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I have successfully built numerous applications from inception to production using a wide range of cutting-edge technologies and frameworks, including React, Vue, Angular, Node.js, Laravel, Python, Django, OpenAI, Claude, Solidity, Golang, Rust, Kafka, Scraping, Smart Contracts, Web3, as well as databases like MySQL, MongoDB, PostgreSQL, Shopify, and WordPress. Specifically, I excel in React, Next.js, Node, Python, Laravel, ChatGPT, Claude, Smart Contract and Web3.

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I am adept at Dockerization and orchestration using Kubernetes, and I excel in implementing automated testing and continuous integration/continuous deployment (CI/CD) pipelines.

Key Skills:
- Front-end Development: ReactJS/Redux, Next.js, AngularJS, Vue.js, WordPress, Bootstrap, Tailwind CSS, Material UI, AntD
- Back-end Development: Node.js, Laravel, Django, Flask, PHP, Python, Solidity, Golang, Rust, RESTful API, GraphQL
Cloud and DevOps: Kubernetes, AWS (EKS), GCP (GKE), Azure (AKS), Docker, Git, Terraform, CloudFormation, Linux, Bash
- CI/CD: Designing and implementing automation pipelines
- AI: OpenAI, ChatGPT, Stable Diffusion/Midjourney, Claude, RAG Agent
- Blockchain: Smart Contract, Web3, DApps, DeFi, Token, ICO, DEX, Trading, Cryptocurrency
- Architecture: Cost-efficient, scalable solutions
- Project Management: Cross-functional collaboration and leadership
- Troubleshooting: Advanced problem-solving skills
- Mobile App Development: React Native, Ionic, Apache Cordova, IoT, Socket.io
- Database Management: MongoDB, PostgreSQL, MySQL

Work Style:
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- Thrive under pressure and deliver results within tight deadlines
- Strong problem-solving skills and a proactive approach to challenges
- Highly motivated with a commitment to continuous learning and improvement","rawText":"I am a seasoned full-stack developer with over 8 years of experience, specializing in full-stack development, AI industry and blockchain technologies. I have successfully built numerous applications from inception to production using a wide range of cutting-edge technologies and frameworks, including React, Vue, Angular, Node.js, Laravel, Python, Django, OpenAI, Claude, Solidity, Golang, Rust, Kafka, Scraping, Smart Contracts, Web3, as well as databases like MySQL, MongoDB, PostgreSQL, Shopify, and WordPress. Specifically, I excel in React, Next.js, Node, Python, Laravel, ChatGPT, Claude, Smart Contract and Web3. In addition to my core expertise, I have hands-on experience with trending technologies such as DevOps practice, React Native, Flutter, and more. My career highlights include proficiency in server administration with skills in load balancing, email server setup, domain migration, microservices architecture, and serverless deployments. I am adept at Dockerization and orchestration using Kubernetes, and I excel in implementing automated testing and continuous integration/continuous deployment (CI/CD) pipelines. Key Skills: - Front-end Development: ReactJS/Redux, Next.js, AngularJS, Vue.js, WordPress, Bootstrap, Tailwind CSS, Material UI, AntD - Back-end Development: Node.js, Laravel, Django, Flask, PHP, Python, Solidity, Golang, Rust, RESTful API, GraphQL Cloud and DevOps: Kubernetes, AWS (EKS), GCP (GKE), Azure (AKS), Docker, Git, Terraform, CloudFormation, Linux, Bash - CI/CD: Designing and implementing automation pipelines - AI: OpenAI, ChatGPT, Stable Diffusion/Midjourney, Claude, RAG Agent - Blockchain: Smart Contract, Web3, DApps, DeFi, Token, ICO, DEX, Trading, Cryptocurrency - Architecture: Cost-efficient, scalable solutions - Project Management: Cross-functional collaboration and leadership - Troubleshooting: Advanced problem-solving skills - Mobile App Development: React Native, Ionic, Apache Cordova, IoT, Socket.io - Database Management: MongoDB, PostgreSQL, MySQL Work Style: - Detail-oriented and meticulous in ensuring quality deliverables - Thrive under pressure and deliver results within tight deadlines - Strong problem-solving skills and a proactive approach to challenges - Highly motivated with a commitment to continuous learning and improvement","canEdit":false,"editUrl":"https://www.workana.com/freelancer/ba577822d4a5d9a3997be4ff636e9519/profile/description","g11n":{"edit":"Edit","save":"Save","cancel":"Cancel","warning":"Warning: Don't share contact information or you may be blocked.","expandText":"View more","collapseText":"View less","placeholder":"In a few words, sum up what best defines you as a professional. Show the world what you have to offer and give direction to your freelance career. Ex: Image and sound designer specializing in institutional videos and photo retouching."},"validation":{"required":true,"min":20}},"history":{"section":"history","title":"Work history","dangerouslyWillBeRenderAsHtml_text":"Senior Full Stack/Software Engineer
Shiplux | Jun 2021 - Oct 2024
Node.js, Google BigQuery, Docker, WebRTC, React, Kubernetes, Next.js, NestJS, GPT-4
Problem & Solution: Overhauled the company’s logistics platform to enhance data processing speed and reliability. Migrated legacy systems to a microservices architecture.
Improvement: Improved system response time by 50% and reduced operational costs by 20% through efficient resource utilization.

Blockchain & Web3 Expert
Thegridbiz | Feb 2019 - Jan 2021
TypeScript, Ethereum, Solidity, Go, Web3.js, Truffle suite, Smart contract
Problem & Solution: Led the development of decentralized applications (dApps) to enhance transparency and security in business processes. Addressed scalability issues by implementing layer-2 scaling solutions.
Improvement: Successfully deployed over 10 smart contracts with zero critical vulnerabilities and improved transaction throughput by 30%.

Web & Mobile Developer
Groupon | Feb 2014 - Oct 2018
SQL, Node.js, React, Kotlin, JavaScript, Swift, RESTful API
Problem & Solution: Developed a high-performance mobile application to improve user engagement by addressing slow load times and frequent crashes. Implemented caching mechanisms and optimized the app’s architecture.
Improvement: Reduced app load times by 40% and increased user retention by 25%.","rawText":"Senior Full Stack/Software Engineer Shiplux | Jun 2021 - Oct 2024 Node.js, Google BigQuery, Docker, WebRTC, React, Kubernetes, Next.js, NestJS, GPT-4 Problem & Solution: Overhauled the company’s logistics platform to enhance data processing speed and reliability. Migrated legacy systems to a microservices architecture. Improvement: Improved system response time by 50% and reduced operational costs by 20% through efficient resource utilization. Blockchain & Web3 Expert Thegridbiz | Feb 2019 - Jan 2021 TypeScript, Ethereum, Solidity, Go, Web3.js, Truffle suite, Smart contract Problem & Solution: Led the development of decentralized applications (dApps) to enhance transparency and security in business processes. Addressed scalability issues by implementing layer-2 scaling solutions. Improvement: Successfully deployed over 10 smart contracts with zero critical vulnerabilities and improved transaction throughput by 30%. Web & Mobile Developer Groupon | Feb 2014 - Oct 2018 SQL, Node.js, React, Kotlin, JavaScript, Swift, RESTful API Problem & Solution: Developed a high-performance mobile application to improve user engagement by addressing slow load times and frequent crashes. Implemented caching mechanisms and optimized the app’s architecture. Improvement: Reduced app load times by 40% and increased user retention by 25%.","canEdit":false,"editUrl":"https://www.workana.com/freelancer/ba577822d4a5d9a3997be4ff636e9519/profile/history","g11n":{"edit":"Edit","save":"Save","cancel":"Cancel","warning":"Warning: Don't share contact information or you may be blocked.","expandText":"View more","collapseText":"View less","placeholder":"Describe your work on previous projects, your role, and your contributions for each milestone of your professional career. Tell us how your work has brought value to the projects you have collaborated on in the past. Choose the most relevant aspects for each position, what you learned and achieved, and anything else that will help in understanding your career path."},"validation":{"required":true,"min":20,"max":50000}}},"profileCompleteness":{"show":false},"newProfileCard":{"canEditCompany":false,"canAddFavorite":false,"addFreelancersDropdownTitle":"Add to list","isHero":false,"isVerifiedAgency":false,"companyVisibleName":"V. P.","companyId":11055621,"companyHash":"ba577822d4a5d9a3997be4ff636e9519","ratingData":{"rating":0,"hasRating":false,"width":"width: 0","noRatings":"No ratings yet","average":0,"ratingText":"No ratings yet"},"profileVisibilityEditInitials":{"isChecked":true,"actionUrl":"https://www.workana.com/companies/profile/edit/visibility","g11n":{"toggleLabel":"Public Profile"}},"agencyEditInitials":{"isChecked":false,"actionUrl":"https://www.workana.com/companies/profile/edit/is_agency","g11n":{"toggleLabel":"Agency Profile"}},"phone":{"text":"Phone number: ","canEditPhone":false,"hasPhone":false,"number":null},"countryData":{"country":"UA","name":"Ukraine","class":"flag flag-ua","url":"https://www.workana.com/freelancers/ukraine?ref=freelancer_view","blankGif":"https://cf.wkncdn.com/static/assets/build/img/blank.4f4e80a62.gif"},"hourlyRate":{"text":"Hourly rate:","rate":"USD 20.00","isSet":true,"currency":"USD","amount":"20.00"},"mainSkill":{"isSet":true,"text":"Freelancer expert in IT & Programming"},"public":true,"clarificationText":"Allowed formats:
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Soy un creador digital que convierte ideas en aplicaciones web y móviles reales, funcionales y modernas utilizando herramientas avanzadas, flujos de inteligencia artificial y plataformas. Mi especialidad es transformar conceptos en productos completos: desde la estructura, el diseño, la lógica del negocio, la base de datos y la experiencia de usuario. Construyo soluciones que un desarrollador tradicional tardaría semanas o meses en entregar, pero con una calidad visual sólida y una arquitectura pensada para escalar. He desarrollado sistemas para distintos tipos de proyectos, incluyendo: plataformas deportivas y de torneos, sistemas de reservas y administración, soluciones para restaurantes y cafeterías, apps especializadas para chefs, comunidades gamer y startups que buscan automatizar tareas o lanzar su primer MVP. ¿Cómo puedo ayudarte? 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Atuo como consultor Linux e soluções Open Source, implantando e estudando novas soluções no dia dia de acordo com o desenvolvimento e necessidade de cada cliente. Atuando na área de redes, segurança e consultoria de soluções open-source, possuo as certificações LPIC (Linux Professional Institute) LPIC1, LPIC2 , LPIC3 (Core) e LPI3 (303 - Security). Minhas especialidades são o gerenciamento de servidores, cloud computing e administração de sistemas. Mi apresentación en español: Desde 2001 trabajo con redes y servidores Linux. Trabajo como consultor de Linux y soluciones de código abierto, implementando y estudiando nuevas soluciones diariamente de acuerdo con el desarrollo y las necesidades de cada cliente. Actuando en el área de redes, seguridad y consultoría de soluciones de código abierto, tengo las certificaciones LPIC1 (LPIC2, LPIC2, LPIC3 (Core) y LPI3 (303 - Seguridad) de LPIC (Linux Professional Institute). Mis especialidades son la administración de servidores, la computación en la nube y la administración de sistemas. My presentation in English: Since 2001 I work with networks and Linux servers. I work as a Linux consultant and Open Source solutions, implementing and studying new solutions on a daily basis according to the development and needs of each client. Acting in the area of networks, security and open-source solutions consulting, I have the LPIC (Linux Professional Institute) LPIC1, LPIC2, LPIC3 (Core) and LPI3 (303 - Security) certifications. 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Possuo também grande experiência em ferramentas Open-Source que não dependem de licenças e podem também auxiliar na produtividade de seus utilizadores. Mi experiencia en español Tengo experiencia en administración de redes y servidores Linux, con experiencia en entornos con alto volumen de datos y criticidad. También soy un experto en Cloud Computing y Virtualización con certificaciones y capacitación de Microsoft Azure, además de experiencia con servidores virtuales en el entorno de Amazon AWS. Actuando para mantener los sistemas siempre disponibles y libres de fallas que puedan comprometer su operación continua e ininterrumpida, realizo tareas relacionadas con la seguridad de la información además de las pruebas de vulnerabilidad e intrusión, con el objetivo de mantener los sistemas que administro siempre operativos y actualizados. Tengo la certificación LPIC de nivel 3, una de las certificaciones más consideradas en el mercado en lo que respecta a Linux y me está consolidando como especialista en el sistema operativo. Siempre busco una mejora profesional y una buena relación con clientes y socios. Mantengo mi cartera en el sitio web de divulgación de mi servicio, donde se muestran algunos de mis productos y servicios, este enfocado en mensajes electrónicos. También tengo una gran experiencia en herramientas de código abierto que no dependen de las licencias y que también pueden ayudar en la productividad de sus usuarios. My experience in english: I have experience in network administration and Linux servers, with experience in environments with high volume of data and criticality. I am also an expert in Cloud Computing and Virtualization with Microsoft Azure certifications and training in addition to experience with virtual servers in the Amazon AWS environment. 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Let’s build something amazing together!","logos":{"normal":{"url":"https://workana.s3.amazonaws.com/logos/320f71d678ccd70d51cdabb6a4c911a9/vz/7852a49b78e4412d8dbd67844ec1c9da_160_160.png","width":160,"height":160},"thumb":{"url":"https://workana.s3.amazonaws.com/logos/320f71d678ccd70d51cdabb6a4c911a9/op/7852a49b78e4412d8dbd67844ec1c9da_30_30.png","width":30,"height":30},":original":{"url":"https://workana.s3.amazonaws.com/logos/320f71d678ccd70d51cdabb6a4c911a9/za/7852a49b78e4412d8dbd67844ec1c9da.png","width":600,"height":598},"profile":{"url":"https://workana.s3.amazonaws.com/logos/320f71d678ccd70d51cdabb6a4c911a9/by/7852a49b78e4412d8dbd67844ec1c9da_192_192.png","width":192,"height":192},"large":{"url":"https://workana.s3.amazonaws.com/logos/320f71d678ccd70d51cdabb6a4c911a9/wm/7852a49b78e4412d8dbd67844ec1c9da_300_300.png","width":300,"height":300}},"country":"JP","lastActive":"2025-12-21 16:56:21","created":"2025-04-29 13:20:16","open":0,"active":0,"completed":"1","rating":"5.00","paid":1,"verifiedPaymentMethod":false,"worker":{"id":10166097,"slug":"kenta-yamamoto-1","canInvite":false,"skills":{"287":{"id":287},"274":{"id":274},"768":{"id":768},"1012":{"id":1012},"685":{"id":685},"1050":{"id":1050},"234":{"id":234},"280":{"id":280},"913":{"id":913},"1018":{"id":1018},"926":{"id":926},"1120":{"id":1120},"97":{"id":97},"68":{"id":68},"187":{"id":187},"990":{"id":990},"78":{"id":78},"308":{"id":308},"362":{"id":362},"853":{"id":853},"246":{"id":246},"283":{"id":283},"921":{"id":921},"991":{"id":991},"997":{"id":997},"689":{"id":689},"928":{"id":928},"756":{"id":756},"934":{"id":934},"182":{"id":182},"67":{"id":67}},"history":"2018 ~ 2020: Full Stack Developer Company: Zfort Group As a Full Stack Developer at Zfort Group, I worked on various web applications, primarily focusing on both frontend and backend development. I contributed to projects for clients in e-commerce and healthcare, ensuring smooth integrations and high-performance solutions. A major project involved optimizing a large e-commerce platform that had slow response times due to inefficient database queries. I used Node.js for backend optimization, along with MongoDB to improve data storage and retrieval times, and implemented React.js for a more responsive and dynamic frontend. 2020 ~ 2024: Senior Full Stack Developer and Blockchain Developer Company: Softengi At Softengi, I took a leadership position in both full-stack development and blockchain solutions. My primary responsibility was building scalable applications and integrating blockchain technology for a variety of clients, including startups in finance and supply chain. A key project involved implementing smart contracts for a decentralized finance (DeFi) project that required secure transactions and an intuitive user interface. I developed Solidity smart contracts and integrated them with Ethereum using Truffle and Web3.js for frontend interaction. I also worked on enhancing system scalability with AWS cloud solutions. Present: Senior Full Stack and AI Developer Company: Freelancing Currently, as a Senior Full Stack and AI Developer, I focus on building intelligent applications using AI models and integrating them into full-stack environments. I'm working on projects involving AI-powered chatbots, machine learning solutions, and automation for various clients in healthcare and e-commerce. One of my ongoing projects involves integrating AI into existing backend systems while ensuring minimal performance impact and a seamless user experience. I implemented FastAPI for AI-based services, leveraging Python libraries like TensorFlow and PyTorch, and optimized API calls for real-time responses.","rating":5,"ranking":112,"position":{"position":"platinum","next":{"name":"Hero","next":null,"description":"Hero es el máximo nivel de los freelancers de Workana. Nos enorgulleces. Tu experiencia, responsabilidad y profesionalismo hacen que te destaques, por eso tienes los mejores beneficios. ¡Sigue brillando! Leer más","explain":"El freelancer HERO ha llegado al nivel máximo en Workana. Si necesitas a un experto, no busques más. Un freelancer Hero ha demostrado que su talento, servicio y compromiso son excelentes. Trabajar con ellos es un placer. Leer más"},"name":"Platinum","description":"Platinum es el quinto nivel de Workana. ¡Estás llegando a la cima! Ahora más que nunca recuerda chequear tu actividad en la plataforma: ingresos, calificaciones y clientes satisfechos. ¡Sigue siendo un éxito! Leer más ","explain":"Un freelancer Platinum es realmente un profesional TOP. El talento Platinum conoce a sus clientes, sabe trabajar de manera remota y brinda un excelente servicio. Su carrera no para de crecer, y solamente le falta conocerte a ti. ¿Qué esperas para contratarlo? Leer más"},"completed":5,"hourlyRate":{"rate":25,"currency":"USD"},"badges":[{"type":"membership_premium","profile":"worker","active":true}],"shouldShowHireMeDialog":false},"profileUrl":"https://www.workana.com/freelancer/743eae60b404b00c452d1877178f5751","logoUrl":"https://cf.workana.com/logos/320f71d678ccd70d51cdabb6a4c911a9/vz/7852a49b78e4412d8dbd67844ec1c9da_160_160.png","truncatedCompanyDescription":"Hello! I'm a Senior Full Stack, Mobile, and AI Developer with 7+ Years of Experience I'm a results-driven developer with a strong background in web, mobile, and AI-powered applications. 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