Hire the best Kotlin Developers in Budapest, HU
Check out Kotlin Developers in Budapest, HU with the skills you need for your next job.
- $60 hourly
- 4.2/5
- (60 jobs)
I am a full-stack mobile app/web service developer. During my 25-year programming experience, I have succeeded in many projects with different technologies and programming languages be it an embedded system or an encrypted mobile communication service. I have always enjoyed helping give birth to a new app or service. In my work, my code is very simple: to remove your headache. I am interested in: - Cordova Plugin development - Capacitor Plugin development - Hybrid app development (React Native/Ionic/Cordova) - React JS development - AWS, Firebase, - API development - Android native app development - iOs native app development(Objective-C/C++) - Integrating/migrating your legacy (C/C++) lib to Android (JNI, NDK) - ME(R/A)N(Mongo/Express/React Native/Angular/Node) projects Whether it is a project of 15+ or of a single developer you can count on my 15+ years of experience in the mobile/embedded industry, ps: I am sorry that I haven't taken any tests, but having sites with all the solutions for the tests makes them quite difficult to rely on.
Kotlin
Plugin DevelopmentiOS DevelopmentApache CordovaiOSReact NativeReactAngularObjective-CNode.jsIonic FrameworkJavaJavaScriptAndroidNative App Development - $50 hourly
- 5.0/5
- (23 jobs)
💡 Over the past 10 years, I’ve built high-performance web, mobile, and AI-powered applications that drive real business value. My expertise spans React, Vue, Next.js, Node.js, Python, Flutter, and React Native, delivering robust SaaS platforms, Single Page Applications (SPA), and AI-driven solutions. 📈 My work powers businesses across fintech, healthcare, AI, and e-commerce, with applications that have scaled to millions of users and generated significant revenue. Whether you need an AI-powered chatbot, a scalable SaaS product, or a mobile app, I bring deep technical expertise and strategic thinking to the table. 🔹 Looking for a reliable, long-term tech partner? Let’s chat! I specialize in helping enterprise companies scale their platforms efficiently. Now TOP RATED PLUS on Upwork! 🟢 KEY SKILLS 🌟 Full-Stack & SaaS Development: ✔️ Architecting scalable web & mobile applications with React, Vue, Next.js, and Node.js ✔️ Backend expertise with Express, FastAPI, and Nest.js ✔️ API development & integration (REST, GraphQL, WebSockets) ✔️ Authentication & security: OAuth, JWT, Firebase Auth 🌟 Mobile App Development: ✔️ React Native, Flutter, Swift, Kotlin for cross-platform and native apps ✔️ UI/UX expertise with Material UI, Tailwind CSS, and SwiftUI ✔️ Performance optimization and CI/CD for seamless updates 🌟 AI & Machine Learning: ✔️ AI-powered solutions using OpenAI, LangChain, TensorFlow, PyTorch ✔️ Chatbots, AI agents, and NLP-based applications ✔️ Recommendation systems and predictive analytics 🌟 Cloud & DevOps: ✔️ Cloud deployment on AWS, Google Cloud, Firebase, and DigitalOcean ✔️ CI/CD pipelines with Jenkins, GitHub Actions, Fastlane ✔️ Scalable databases: PostgreSQL, MongoDB, Firebase Firestore 🌟 Data Management & Testing: ✔️ Database design & optimization (SQL, NoSQL) ✔️ Unit & integration testing with Jest, Cypress, Mocha, XCTest ✔️ AB Testing, analytics, and performance monitoring 🔥 Why Work With Me? ✅ Full-cycle development: From idea validation to launch & scaling ✅ Enterprise-ready solutions: Robust, maintainable, and scalable architecture ✅ Proven track record: Apps with millions of users & high revenue generation ✅ Long-term partnerships: I work closely with teams to ensure continuous growth 📩 Let’s build something amazing! Contact me today for a free consultation 🚀
Kotlin
Apple XcodeOpenAI APIFirebaseNode.jsJavaScriptReactMobile App DevelopmentFlutterReact NativeAndroid App DevelopmentiOSiOS DevelopmentSwiftApp Development - $50 hourly
- 5.0/5
- (21 jobs)
✅ I have crafted backend systems for four Fortune 500 companies in the banking, e-commerce, and AI industries, each generating over $4 million in revenue in their first year. Furthermore, I spearheaded the development of internal CRM systems for three companies, resulting in a remarkable 54% decrease in operational costs. If you're looking for an experienced developer who delivers robust solutions and boosts revenue, feel free to reach out. I'm a top-rated professional on Upwork. ⭕ Reach out to me for high-quality projects based on Java and Python. ⚙️ Possessing a robust understanding of Agile Software Development processes (Scrum, Waterfall, Hybrid, Agile) and expertise in Code Review processes across projects of varying scales. 🤝 A collaborative team player with the ability to effectively engage with architects, engineers, and product management to deliver user-friendly and visually appealing results. ▪️ Take pleasure in producing clean, well-written, and highly efficient code in my projects. I firmly believe that good communication is the key to creating successful products. Key technologies: ✅ Microservices development ✅ Python ✅ Java 13 ✅ Kotlin ✅ Spring boot, Spring cloud ✅ Kubernetes ✅ PostgreSql ✅ Angular ✅ Redis ✅ ElasticSearch ✅ RabbitMQ ✅ Spring Security ✅ Keycloak ✅ Maven ✅ WebSocket ✅ MongoDB ✅ Docker ✅ Jenkins ✅ GraphQL ✅ TestContainers and Cucumber ✅ CI/CD: GitLab CI ✅ Open AI API Key Qualifications: ⭐ Expert understanding of Java and Python technologies ⭐ Understand needs of company of any scale ⭐ Development of software, mobile apps, web apps ⭐ High-performance, maintainable and reusable code ⭐ 7+ years of experience ⭐ Self-starter, hard worker, organized, attentive to details and a team player ⭐ Good communication skills
Kotlin
JavaSpring BootDockerKubernetesMongoDBElasticsearchSpring CloudCloud ArchitectureAWS Cloud9Spring SecurityRabbitMQPostgreSQLAPI IntegrationAPIHTML5HTMLCSSAngularJSNode.jsReactJavaScript - $50 hourly
- 5.0/5
- (1 job)
Detail-oriented, creative and quickly trained employee. Works at fast pace to meet tight deadlines. Enthusiastic team player ready to contribute to company success. Hardworking and passionate job seeker with strong organizational skills, willing to take on added responsibilities to meet company goals.
Kotlin
PythonGolangReactVue.jsPresentation DesignPodcast ProductionVideo Editing & ProductionSocial Media MarketingCopywriting - $25 hourly
- 5.0/5
- (2 jobs)
Hey, I'm Kincső. In a nutshell 🥜 → Web Developer and Software Engineer More ↓ For me the communication and loyalty are important. Furthermore giving the best is essential. I have experience mainly in Web Development, Frontend but I had smaller projects in the following areas: ○ Mobile development ○ Database development ○ Backend development ○ OO development Skills and capabilities: ✅ HTML, CSS ✅ React, JavaScript ✅ Angular, TypeScript ✅ Material UI, Bootstrap ✅ Kotlin, Java, SpringBoot ✅ SQL, NoSQL (MongoDB, PostgreSQL) ✅ C#, .NET ✅ C++, C Have a nice day and Contact Me ✉️
Kotlin
.NET CoreC++C#Front-End DevelopmentNoSQL DatabaseSQLJavaBootstrapMaterial UIWeb DevelopmentTypeScriptAngularJavaScriptReact - $78 hourly
- 0.0/5
- (0 jobs)
I transform complex technical challenges into elegant digital experiences, I craft digital solutions that captivate and perform. My expertise flows from robust Java/Kotlin backends to stunning React/Next.js frontends, enriched with fluid GSAP animations. My journey from family businesses through multinational corporations to entrepreneurship has taught me a rare blend of technical mastery and business acumen. My passion for clear communication transforms client relationships into collaborative journeys, making complex development processes feel effortless and enjoyable. It's not just about writing code – it's about crafting solutions that resonate with both users and business objectives.
Kotlin
API DevelopmentGitJiraGradleJavaGSAPNext.jsReactMongoDBProduct DevelopmentWeb Development - $40 hourly
- 0.0/5
- (0 jobs)
Social network Applying for Backend Software Developer Main Languages: Java/Kotlin Key skills and competencies Java Kotlin Git Intellij IDEA Gradle Maven Jenkins TDD Works both independently as well as part of a team. Strong problem solving and analytical skills to develop creative solutions. Dedicated to learning better ways to write clean and efficient code. I can quite quickly figure out new frameworks and tech stack. Studying at the Moscow Institute of Physics and Technology gave me deep base knowledge in mathematics and programming.
Kotlin
JavaSoftware QADesktop Application - $15 hourly
- 5.0/5
- (6 jobs)
I am a software developer with experience in different fields as Web Development and Backend Development. I can help you create your website/webshop or maintain your back-end primarily in Springboot framework with a fair cost. Also developing and maintaining Wordpress websites/webshops from scratch.
Kotlin
PHPJavaScriptAPISpring BootWordPressJavaObject-Oriented ProgrammingJSONRESTful ArchitectureXMLAdobe Photoshop - $15 hourly
- 0.0/5
- (1 job)
I am a motivated software engineer who consistently stays focused on trends and rapidly evolving modern technologies in software engineering. I am always eager to learn and improve, possessing a solid background in implementing, refactoring, and migrating complex enterprise projects. Throughout my experience, I have successfully implemented numerous microservices and applications using modern architecture standards and design patterns. Let's find an efficient solultion for your project together!
Kotlin
Full-Stack DevelopmentDockerKubernetesCI/CDWeb DevelopmentSpring BootJava - $30 hourly
- 0.0/5
- (0 jobs)
I’m a Mobile Software Engineer with a strong Android background, React Native experience, and a solid foundation in QA automation. I build high-quality apps and SDKs, backed by robust testing and CI/CD workflows. What I can help you with: • Android (Java/Kotlin, MVVM, Jetpack, Firebase) • React Native cross-platform apps • Mobile test automation (Appium, Espresso, JUnit) • CI/CD and release management • Bug fixing, code reviews, and Agile teamwork
Kotlin
React NativeiOS DevelopmentSeleniumAutomated TestingJavaMobile AppQuality AssuranceAndroid App DevelopmentSoftware QA - $30 hourly
- 4.4/5
- (7 jobs)
Dynamic and adaptable full-stack software developer with 12+ years of experience building scalable web and mobile applications. Skilled in Ruby/Rails, JavaScript frameworks, and cloud platforms like AWS and GCP. Known for crafting clean, efficient code, optimizing processes, and driving innovative solutions across agile teams. Passionate about creating impactful software that makes a difference. I look forward to working with you! 💻 Backend: Ruby/Rails, Node.js (Express), GraphQL (API design) 💥 Frontend: React, Hotwire, Tailwind/Bootstrap, MUI, AntD, some Vue 🗄 Databases: PostgreSQL, MySQL, Redis, DynamoDB ☁️ Cloud & DevOps: AWS, GCP, Heroku, Terraform, CI/CD (CircleCI, GitHub Actions) ⚡ Specialties: RESTful API Development, Typescript ❤️ 📡 APIs: Stripe, Shift4, Clover Connect, Rapyd, Hokodo, Odoo, Mailchimp
Kotlin
Google App EngineVue.jsRuby on RailsRackspace Cloud ServersiOS DevelopmentAndroid App DevelopmentGraphQLAngularJSReactTypeScriptJavaObjective-CSwiftReact Native - $15 hourly
- 0.0/5
- (1 job)
6+ Years Building Scalable Solutions | Python, React, AWS, OpenAI I help businesses automate workflows and integrate AI agents into their apps, saving hundreds of hours in manual tasks. With 6 years of full-stack development and 1 year specializing in AI/LLM systems, I deliver: ‣ AI-Powered Apps: Chatbots, data analysis pipelines, and custom LLM fine-tuning (GPT-4, Claude). ‣ End-to-End Development: From UI/React frontends to Python/Go backends and cloud deployments (AWS, Docker). ‣ Scalable Solutions: Built AI agents processing 10k+ daily requests with 99.9% uptime. Technical Expertise: ✅ AI/LLM Tools: OpenAI API, LangChain, Hugging Face, AutoGPT ✅ Languages: Python, JavaScript (React/Node), Go, SQL ✅ Infrastructure: AWS, Google Cloud, Docker, Heroku ✅ Automation: Zapier, Make.com, Bolt.new Recent Projects: 1. Customer Support AI Agent: Reduced response time by 70% using React + GPT-4 integrations. 2. Document Processing Pipeline: Automated 500+ daily PDF analyses with Python + LLAMA-2. 3. E-commerce Automation: Deployed a Shopify product-description generator (Next.js + OpenAI). Why Work With Me? ‣ Fast & Responsive: <10 min average reply time. ‣ Transparent Process: Daily updates + scalable code. Client-Centric Focus: "He streamlined our entire workflow in 2 weeks!" – Tech Startup CEO Let’s Automate Your Business! I’m currently accepting new projects. Message me to discuss how AI can solve your challenges. Key Tips: 1. Use Numbers: Metrics (e.g., "70% faster") add credibility. 2. Highlight Outcomes: Focus on how you save time/costs, not just tech specs. 3. Add a CTA: End with a clear invitation to message you. 4. Short Paragraphs: Avoid walls of text – use bullet points and emojis sparingly.
Kotlin
Data AnalysisGoogle SheetsDashboardMicrosoft ExcelExcel FormulaGitMachine Learning ModelDockerPostgreSQLNode.jsJavaScriptCSSHTMLWeb DevelopmentAndroid StudioDjangoSpring BootPythonJava - $5 hourly
- 0.0/5
- (0 jobs)
Hi! I'm a passionate and skilled web developer with a focus on backend development. With a strong understanding of server-side technologies, I specialize in building fast, secure, and scalable websites. I’m also proficient in creating landing pages, blogs, and e-commerce sites using WordPress and other tools. Whether it's handling complex backend logic or delivering responsive front-end experiences, I can bring your web projects to life.
Kotlin
Back-End Development.NET Framework.NET CoreASP.NETC#SQLAndroid App DevelopmentMobile GameWeb DevelopmentWeb Application - $5 hourly
- 0.0/5
- (0 jobs)
First year computer science student with 1 year of coding experience in html5,css and JavaScript Offering Web development and web design
Kotlin
Visual Studio Team ServicesCSSFigmaMiroNetBeansGame UI/UX DesignWeb DevelopmentHTML5Mobile App DevelopmentAndroid StudioJavaScriptCSS 3 Want to browse more freelancers?
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