTML5, CSS3, JavaScript, Angular, React.js. 🔹 Databases: PostgreSQL, MySQL, Derby, MongoDB, DynamoDB. 🔹 AWS & Cloud Services: EC2, VPC, RDS, S3, Elastic Beanstalk, Cognito, SES, CloudFormation, ECS, ELB. 🔹 Virtualization & DevOps: Docker, Docker Compose, CI/CD Pipelines, Jenkins, CircleCI, CodePipeline, Codemagic. 🔹 AI/ML & Intelligent Systems: - Generative AI Integration - OpenAI APIs / LLM Integration - AI Chatbot Development - Machine Learning Model Integration - Prompt Engineering - AI-powered Automation Solutions - NLP (Natural Language Processing) - Python for AI/ML Workflows 🔹 Development Practices: Agile Methodologies, System Design, Scalable Architecture, Performance Optimization, Secure Application Development. 📱 Full Stack Developer 🌐 Backend Developer 💻 Frontend Developer ✅ On Time Delivery ✅ Quick Response ✅ Always Online ✅ Quality Work ✅ Client Satisfaction I have had the privilege of working on a variety of solutions and am comfortable handling both existing and new projects. I have had the opportunity to assist numerous clients in achieving their business goals, and I would be delighted to support you in the same way. Thank you for taking the time to visit my profile. Feel free to reach out—whether you’d like to discuss a project, share ideas, or simply connect. I would be delighted to collaborate and explore how I can support your initiatives. Feel free to 𝗗𝗠 𝗺𝗲 𝗼𝗿 𝗶𝗻𝘃𝗶𝘁𝗲 𝗺𝗲 to your project on Upwork.

⭐⭐⭐⭐⭐"Mykyta has exceptional characteristics both in hard and soft skills. He took a part in complex software development projects as a part of a large mixed group. The feedback from our customers and team is always positive." ⭐I'm the highest-rated and highest-earning Java & Groovy freelancer on Upwork with numerous 5-star reviews, including overly positive feedback. ⭐ I've developed different custom specific software using modern java & groovy software using microservice and monolithic architecture, improved performance, refactored and tested in next business domains: ✅ Utilities ✅ Fintech ✅ Auto ✅ Security ✅ Cryptocurrency ✅✅✅ Brief information about me! ✅✅✅ ✅ Senior Java & Groovy Software Engineer ✅ Specializing in back-end development | Cloud Integrations (AWS, GCP, Azure) ✅ I have over 6.5+ years of experience in Java development ✅ Experienced both in developing software from scratch and maintaining large existing projects ✅ I have hands-on experience in developing back-end web services with micro-service or monolith architecture using Java technology stack, including modern cloud-based solutions. 🌟 WHY YOU SHOULD CHOOSE ME OVER OTHERS? 🌟 ✅ Clients' feedback: I am concentrating on giving VALUE and bringing SUCCESS to all of my customers, earning their TRUST and helping them to EARN MONEY. ALL customers' feedback on my Profile is extremely important to me and proves the value that I provide. ✅ Responsiveness: Communication is extremely important as a part of every business ever existed, and once it is fast and clear, it may lead to awesome results, that's why I tend to be available for my customers in no time, reply fast and clear, as well as I try to be fair, understanding and responsive. ✅ Kindness and Empathy: My main personal principles that I implement in every facet of my life. Treating everyone with respect, aiming to understand the whole situation or problem to solve the pain of my client, and constantly work to IMPROVE the client's product. 🙋🏼‍♂️I am eager to work with you, to provide high-quality code, reliable, consistent solutions, solve your problems and bring success to your business. Contact me, and we will discuss how we can work together to FULLY meet your Business Needs, follow your business rules, and bring you success. A big area of expertise: - REST API design and development - Horizontally scalable and highly available systems - Automating development workflows and deployment pipelines - Micro-service design and development - Design and development of decentralized applications (DApps) - Monitoring, log aggregation - Java and Groovy development - Service-Oriented architecture - Spring Framework (including cloud-based stack) - Experience in NoSQL Development (MongoDB, Neo4j) - Performance and Scalability Optimization Huge Skills & Technologies set: - Java/Groovy - AWS - Linux (with distributives) - Jenkins, CircleCI, Rundeck, Rancher - Docker - MySQL, Postgres - Redis, MongoDB, Neo4j. - RabbitMQ, ActiveMQ, SQS, RabbitMQ

I'm a senior full-stack engineer with 𝟏𝟓+ 𝐲𝐞𝐚𝐫𝐬 of experience, including nearly a decade building at scale for 𝐀𝐩𝐩𝐥𝐞 and 𝐀𝐦𝐚𝐳𝐨𝐧. Unlike most generalists, I also build production-grade AI features. That combination is rare, and it's why clients hire me. Whether you need a scalable web application, a complex backend system, or AI/LLM capabilities woven into an existing product, I can own it end-to-end, architecture through deployment, frontend through infrastructure. 𝐅𝐮𝐥𝐥-𝐒𝐭𝐚𝐜𝐤 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 React + TypeScript frontends with clean component architecture, real-time updates, secure auth flows, and performance tuned for real users. Java backends (Spring Boot, WebFlux, reactive systems), Node.js/TypeScript APIs, REST & GraphQL (Apollo), microservices design, and distributed data layers across DynamoDB, SQL, and NoSQL. I build applications that are testable, maintainable, and designed for scale from day one, not patched together after the fact. 𝐀𝐈 & 𝐋𝐋𝐌 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧 This is where I pull ahead. When a project calls for intelligence, a chatbot, a knowledge assistant, a RAG pipeline, automated workflows, I don't hand it off to a separate AI contractor. I build it myself, integrated cleanly into the same stack. GPT/Gemini integrations, retrieval-augmented generation, context-aware chat systems, prompt pipeline design, structured output with validation, and hallucination mitigation. AI that's engineered into the product, not bolted on. 𝐂𝐥𝐨𝐮𝐝 & 𝐈𝐧𝐟𝐫𝐚𝐬𝐭𝐫𝐮𝐜𝐭𝐮𝐫𝐞 AWS-native architectures, Kubernetes, Helm, Docker, CI/CD pipelines, and production observability with Prometheus, Grafana, and Datadog. SLO-driven monitoring and reliable deployment workflows. Features don't matter if they're not up, I make sure they stay up. 𝐖𝐡𝐲 𝐜𝐥𝐢𝐞𝐧𝐭𝐬 𝐜𝐡𝐨𝐨𝐬𝐞 𝐦𝐞 𝐨𝐯𝐞𝐫 𝐨𝐭𝐡𝐞𝐫 𝐬𝐞𝐧𝐢𝐨𝐫 𝐝𝐞𝐯𝐬:: Most full-stack engineers can't touch AI. Most AI freelancers can't architect real systems. I do both, and I've done it inside two of the most demanding engineering organizations in the world. 𝐒𝐞𝐥𝐞𝐜𝐭𝐞𝐝 𝐫𝐞𝐬𝐮𝐥𝐭𝐬: At Apple, built a React + TypeScript platform for large-scale test execution, developed an AI-powered internal support chatbot, and improved system observability, cutting incident resolution time by 30% and reducing deployment time by 30%. At Amazon, migrated critical systems from Oracle to DynamoDB, reduced infrastructure maintenance by 20%, designed resilient AWS-native services, and helped launch Amazon in new international markets. 𝐈'𝐦 𝐭𝐡𝐞 𝐫𝐢𝐠𝐡𝐭 𝐟𝐢𝐭 𝐢𝐟 𝐲𝐨𝐮 𝐧𝐞𝐞𝐝: A senior engineer who can own your product end-to-end. A full-stack application built properly, architecture-first, scalable, maintainable. AI or LLM features added to an existing product without breaking what's already there. A complex backend, a polished frontend, or both. A technical partner who ships production systems, not prototypes. 𝐇𝐨𝐰 𝐈 𝐰𝐨𝐫𝐤: Architecture-first. MVP fast, production-ready fast. Clean, testable code. Clear communication. Built for scale from day one. I don't build throwaway demos. I build systems that survive production, with or without AI. Let's talk.

AI & Backend Architect with 18+ years building scalable systems using Java/Spring Boot, Python/FastAPI, and cloud-native microservices on AWS. I combine strong software engineering fundamentals with AI-assisted development workflows to deliver faster and safer releases. Daily toolkit includes GitHub Copilot, Claude Code, KiloCode, and Codex for code generation, refactoring, test scaffolding, and technical documentation. Key outcomes: - Reduced trade execution latency from 500ms to 100ms for a stock data platform processing 10K events/sec - Built a RAG-based AI research assistant that cut analyst research time by 60% - Led a distributed team of 8 engineers to deliver a loan management system serving 200K+ users - Designed multi-tenant SaaS backend handling 5M+ daily requests with 99.9% uptime Technical stack: Java 17, Spring Boot 3, Python, FastAPI, Golang, Node.js, PostgreSQL, MySQL, Redis, Docker, Kubernetes, AWS, OpenAI API, LangChain. If you need a senior engineer who can own a problem end-to-end, from system design to deployment, let's talk.

𝟭𝟱+ 𝗬𝗲𝗮𝗿𝘀 · 𝗙𝗼𝗿𝘁𝘂𝗻𝗲 𝟱𝟬𝟬 𝗗𝗲𝗹𝗶𝘃𝗲𝗿𝘆 · 𝟵,𝟭𝟬𝟵 𝗨𝗽𝘄𝗼𝗿𝗸 𝗛𝗼𝘂𝗿𝘀 · 𝟭𝟬𝟬% 𝗝𝗦𝗦. Fractional CTO and Solution Architect across Java, Spring Boot, AWS, Ruby on Rails, Shopify Plus, AI/RAG, Salesforce, and SAP. $200K+ delivered, 12/12 five-star. 𝐈 𝐚𝐦 𝐆𝐮𝐦𝐚𝐧𝐬𝐢𝐧𝐡, founder of Aaitechs. Most CTOs can build. Most salespeople can sell. I do both, which is why I think about revenue and conversion alongside architecture and code. Fifteen years across enterprise Java, Ruby on Rails, Shopify Plus, AI integration, Salesforce, SAP BASIS/HANA, Power BI, and Sales leadership. Earlier in my career I delivered SAP/HANA inside Capgemini's enterprise practice on engagements serving Fortune 500 names including Toyota, Caterpillar, and Hershey. I then spent five years as VP of Sales and Technology at an enterprise software company, owning the GTM motion and technical delivery for clients across the US, UK, and Germany. Managed teams of 15 to 20 engineers. Drove multi-million dollar revenue. ☄️ 𝗖𝗢𝗥𝗘 𝗖𝗔𝗣𝗔𝗕𝗜𝗟𝗜𝗧𝗜𝗘𝗦 ▶ 𝗙𝗿𝗮𝗰𝘁𝗶𝗼𝗻𝗮𝗹 𝗖𝗧𝗢 + 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴 𝗟𝗲𝗮𝗱𝗲𝗿𝘀𝗵𝗶𝗽: Technology strategy and roadmap. Engineering team oversight and hiring. Build vs buy. MVP architecture. Technical due diligence for fundraising and acquisitions. Vendor management. Pre-sales and RFP architecture. ▶ 𝗘𝗻𝘁𝗲𝗿𝗽𝗿𝗶𝘀𝗲 𝗝𝗮𝘃𝗮 + 𝗖𝗹𝗼𝘂𝗱: Java, Spring Boot, Spring Cloud. Microservices, REST, gRPC, Kafka. AWS (Lambda, ECS, EKS, RDS, API Gateway, S3, CloudFront). Spark, Kinesis, EMR. SAP BASIS, HANA, NetWeaver. Liferay. Docker, Kubernetes, Terraform, CI/CD. Event-driven, CQRS, distributed systems. ▶ 𝗥𝘂𝗯𝘆 𝗼𝗻 𝗥𝗮𝗶𝗹𝘀, 𝗦𝗵𝗼𝗽𝗶𝗳𝘆 𝗣𝗹𝘂𝘀, 𝗔𝗜: RAG pipelines on pgvector. GPT-4o agents with deterministic validators. CLIP visual search on Shopify Plus. Hydrogen headless storefronts. Shopify Functions in Rust and JavaScript. AI catalog automation. Production AI inside HIPAA and SOC2 boundaries. ▶ 𝗖𝗥𝗠, 𝗥𝗲𝘃𝗢𝗽𝘀, 𝗗𝗮𝘁𝗮: Salesforce solution architecture, Apex, LWC, Flow. GoHighLevel automation. HubSpot setup. CRM migration. SSRS to Power BI migration. RevOps workflows, lead-routing automation, SMS and WhatsApp pipelines. 🌟 𝗙𝗟𝗔𝗚𝗦𝗛𝗜𝗣 𝗘𝗡𝗚𝗔𝗚𝗘𝗠𝗘𝗡𝗧𝗦 ⇒ Patient360, US Healthcare SaaS, HIPAA clinical AI. Two parallel Rails engagements, 8,257 hours, $191K earned. Autonomous compliance agent covering CMS, HIPAA, HL7 FHIR, and ICD-10. RAG pipeline indexing thousands of CMS pages into pgvector. GPT-4o interpreting clinical notes into structured codes. Deterministic rules engine auditing every AI decision. 70% reduction in manual review. 98% ICD-10 accuracy. Full HIPAA audit trail. Both contracts five-star. ⇒ CBRE, Fortune 500 Commercial Real Estate, 48+ Months. Three-person senior Rails squad embedded in CBRE's global Agile environment. PostgreSQL and Sidekiq tuning cut report generation 50%. SOC2/HIPAA encryption and audit logging. 100% uptime. Same three engineers, four years, zero knowledge loss. ⇒ LuminArc, Shopify Plus Headless Hydrogen. 97 Lighthouse from sub-50 baseline. +43% mobile conversion. Custom React Mix-and-Match outfit builder. ⇒ Salesforce + GoHighLevel + Power BI Stack. Solution architecture from discovery through deployment. GoHighLevel integration with Power BI dashboards replacing legacy SSRS. RevOps workflows, automated lead routing, SMS/email/WhatsApp delivery. Five-star outcomes. ⇒ Capgemini Era, SAP BASIS/HANA inside Capgemini's $22B IT services practice. Enterprise documentation, audit, and security discipline at this scale does not leave you. Every Patient360 audit log, every SOC2 boundary, every HIPAA decision traces back to it. 🌟 𝗛𝗢𝗪 𝗜 𝗘𝗡𝗚𝗔𝗚𝗘 ⇝ 𝗙𝗿𝗮𝗰𝘁𝗶𝗼𝗻𝗮𝗹 𝗖𝗧𝗢 𝗿𝗲𝘁𝗮𝗶𝗻𝗲𝗿 ($𝟴𝗞–$𝟮𝟱𝗞/𝗺𝗼, 𝟴–𝟮𝟬+ 𝗵𝗿𝘀/𝘄𝗸): Ongoing technical leadership, architecture decisions, engineering team oversight, build vs buy, pre-sales and RFP support. Most clients keep me on 6 to 18 months. ⇝ 𝗔𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲 𝘀𝗽𝗿𝗶𝗻𝘁 (𝟮–𝟲 𝘄𝗲𝗲𝗸𝘀, 𝗳𝗶𝘅𝗲𝗱 𝘀𝗰𝗼𝗽𝗲): System design, migration planning, technical due diligence, AI integration roadmap, RFP response architecture. Closes with a written architecture document, decision matrix, and phased rollout plan. ⇝ 𝗛𝗮𝗻𝗱𝘀-𝗼𝗻 𝗯𝘂𝗶𝗹𝗱 ($𝟰𝟱/𝗵𝗿, 𝗵𝗼𝘂𝗿𝗹𝘆 𝗼𝗿 𝗺𝗶𝗹𝗲𝘀𝘁𝗼𝗻𝗲): Production engineering on Rails, Java/Spring Boot, Shopify Plus, or AI systems. Where most Upwork engagements start. Aaitechs is a hand-picked team: senior Rails, Java/Spring Boot, Shopify, AI, and Salesforce engineers plus QA. Many engagements are white-label, so we operate as your lead engineer under your brand. IST with five hours of US/EU overlap daily. Two-hour reply on business days. Send me your project details. I will reply with a plan, timeline, and proposal within two hours on business days. ~ 𝐆𝐮𝐦𝐚𝐧𝐬𝐢𝐧𝐡 𝐆𝐚𝐝𝐡𝐯𝐢, 𝐀𝐚𝐢𝐭𝐞𝐜𝐡𝐬