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Karen A.

Prague, Czech Republic

$60/hr
4.9
33 jobs

I help businesses and startups build scalable web platforms, AI automations, and custom software systems. Over the past few years, I’ve worked on SaaS platforms, Telegram Mini Apps, automation systems, dashboards, business tools, and AI-powered solutions using technologies like React, TypeScript, FastAPI, Python, Node.js, and C#. I focus on building products that are: fast scalable visually polished easy to maintain business-oriented What I can help with: ✔ Full-stack SaaS development ✔ AI integrations & automation ✔ React / Next.js frontends ✔ FastAPI & Node.js backends ✔ Telegram Mini Apps ✔ Dashboards & internal tools ✔ API integrations ✔ Workflow automation systems ✔ Startup MVP development I care a lot about communication, clean architecture, and delivering production-ready solutions that businesses can actually use and grow with. If you’re looking for someone who can understand both the technical and business side of a project, feel free to reach out.

  • Python
  • .NET Framework
  • Desktop Application
  • C#
  • API
  • Unity
  • Telegram
  • Multithreaded Programming
  • AR & VR Development
  • Telegram API
  • Trading Automation
  • Trading Strategy
  • Bot Development
  • Cryptocurrency
  • Mobile Game
  • Online Multiplayer
Roman N.

Prague, Czech Republic

$40/hr
5.0
10 jobs

👋 Hi there! I’m an experienced Full-Stack Engineer / Senior Java Developer / Team Lead with over 10 years of hands-on experience building scalable web and mobile applications across multiple domains, including ✔️ Healthcare ✔️ FinTech, ✔️ SaaS, and more. Let`s move faster to your goals with my ready-to-go integrations: 🚀 AI: ChatGPT, Llama, Mistral, etc. - business flow acceleration & facilitation 🚀 Eleven Labs - voice recognition, voice-to-text AI 🚀 Stripe card transfers 🚀 ChatGPT AI - text, AI-generated images 🚀 Machine vision - AI for images 🚀 Zoom - voice and video calls My Specialization: ✅ Java experience 10 years: Widely utilizing recent Java features, including Lambdas, Stream APIs, DateTime APIs, and Functional Interfaces. ✅ Frontend: JavaScript, Node.js, TypeScript, Vue.js. ✅ AI integration, Computer vision, LLM training. ✅ Java EE: RESTful Services, SOAP Services, JPA, Hibernate, API Integration etc. ✅ Spring experience 10 years: Spring Core, Spring Boot, Spring Data, Spring Cloud, etc. ✅ Other "frameworks": Keycloak authorization, JHipster, Swagger, Liquibase, Axon, Vaadin ✅ SQL Databases experience over 10 years: PostgreSQL, MySQL, MariaDB, Oracle ✅ NoSQL Databases: MongoDB, Redis, Hazelcast ✅ Message Broker: Kafka and Zookeeper ✅ Firebase messaging ✅ Message Queues: ActiveMQ & RabbitMQ. ✅ ELK: logstash, elasticsearch, kibana ✅ Testing: JUnit, Spring Test, Mockito, Integration Test, Unit Test. ✅ Versioning: GIT, GitHub, BitBucket, GitLab etc ✅ DevOps: Jenkins, Docker, Kubernetes, CI/CD ✅ Hands-on design, development, implementation, and optimization of the application. ✅ Apply software engineering best practices incl. design review, code review, and refactoring. ✅ Experienced with the full Software development life cycle (SDLC) including gathering requirements, development (design, coding, debugging), testing & deployment I’m excited to contribute and help drive maximum impact for your project 🚀

  • Java
  • Spring Boot
  • Spring Framework
  • Web Development
  • API
  • SQL
  • MongoDB
  • Mobile App
  • Web Application
  • OAuth
  • Full-Stack Development
  • AI Implementation
  • ChatGPT
  • API Integration
  • JavaScript
Jakub S.

Cerveny Kostelec, Czech Republic

$50/hr
5.0
6 jobs

"I have always enjoyed supporting others with their projects while learning something new. Having had the privilege of working alongside great colleagues, I have accumulated a wealth of knowledge that I would like to use to help others and make their projects come to fruition. My personal motto is "Do the work that you can be proud of." I am excited at the prospect of assisting you in moving your project forward."

  • Java
  • Software Architecture & Design
  • Spring Boot
  • Python
  • C++
  • Kubernetes
  • Apache Kafka
  • Apache Flink
  • GitLab
  • GitHub
  • Relational Database
  • NoSQL Database
  • DevOps
  • Software Development
  • Rancher
  • Linux
Mikhail T.

Prague, Czech Republic

$90/hr
5.0
18 jobs

I am a java developer with more than 10 years of experience for whom key moments in work are high quality and punctuality. I'll try to help you implement your ideas in life and make your project successful! Very quick studying of new technologies, methods and approaches as well as excellent understanding of java-core and OOP principles have always been my strong suit. Key technologies which I use: J2EE, J2SE, JDBI , JPA (hibernate), liquibase, EJB, REST (dropwizard framework), JaxWS, GWT, angular to name but a few. I would be glad to learn new technologies which are used in your projects. Databases: MySql, PostgreSQL, Oracle, Mongo IDE: IntelliJ IDEA mainly, Eclipse Build: Maven, Ant, Hudson, Jenkins, Bamboo

  • Java
  • PostgreSQL
  • Java Servlet API
  • AngularJS
  • J2SE
  • Multithreaded Programming
  • J2EE
  • SQL
  • Jakarta Server Pages
  • Core Java
Swapnil G.

Prague, Czech Republic

$20/hr
5.0
22 jobs

I am a passionate QA Automation Engineer, having 7+ years of experience. I am expert in Selenium, , Cypress, Robot framework,requests, Python. I have experience of Web, API, Mobile and Desktop application test automation. I can write test cases, create automation frameworks from scratch, integrate test execution with CI/CD tools. I have tested applications of Health domain, Finance domain, ERP, CRM applications, Hi-Tech applications, eCommerce applications and EdTech applications. I am cloud enabled, knows docker, kubernetes and public clouds like AWS, GCP, Azure and hybrid cloud OpenStack. I have strong computer science fundamentals. So no worries. Leave your QA, test automation responsibility to me. Automation Testing: 1. Automarion of API tests, Integration tests using Python, PyTest, Java, Junit, TestNG 2. Test Automation of Web UI, API, Mobile App UI using Selenium, Appium, Cypress 3. Creating custom test automation frameworks from scratch, fixing issues in existing frameworks 4. Writing load/performance testing scripts in Python, Shell 5. Penetration test scans for docker containers, virtual machines, idenifiying vulnerabilities Manual QA: 1. Test planning, test strategy, writing test cases, test scenarios 2. End to end functionality testing, web UI, Mobile apps testing 5. API Testing, Backend Testing, Database Testing using Postman, SoapUI 6. Performance testing and benchmarking using JMeter, LoadRunner 7. Security testing, Penetration Testing using Nessus, Burp Suite, Nmap 8. Cloud based, microservices, containerized application testing Tools Technologies I have experience with: 1. Selenium Webdriver, Cypress 2. Java Junit, TestNG, Python PyTest 3. Java, Python, 4. Jira for bug lifecylce tracking 5. Testlink for test case management 6. Postman, SoapUI for API Testing 7. JMeter, LoadRunner for Load testing 8. Shell, Ubuntu, Centos and RedHat 9. Jenkins for CI/CD, Ant, Maven, Docker for build

  • Cypress
  • API Testing
  • Manual Testing
  • Test Development
  • Test Case Design
  • Test Automation
  • Kubernetes
  • Postman
  • Selenium WebDriver
  • TestRail
  • Swagger
  • Tricentis
Illia P.

Prague, Czech Republic

$20/hr
5.0
4 jobs

Hello there 👋 I'm a C# and Java developer with a strong foundation in building complex, interactive applications. With 3+ years of development experience, I specialize in creating custom tools, utilities, and high-performance software. My background in visual computing allows me to approach UI/UX and software logic with a unique, user-centric perspective. Technical Skills: Languages: C# (.NET), Java, Python Core Concepts: OOP, Multithreading, Data Structures, Algorithms. Development: Visual Studio, IntelliJ, Git Version Control. What I Offer: ✔️Custom Tool Development: Building internal tools to speed up your business processes. ✔️Software Engineering: Developing standalone applications with robust backend logic. ✔️Problem Solving: debugging complex systems and implementing feature requests efficiently. ✔️Visual Integration: (Optional) Able to integrate 3D libraries or advanced UI elements into standard applications.

  • Adobe Photoshop
  • Unity
  • Game Development
  • Game Design
  • 3D Art
  • Modeling
  • C#

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Cost to hire a Java Developer

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